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  #21  
Old 08-31-2018, 02:33 PM
Ron Springer Ron Springer is offline
 
Join Date: Apr 2012
Location: Rockville, MD
Posts: 8
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Quote:
Originally Posted by krw5927 View Post
Are you certain the magneto is timed to 28 degrees BTDC? This is 3 degrees advanced timing, and from the forums over the years, doesn't seem to be a very common practice.
Well, I didn't say what engine I was talking about. This is for a Continental O-200 and the data plate is stamped for 28 deg BTDC. And the magneto is a Slick 4300 series.

Last edited by Ron Springer : 08-31-2018 at 02:36 PM.
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  #22  
Old 08-31-2018, 02:59 PM
jrs14855 jrs14855 is offline
 
Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,393
Default Mags

The 0 200 is a relatively low compression engine and will tolerate far more timing advance than the high compression Lycomings. The 0 200 in the F1 Racers commonly run VERY high advance settings. However almost all of these aircraft are trailered and most only fly an hour or two a year.
I have no recent experience with the Slick mags but the 500 hour overhaul definitely applies. You need to check with a specialty shop about the impulse.
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  #23  
Old 08-31-2018, 03:38 PM
deek deek is offline
 
Join Date: Mar 2013
Location: Flathead Lake Montana - 8S1
Posts: 334
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Quote:
Originally Posted by jrs14855 View Post
.
Aircraft Magneto in Helena MT is a highly regarded shop. Just ask for a check of impulse and internal timing. $200 plus/minus against the cost of a new engine if the impulse comes apart.
They're in Missoula, not Helena
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  #24  
Old 09-01-2018, 10:28 AM
Ron Springer Ron Springer is offline
 
Join Date: Apr 2012
Location: Rockville, MD
Posts: 8
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Follow up ....

I repeated the same test of where the mag snaps on a different plane with a similar new, rebuilt Slick mag and it snapped very close to TDC where I expected. So, I don't think that there is anything normal about my result where it snapped well after TDC on my plane.

I also talked to the builder of the plane and was able to piece togther the history of the magneto. It was installed new on June 23, 1995 and that was 1091 hours ago. It has never been opened and serviced to his knowledge in all that time (no internal timing adjustment, no 500 hour inspection, etc). I think we got our money's worth out of this mag, so a new one is being ordered.
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