Re: [T3] Compression Ratio Recommendations

["John Connolly" <john@aircooled.net>]

<x-charset iso-8859-1>exactly what is "high" for CR? What is "low"?

If the ignition timing isn't matched to what the engine wants, the engine
will not run it's best. If the engine want's 20 degrees, give it 20 degrees.
If it wants 40 degrees give it 40 degrees.

I'll only say that you have to match the CR to the cam and application you
are using, across the board recommendations are worthless, unless they take
into account the overlap and duration, and the vehicle the engine is running
in. It's WAY more complex then it appears. A 2275cc engine with small
chambers and tight deck will need a lot less timing then the same engine
(even with the same cam) with a huge chamber and loose deck, or semi hemi,
for example, yet they have the same cam and engine size.

John
Aircooled.Net Inc.

----- Original Message -----
From: "Keith Park" <topnotch@nycap.rr.com>
To: <type3@vwtype3.org>
Sent: Sunday, June 16, 2002 11:42 AM
Subject: Re: [T3] Compression Ratio Recommendations


> All Ive read says its high CR that makes the engines run hot.. and that
has
> been my findings with my motors over the years.  I backed the timing off
on
> my high CR whitney motor years ago so I could still run with pump gas, but
> that reduced the gas mileage considerably.
>
> Keith
>
>
>
>
> > so back out the timing! There's nothing wrong with running less ignition
> > timing to get a proper burn, if you have more CR. Some of our engines
run
> > full advance of 18 degrees! That "30-32 degrees total timing" is
hogwosh,
> it
> > all depends on the engine.
>
>
>
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