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Impulse Coupler
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vernon.franklin(at)gmail.
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PostPosted: Mon Mar 13, 2017 7:28 am    Post subject: Impulse Coupler Reply with quote

I am having a hard time identifying the mag that has the impulse coupler.  On my Cherokee, I get a very distinct click when turning the prop over, it is very easy to identify.  But with this 540, I am not getting anything.  
It is a stock D4A5 with factory installed slicks purchased through Vans.  
Is there a chance that it shipped without a coupler?  If so, is that going to be an issue, and should I purchase one?  Do I still ground out the right mag on startup in such a scenario?
Thanks in advance!
--
Vernon Franklin


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gengrumpy



Joined: 07 May 2013
Posts: 112
Location: Tullahoma, TN

PostPosted: Mon Mar 13, 2017 7:36 am    Post subject: Impulse Coupler Reply with quote

It should be on your left mag, and you should be able to hear it by pulling the prop through (with a plug out on each cylinder to make it easier to pull through).

Make sure your mag switch is OFF!

Quote:
On Mar 13, 2017, at 10:27 AM, Vernon Franklin <vernon.franklin(at)gmail.com> wrote:

I am having a hard time identifying the mag that has the impulse coupler. On my Cherokee, I get a very distinct click when turning the prop over, it is very easy to identify. But with this 540, I am not getting anything.

It is a stock D4A5 with factory installed slicks purchased through Vans.
Is there a chance that it shipped without a coupler? If so, is that going to be an issue, and should I purchase one? Do I still ground out the right mag on startup in such a scenario?

Thanks in advance!


--
Vernon Franklin


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Lenny Iszak



Joined: 23 Mar 2008
Posts: 224

PostPosted: Mon Mar 13, 2017 7:46 am    Post subject: Re: Impulse Coupler Reply with quote

Vernon,

Mine shipped with a retard breaker mag on the left. You'll need a Slick Start module for starting, and wire using their diagrams.


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PostPosted: Mon Mar 13, 2017 7:55 am    Post subject: Impulse Coupler Reply with quote

The mag with impulse coupler will have a spacer between the accessory case and the mag. Yes you need to ground out the non impulse mag for starting.


Gary

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From: owner-rv10-list-server(at)matronics.com <owner-rv10-list-server(at)matronics.com> on behalf of Vernon Franklin <vernon.franklin(at)gmail.com>
Sent: Monday, March 13, 2017 11:27:46 AM
To: rv10-list(at)matronics.com
Subject: Impulse Coupler

I am having a hard time identifying the mag that has the impulse coupler. On my Cherokee, I get a very distinct click when turning the prop over, it is very easy to identify. But with this 540, I am not getting anything.


It is a stock D4A5 with factory installed slicks purchased through Vans.
Is there a chance that it shipped without a coupler? If so, is that going to be an issue, and should I purchase one? Do I still ground out the right mag on startup in such a scenario?


Thanks in advance!


--
Vernon Franklin


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jesse(at)saintaviation.co
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PostPosted: Mon Mar 13, 2017 8:05 am    Post subject: Impulse Coupler Reply with quote

The stock engine from Van’s does not have an impulse coupled mag. The left is a retard breaker mag. You need a slick start. Yes, you need to ground the right mag during start with the Slick Start.

Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com
C: 352-427-0285
F: 815-377-3694

Quote:
On Mar 13, 2017, at 11:27 AM, Vernon Franklin <vernon.franklin(at)gmail.com> wrote:

I am having a hard time identifying the mag that has the impulse coupler. On my Cherokee, I get a very distinct click when turning the prop over, it is very easy to identify. But with this 540, I am not getting anything.

It is a stock D4A5 with factory installed slicks purchased through Vans.
Is there a chance that it shipped without a coupler? If so, is that going to be an issue, and should I purchase one? Do I still ground out the right mag on startup in such a scenario?

Thanks in advance!


