Junk Motor

[jeffko]

Have any of you guys ever heard of a fuel injection leaning out off idle and trashing a motor to where 6 of 8 cylinders were 30% of the 2 decent cylinders on a compression test? By the way, the engine has less than 10 miles on it.

[RMHINC]

Hey madmax,I just wanted to let you I worked in the garage last night.I had to adjust my clutch.OK Brian at Vintage talked me through it but I was turning wrenches.

[cbreez]

That's not a likely scenario in that little time...are they next to one another? Make sure the leakage is from the rings, not the valves. With a lean condition, you still should have lubrication on the cylinder walls. Did you have a good leakdown test first, then it went bad?
good luck...

[craigayl]

Tell us more.. Did you shoot oil in the cylinders to verify that it is a ring problem? With only 10 miles I'd be more suspect of a valve problem or an assembly problem that was there from day one

[jeffko]

The engine actually belongs to a new cobra guy I am trying to help out and he has taken it back to the engine builder. That is where the finger pointing by the builders and suppliers started.

What do you guys think about the timing somehow jumped to allow it to be way advanced and cause detonation? I have heard that detonation is far more destuctive than a lean condition. I guess I am having trouble with thinking the injection could be the cause for that much damage so quick.

Calling Dr Clayton..........where are you?

[Excaliber]

I hate it when a poster starts THREE threads on the same subject. THAT my friend is 'spam'.

[jeffko]

excaliber, put your sword away...sheez. I was just looking for a few different opinions from the fuel injection and small block guys also.

[jeffko]

Heads were removed. Pistons/cylinders show no signs of being burnt or excessivley worn. Engine is going on a stand next Monday and pistons will be pulled to check the rings. That leaves valves out of time with the pistons. Since it was dynoed at 650hp you gotta think the cam somehow slipped way out of time. It never did idle very well, but we attributed that to the injection needing fine tuning.

I am getting this 3rd hand so I have questions also.

[cbreez]

going back to what you said about having two good cylinders, makes me think the cam timing is ok....I'd pull every valve out, and make sure they are not bent...pour some isopropyl alcohol in the ports before doing that, to leak check them all...good luck to whomever!

[jeffko]

Good point cbreez, I forgot about that.