- Fri Oct 08, 2010 11:33 am
#217486
Right same crank as the b18 non-vtec. I've haven't been looking into b-series motors for a while, I keep forgetting that the GSR and LS motors have slightly different cranks.
As far as the JDM b20 head goes ... some of them have a better flowing head. The p8r head, which was found on the b20s that came in the Honda Orthia, have larger intake ports/valves than the p75 (LS) head that is commonly used on the b20s. Other than than that and the slightly larger combustion chamber (47cc vs 45cc) it is the same head as the p75 and as such can accept all aftermarket parts that the p75 head can (cams, springs, etc.) you will however need 1mm oversize intake valves (or intake valves from a B series VTEC engine, IIRC). Just remember if you pick up a JDM b20 do not expect this head as not all of them came with it. They do pop up on e-bay from time to time though.
chrono404 wrote:AutoXCivic wrote:Also for the record the b20 is the same block and crank as the b18b1, just a bigger bore, so it's not a physically larger motor.
fixed that for you. A b20 is basically a Different Sleeved 84mm Bore B18b LS Engine(which is 81mm)
The JDM B20's apprently have better heads with better flowing valves. The Awesome thing about these engines is all the torque you have. From 2k you have over100lbs of torque and it peaks at 131lbs. With the Right transmissions you will easily slay any b16.
My 99Spec JDM B20 with I/H/E and a USDM b16 EM1 Transmission is faster then any b16 I've Ran,a low boost Turbo LSVtec Da(ls transmission),a GSR Swapped EG Si Hatch(with I/H/E, ITR Cams and basemap) and H22A CB7 Accord.
anytime you push the gas peddle down you are pushed back into your seat its awesome. The lowest my fuel economy has been is 21mpg(town) and highest is 29(town) Which considering I'm Running 87 Octane fuel isn't bad at all. If you roll a b16, b18c GSR or H22a then you HAVE to run 91 Octane fuel.
Right same crank as the b18 non-vtec. I've haven't been looking into b-series motors for a while, I keep forgetting that the GSR and LS motors have slightly different cranks.
As far as the JDM b20 head goes ... some of them have a better flowing head. The p8r head, which was found on the b20s that came in the Honda Orthia, have larger intake ports/valves than the p75 (LS) head that is commonly used on the b20s. Other than than that and the slightly larger combustion chamber (47cc vs 45cc) it is the same head as the p75 and as such can accept all aftermarket parts that the p75 head can (cams, springs, etc.) you will however need 1mm oversize intake valves (or intake valves from a B series VTEC engine, IIRC). Just remember if you pick up a JDM b20 do not expect this head as not all of them came with it. They do pop up on e-bay from time to time though.
Straight lines are for sissies.
