Performance Upgrade while Head's Off

[JShadzi at aol.com]

Nice, that outta do it, I used a java calculator once that gave me closer to 8:1, but it all depends on measurements, I used a 1.6mm gasket thickness.

Javad

>How about 7.4:1
>
>As I recall the 7A has a 46 cc combustion chamber, add to that the 16.1
>cc in the piston & gasket then divide by the displacement of one
>cylinder  62.1/461.2 = 7.426
>
>The 16.1 can be derived from the total combustion volume of a cylinder
>in the NG of 46.12 - 30 cc chamber volume.
>
>Bruce
>
>-----Original Message-----
>From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com] On
>Behalf Of Jim Green
>Sent: Wednesday, October 01, 2003 9:41 AM
>To: Todd Phenneger; Alan Pritchard; 'tihol tiholov';
>quattro at audifans.com
>Subject: RE: Performance Upgrade while Head's Off
>
>
>--- Todd Phenneger <tquattroguy at yahoo.com> wrote:
>> Hmmm,
>>  Id be curious to know exactly what the CR would be.
>>  Can anyone
>> that knows the Volume of the head COmbustion
>> chambers calculate
>> it.
>>   Javad?!?!
>> l8r
>>   Todd
>>
>> --- Alan Pritchard <apritchard at seaeye.com> wrote:
>> > Rumour has it that it does, although no one has
>> ever properly
>> > confirmed it.
>> > But what you will end up with is a ridiculously
>> low
>> > compression ratio, like
>> > 6:1 so any performance gains from the multivalve
>> head will be
>> > lost by the
>> > cr...
>
>We've been through this before, I think it actually
>works out to ~8.5:1 or something.  Whatever it was, I
>remember that it was pretty good for a turbo motor.
>That 6:1 CR is what you'd get with a 20vt head on an
>MC block.  Good if you want to run 30 psi of boost....
>
>=====
>Jim Green
>'89 90tq 034EFI Stage II
>http://www.mswanson.com/~jgreen/car_home.html
>
>
>
>