--
Vernon Franklin


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Lenny Iszak



Joined: 23 Mar 2008
Posts: 224

PostPosted: Mon Mar 13, 2017 8:18 am    Post subject: Re: Impulse Coupler Reply with quote

According to this document from Lycoming, there are no approved impulse mags for the D4A5.

https://www.lycoming.com/sites/default/files/SI1443L%20Approved%20Slick%20Magnetos.pdf
vernon.franklin(at)gmail. wrote:
I am having a hard time identifying the mag that has the impulse coupler.  On my Cherokee, I get a very distinct click when turning the prop over, it is very easy to identify.  But with this 540, I am not getting anything.  
It is a stock D4A5 with factory installed slicks purchased through Vans.  
Is there a chance that it shipped without a coupler?  If so, is that going to be an issue, and should I purchase one?  Do I still ground out the right mag on startup in such a scenario?
Thanks in advance!
--
Vernon Franklin


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2014 RV-10, N311LZ - 300 hrs
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Kellym



Joined: 10 Jan 2006
Posts: 1428
Location: Sun Lakes AZ

PostPosted: Mon Mar 13, 2017 8:24 am    Post subject: Impulse Coupler Reply with quote

Could investigate swap of your Slick mags for overhauled Bendix S-1200
mags with impulse coupling. Makes it a D4B5 with much better high
altitude performance. The S-1200 are the best mags ever made. My
rebuilder offered me new Slick or overhauled S-6 or S-1200 mags all at
same price. I took the 1200s. A little tight fit with oil breather tube,
otherwise fine.

On 3/13/2017 9:18 AM, Lenny Iszak wrote:
Quote:


According to this document from Lycoming, there are no approved impulse mags for the D4A5.

https://www.lycoming.com/sites/default/files/SI1443L%20Approved%20Slick%20Magnetos.pdf

vernon.franklin(at)gmail. wrote:
> I am having a hard time identifying the mag that has the impulse coupler. On my Cherokee, I get a very distinct click when turning the prop over, it is very easy to identify. But with this 540, I am not getting anything.
> It is a stock D4A5 with factory installed slicks purchased through Vans.
> Is there a chance that it shipped without a coupler? If so, is that going to be an issue, and should I purchase one? Do I still ground out the right mag on startup in such a scenario?
> Thanks in advance!
> --
> Vernon Franklin
--------
Lenny
N311LZ


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=467242#467242



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PostPosted: Mon Mar 13, 2017 8:34 am    Post subject: Impulse Coupler Reply with quote

Put a Shower of Sparks on it. Easy to do and starts much better than impulse coupled anyway anytime.

Sent from my iPhone

Quote:
On Mar 13, 2017, at 11:28 AM, Kelly McMullen <kellym(at)aviating.com> wrote:



Could investigate swap of your Slick mags for overhauled Bendix S-1200 mags with impulse coupling. Makes it a D4B5 with much better high altitude performance. The S-1200 are the best mags ever made. My rebuilder offered me new Slick or overhauled S-6 or S-1200 mags all at same price. I took the 1200s. A little tight fit with oil breather tube, otherwise fine.

> On 3/13/2017 9:18 AM, Lenny Iszak wrote:
>
>
> According to this document from Lycoming, there are no approved impulse mags for the D4A5.
>
> https://www.lycoming.com/sites/default/files/SI1443L%20Approved%20Slick%20Magnetos.pdf
>
>
>
> vernon.franklin(at)gmail. wrote:
>> I am having a hard time identifying the mag that has the impulse coupler. On my Cherokee, I get a very distinct click when turning the prop over, it is very easy to identify. But with this 540, I am not getting anything. Â
>>
>>
>> It is a stock D4A5 with factory installed slicks purchased through Vans. Â
>> Is there a chance that it shipped without a coupler? If so, is that going to be an issue, and should I purchase one? Do I still ground out the right mag on startup in such a scenario?
>>
>>
>> Thanks in advance!
>>
>>
>> --
>> Vernon Franklin
>
>
> --------
> Lenny
> N311LZ
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=467242#467242
>
>
>
>
>
>
>
>
>





