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Engine timing

 
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philperry9



Joined: 23 Nov 2011
Posts: 330

PostPosted: Mon Oct 23, 2017 11:51 am    Post subject: Engine timing Reply with quote

Does anyone know of a website or YouTube video that discusses the effects of engine timing with piston changes.

IE: My lycoming (aerosport really) has 9:1 pistons and the data plate still shows stock 20° timing. I have one LSE and one mag. I’m considering tweaking my mag timing for the 9:1 pistons and see if I can smooth out the engine a bit more.

But before I do, I’d like to educate myself with reputable information.

Thanks,
Phil


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Kellym



Joined: 10 Jan 2006
Posts: 1464
Location: Sun Lakes AZ

PostPosted: Mon Oct 23, 2017 1:22 pm    Post subject: Engine timing Reply with quote

Phil, higher compression generally means faster burning of the fuel.
Thus later timing and higher octane.
I have stock 8.5:1 pistons and 25 degree timing. The highest compression
Lycoming used for non-helicopter applications was 8.7:1 and they had 20
degree timing, which is why I suspect Aerosport recommended that value.
A phone call to Aerosport should verify.
Once you are above a certain rpm the LSE will begin advancing timing,
depending on manifold pressure, rpm and CHT.
I would suspect either plugs or fuel injectors if engine isn't as smooth
as you think it should be. You should be able to verify by doing in
flight mag check to see if EGT rise on single mag is greater on any one
cylinder.

On 10/23/2017 12:50 PM, Phillip Perry wrote:
Quote:


Does anyone know of a website or YouTube video that discusses the effects of engine timing with piston changes.

IE: My lycoming (aerosport really) has 9:1 pistons and the data plate still shows stock 20° timing. I have one LSE and one mag. I’m considering tweaking my mag timing for the 9:1 pistons and see if I can smooth out the engine a bit more.

But before I do, I’d like to educate myself with reputable information.

Thanks,
Phil








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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD
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partner14



Joined: 12 Jan 2008
Posts: 517
Location: Granite Bay, California

PostPosted: Mon Oct 23, 2017 1:26 pm    Post subject: Engine timing Reply with quote

Although 9:1 isn't really that much higher compression, what I can tell you is that with an increase in timing, 25 degrees, you will have higher cht's.
Don McDonald
From: Phillip Perry <philperry9(at)gmail.com>
To: rv10-list(at)matronics.com
Sent: Monday, October 23, 2017 3:02 PM
Subject: Engine timing


--> RV10-List message posted by: Phillip Perry <philperry9(at)gmail.com (philperry9(at)gmail.com)>

Does anyone know of a website or YouTube video that discusses the effects of engine timing with piston changes.

IE: My lycoming (aerosport really) has 9:1 pistons and the data plate still shows stock 20° timing. I have one LSE and one mag. I’m considering tweaking my mag timing for the 9:1 pistons and see if I can smooth out the engine a bit more.

But before I do, I’d like to educate myself with reputable information.

Thanks,

Phil

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Don A. McDonald
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Kellym



Joined: 10 Jan 2006
Posts: 1464
Location: Sun Lakes AZ

PostPosted: Mon Oct 23, 2017 4:08 pm    Post subject: Engine timing Reply with quote

Yes, advancing timing would be the wrong way to go. Would run hotter and
have less detonation margin. If anything, it might take backing off to
perhaps 18 degrees.

On 10/23/2017 2:20 PM, Don McDonald wrote:
Quote:
Although 9:1 isn't really that much higher compression, what I can tell
you is that with an increase in timing, 25 degrees, you will have higher
cht's.
Don McDonald

------------------------------------------------------------------------
*From:* Phillip Perry <philperry9(at)gmail.com>
*To:* rv10-list(at)matronics.com
*Sent:* Monday, October 23, 2017 3:02 PM
*Subject:* Engine timing


<mailto:philperry9(at)gmail.com>>

Does anyone know of a website or YouTube video that discusses the
effects of engine timing with piston changes.

IE: My lycoming (aerosport really) has 9:1 pistons and the data plate
still shows stock 20° timing.  I have one LSE and one mag.  I’m
considering tweaking my mag timing for the 9:1 pistons and see if I can
smooth out the engine a bit more.

But before I do, I’d like to educate myself with reputable information.

Thanks,
Phil



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http://wiki.matronics.com
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Kelly McMullen
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KCHD
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Nick Leonard



Joined: 18 Jun 2007
Posts: 34
Location: Sacramento, CA

PostPosted: Mon Oct 23, 2017 5:03 pm    Post subject: Re: Engine timing Reply with quote

If you want to learn about how to properly run your engine (ROP, LOP, TIming, the Red Box, etc) check out the people at GAMI and their Advanced Pilot seminars. They have a weekend class that is amazing but most of the information is covered in their on-line seminar.

AdvancedPilot.com

It's well worth the price of admission if you truly want to know the facts (and fallacies) about managing EGT, CHT, timing, and electronic ignitions.

Highly recommended.

Nick


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Nick Leonard
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rjones560xl@gmail.com



Joined: 29 Jul 2015
Posts: 5
Location: Las Vegas, NV

PostPosted: Mon Oct 23, 2017 7:22 pm    Post subject: Engine timing Reply with quote

I am no expert on this issue, but the people that built my engine are and have been producing reliable high performance engines for years. Barrett Precision Engines built my engine with their own cold air induction system, 9-1 pistons, Airflow Performance FM300 throttle body, Superior bearings and cylinders. and Bendix mags. They dataplate they put on it specifies timing at 25 degrees before top dead center. It came in at 288hp on the dyno. I have no idea what the Lycoming Manual says about this, but then it is no longer a stock Lycoming

Robert Jones

Quote:
On Oct 23, 2017, at 17:06, Kelly McMullen <kellym(at)aviating.com> wrote:



Yes, advancing timing would be the wrong way to go. Would run hotter and have less detonation margin. If anything, it might take backing off to perhaps 18 degrees.

> On 10/23/2017 2:20 PM, Don McDonald wrote:
> Although 9:1 isn't really that much higher compression, what I can tell you is that with an increase in timing, 25 degrees, you will have higher cht's.
> Don McDonald
> ------------------------------------------------------------------------
> *From:* Phillip Perry <philperry9(at)gmail.com>
> *To:* rv10-list(at)matronics.com
> *Sent:* Monday, October 23, 2017 3:02 PM
> *Subject:* Engine timing
>
> Does anyone know of a website or YouTube video that discusses the effects of engine timing with piston changes.
> IE: My lycoming (aerosport really) has 9:1 pistons and the data plate still shows stock 20° timing. I have one LSE and one mag. I’m considering tweaking my mag timing for the 9:1 pistons and see if I can smooth out the engine a bit more.
> But before I do, I’d like to educate myself with reputable information.
> Thanks,
> Phil
> http://www.matronics.com/Navigator?RV10-List
> http://forums.matronics.com
> http://wiki.matronics.com
> http://www.matron===





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Robert J Jones
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