Washing down cylinder walls, MFI and methanol?

We suspected that at first also. Tried different intake gaskets and ultimately just glued them in place to make sure it wasn't leaking there. As I mentioned I ran a bead of Right Stuff around each intake runner on both sides of the gasket and let it seal. After taking apart there was no sign of leaking at the gasket.... I wish it was that simple. Prior to my last race we tore down the motor, installed new rings and honed it. When we fired it up initially, it was clean and there was no oil. It wasn't until I made an attempted pass and didn't realize I had no boost and we were dumping enough fuel in for 2,500 hp and was only making 700, that it wiped out the cylinder walls and the problem was back.

After talking with several knowledgeable people the only thing we could come up with was that while under boost and with poor seal between the rings and the cylinder walls, it is pressurizing the crankcase and somehow pushing oil back up into the combustion chambers of the cylinders that aren't firing and when the valves open on those cylinders, it's pushing the oil back up into the intake runners..... We do run 11 quarts of oil in this motor based on New Century's recommendation. Maybe it's just too much oil in the motor....

 

These rings were just bought from them two months ago. Are they having issues with rings that recently bought?

 

I appreciate all the comments and thoughts. This has been a very frustrating problem this year.

 

I think this is a case of imagining a problem that isn't logical.
There is no way oil is passing the rings under boost and ending up in the intake ports behind the valve.
Has to be an intake leak. Or valve guides that are wasted.
Adding sealer to something that's machined wrong isn't going to fix the problem.
If it was passing the rings, your puke tank would be full every pass.

 

You are probably right. I'm reaching for answers. That is what we suspected for most of the season. Maybe I need to go back to it. I've checked the angles between the intake and the heads very carefully and they were good. I don't run valve seals but the amount of oil seems to be too much to go past a valve, and we've checked them for wear. Puke tank is not taking on much oil at all.

 

Maybe follow the oil path backwards? Are runners and manifold wet? Throttle body? Could you be losing ProCharger oil? If you had a lot of oil in the cylinders, you should be experiencing some detonation I would think?

 

If you're not filling your puke tank then you're missing something. You're moving oil from a volume that should be at atmospheric pressure into another volume that's at 3+ atmospheres yet the canister attached to the first volume remains empty? An inadequate puke system will cause you lots of problems.

 

Are you sure the rings are being put on the pistons correctly? I hate to admit it but we chased a similar situation a few years back only to eventually find a ring installed upside down. We run a mfi twin turbo deal that we keep plenty rich and never have had a washdown issue.

 

I will go through my set up with a fine toothed comb. There could be something backwards. Thanks for everyone's input on this.