i have a b16 with deckplate...i was told it was with 81mm bore and 87.1 stroke..so whats my displacement...i read that you do the maths by doing the product of the 2 but i think im missing something as the number didnt look right.

i guess you didn't search good enough... found it http://www.c-speedracing.com/h...c.php

displacement in general = (bore/2)*(bore/2)*pi*stroke*number of cylinders

for a 4 cylinder= (bore/2)*(bore/2)*pi*stroke*4

can be simplified to =bore*bore*pi*stroke

in your case 8.1*8.1*8.71*3.14159=1795.304276757649372410901422 0034 cc's

thanks...that really help..

Another slight variation . . .

(pi/4) * (bore^2) * (stroke) * (# of cylinders)