I'm gettin a crower stroker kit, that changes my liter size to 2.1, and i can choose any compression piston i want, i want some 11:1 compression pistons will i still be straight with stock LS cams? my vavletrain is completely built.....so...... if anyone can hook me up with some answers, i'd appreciate it.

 

It'll run fine but you won't gain much power.

 

I disagree. You're gonna get a VERY noticable power gain if you go from the stock 9.2:1 ratio up to 11:1. Compression is what physically makes the power in your engine. When you go up that much higher, and also increase the displacement with a longer stroke, you're definitely gonna feel it.

 

you'll get more hp/torque and throttle response - power will come in at lower revs due to more stroke. the downfall is your pistonspeed will increase, so I wouldn't take it too much past stock redline even with all the goodies you put in it. I would be curious to see dyno results of this engine.

 

You'll also need higher octane gas than you're running now - at least 93.

 

He can run that easily on 91 octane, my roommate is currently running 12:1 compression on 91 octane. You will notice a difference, but you'll notice more because of upping the displacement more than the compression. It will run fine, but it'd pull a lot harder with a nice set of cams.

 

i agree with your disagreement, but to a point.

stock cams feeding a larger displacement than stock will not make as much power as if he had cams designed with enough lift to feed the larger displacement setup.

but he will get an increase in power from displacement and increased compression... just not as much as if he had cams mad for the application.

he could conceivably be losing as much as 20hp, while gaining 40hp from this, but impossible to pinpoint as i dont have cam specs. but in the end, he could be gaining as much as 60hp if he had the right cams.

 

^^^^What is my computer thinking with all those I's^^^^^^^^


i have also go it ported and polished, when i got that done i lost quite a bit of low end, everyone would take me of the line (but of course i'd catch up ) I have a stage one ACT also.

So i really don't have to worry bout ignition upgrades since i'm not revving that high anyways?

 

His gains will be small in comparison to the gains he will get once he adds cams which can adaquately feed a 2.1L engine.

 

sounds like you might have gone too far with the head - when ur port velocity goes down from removing too much meat from the runners you will lose the bottom end. I usually don't recommend more than radiusing the bottom floor of the ports and cleaning up the burrs in the runners on honda heads - they flow pretty darn good right out of the box. A set of cams would for sure wake up your motor - probably even the bottom end as well!