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Timing 0-360A1A

 
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n616tb(at)btsapps.com
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PostPosted: Sat Dec 22, 2007 12:37 pm    Post subject: Timing 0-360A1A Reply with quote

It appears the timing on my 0-360A1A is off some. Since the points are not
opening at the same time I need to make some adjustment. My flywheel has a
line on it for TDC as well as 25 degrees. Where should the mark for 25 be
aligned on this engine for timing? I had thought it was the split in the
case but apparently that may not be the true.

My right mag points are opening well before the left mag but the left mag
seems pretty well opening with the impulse coupler.

I don't have an engine service manual for this engine, thus I needed to ask.
Thanks
Tim


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n616tb(at)btsapps.com
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PostPosted: Sat Dec 22, 2007 1:26 pm    Post subject: Timing 0-360A1A Reply with quote

OK, following up on this question. The left mag points are opening up about
25 degrees later and coincide with the snap of the impulse coupler. This
leads me to believe I need to do something to lock the impulse out in order
to time these together.

Any help appreciated.
Thanks
Tim

[quote] --


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bobbyhester(at)newwavecom
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PostPosted: Sat Dec 22, 2007 1:32 pm    Post subject: Timing 0-360A1A Reply with quote

If I remember right there are marks both on the front and on the back,
the marks on the back line up with the slit in the case at the top and
the ones on the front line up at a point on the starter. I think!
Someone else let Tim know if this is right.

----
Surfing the web from Hopkinsville, KY
Visit my flying RV7A web page:
http://home.newwavecomm.net/bobbyhester/MyFlyingRV7A.htm


Tim Bryan wrote:
Quote:


It appears the timing on my 0-360A1A is off some. Since the points are not
opening at the same time I need to make some adjustment. My flywheel has a
line on it for TDC as well as 25 degrees. Where should the mark for 25 be
aligned on this engine for timing? I had thought it was the split in the
case but apparently that may not be the true.

My right mag points are opening well before the left mag but the left mag
seems pretty well opening with the impulse coupler.

I don't have an engine service manual for this engine, thus I needed to ask.
Thanks
Tim




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pitts_pilot(at)bellsouth.
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PostPosted: Sat Dec 22, 2007 1:55 pm    Post subject: Timing 0-360A1A Reply with quote

Tim Bryan wrote:

Quote:


It appears the timing on my 0-360A1A is off some. Since the points are not
opening at the same time I need to make some adjustment.

Appears? How do you know??? did you use a 'buzz box'???


Quote:
My flywheel has a
line on it for TDC as well as 25 degrees. Where should the mark for 25 be
aligned on this engine for timing? I had thought it was the split in the
case but apparently that may not be the true.

It's been a while since I've done the Pitts, and I 'relearn' every

time. Your flywheel should have marks on the front and back. Here's
where my memory gets fuzzy. I think the marks for the case split are on
the forward side and the marks for the starter (never used these) are on
the back. Get the #1 piston to TDC (where the impulse will click) and
you'll be able to see which is correct. You may be seeing a
'difference' because the impulse will fire at TDC until the engine
starts (or your starter whips it fast enough Smile ) while the non-impulse
will fire 25 BTDC.

Quote:
My right mag points are opening well before the left mag but the left mag
seems pretty well opening with the impulse coupler.

As it should be. After the impulse clicks, pull the prop back past the

25 BTDC mark a little, and then bring the prop slowly up to and past the
mark and you should see both mags opening at the same time.

Quote:
I don't have an engine service manual for this engine, thus I needed to ask.

You really should get one ..... actually both the assembly and parts

manuals. The parts manual will cover your specific engine (A1A) so be
sure to specify and get the correct one.
Linn
do not archive

Quote:
Thanks
Tim



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n5lp(at)warpdriveonline.c
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PostPosted: Sat Dec 22, 2007 2:04 pm    Post subject: Timing 0-360A1A Reply with quote

Turn the prop until the impulse coupler snaps then turn it back past
the timing mark then forward to time. On my engine the timing mark
lines up with a hole in the starter housing at the proper timing point.

Larry Pardue

On Dec 22, 2007, at 2:24 PM, Tim Bryan wrote:

[quote]

OK, following up on this question. The left mag points are opening
up about
25 degrees later and coincide with the snap of the impulse
coupler. This
leads me to believe I need to do something to lock the impulse out
in order
to time these together.

