the more i think about what i want to do to my b18a1 the more i want to lean towards an all motor setup. can you bump up the compression ratio with out any ecu modifications and how high of a compression ratio can you run on regular gas.

 

Depends on what you have to tune. With a standalone system like hondata/neptune/etc and a good tuner, I've seen 13:1 run. With no ECU mods, I've seen around 11.5:1 run on premium. On regular, I wouldn't go above 9.5:1. If you want to bump the compression, you're at least gonna have to run premium. To get the most potential out of the B18A all motor, you're going to need a VTEC head.

 

if you start really researching all motor builds. not just honda, but the whole science and art behind it. I think you'll come to the conclusion that static compression ratio is like hp. just a number. when you calculate your cam overlap, stroke, cylinder pressures, flowbench numbers, piston shape and everything else involved you'll get the dynamic compression ratio- the number that matters to the engine, and makes it prone to pinging. you can find engine builders have created some 16:1 CR B16s that run on pump gas....