SR20 Bore 86.5 or 87mm

[bowflex]

does anyone know the hp gain difference between 86.5 to 87mm? I have 86mm bore currently but have to bore to at least 86.5 and am trying to decide whether or not to go up another .5 mm. I don't want to shorten the life of my engine, but since I have to increase the bore anyway I want to know if I should go a little more.

[n240sxfnatic]

People dont do it for a hp gain, which I doubt there is on .5mm. They do it when rebuilding because it is recommended.

[EDacIouSX]

do the least amount of bore you have to do. 86.5 is good, that way next time you rebuild you can do 87. i think the max bore is 87.5?? 88? then i THINK? you have to sleeve it or something. i am not familiar with sleeving....

http://www.tomei-p.co.jp/_2003web-catalogue/e054_SR20_piston.html

looks like 87.5 is biggest.

[fliprayzin240sx]

A good rule of thumb has been anything more than 87mm, have fun sleeving the block.

[Jodan]

90mm ya pansy!

jk. go with the least amount you can get away with.

[EmmanuelTucay]

Stroke it!