Any help appreciated.
Thanks
Tim

> --


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lenleg(at)aol.com
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PostPosted: Sat Dec 22, 2007 3:51 pm    Post subject: Timing 0-360A1A Reply with quote

Mine too .... I usually put a small drill bit in the hole on the starter to align with the mark on the flywheel.

Len Leggette


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n616tb(at)btsapps.com
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PostPosted: Sat Dec 22, 2007 9:45 pm    Post subject: Timing 0-360A1A Reply with quote

Hi Linn and others,

Yes I have a buzz box on there and after reading the comments I have located
the hole in the starter. The right (non-impulse) mag is opening in the
right spot with the 25 degree line at the little hole in the starter. The
left mag however is opening at zero when the impulse fires so I will recheck
in the morning to see if I can move the prop back a little after it fires
and see if they are opening the same. It seems I did this inadvertently
once or twice and it was opening at the 20 degree mark. I will recheck this
to see. If the left mag is firing at 20 degrees can I just move it so when
I use the procedure it will open at the same time as the right mag?

Thanks for the help, and I agree I think I should obtain a good service
manual for the A1A.

Thanks for the help.

[quote] --


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pitts_pilot(at)bellsouth.
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PostPosted: Sat Dec 22, 2007 10:34 pm    Post subject: Timing 0-360A1A Reply with quote

Tim Bryan wrote:

Quote:


Hi Linn and others,

Yes I have a buzz box on there and after reading the comments I have located
the hole in the starter. The right (non-impulse) mag is opening in the
right spot with the 25 degree line at the little hole in the starter. The
left mag however is opening at zero when the impulse fires so I will recheck
in the morning to see if I can move the prop back a little after it fires
and see if they are opening the same. It seems I did this inadvertently
once or twice and it was opening at the 20 degree mark. I will recheck this
to see. If the left mag is firing at 20 degrees can I just move it so when
I use the procedure it will open at the same time as the right mag?

Wellll, maybe. If the mag is off by 20 degrees, I doubt that you'll be

able to rotate the mag far enough to get it back in time. It may be off
one tooth which means you'll have to pull the mag out, rotate it (in the
right direction!!!) and then re-insert it one tooth from the original
position. The mag should be in time somewhere close to the center of the
adjustment range. Take your time and repeat the process a few times,
making sure that you trip the impulse, move the prop backwards past the
mark but not far enough for the impulse to engage again, and then pull
the prop to approach the timing marks. This will take out any lash in
the mag drive train.
Linn
do not archive

Quote:

Thanks for the help, and I agree I think I should obtain a good service
manual for the A1A.

Thanks for the help.




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ronlee(at)pcisys.net
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PostPosted: Sun Dec 23, 2007 9:05 am    Post subject: Timing 0-360A1A Reply with quote

Learning on your own is admirable but this may be a case where
hiring an A&P to show you how to do it may be in your best interest.

Ron Lee


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bo124rs(at)hotmail.com
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PostPosted: Sun Dec 23, 2007 11:55 am    Post subject: Timing 0-360A1A Reply with quote

Tim, I think you will find good reading here:

http://www.sacskyranch.com/timingbendixslick.htm

http://www.sacskyranch.com/faqslickmagneto.htm

Dana Overall
Richmond, KY i39
RV-7 slider, Imron black, "Black Magic"
O 360 A1A, C/S C2YK-1BF/F7666A4
http://rvflying.tripod.com/blackwing1.jpg
http://rvflying.tripod.com

The best games are on Xbox 360. Click here for a special offer on an Xbox 360 Console. Get it now! [quote][b]


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n616tb(at)btsapps.com
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PostPosted: Sun Dec 23, 2007 12:02 pm    Post subject: Timing 0-360A1A Reply with quote

With the help, I think I got it all figured out. Results:

Data plate indicates timing is 25 BTDC.
The left mag with impulse points open exactly at 25 BTDC
The impulse fires exactly at TDC
The right mag points open at the valley before the timing mark indicating
they open about 1.5 degrees early. According to all indication I have found
if it is within 2 degrees it is acceptable.

