The PERFECT compression ratio?

TheBum · #1 10-28-2002, 04:17 PM

Is there an optimal compression for all motor honda engines that we should be shooting for? Obviously with a turbo we couldnt be running extremely high compression, but with simply all motor parts (built up or not) does more compression (to a certain point) yield better horsepower numbers?

Whats the max i should be shooting for with a b16a2 or an ls.

civickiller · #2 10-29-2002, 04:49 AM

are you looking for a daily driver or a track only car ? also are you tlaking aobut running high octane gas ?

the higher the comp ratio the more hp you will get but a comp ratio can only go so high

TheBum · #3 10-29-2002, 09:38 AM

Im talkin daily driver here. I should have specified that, because that makes a huge difference.

civickiller · #4 10-29-2002, 04:40 PM

i wouldnt go more than 12:1. but i personally would go 11.5:1 just to be safe

SmoovSol · #5 10-31-2002, 08:32 AM

if you go with a gude all motor head the compression I believe for the sohc is 12:1, in my opinion you better always fill up on 94 octane and have an upgraded igntion, wires and all that to be safe. All motor is a very very tough category for us with 4 cylinder motors, dont look for too many results unless u have mucho chavo ta spend...

hybridsol · #6 10-31-2002, 08:42 AM

Quote:

Originally posted by SmoovSol
if you go with a gude all motor head the compression I believe for the sohc is 12:1, in my opinion you better always fill up on 94 octane and have an upgraded igntion, wires and all that to be safe. All motor is a very very tough category for us with 4 cylinder motors, dont look for too many results unless u have mucho chavo ta spend...

an ex sohc is 9.6:1.....? :huh: 12:1 is up there for a single overhead cam motor.

civickiller · #7 10-31-2002, 07:57 PM

yeah the ex motor is either 9.2 or 9.6, i believe. a bullfrog head doesnt up your comp ratio, strictly head tuning from what i understand

5genhbtrubo15 · #8 11-03-2002, 06:01 PM

:frog: i depends on where you live and the air density hear in oklahoma i have a freind that we are runing 12.5:1 on pump 93 oct with out a probom but we have dence air so its up to you

GSteg · #9 11-03-2002, 10:18 PM

if you live in cali, i wouldn't go over 11.5:1. 91 octane is the most we can get at the gas station. or you can run higher compression, but you will have to retard the timing. very important.

allabtimprts · #10 01-30-2003, 08:49 PM

I am working on my own stroker at the time, and to avoid knock with 92 octane you shouldnt go any higher then 11.5:1. I personally am gunna run it safe and go 11:1. I have my LS block and the stock rods with the Type R pistons. SO I'd recommend going around 11:1 just to be safe, but then again why not go for the highest possible.

crxlvr · #11 01-31-2003, 09:29 AM

whats the CR for CTR pistons, anyone know? are they 11.1:1?

mellowboy · #12 02-02-2003, 04:14 AM

Quote:

Originally posted by crxlvr
whats the CR for CTR pistons, anyone know? are they 11.1:1?

Yes on a ctr motor. B16 should be a lil higher? Like 11:4? Somewhere around there.

mellowboy · #13 02-02-2003, 04:16 AM

As for me i'm goin 13:5 cr. I'm gonna be using racing fuel and with some good tuning my car should be a good daily driver. If you don't mind using racing fuel then go 12:5 or higher to produce more power.

Jared_80 · #14 02-03-2003, 03:41 PM

According to the engineers at GM (Not that I trust them) all other factors set aside a 17:1 CR produced the most power. Unfortunetly you would have to use 126 octane (eqivlent) methanol to run that comperssion.

crxlvr · #15 02-03-2003, 05:39 PM

Quote:

Originally posted by mellowboy

Yes on a ctr motor. B16 should be a lil higher? Like 11:4? Somewhere around there.

ok thats nice for my all motor setup, what octane gas should i run, 91 or 93?

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