Ok, i'm going to do some headwork and also different pistons. But whats the best compression ratio for my B18c6 when i'm gonna install the toda B cams?
I want to make a quench style head like port flow does, and pollish the ports as well.


This is what I got now,
Injen CAI,
HKS 4-1 header
Testpipe
HKS Hipower catback

 

I would say higher is better. I plan on swaping some CTR pistons one of these years which gives you a little over 11.5 to 1 I believe.

 

Yes, higher is better. But what would be "to much"? and what will be enough?
12:1?
13:1?
14:1? (!)

 

High 11's (~11.8 or so) to low 12's. Anything higher than 12.5 would be Toda C territory.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EVIL_EKology &raquo;</TD></TR><TR><TD CLASS="quote">High 11's (~11.8 or so) to low 12's. Anything higher than 12.5 would be Toda C territory.</TD></TR></TABLE>

I am in agreement with EVIL&gt;

 

And anything higher then a 13.5:1 is usually race gas territory

 

I have 11.5:1 and use 93. It runs great.

 

ctr pistons in a b18c5 will yield slightly over 12:1

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RJL &raquo;</TD></TR><TR><TD CLASS="quote">ctr pistons in a b18c5 will yield slightly over 12:1</TD></TR></TABLE>

most cost effective way to go too
since you are in europe, what is the highest octane/RON gas available?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GudeH23a &raquo;</TD></TR><TR><TD CLASS="quote">And anything higher then a 13.5:1 is usually race gas territory </TD></TR></TABLE>
i think anything 12:5.1 and above is race gas territory

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JUN.R &raquo;</TD></TR><TR><TD CLASS="quote">
i think anything 12:5.1 and above is race gas territory</TD></TR></TABLE>

Personally, I agree with you... But I figured if I said 12.5 to 13:1 it would attract some stupid *** comment from someone who wants to disagree. So i made it 13.5:1 so if anyone did disagree they looked twice as stupid

 

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JUN.R &raquo;</TD></TR><TR><TD CLASS="quote">
i think anything 12:5.1 and above is race gas territory</TD></TR></TABLE>

I'm running Toda B's with 12.5:1 compression (212 whp/144 tq on B18C5 81.5mm bore piston, stock stroke).

It will pre-ignite/ping a lot until you get the motor tuned (ask me how I know)

But once it is tuned - you can use 94 easily and 91 if you're just tooling around town.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Big Phat R &raquo;</TD></TR><TR><TD CLASS="quote">

I'm running Toda B's with 12.5:1 compression (212 whp/144 tq on B18C5 81.5mm bore piston, stock stroke).

It will pre-ignite/ping a lot until you get the motor tuned (ask me how I know)

But once it is tuned - you can use 94 easily and 91 if you're just tooling around town.</TD></TR></TABLE>

I would've gone higher compression but I plan on running nitrous w/ the toda's. My friend is running 150shot on his skunk2 stage 2's and he is running 11's untuned shooting fire down the track-lol.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RJL &raquo;</TD></TR><TR><TD CLASS="quote">ctr pistons in a b18c5 will yield slightly over 12:1</TD></TR></TABLE>

better check those clearances with the B's and CTR 's. You will have to advance that intake cam, most likely, a few degrees. just be cautious.
some b16 pistons(jdm or usdm) in that block should also give you around 11.3 + a mugen headgasket and your in safe but good compression for the B's around 11.8/1 .
Its also a good way to stay right under 12./1 CR., 93 octane and timing friendly





Modified by 1meanB18c5civic at 12:59 AM 1/1/2004

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Big Phat R &raquo;</TD></TR><TR><TD CLASS="quote">

I'm running Toda B's with 12.5:1 compression (212 whp/144 tq on B18C5 81.5mm bore piston, stock stroke).

It will pre-ignite/ping a lot until you get the motor tuned (ask me how I know)

But once it is tuned - you can use 94 easily and 91 if you're just tooling around town.</TD></TR></TABLE>
yeah that's fine and dandy, but who says it's good to do so? higher compresion, higher octane. period.

i can run 87 all day long with my 12:6.1. won't last long, and i'd be an idiot for doing so, but i can do it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JUN.R &raquo;</TD></TR><TR><TD CLASS="quote">
yeah that's fine and dandy, but who says it's good to do so? higher compresion, higher octane. period.

i can run 87 all day long with my 12:6.1. won't last long, and i'd be an idiot for doing so, but i can do it</TD></TR></TABLE>

I would put 100 in my car all the time if I could get it.

Damn Yankee gas stations in the NW only sell 91.

I can get 94 octane in Canada

 

damn, there has to be something around that sells race fuels. when i had my turbo CRX i always used 116 octane from TRICK. i always got discounts from them since i've been buying fuel from them for like 20+ years now from back when i raced motocross. ask around local shops to see where they get thiers or know of any places.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EVIL_EKology &raquo;</TD></TR><TR><TD CLASS="quote">High 11's (~11.8 or so) to low 12's. Anything higher than 12.5 would be Toda C territory.</TD></TR></TABLE>


Toda C territory? This is BAD logic.
compression depends on availability of high octane fuel and the ability of your tuner.
Has very little to do with cam selection.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sgT &raquo;</TD></TR><TR><TD CLASS="quote">


Toda C territory? This is BAD logic.
compression depends on availability of high octane fuel and the ability of your tuner.
Has very little to do with cam selection.</TD></TR></TABLE>
exactly

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sgT &raquo;</TD></TR><TR><TD CLASS="quote">
compression depends on availability of high octane fuel and the ability of your tuner.</TD></TR></TABLE>

the gas station right down the street from me sells 110. i haven't found out if it's "at the pump" or special request???

 

12.5:1 or higher is ideal for spec c
so maybe between 11.0:1 -12.0:1 would be ideal for spec b

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ITR764 &raquo;</TD></TR><TR><TD CLASS="quote">

the gas station right down the street from me sells 110. i haven't found out if it's "at the pump" or special request??? </TD></TR></TABLE>
!!!dayamn, awsome

 

Ok, thanks!

Here in holland we drive 95 or 98 octane fuel. I always run 98. How high can my comp ratio be with this kind of fuel?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Big Phat R &raquo;</TD></TR><TR><TD CLASS="quote">

I'm running Toda B's with 12.5:1 compression (212 whp/144 tq on B18C5 81.5mm bore piston, stock stroke).

It will pre-ignite/ping a lot until you get the motor tuned (ask me how I know)

But once it is tuned - you can use 94 easily and 91 if you're just tooling around town.</TD></TR></TABLE>

How do you know?