45mm throttles are better suited to engines with 1600cc to 1900cc
50mm throttles are best suited to engines with approx. 2L capacity over
Smaller throttles offer improved airspeed & better response/midrange
Is this b series specific? Or can this be applied to k series also? So 50mm for a standard k20a?
what is the stock stroke on a B18c? and i didnt think you could bore out a B18 that far?
B18C = 87.2mm / B18A~B B20B = 89.0mm
Use a B18 block with 82.0mm bore & 89mm stroke = 1880cc
Another combo that works well is 81.5mm bore with 95mm stroke - 1982cc
B20A crank / H22A rod / Toda piston. - Rod ratio 1.51:1 / C/R 12.4 without machining
Last one I tuned (like that combo) made 164kw @ the wheels @ 8500rpm (8800rpm rev limit)
The throttle size was 52mm (Jenvey) & it would have likey made better mid range torque with 50's
Originally Posted by u mad?
Is this b series specific? Or can this be applied to k series also? So 50mm for a standard k20a?
Can be applied to K's too....
50's are awsome for 2.0L K20A & 2150cc K20A. (Tim's 12PIN is a good example)
Big K's (2.5L+) that rev would need to be larger
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Originally Posted by lookingforboost
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