You guys think 600RR ITB's are to small for a b20 vtec ported and polished head, JE 12.5:1?

 

i also want to know.

 

I dont know but a 1000rr probaly would be better

 

not necessarily. bigger isn't always better and with my boss's calculations (some crazy **** he does in his head) we've decided to use 38mm ones. Its a street car so we felt going bigger would cause some problems down low.

we're starting w/ the 38mm ones and if we need bigger we'll just bore them out. We're also trying out different velocity stack designs and lengths to see which works best. All testing will be on our dyno.

 

I had a Suzuki 750 (42mm plate) on a B18c with CTR pistons and had great response, but feel a lack of top end. Best I ran was 13.6et. Then, I upgrade to a Hayabusa 1300 (45mm plate) and gain top in. Drop my time to 13.4et. I personality think the 600RR would be too small, should go with a Suzuki 750 or the 949rr.