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Tim Olson



Joined: 25 Jan 2007
Posts: 2664

PostPosted: Mon Mar 13, 2017 8:43 am    Post subject: Impulse Coupler Reply with quote

Or better yet put on electronic ignition...
Quote:
On Mar 13, 2017, at 11:33 AM, Danny Riggs <jdriggs49(at)MSN.COM> wrote:



Put a Shower of Sparks on it. Easy to do and starts much better than impulse coupled anyway anytime.

Sent from my iPhone

> On Mar 13, 2017, at 11:28 AM, Kelly McMullen <kellym(at)aviating.com> wrote:
>
>
>
> Could investigate swap of your Slick mags for overhauled Bendix S-1200 mags with impulse coupling. Makes it a D4B5 with much better high altitude performance. The S-1200 are the best mags ever made. My rebuilder offered me new Slick or overhauled S-6 or S-1200 mags all at same price. I took the 1200s. A little tight fit with oil breather tube, otherwise fine.
>
>> On 3/13/2017 9:18 AM, Lenny Iszak wrote:
>>
>>
>> According to this document from Lycoming, there are no approved impulse mags for the D4A5.
>>
>> https://www.lycoming.com/sites/default/files/SI1443L%20Approved%20Slick%20Magnetos.pdf
>>
>>
>>
>> vernon.franklin(at)gmail. wrote:
>>> I am having a hard time identifying the mag that has the impulse coupler. On my Cherokee, I get a very distinct click when turning the prop over, it is very easy to identify. But with this 540, I am not getting anything. Â
>>>
>>>
>>> It is a stock D4A5 with factory installed slicks purchased through Vans. Â
>>> Is there a chance that it shipped without a coupler? If so, is that going to be an issue, and should I purchase one? Do I still ground out the right mag on startup in such a scenario?
>>>
>>>
>>> Thanks in advance!
>>>
>>>
>>> --
>>> Vernon Franklin
>>
>>
>> --------
>> Lenny
>> N311LZ
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=467242#467242
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>






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Lenny Iszak



Joined: 23 Mar 2008
Posts: 224

PostPosted: Mon Mar 13, 2017 9:16 am    Post subject: Re: Impulse Coupler Reply with quote

Yep, when you consider the cost of the SlickStart and the money you get selling the brand new mag with the harness, the EI upgrade is practically free.

After a few a couple of different ignition setups I ended up with the retard mag and a Lightspeed Plasma. I'm starting on the Lightspeed only and grounding out the retard mag. Starts like a car when cold, a bit finicky when hot, but i'm embarrassing myself less and less lately with my hot starts Smile

Tim Olson wrote:
Or better yet put on electronic ignition...


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gengrumpy



Joined: 07 May 2013
Posts: 112
Location: Tullahoma, TN

PostPosted: Mon Mar 13, 2017 1:49 pm    Post subject: Impulse Coupler Reply with quote

No true. I have one on the left mag. Installed 10yrs ago when Aerosport Power built my engine.

grumpy

do not archive

Quote:
On Mar 13, 2017, at 11:18 AM, Lenny Iszak <lenard(at)rapiddecision.com> wrote:



According to this document from Lycoming, there are no approved impulse mags for the D4A5.

https://www.lycoming.com/sites/default/files/SI1443L%20Approved%20Slick%20Magnetos.pdf



vernon.franklin(at)gmail. wrote:
> I am having a hard time identifying the mag that has the impulse coupler. On my Cherokee, I get a very distinct click when turning the prop over, it is very easy to identify. But with this 540, I am not getting anything. Â
>
>
> It is a stock D4A5 with factory installed slicks purchased through Vans. Â
> Is there a chance that it shipped without a coupler? If so, is that going to be an issue, and should I purchase one? Do I still ground out the right mag on startup in such a scenario?
>
>
> Thanks in advance!
>
>
> --
> Vernon Franklin


