Discussion in 'Engine Building' started by CRX_B16B, Oct 17, 2003.
Will the c/r go up to 10.8:1 if you put the CTR pistons in a b16a?
you will get around 11.5:1
and compression runs between 10.2-10.4 on oem B16a's.
Not according to c-speed. The have it at ~10.8:1 in an otherwise stock B16A.
11.5:1 is s2000 territory =)
notice on c-speed how they consider the b16a/b to be the same block, whats up with that?
The B16A and B16B have different deck heights. The B16B shares the same height as the B18C whereas the B16A has a shorter height, i.e. higher compression when using pistons meant for the taller B16B. If tuned correctly, CTR pistons in an OEM B16A can yield good results, and even better gains if you use good cams such as TODA Spec B's.
bottom line here, but them in, get a good set of cams, get it tuned right, and you'll rip!
Because the B16A/B have the same piston to deck clearance. They aren't saying the blocks are the same, just that the pistons are the same distance from the top of the block at TDC for the B16A/B.
i stand corrected, i did not look closely enough. i have always heard that you will be near 11.5:1 with ctr pistons in b16a and around 12:1 with ctr pistons in a b18c? and this whole time i've been spreading it too...
Wait, my brother always told me that a 99-2000 SI B16a2 has 10.0:1 compression, now you're all saying it has a 10.8:1?
So whats the cutoff for having to use premium? my escort has a 9.0:1 and it will run fine on 87, yet a 10.0/.8:1 needs premium?
you don't read very well, they are saying you will have 10.8:1 if you put CTR pistons in a B16A.
also, there is a nifty reference section that has engine specs.
Having a head on your car that dissipates heat better means you can use lower octane gas... I'd figure the cut-off for premium is at 9.5:1, but that's just a figure that came out of my ass.
oops. sorry yeah I just skimmed it mostly.
So the Si only puts out 111 torque? I thought it put 113 out. bah.
how did they will have the same piston to deck clearance when the CTR piston has a taller dome??
Because deck clearance is not measured from the top of the dome (or bottom of the dish) but from the edge of the piston which is the same distance from the wrist pin on all the B16 pistons (I believe on all the B series pistons but I am not sure about that).
Separate names with a comma.