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4bd1
Posted: Sun Jan 24, 2010 3:00 am
by lexi
What`s the CR on a 4BD1 ? Did Izuzu alter the CR when they turboed it?
When guys add a turbo themselves do they alter CR?
Posted: Sun Jan 24, 2010 10:11 am
by ISUZUROVER
CR of na and turbo motors is the same.
17:1 from memory.
Posted: Sun Jan 24, 2010 10:29 am
by Bush65
As Ben said, 17:1 for both.
No need to alter CR.
I'm not sure at what year the N.A. engine had alfin pistons. There is no reason to use anything else than the stock Isuzu alfin pistons.
The 4BD1T engine will operated happily with quite high boost pressure. You might like to change from stock head bolts to after market studs if you plan to use more than 40 psi.