--------
Lenny
N311LZ




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=467242#467242











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Bob Turner



Joined: 03 Jan 2009
Posts: 783
Location: Castro Valley, CA

PostPosted: Mon Mar 13, 2017 3:31 pm    Post subject: Re: Impulse Coupler Reply with quote

I'm not sure if "approved" (implying anything else is "disapproved") is the right word here. However, for the last 6 or 7 years Lycoming will not ship this engine with Slick impulse mags, and that's where Vans gets theirs from. I think this was in response to some SB or AD requiring frequent inspections of impulse couplings.

Certainly, at least for a while, Vans' order form was a bit mis-leading, listing the Slick start as "an option". It really is pretty much required, unless, as others have said, you're going to ditch one or both mags for an electronic system.


gengrumpy wrote:
No true. I have one on the left mag. Installed 10yrs ago when Aerosport Power built my engine.

grumpy

do not archive

Quote:
On Mar 13, 2017, at 11:18 AM, Lenny Iszak <lenard> wrote:



According to this document from Lycoming, there are no approved impulse mags for the D4A5.

https://www.lycoming.com/sites/default/files/SI1443L%20Approved%20Slick%20Magnetos.pdf



vernon.franklin(at)gmail. wrote:
> I am having a hard time identifying the mag that has the impulse coupler. On my Cherokee, I get a very distinct click when turning the prop over, it is very easy to identify. But with this 540, I am not getting anything. Â
>
>
> It is a stock D4A5 with factory installed slicks purchased through Vans. Â
> Is there a chance that it shipped without a coupler? If so, is that going to be an issue, and should I purchase one? Do I still ground out the right mag on startup in such a scenario?
>
>
> Thanks in advance!
>
>
> --
> Vernon Franklin


--------
Lenny
N311LZ




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=467242#467242












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duawil



Joined: 25 May 2006
Posts: 10

PostPosted: Mon Mar 13, 2017 3:44 pm    Post subject: Impulse Coupler Reply with quote

I don’t understand the “required” part of this discussion. I have a “Van’s” new experimental Lycoming D4A5 without the Slick start option and I have never had any trouble starting. What am I missing?
Quote:
On Mar 13, 2017, at 4:31 PM, Bob Turner <bobturner(at)alum.rpi.edu> wrote:



I'm not sure if "approved" (implying anything else is "disapproved") is the right word here. However, for the last 6 or 7 years Lycoming will not ship this engine with Slick impulse mags, and that's where Vans gets theirs from. I think this was in response to some SB or AD requiring frequent inspections of impulse couplings.

Certainly, at least for a while, Vans' order form was a bit mis-leading, listing the Slick start as "an option". It really is pretty much required, unless, as others have said, you're going to ditch one or both mags for an electronic system.





gengrumpy wrote:
> No true. I have one on the left mag. Installed 10yrs ago when Aerosport Power built my engine.
>
> grumpy
>
> do not archive
>
>
>> On Mar 13, 2017, at 11:18 AM, Lenny Iszak wrote:
>>
>>
>>
>> According to this document from Lycoming, there are no approved impulse mags for the D4A5.
>>
>> https://www.lycoming.com/sites/default/files/SI1443L%20Approved%20Slick%20Magnetos.pdf
>>
>>
>>
>> vernon.franklin(at)gmail. wrote:
>>> I am having a hard time identifying the mag that has the impulse coupler. On my Cherokee, I get a very distinct click when turning the prop over, it is very easy to identify. But with this 540, I am not getting anything. Â
>>>
>>>
>>> It is a stock D4A5 with factory installed slicks purchased through Vans. Â
>>> Is there a chance that it shipped without a coupler? If so, is that going to be an issue, and should I purchase one? Do I still ground out the right mag on startup in such a scenario?
>>>
>>>
>>> Thanks in advance!
>>>
>>>
>>> --
>>> Vernon Franklin
>>
>>
>> --------
>> Lenny
>> N311LZ
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=467242#467242
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>


