Max compression with regular gas?
Laughing Gas
Joined: Dec 2012
Posts: 801
Likes: 7
From: Toledo, Ohio
. Depends on cam size/spec.s, combustion chamber and piston prep., ignition curve/advance, thermostat temp., cooling capacity, usual workload, and engine quench distance... etc...
. Usually 9:1 or slightly more... lots of variables... I'd aim for 9 for efficiency's sake and do what's necessary to make it work if sticking with 87 regular... avoid the actual 7's of '72 and later engines...
. Usually 9:1 or slightly more... lots of variables... I'd aim for 9 for efficiency's sake and do what's necessary to make it work if sticking with 87 regular... avoid the actual 7's of '72 and later engines...
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Junior User
Joined: Aug 2014
Posts: 92
Likes: 1
That's where I'm having trouble. This is going on a 79' 2wd that will be used as a daily driver and to occasionally pull a trailer (around 3-5 thousand pounds, 3-4 times per year) I want a strong motor that can run on the cheap gas. I'll be running an Edelbrock 2171 intake with a street demon 625 carb, just haven't decided exactly how I want to build the motor from here.
Moderator
Joined: Aug 2002
Posts: 6,099
Likes: 380
From: Southern California
Agree with all the above......
Back in the day of when lower octane 1st hit, Crower had a series of grinds that would allow up to a 11:1 CR and not exceed 150 psi.....of course with all the right parts.......
Back in the day of when lower octane 1st hit, Crower had a series of grinds that would allow up to a 11:1 CR and not exceed 150 psi.....of course with all the right parts.......
Laughing Gas
Joined: Dec 2012
Posts: 801
Likes: 7
From: Toledo, Ohio
. Geez... gas still dropping here in the new year... $1.59 now... gotta get that 400 built so I can put some serious amount of gas through it...
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FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Amen, brother! My 400 is begging for life!
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