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Author Topic:   comp ratio
the last dive
Gearhead

Posts: 147
From: sydney australia
Registered: Dec 2001

posted 04-30-2002 07:55 AM     Click Here to See the Profile for the last dive     Edit/Delete Message   Reply w/Quote
does anybody think that 10.1comp is too low for a solid flat 294 248 @.050 560lift cam??

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Moneymaker
Administrator

Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 04-30-2002 09:37 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
No.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link

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n2oMike
Gearhead

Posts: 1547
From: Spencer, WV
Registered: Jan 2001

posted 04-30-2002 12:02 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
It depends upon if you have a TRUE 10:1 compression. Be sure to take into account...

how far the pistons are down in the bore at TDC
cc's of the valve reliefs
cc's of the head gasket
truee cc of the combustion chamber

A set of '10 to 1' pistons does not necessarily give 10 to 1 compression.

One more thing, running on the 'low' side of the compression scale for a given cam, the low-end and midrange are what will suffer the most. This is especially important when using a cam that is a bit on the large side anyway... especially if it is to be used with an automatic.

Good Luck!

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Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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