--------
Bob Turner
RV-10 QB




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http://forums.matronics.com/viewtopic.php?p=467265#467265











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Bob Turner



Joined: 03 Jan 2009
Posts: 783
Location: Castro Valley, CA

PostPosted: Mon Mar 13, 2017 4:21 pm    Post subject: Re: Impulse Coupler Reply with quote

Most of the new starters really spin the engine with a good battery - enough to generate a spark from the mag without the need of any augmentation. See if you can find an old battery - one that barely spins the engine. And add in some worn plugs, with gaps at their maximums instead of minimums. Does it still start?
Here's the real test: For safety, pull all the plugs. Hook up plug#1 to the harness, and lay it on top of a cylinder where it has a good ground. Now slowly turn the prop past TDC on #1. If you had an impulse mag you'd see it spark. With no "slick start" you won't. Now repeat, but turn the prop faster and faster until you see a spark. That's the minimum RPM you'll need to start the engine.
You'd probably find it hard to hand-prop this engine. But maybe that's a good thing?
duawil wrote:
I don’t understand the “required” part of this discussion. I have a “Van’s” new experimental Lycoming D4A5 without the Slick start option and I have never had any trouble starting. What am I missing?
Quote:
On Mar 13, 2017, at 4:31 PM, Bob Turner <bobturner> wrote:



I'm not sure if "approved" (implying anything else is "disapproved") is the right word here. However, for the last 6 or 7 years Lycoming will not ship this engine with Slick impulse mags, and that's where Vans gets theirs from. I think this was in response to some SB or AD requiring frequent inspections of impulse couplings.

Certainly, at least for a while, Vans' order form was a bit mis-leading, listing the Slick start as "an option". It really is pretty much required, unless, as others have said, you're going to ditch one or both mags for an electronic system.





gengrumpy wrote:
> No true. I have one on the left mag. Installed 10yrs ago when Aerosport Power built my engine.
>
> grumpy
>
> do not archive
>
>
>> On Mar 13, 2017, at 11:18 AM, Lenny Iszak wrote:
>>
>>
>>
>> According to this document from Lycoming, there are no approved impulse mags for the D4A5.
>>
>> https://www.lycoming.com/sites/default/files/SI1443L%20Approved%20Slick%20Magnetos.pdf
>>
>>
>>
>> vernon.franklin(at)gmail. wrote:
>>> I am having a hard time identifying the mag that has the impulse coupler. On my Cherokee, I get a very distinct click when turning the prop over, it is very easy to identify. But with this 540, I am not getting anything. Â
>>>
>>>
>>> It is a stock D4A5 with factory installed slicks purchased through Vans. Â
>>> Is there a chance that it shipped without a coupler? If so, is that going to be an issue, and should I purchase one? Do I still ground out the right mag on startup in such a scenario?
>>>
>>>
>>> Thanks in advance!
>>>
>>>
>>> --
>>> Vernon Franklin
>>
>>
>> --------
>> Lenny
>> N311LZ
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=467242#467242
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>


--------
Bob Turner
RV-10 QB




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http://forums.matronics.com/viewtopic.php?p=467265#467265












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PostPosted: Mon Mar 13, 2017 4:31 pm    Post subject: Impulse Coupler Reply with quote

I purchased in 2013 engine from Lycoming Thunderbolt and they provided
Slicks

--


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Kellym



Joined: 10 Jan 2006
Posts: 1428
Location: Sun Lakes AZ

PostPosted: Mon Mar 13, 2017 5:02 pm    Post subject: Impulse Coupler Reply with quote

It isn't the brand, it is the specific model number of the mag whether
it has impulse coupling or not. If it has a properly working impluse,
you can't miss the snap when it releases. If it doesn't have it, the
engine will be difficult to start on stock 25 degree timing instead of TDC.

