Re: Help!! Engine Miss
 

It is funny you mention that. I bought 100' of the braided ground strap material from Ebay. Do you know how far 100' will go?

Lets just say that if I ever crash my car, I won't die from the impact. It will be from strangulation. :eek:

Re: Help!! Engine Miss
 

Tim,

Leakdown test was performed cold. Engine hasn't been run in 2 weeks.

-Ben

Re: Help!! Engine Miss
 

Ben,

First of all, I'm no expert so take this for what it's worth....

1) After dyno session, did you back the rockers off when it sat until you got it in the car?

2) When I do a leak down, I typically run the car up to 140-150 then attempt to zip through the test with warm cylinders. The cylinders that are over 5% I would smoke test, go by a cheap cigar and have it over the carb/intake opening and exhaust port/ header tube when performing this scientific test... don't laugh, it works.

Other than everything else mentioned, get it to a track or bring it up north. My trans builder has a chassis dyno and has had many BBC on it. Sounds like a fun mystery!

Tim

Re: Help!! Engine Miss
 

Now the chassis dyno sounds like an excellent idea, that's even better than track time. you test the whole car, and you can hook diagnostic equipment to it and then duplicate the problem.

Re: Help!! Engine Miss
 

I've actually been thinking about the chassis dyno idea for a couple of weeks now. There's a speed shop with an in-ground dyno about 10 miles from my house. I'm not certain how experienced the operators are in terms of diagnostic abilities, but at the very least, I'd be able to see how it responds at full throttle under load.

-Ben

Re: Help!! Engine Miss
 

Ben, make sure you have plenty of clutch pressure before you put it on the chassis dyno. Good luck.

Re: Help!! Engine Miss
 

Arnold,

Thank you. I wouldn't have thought of that.

Re: Help!! Engine Miss
 

Have you looked at the valves to make sure they all open the same as you bump over the motor(no mess that way) If they all seem to open all the way chances the cam is ok. If this car is an automatic I would unbolt the torqconverter and see what difference that makes. make sure you push it back out of he flywheel. :cool:

Re: Help!! Engine Miss
 

Run a compression test anyway. If you have a flatttened cam lobe-particularly intake- the compression may show low on that/those cylinders. Happened to me on a brand new motor.

Mike Moller

Re: Help!! Engine Miss
 

Hi Ben,

This is my first reply on this site, so hopefully I get it done correctly.
Before I describe a similar situation which I had, trying to chase down a "miss" in the engine, and what was causing it, I have one question; do you have a spacer plate below your carburetor?