I guess I am concluding the timing is OK. And the bonus is I understand it
again as I had done this before but several years ago. I just had forgotten
how to go through this process.

Thanks to all, happy building
Tim

[quote] --


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n616tb(at)btsapps.com
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PostPosted: Sun Dec 23, 2007 12:16 pm    Post subject: Timing 0-360A1A Reply with quote

One more question. Does moving the mag to time it also move the point where
the impulse fires? It seems to be right on 0 where it needs to be.
Tim

[quote] --


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pitts_pilot(at)bellsouth.
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PostPosted: Sun Dec 23, 2007 1:26 pm    Post subject: Timing 0-360A1A Reply with quote

Tim Bryan wrote:

Quote:


One more question. Does moving the mag to time it also move the point where
the impulse fires?

Yes.


Quote:
It seems to be right on 0 where it needs to be.

Then one of two things is happening ..... either the impulse is firing

(either earlier or later) than the 25 dbtdc ...... or the right mag
isn't timed correctly since there seems to be some difference. What you
want is for both mags (with the impulse tripped) to fire at 25 BTDC
..... and let the impulse difference go by the wayside. If it's close,
it'll do it's job.

How much time on the mags??? Recommended 'overhaul' is 500 hours, but I
know of few folks that follow that. Most owners wait 'till there's some
degradation or complete failure to do anything. The points do wear and
the e-gap will change over time, not to mention coil and cap changes as
they age. The first time I had my mags done, the improvement was
astonishing. I could no longer start on both mags (no key start)
because the sky-tek starter spins the engine so well the non-impulse
would fire and kick back.
Linn
do not archive

Quote:
Tim



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pitts_pilot(at)bellsouth.
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PostPosted: Sun Dec 23, 2007 1:31 pm    Post subject: Timing 0-360A1A Reply with quote

Tim Bryan wrote:
Quote:
Quote:
--> RV-List message posted by: "Tim Bryan" <n616tb(at)btsapps.com> (n616tb(at)btsapps.com)

With the help, I think I got it all figured out. Results:

Data plate indicates timing is 25 BTDC.
The left mag with impulse points open exactly at 25 BTDC
The impulse fires exactly at TDC
The right mag points open at the valley before the timing mark indicating
they open about 1.5 degrees early. According to all indication I have found
if it is within 2 degrees it is acceptable.
Don't take offense, because I don't know your personally, but I think that's sloppy. You have everything you need to take the time to reset the right mag so it fires at 25 BTDC like the keft one.
Quote:
Quote:
I guess I am concluding the timing is OK. And the bonus is I understand it
again as I had done this before but several years ago. I just had forgotten
how to go through this process.
Take your time and do it right ...... get 'em dead nuts on. You're wasting HP and fuel ...... maybe emmeasureable, but it's there.
Linn
do not archive
[quote] [quote]

Thanks to all, happy building
Tim

[quote]--


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n616tb(at)btsapps.com
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PostPosted: Sun Dec 23, 2007 4:22 pm    Post subject: Timing 0-360A1A Reply with quote

Hi Linn,

No offense taken. I simply concluded it was OK because the documentation I found said it was acceptable. I already adjusted it to be right together earlier because I saw no reason not to. Anyway I am happier with it done. Thanks for your help and insight.

Tim


From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of linn Walters
Sent: Sunday, December 23, 2007 3:24 PM
To: rv-list(at)matronics.com
Subject: Re: Timing 0-360A1A


Tim Bryan wrote:

Quote:
--> RV-List message posted by: "Tim Bryan" <n616tb(at)btsapps.com> With the help, I think I got it all figured out. Results: Data plate indicates timing is 25 BTDC.The left mag with impulse points open exactly at 25 BTDCThe impulse fires exactly at TDCThe right mag points open at the valley before the timing mark indicatingthey open about 1.5 degrees early. According to all indication I have foundif it is within 2 degrees it is acceptable.

Don't take offense, because I don't know your personally, but I think that's sloppy. You have everything you need to take the time to reset the right mag so it fires at 25 BTDC like the keft one.

Quote:
0
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1
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2
Take your time and do it right ...... get 'em dead nuts on. You're wasting HP and fuel ...... maybe emmeasureable, but it's there.
Linn
do not archive

Quote:
3
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4
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5
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6
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7
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8 [quote][quote]--


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