On 3/13/2017 5:27 PM, gulf wrote:
[quote]

I purchased in 2013 engine from Lycoming Thunderbolt and they provided
Slicks

--


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PostPosted: Mon Mar 13, 2017 5:03 pm    Post subject: Impulse Coupler Reply with quote

Approved, no. Installed, yes. Aerosport, Mattituck and probably others installed impulse coupled mags, but never Van's.

Jesse Saint
Saint Aviation, Inc.
352-427-0285
jesse(at)saintaviation.com

Sent from my iPad

Quote:
On Mar 13, 2017, at 5:49 PM, John Miller <gengrumpy(at)aol.com> wrote:



No true. I have one on the left mag. Installed 10yrs ago when Aerosport Power built my engine.

grumpy

do not archive

> On Mar 13, 2017, at 11:18 AM, Lenny Iszak <lenard(at)rapiddecision.com> wrote:
>
>
>
> According to this document from Lycoming, there are no approved impulse mags for the D4A5.
>
> https://www.lycoming.com/sites/default/files/SI1443L%20Approved%20Slick%20Magnetos.pdf
>
>
>
> vernon.franklin(at)gmail. wrote:
>> I am having a hard time identifying the mag that has the impulse coupler. On my Cherokee, I get a very distinct click when turning the prop over, it is very easy to identify. But with this 540, I am not getting anything. Â
>>
>>
>> It is a stock D4A5 with factory installed slicks purchased through Vans. Â
>> Is there a chance that it shipped without a coupler? If so, is that going to be an issue, and should I purchase one? Do I still ground out the right mag on startup in such a scenario?
>>
>>
>> Thanks in advance!
>>
>>
>> --
>> Vernon Franklin
>
>
> --------
> Lenny
> N311LZ
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=467242#467242
>
>
>
>
>
>
>
>
>







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jesse(at)saintaviation.co
Guest





PostPosted: Mon Mar 13, 2017 5:08 pm    Post subject: Impulse Coupler Reply with quote

We had an RV-10 that started and ran fine for a year or two without a Slick Start. Then, I taxied to the pumps once and it wouldn't start after I pumped gas. I waited for an hour and it fired right up (after charging the battery back up). This happened a number of times before we could get the Slick Start installed. Never a problem again. If only cold starting with a good battery, not a problem. Hot starting without Slick Start is virtually impossible. The owner of his one never did a hot start. He flew somewhere and had a meeting for a while before trying to start again. He always had it fueled at his hangar by the fuel truck. It wasn't until that time I taxied to the pumps that I realized there wasn't an impulse coupling.

The main danger of no Slick Start is probably a kickback by firing at base timing instead of TDC, which the retard breaker does through the Slick Start. That's also why normal mags are grounded during start with the R mag ground jumper on a standard key switch. Not really common, but can happen.

Jesse Saint
Saint Aviation, Inc.
352-427-0285
jesse(at)saintaviation.com

Sent from my iPad

Quote:
On Mar 13, 2017, at 8:21 PM, Bob Turner <bobturner(at)alum.rpi.edu> wrote:



Most of the new starters really spin the engine with a good battery - enough to generate a spark from the mag without the need of any augmentation. See if you can find an old battery - one that barely spins the engine. And add in some worn plugs, with gaps at their maximums instead of minimums. Does it still start?
Here's the real test: For safety, pull all the plugs. Hook up plug#1 to the harness, and lay it on top of a cylinder where it has a good ground. Now slowly turn the prop past TDC on #1. If you had an impulse mag you'd see it spark. With no "slick start" you won't. Now repeat, but turn the prop faster and faster until you see a spark. That's the minimum RPM you'll need to start the engine.
You'd probably find it hard to hand-prop this engine. But maybe that's a good thing?



