Ok, so quick question. Engine cold - 150psi across the board, except #2,4 - both at 100 psi. Quick shot of oil, shoots #2 to 155, and #4 all the way to 205psi. Still cold.

I'm going to run another comp test on those two cylinders, after the car is warmed up tomorrow.

What I want to know, is that I have none of the 'tell-tale' signs of BHG - coolant/oil mix. Might I have a small crack in teh gasket between the 2 cylinders? Would the oil (15w50, btw) cause that to seal, and give me the higher pressure readings?

If it all checks out after the engine is warmed up, then I'll have to rack it up to the rings not being sealed until it warms up - I didn't bore this block, after all - just re-ringed it, after a slight hone to clean it up.

Still boosts excellent, though

 

If the compression goes up after you do a wet test, the rings are crap. That simple.

Now, if you have a cracked head and that's letting collant into the chamber and that's washing down the walls, that'll look similar. Best thing to do is get a hold of a leak-down tester and see if it leaking into the cooling system or not.

Iff you've got that big a difference when it's cold, the problem will still be there when it's hot, just not as noticable. You can try to live with it for a while, but it'll start getting worse and worse until you have the block bored and seal it up properly.

That suck though man. You've had nothing but bad luck with that beast lately.

Jeff

 

Gonna test it warm now... I have a feeling the bores were simply too far out when I honed it. Hopefully, it seals up when it's hot

 

might be about time to start searching for a 3.4 doward, get the build started now and go from there

 

Ouch, zero increase in seal. Either I severely fried the rings (possible, I was running quite lean) or... I managed to pop the head gasket. I figure I'll tear into it tomorrow, and see what's up... depending on when the wife's working. I've got an appt at 2:30pm in Gainesville, so I may not get to tear into it like I should...

At least the valve cover gaskets and head gasket are cheap

 

I've already got a FWD TGP setup I'm working on... My plans are to get the FWD setup running, with the TGP pistons (heads ++!) and use the iron head 3.1 I've got now, to finish mocking up the intake I've designed

I'll change out the head gasket, and see what that does. I've been meaning to pull down into the heads anyway, and change out the oil seals! I'll start first thing in the morn on it... pics along the way

 

I'll bet you're wasting your time. If you get an increase with a wet test, it's the rings, it's the only thing it can be. The oil that you put in there can't get up there high enough to get to the head gasket. it leaks down the walls until it gets to the rings, then spreads out from there. It just doesn't seal the head.

Just something to think about before you go tearing into something just to find out that you had the answer before you got in there. I've done that plently of times and man am I getting tired of doing things twice. Lol

 

The only reason I'm thinking of replacing the gasket, is the fact that after quite a few hard runs, the oil did look a little... hmm... chocolatey


We'll see, after I get teh head off. Like I said, I need to replace the seals anyway

Although, now that I've gotten a late start on it, I may just go hit the track as is, and worry about it later