whats the difference between a b18c1 and a b18c5?

 

B18C1 is the motor that came in the GSR, it has a different head design than the B16 and Type R head, of course different cams, lower compression ratio, different intake manifold design and bolt patter for it.

The B18C5 is the motor than came in the USDM Integra Type R, uses the same head and intake manifold design as the B16, a 10.6 compression ratio, more aggressive cams than the B18C1.

I think the horsepower ratings for them are 170hp for the GSR and 195hp for the Type R.

Hopes this helps.

 

about 1 point compression on the c5, different exhaust mani, different intake mani, different tb.... c5 has basically a b16 cast head thats hand ported and comes w/ lumpier cams. not to diss on anyone.... but i personally dont care for the c5 and would much rather get the c1.... the c5 makes more stock hp, 195 compared to the c1's 170, the c5 will be a more reliable way to make hp if you're keeping both motors basically stock w/ just bolt ons... simply cause it makes more power stock.... but i would rather save the 1000 bucks from the difference between the two and get the gsr....oh, and if you want bottom end numbers... basically same bottom end.... 3.433 stroke, 3.189 bore, 5.429 rods, 1.58ish rod ratio, blah blah blah.....i'd go c1