greetings,
well, after spinning a big end bearing in my turbo'd 3B, i'm wondering about options before i do it again to the replacement engine! now, i don't know for sure that the spun bearing was directly attributable to having a turbo installed on a non-turbo engine, but i would certainly like to reduce the possibility.
i'm guessing that lowering the compression ratio (and maybe turning the wastegate down a bit!) would allow the engine to tolerate the extra pressure. the 13B-T has (i think) an 18:1 ratio while a 3B has 20:1.
it seems there may be different options, but i'm not versed in the affairs of the machining world. i'm guessing i could do one or more of the following:
1) install pistons from a 13B-T. will they fit into a 3B? if so, can i just use the pistons or do i need to use the con rods as well?
2) shave the existing 3B piston tops. is there enough meat to do so?
3) machine the head to create more volume. can enough metal be taken out to affect enough reduction in compression?
i'm not even considering a thicker head gasket as i've read of too many horror stories when going that route.
i would appreciate any "real world experience" stories and comments, particularly from engine builders.
cheers,
roy
well, after spinning a big end bearing in my turbo'd 3B, i'm wondering about options before i do it again to the replacement engine! now, i don't know for sure that the spun bearing was directly attributable to having a turbo installed on a non-turbo engine, but i would certainly like to reduce the possibility.
i'm guessing that lowering the compression ratio (and maybe turning the wastegate down a bit!) would allow the engine to tolerate the extra pressure. the 13B-T has (i think) an 18:1 ratio while a 3B has 20:1.
it seems there may be different options, but i'm not versed in the affairs of the machining world. i'm guessing i could do one or more of the following:
1) install pistons from a 13B-T. will they fit into a 3B? if so, can i just use the pistons or do i need to use the con rods as well?
2) shave the existing 3B piston tops. is there enough meat to do so?
3) machine the head to create more volume. can enough metal be taken out to affect enough reduction in compression?
i'm not even considering a thicker head gasket as i've read of too many horror stories when going that route.
i would appreciate any "real world experience" stories and comments, particularly from engine builders.
cheers,
roy