RE: 10.5:1 compression ratio

[Terry Rudd]

10.5:1 will run on 96 or 98 octane with 36 deg total advance as long as the cam is 66 deg or more. Compression pressure of around 175-180 psi  @ 350 rpm seems to be about the limit of LRP with around 10% higher with Optimax.  200 psi at sea level on a 40 degree day going up a steep hill will test it out.

 

regards

Terry

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Duncan Shillito
Sent: Thursday, 22 November 2001 8:45 PM
To: [EMAIL PROTECTED]
Subject: Re: 10.5:1 compression ratio

good question....

i'm about to put my l20b stroker back together.......

estimated compression ratio 10.5:1 (583.5cc swept volume, 42cc head, 10.5cc pistons, 9 cc gasket

i'm also worried that even with a re-graphed dizzy (max 36deg advance) it will ping and anoy the crap out of me.......

i'm hoping 98 optimax will do the trick.

 

dunc.

>From: "Tony Bryant" <[EMAIL PROTECTED]>

>Reply-To: [EMAIL PROTECTED]

>To: <[EMAIL PROTECTED]>

>Subject: Re: 10.5:1 compression ratio

>Date: Thu, 22 Nov 2001 11:11:33 +1300

>

>I run my 10.5:1 L17 on 96 unleaded without detectable knocking.

>

>----- Original Message -----

>From: "Justin Friedrichs" <[EMAIL PROTECTED]>

>To: <[EMAIL PROTECTED]>

>Sent: Thursday, November 22, 2001 10:48 AM

>Subject: 10.5:1 compression ratio

>

>

> >

> > Morning Listers,

> > Would a race 10.5:1 CR L18 motor be able to run on 98 octane premo

> > unleaded??

> > Just for interest what CR is it necessary for a donk to run on

> > AVGAS??

>

>

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