I just picked up a b17 crank/rods/pistons for my 00 civic si, I'm not interested in lowering my compression or r/s so using the b17 rods/pistons is out and i'm not ready to go with forged internals until i decide to bore and sleeve the block. Does anyone know what cr i'll get with the b17 crank with b16 rods/pistons? I would expect an increase but does anyone know by how much?


[Modified by Deltax75, 4:04 PM 5/20/2002]

 

ok first off you CANNOT use the B16A rods + B17A crank in a B16/or B17A block. The B16 rods are too long to be used with the B17A crank; the piston will stick out above the deck if you do this.
YOU NEED TO USE THE B17A RODS.
You can dump the B17 pistons and use the B16A pistons though.
If you kept the stock B17A rods/pistons/crank and put these internals into your B16A block (aka stroking it), you're compression would be dropped to that of a B17A's compression ratio. Now if you used the B16A pistons from your Si block, your compression ratio would be about.. 10.5cr . So bumping up your stroke, 1 liter bumps up the compression .3 points, if you stick with your Si coupe's pistons (PR3 b16a piston).

Of course your compression ratio will change if you use a thinner headgasket, go wider diamter (oversize) piston, use a GSR/P72 head, or mill your b16a head..

If you went CTR pistons, your CR would be about 11.4.