I'm building a ls b18a. all stock exept pistons and rods. already have a set of eagle rods and its time to order the piston. See I know the lower the compression the safer to boost but at what point is the compression so low it hurts overall performace. I'm looking to boost as much as possible and make the most power i can on stock sleeves but its my daily drive and can't affored to blow agin. it's runig a t3t4. So please give me some insight.

 

9:1 is perfect.. not a slug out of boost and good hard pull in boost

 

I would say nine is perfect but i read a article last month(somewhere on the web)about a dude who blew his 9 compression motor, built a replica except with a 8 compression. Results were like 2% less effectiant @ i dentical boost.

but then they tunred up to boost op the 8 comp and Owned...

 

Whats the most 8 to 1 compression motors can boost on stock honda sleeves.

 

no real answer, its all in the tune

 

10 flat with a nice amount of boost.

 

8.5 works good, but I'm just talking out my ***.

 

20:1

 

More seriously though...

this man is onto it.

the lower you go the more you can push into it safely on crappy pump gas. (excluding the sleeve issues)

i wouldnt go lower than about 7:1 though as you might have trouble starting it below that. 8:1 should be good for about 30psi on 98ron/93aki 9:1 good for 15psi or so.

point being that the negative aspects of going lower are grossly overstated virtually everywhere on the net...

 

9.1 - 9.5