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  '64 1/2 to '73 -- The Classic Mustang
  octane and compression...?

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Author Topic:   octane and compression...?
MDF99
Gearhead

Posts: 201
From: Hamilton, Ohio, USA
Registered: May 2001

posted 11-19-2001 01:29 PM     Click Here to See the Profile for MDF99   Click Here to Email MDF99     Edit/Delete Message   Reply w/Quote
With 93 or 94 octane pump gas, what's the highest compression ratio that you can comfortably use?

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steve'66
Gearhead

Posts: 6602
From: Sonoma,CA,USA
Registered: Mar 2000

posted 11-19-2001 02:14 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Depends on Cam specs, timing, type of head, etc. But a general guideline is 10-1 with cast iron heads and 10.5-1 with aluminum heads. The wilder the cam the higher compression you can run.

SteveW

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Mpcoluv
Gearhead

Posts: 975
From: Charlotte NC usa
Registered: Apr 2001

posted 11-19-2001 02:38 PM     Click Here to See the Profile for Mpcoluv   Click Here to Email Mpcoluv     Edit/Delete Message   Reply w/Quote
I'm barely able to run 10.4:1 with my 372C with quench 4V heads. If I had it to do over, I'd stick with 10.00:1.
Aluminum heads allow for 1/2 to 1 full point more of compression.

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JAAZZY
Gearhead

Posts: 745
From: Bay Area, CA
Registered: Apr 2001

posted 11-19-2001 04:00 PM     Click Here to See the Profile for JAAZZY     Edit/Delete Message   Reply w/Quote
I'm running 10.5-1 with aluminum heads with no problems on 91 octane. I think I could easily run 11-1 on 93.

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