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Does anyone know what the maximum compression ratio the turbo block could stand? And how would you calculate the difference between CR from boost versus mechanical CR? EG: Xpsi boost = Npsi in a normally aspirated engine.

I'm wondering if this block (or more importantly, the heads) could take the ~20 psi required for a diesel engine. I have no idea how anything else will work for the moment in terms of engine management, but I'm thinking I could use the spark plug port for a fuel injector from a European direct-injection engine. This is all just desk top engineering at this point, but I wonder what an EJ22 diesel in a 2100 lb GL would get for mileage.

Steve

my 2ltr regularly sees 20psi, it has std internals and heads, can't see why not. however that boost level is just about the limit for the factory head gasket

If you read the sticky, you will see that Marc R. used to run25 psi daily and 32psi or so on the track. But that was also on a 7.5:1CR engine...

I have seen the formulas around here before, but am too lazy to find them. Sorry, maybe Thawa or VRG3 will pop in with the link...

greg donovan posted info here: http://bbs.legacycentral.org/viewtopic.php?t=16303

I thought psi and comp ratio were two different things but related. I believe it was vrg that was telling me his brother was thinking about turning his supra negine deisel or something, but really I dont remember.

I've read all those and I understand that the engine can take a lot of boost. I'm not necessarily looking to calculate actual CR here. What I'm wondering is boost pressure more, less, or equal in terms of stress to the ~20:1 compression ratio I would need to run the engine as an N/A diesel. Obviously I would need custom pistons and I would use stronger head bolts and better gaskets. My question is if the block could handle it. If boost pressure is equal or more stressful to internal components than mechanical CR, then I'd say it may be an interesting idea, though reliability and longevity will be an unknown. The only other all alloy diesel I know of in production is in the new Euro Accord. This lead me to wonder if a turbo block is strong enough to handle diesel duty.

Steve

IIRC, the 1.9TD in VW's has about an 18:1 CR...

Can the EJ22T block take it? Yeah probably. Can the heads take it? Maybe. I don't think they'll flow enough for optimum efficiency, but I don't know if they'll crack or anything...

Can the headgaskets take it? Buahaha I seriously doubt it. You would probably have to put 2 gaskets on there and torque the head bolts down even more to hold that CR...