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Author Topic:   Need engine help
DEllison22X
Member
posted September 24, 2003 06:50 PM
After loosing about 600 RPM's in the feature I decided to pull the plugs, one of them the tip of plug #6 was bent to the electrode. So, I ran a compression test cylinders 1 & 2 had no compression, and cylinder 6 had 50 psi less than the rest.

I took the heads off, it appears that something has beaten around in cylinder 6 as the piston has a bunch of marks all over it. But, there wasn't anything in 1 & 2, the heads looked fine, didn't see a burnt valve or anything.

Does anyone have a clue what it could be? Or what I can look for?

Thanks a lot,
Donnie


racer17j
Member
posted September 24, 2003 08:31 PM
check for a broken valve seat or broken piston ring seen bolth of those on my pick up this year


sdhnc29
Member
posted September 24, 2003 10:05 PM
The only thing that can cause 1&2 to have no compression would be a head gasket blown , hole in a piston , or bent valves . I would speculate that whatever went through #6 , or small pieces of it , also tried to enter 1 & 2 , bending the intake valves and possibly the exhaust valves on the way out . I've seen this happen without damaging a piston . The big question is what went through your engine . Provided that your positive no one accidentally dropped anything into the engine , I would look over your carb. real good . It's common to see butterfly screws and base plate screws fall out . If this is what happened , you might be able to see thread marks in the chewed up #6 piston .

Be sure that the center two base plate screws are never installed in your base plate to prevent this problem . And always loctite butterfly screws .

Steve

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Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


DEllison22X
Member
posted September 25, 2003 10:14 AM
I went up to the garage this morning, and that is what happened. One of the butterfly screws went through the engine. I think I may have had the valves too tight on 1 & 2 cause I backed off the rocker arms on #1 and turned the engine over and it now had compression.

Thanks!

Donnie

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