jceltalentoso

ok i have dilema i bought a car with a b16 engine 2 years ago. after this time with the car i decide to start to building it ..... i send my head to machine shop to get some job done and i noticed that my b16 block its been sleeve to 83.20mm after clean up the pistons i noticed that those pistons are from a 88-89 prelude from an A20 (over 0.50mm )motor non vtec and the CR for those piston was 9.2.1 low compression .......but what compression should i have ????? the car runs strong and nice .....but dont know what compression i have and i want to tune the car....any idea ??

head
port and polish
itr manifold port to 68mm
throttle body 68mm
brian crower spring an ti retainers
jdm valves
blox type b

block
pr3 rods with acl bearing
pr3 crank with acl
a20 pistons

PS. i not an expert and dont have that much experience sorry for my poor knowledge Im here to learn!!!

thank you!!!

jceltalentoso

doood

iTrader: (1)

only way to figure it out is cc the combustion chamber and the piston in the bore then do a little math

crxsi1

??? Why don't u just put some after market pistons in there... Then ull now the cc and u would have no worries.... The b16 loves high compression and works at its full potential... I mean its what helps these little guys go and u wouldn't want to de-tune it. I forget what the numbers are but every 1 compression is around 5hp and that believe it or not can make a difference with these guys... Gives it that little extra POP...

jceltalentoso

if I had wanted to change the pistons never put this post ... I need to know the compression in order to know what route to take

crxsi1

Well then what is the plan youre leaning towards... With thoughs pistons in there u should have really no clearance problems.... And like I said, even though u don't really want to take them out of there you would be detuning it... Inless ur turboing it but i figured not since where in the all motor forum... These b16's love high compression and high rpms... Hope I don't sound like an *** just trying to help... But all in all you are gonna need to know the cc of the head, piston and bore so you won't really know till u get the head back... And ask them before they send it back to you