ok im havin problems figurin this out for myself. let me first start of sayin money is not an issue. Im trying to build a motor for the street and the track that will get me max power. i was wonderin the benies of using the b17 crank v the b18 or b20a crank for a boosted application in a b18a block that is 84mm and sleeved. can anyone help me understand?

from what i can tell the rod ration in a b18a that is 84mm with a 1.7 crank is sweet but i loose displacment. I also have a 95mm b20a crank that i was thinkin of usin, but i hear that i can have rev issues. and last but not least keepin it stock b18 block and crank. what do u guys think? one last piece of info the 95mm crank is knifed edged. so have at it and let me know what the deal is yo.

HiGhOkTaNe

 

gsr or ls crank

no need for big stroke under boost!

 

The B17 crank would be for VERY high revving, although people take a built motor with a B18a/b & B20b/z cranks up to 9-10k as well. You'll need quite a lot of head mods to hold torque up that high. So let that be your derermining factor - MAJOR head work & sleeves = major boost & high-revs (b17), minor headwork = somewhat high revs (B18 crank), major low-end torque (street car with hardwall slicks) = 95mm crank.

 

the smaller cranked the motor is the longer it will last