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weak compression

 
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kerrjohna(at)comcast.net
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PostPosted: Wed Feb 01, 2006 7:47 am    Post subject: weak compression Reply with quote

Bob Robertson....

When pulling through the prop on my 912UL, every fourth compression stroke seems to offer less resistance than the other three. I have not done a compression check but am wondering what the toubleshooting steps aught to be. I'll remind you that the rocker arm replacement has not been completed on this engine.

John Kerr
700 + hours

Bob Robertson....

When pulling through the prop on my 912UL, every fourth compression stroke seems to offer less resistance than the other three. I have not done a compression check but am wondering what the toubleshooting steps aught to be. I'll remind you that the rocker arm replacement has not been completed on this engine.

John Kerr
700 + hours


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lcfitt(at)sbcglobal.net
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PostPosted: Wed Feb 01, 2006 4:35 pm    Post subject: weak compression Reply with quote

John, this is a common occurance with my engine. When we were on our way
to Oshkosh two summers ago, after a fuel stop at Afton , Wyoming, I climbed
in to move the airplane to a tiedown spot and the starter turned spun the
engine just like a turbine - four stuck valves. We ran two quarts of ATF
through it and no stuck valves since. The ATF was a substitute for Marvel
Mystery Oil as it was not available in town.

My guess that on occasion a valve will not seat completely when cold and as
I mentioned it is fairly common with my engine. However, when I do the
compression check - warm engine - at my annual condition inspection, the
compression on all four cylinders has always been well within limits - 79-80
psi.

Question, do you run on autogas or avgas or a combination.

Lowell

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kerrjohna(at)comcast.net
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PostPosted: Thu Feb 02, 2006 9:38 am    Post subject: weak compression Reply with quote

Lowell, thanks for the reply. I rarely run avgas--on cross countrys when mogas is not available and I always use blended oil.

I admit to being a little goosey because Bob Robertson and I sort of came to the conclusion to not change out the rocker arm shaft way back when. As I look over the engine log books I have noted that I am using less pitch now than back in '96 although the indicated air speed is still right at 105 mph at 5200 rpm. Not sure that that makes any sense.

I have been flying the new RV9 for the past 6 weeks when weather permits but when I flew the 'Fox last week I remembered why it was so danged much fun (and guilt free as well).

John

-------------- Original message --------------
From: "Lowell Fitt" <lcfitt(at)sbcglobal.net>

[quote]

John, this is a common occurance with my engine. When we were on our way
to Oshkosh two summers ago, after a fuel stop at Afton , Wyoming, I climbed
in to move the airplane to a tiedown spot and the starter turned spun the
engine just like a turbine - four stuck valves. We ran two quarts of ATF
through it and no stuck valves since. The ATF was a substitute for Marvel
Mystery Oil as it was not available in town.

My guess that on occasion a valve will not seat completely when cold and as
I mentioned it is fairly common with my engine. However, when I do the
compression check - warm engine - at my annual condition inspection, the
compression on all four cylinders has always been well within limits - 79-80
psi.

Question, do you run on autogas or avgas or a combination.

Lowell

---


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