2 issues:

1st issue

I'm considering boring, sleeving my F23(yeah, I know it's a SOHC in a heavy as hell car, 99 accord cpe), and I was wondering how much additional HP I'd be lookin' at with a 10.5:1 from 9.3:1 with the "oh so famous" godzilla sleeves from Eagle Manu.? I know I should go turbo for the most significant gains, but
I don't want to part with my header & race division intake investments.

2nd issue:

I'm losing oil, but not compression(compression test pumped out 180s), and there's no leaks...I think it's a valve seal problem, but not sure. Any theories? Can you upgrade valves? How much? Go easy on me, I'm a noobie.

 

Although I don't have exact numbers or this, it should not go over 10hp gained. You will, however, gain hp and torque steadily as rpms go up. Normally, it should not move your maximum hp or tq on the powerband; Your new max hp should be at the same rpm where your max hp was before, and same for the torque.

 

10hp? That is way lower than any other estimates I've gotten. I've been told 30% HP increase at 10.2:1,(45 hp increase), and I've been told 20% hp increase @ 10.2:1. Naturally, this is by machine shops.....I'm thinking about going up to 10.5:1 compression with sleeves, why do you guess it would only be 10 HP? What kind of experiences have you seen that justifies this answer? Anyone else want to give any second opinions???

 

30%? dont think so
its 1-2HP per .1 compression you increase.

this is why thinner headgaskets are a waste of money.

 

I heard somewhere you could expect a 5% gain for every point you raised your compression. So I'm guessing 10 bhp for you, if youre lucky.

 

ACTUALLY, its 1-2% for every 1.0 increase.

 

Actually there's no hard and fast rule to it. How much power output gained depends upon too many combination specific factors to garner any general terms for % increase for a given engine. Compression ratio has a small but measureable effect on optimal cam profiles, optimal a/f ratio and ignition timing. How well the setup is tuned for the new static CR goes a long way towards making measurable gains.


[Modified by texan, 3:29 AM 12/13/2002]

 

really? that low? lol

 

It also depends on the revvability of the engine. Since hp is a result of torque multiplied by rpm (very simply put, there's a formula for this), if you have a 6500rpm revving f23, figures will be lower than the same setup for a gsr for example, where you'd expect a slightly higher hp gain.

 

If you are going to sleeve it then turbo the **** out of it for sure!

 

every 1.0 point is 8 to 10% gain in horsepower