Here's the deal. I already have a B16A1 swap and it's going into an '89 CRX HF. Well I wanted to build a motor I happened to come across for a relativly decent price for just the block. (by just the black I mean JUST the block. Will all the components of the B16 swap over to a B17 block? I figure the pistons and rods will, but what about the crank? Does rod length make the difference in the .1 liter or bore size? Thank for any info you might be able to provide.

 

the crank makes up the .1 liter difference.

 

The B17A bare block is actually identical to the B16A block. But the pistons, rods, and crank are different. The B17A crank gives you about 5mm more stroke. This is where the extra .1 liter comes from. Also, the rods are shorter in order to accommodate the increased stroke. But if you use the crank and rods together, you can stroke your B16A to 1.7 liters. The pistons are also different. But since they actually decrease compression ratio, they are not desirable for an allmotor application. B17A compression is 9.7:1. If you use these pistons in a B16A (with its shorter stroke), compresion will end up even lower. However, using B16A pistons on top of the B17A crank and rods will probably give you compression somewhere in the mid to high 10's. This, along with the displacement increase, would certainly be helpful in a B16A. On the other hand, B16A components will fit in a B17A block just as they would in a B16A block since the block is the same.

 

Thank you guys so much for all the informative stuff on the two blocks and the differences. I was planning on replacing the pistons and rods anyways. I guess I'll have to source a B17 crank or it might be better to just to search for one complete shortblock when it turns up and work from there. I was planning on resleeving it, but I'm kind of at a crossroads between turbo an all motor. I was thinking of keeping it all motor just because this would be the daily driver and the 240 the turbo car, but I'm wondering if I could get the block toss everything over and go with light boost due to the lower compression ratio for now. I have no idea how I'd source a B17 crank...I'll just wait for a complete B17 motor to turn up.

Thanks for all the info once again guys!

 

What is the difference between a b17 head and a b16 head?