duawil wrote:
> I don’t understand the “required” part of this discussion. I have a “Van’s” new experimental Lycoming D4A5 without the Slick start option and I have never had any trouble starting. What am I missing?
>
>
>
>> On Mar 13, 2017, at 4:31 PM, Bob Turner wrote:
>>
>>
>>
>> I'm not sure if "approved" (implying anything else is "disapproved") is the right word here. However, for the last 6 or 7 years Lycoming will not ship this engine with Slick impulse mags, and that's where Vans gets theirs from. I think this was in response to some SB or AD requiring frequent inspections of impulse couplings.
>>
>> Certainly, at least for a while, Vans' order form was a bit mis-leading, listing the Slick start as "an option". It really is pretty much required, unless, as others have said, you're going to ditch one or both mags for an electronic system.
>>
>>
>>
>>
>>
>> gengrumpy wrote:
>>> No true. I have one on the left mag. Installed 10yrs ago when Aerosport Power built my engine.
>>>
>>> grumpy
>>>
>>> do not archive
>>>
>>>
>>>> On Mar 13, 2017, at 11:18 AM, Lenny Iszak wrote:
>>>>
>>>>
>>>>
>>>> According to this document from Lycoming, there are no approved impulse mags for the D4A5.
>>>>
>>>> https://www.lycoming.com/sites/default/files/SI1443L%20Approved%20Slick%20Magnetos.pdf
>>>>
>>>>
>>>>
>>>> vernon.franklin(at)gmail. wrote:
>>>>> I am having a hard time identifying the mag that has the impulse coupler. On my Cherokee, I get a very distinct click when turning the prop over, it is very easy to identify. But with this 540, I am not getting anything. Â
>>>>>
>>>>>
>>>>> It is a stock D4A5 with factory installed slicks purchased through Vans. Â
>>>>> Is there a chance that it shipped without a coupler? If so, is that going to be an issue, and should I purchase one? Do I still ground out the right mag on startup in such a scenario?
>>>>>
>>>>>
>>>>> Thanks in advance!
>>>>>
>>>>>
>>>>> --
>>>>> Vernon Franklin
>>>>
>>>>
>>>> --------
>>>> Lenny
>>>> N311LZ
>>>>
>>>>
>>>>
>>>>
>>>> Read this topic online here:
>>>>
>>>> http://forums.matronics.com/viewtopic.php?p=467242#467242
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>
>>
>> --------
>> Bob Turner
>> RV-10 QB
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=467265#467265
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>


--------
Bob Turner
RV-10 QB




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=467267#467267











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flysrv10(at)gmail.com
Guest





PostPosted: Mon Mar 13, 2017 5:34 pm    Post subject: Impulse Coupler Reply with quote

I had the same set up. After a while, it gets harder and harder to start. In fact it nearly refused to start one day and that is how I realized I did not have an impulse coupled mag. Put a shower of sparks and all is good.

Do not archive.

Sent from my iPhone

Quote:
On Mar 13, 2017, at 7:43 PM, Duane Wilson <aaa(at)pacifier.com> wrote:



I don’t understand the “required” part of this discussion. I have a “Van’s” new experimental Lycoming D4A5 without the Slick start option and I have never had any trouble starting. What am I missing?


