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What compression does your worked N/A engine have

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Camo Custom Title Time!

1,936 posts · joined Oct 2007 ·

#898912
Hi all,

firstly, I am not after your compression ratio at all.

I am just curious as to what compression your modified N/A engine may have, non turbo engine of course.

Mine has an average of 175psi.

Thanks, Kevin
I thought rebuilding a VW would be cheap - Shit I was wrong, just don't let the wife know !!!!

Click here for my (slowy) modded 1961 Beetle build.

dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 ·

#899051
Mine has 200.
You can advance and retard the cam and
note significant changes in the cranking compression.

Naturally a smaller duration cam, or more static compression will increase the number.

I always remember Mick Atholwood (RIP) used to say a good rule of thumb
for a drag engine was to adjust the cam duration and position to aim for 200 psi.

Just for comparison, and peoples interest, my old supercharged 1715cc engine with low 7:1 comp,
and large duration cam only had 100 to 110psi.
westi wrote:That's mad Alan.

Camo Custom Title Time!

1,936 posts · joined Oct 2007 ·

#899094
Thanks Dave for your input.

Gives me something to compare to and for others 👍

Any idea what your compression ratio was with the 200psi?

Cheers, Kev
I thought rebuilding a VW would be cheap - Shit I was wrong, just don't let the wife know !!!!

Click here for my (slowy) modded 1961 Beetle build.

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 ·

#899111
Kev, your compression is fine 👍

What was the lowest and highest ?


waveman1500 Also rides a Honda

1,346 posts · joined Dec 2009 ·

#899181
My old 1500 single-port had 100psi in #1,2 and 4 and 70psi in #3. That thing had definitely been worked, very hard for about 40 years! 😂 Just for comparison. It still ran on all four just fine and I got it up to an indicated 86mph on a straight bit of road. Admittedly, it was slightly downhill! That was in a 1970 Beetle.
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Sandy Officially Full-On Dubber

254 posts · joined Apr 2005 ·

#899219
My 1835 has about 140 psi