trev
I'm not entirely sure but i believe its around 9.5:1
I had to get another 5thou off the head recently when i did the engine
rebuild and i didn't bother to check CR..
One thing i have noticed is that it really runs so much better on optimax.
it idles better (800rpm with a 76 cam) and pulls smoother right thru the rev
range.. That LRP is really shitty fuel i reckon...
cheers
Mick
----- Original Message -----
From: "Pooley, Trevor" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, March 16, 2001 4:09 PM
Subject: RE: COMPRESSION RATIO or cranking pressure
> Mick,
>
> Roughly what is your static compression ratio?
> I am thinking of going to around 10:1. I run optimax 98 octane. Maybe I
> could go higher?
>
>
> Bruce,
>
> [Have you tried to put some oil into the cylinders,
> (can't remember how much)and re-measure your
> compression, this should tell you if the rings are
> worn.]
>
> Haven't done this, my engine came out of a 40,000km country driven B'bird
> from my local Pick apart. With the head off there was no lip or scuff mark
> etc in the bores. So I expect that its all in fairly good nick.
>
> Regards
>
> Trev
>
>
>
> -----Original Message-----
> From: Mick Ralph [mailto:[EMAIL PROTECTED]]
> Sent: Friday, 16 March 2001 14:23
> To: [EMAIL PROTECTED]
> Subject: Re: COMPRESSION RATIO or cranking pressure
>
>
> Justin
>
> we are talking about cranking pressure not compression ratio.
> when u crank the engine over the valves open and shut and depending on the
> overlap of the cam the pressure will change regardless off valve sizes
and
> stuff
> BTW trev my L20 has big valves and a 76 cam and i get similar cranking
> pressure as you. and i have just done rings and bearings...
> cheers
> Mick
>
> ----- Original Message -----
> From: "Justin Friedrichs" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Friday, March 16, 2001 12:49 PM
> Subject: COMPRESSION RATIO
>
>
> >
> >
> > HI LIST
> > Why would the compression ratio change with a different cam?
> > Isn't the CR measured when the valves are closed, so the cam shouldn't
> make
> > any difference. The only way I could see a different pressure reading
> would
> > be if the cam was opening one of the valves. But I spose the pressure
> would
> > be zero.
> >
> > Justin
> >
> >
>
>
>
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