> On Mar 13, 2017, at 4:31 PM, Bob Turner <bobturner(at)alum.rpi.edu> wrote:
>
>
>
> I'm not sure if "approved" (implying anything else is "disapproved") is the right word here. However, for the last 6 or 7 years Lycoming will not ship this engine with Slick impulse mags, and that's where Vans gets theirs from. I think this was in response to some SB or AD requiring frequent inspections of impulse couplings.
>
> Certainly, at least for a while, Vans' order form was a bit mis-leading, listing the Slick start as "an option". It really is pretty much required, unless, as others have said, you're going to ditch one or both mags for an electronic system.
>
>
>
>
>
> gengrumpy wrote:
>> No true. I have one on the left mag. Installed 10yrs ago when Aerosport Power built my engine.
>>
>> grumpy
>>
>> do not archive
>>
>>
>>> On Mar 13, 2017, at 11:18 AM, Lenny Iszak wrote:
>>>
>>>
>>>
>>> According to this document from Lycoming, there are no approved impulse mags for the D4A5.
>>>
>>> https://www.lycoming.com/sites/default/files/SI1443L%20Approved%20Slick%20Magnetos.pdf
>>>
>>>
>>>
>>> vernon.franklin(at)gmail. wrote:
>>>> I am having a hard time identifying the mag that has the impulse coupler. On my Cherokee, I get a very distinct click when turning the prop over, it is very easy to identify. But with this 540, I am not getting anything. Â
>>>>
>>>>
>>>> It is a stock D4A5 with factory installed slicks purchased through Vans. Â
>>>> Is there a chance that it shipped without a coupler? If so, is that going to be an issue, and should I purchase one? Do I still ground out the right mag on startup in such a scenario?
>>>>
>>>>
>>>> Thanks in advance!
>>>>
>>>>
>>>> --
>>>> Vernon Franklin
>>>
>>>
>>> --------
>>> Lenny
>>> N311LZ
>>>
>>>
>>>
>>>
>>> Read this topic online here:
>>>
>>> http://forums.matronics.com/viewtopic.php?p=467242#467242
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>
>
> --------
> Bob Turner
> RV-10 QB
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=467265#467265
>
>
>
>
>
>
>
>
>







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dmasys



Joined: 10 Dec 2011
Posts: 18

PostPosted: Tue Mar 14, 2017 5:28 am    Post subject: Impulse Coupler Reply with quote

Same story on my -10. Flew it for about 400 hours without a Slick start and
without knowing I even needed one. Always started great cold, but became
increasingly hard to start hot, till I once had to just leave the plane
overnight at an outlying airport. No fun. The Slick start module plus
IRAN'd mags solved the problem, but interestingly the mags are just a bit
over 450 hrs since the last maintenance and it's getting increasingly hard
to start the bird when it's hot, again.

This time around on mag maintenance, am probably going to go with the
Surefly electronic mag replacement (https://www.surefly.net/ ), and am
tempted to replace the right (non-retard) mag and leave the left mag with
Slickstart, and wire it so both the electronic ignition and the retarded
timing mag are active at startup. Surefly fires at TDC below 400 rpm and
Slickstart retards to TDC and increases dwell when energized via starter
circuit, if I understand correctly.

Any reason not to have both mags firing at TDC at startup? Seems like it
would maximize the likelihood of at least one cylinder firing during hot
start operations.

-Dan Masys
N104LD 960 hrs TTSN

----------------------------

Time: 05:23:52 PM PST US
Subject: Re: Impulse Coupler
From: "Bob Turner" <bobturner(at)alum.rpi.edu>
Most of the new starters really spin the engine with a good battery - enough
to
generate a spark from the mag without the need of any augmentation. See if
you
can find an old battery - one that barely spins the engine. And add in some
worn plugs, with gaps at their maximums instead of minimums. Does it still
start?
Here's the real test: For safety, pull all the plugs. Hook up plug#1 to the
harness,
and lay it on top of a cylinder where it has a good ground. Now slowly turn
the prop past TDC on #1. If you had an impulse mag you'd see it spark. With
no "slick start" you won't. Now repeat, but turn the prop faster and faster
until you see a spark. That's the minimum RPM you'll need to start the
engine.
You'd probably find it hard to hand-prop this engine. But maybe that's a
good thing?
duawil wrote:
Quote:
I dont understand the required part of this discussion. I have a Vans new
experimental

Lycoming D4A5 without the Slick start option and I have never had any
trouble starting. What am I missing?
Quote:



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