Re: which 2TG model to use to TURBO ?! ATTN - ROD TRY ?!
Tue, 17 June 2003 14:24
Sorry bout hijacking ur post again Snyper.
But in reply to inferno,
If you already know you comp ratio with the original gasket (say 40thou = 1mm) and you know the displacement (2TG?) then you can work out the current combustion chamber and head gasket volume and use this to recalculate the new comp ratio.
comp ratio = cylinder volume / (combustion chamber volume + head gasket volume)
The amount of reliable boost depends on intercooling and fuel richness levels among other things. Given that the engine is prevented from detonating, you should be able to run high boost (inexcess of 15PSI). Most toyota motors have a strong bottom end.
Decreasing comp by using copper head gaskets is not a good thing, better using dished pistons. Not only does the increased thickness expose more copper to the combustion process you are also playing with something called the squish height. The squish height is determined by the difference from the top of the piston at TDC to the bottom of the head face. It should be kept at a certain height (differs upon application) in order to work correctly. This is because squish greatly affects at what point the engine begins to detonate.
The copper gaskets will hold up ok provided you prevent detonation.
Snyper,
I have only seen a couple of different heads, the 88222 and 88261. The 88261 offers a better combustion chamber design that should promote increased swirl (more complete combustion). What power differences this would produce, I don't know.
Tue, 17 June 2003 14:24
