44070dart
Well-Known Member
looking at ...440 engine 509 cam 12 to 1 compression ..street engine 93 octane or not:edgy: if race gas / octane boost I'll pass on it
440 12:1 compression 93 octane ??
- Thread starter 44070dart
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69HEMICORONETR/TCONV
Well-Known Member
Way too much Compression for Pump Fuel, even if it is 93 Octane, You would have to run Race Fuel or drop the compression ratio.:yes:
44070dart
Well-Known Member
yeah .. kind of thought that .. too bad .. thanks
68GTX4SPEED
Well-Known Member
Where is the compressionlimit at 93 octane steelhead VS aluminumhead.
69HEMICORONETR/TCONV
Well-Known Member
Safely around 9 on a cast head, about 10 on an aluminum head.
and that's considering today's crummy fuel quality.
and that's considering today's crummy fuel quality.
68GTX4SPEED
Well-Known Member
Thanks
44070dart
Well-Known Member
9:1 safe compression 93 octane premium gas $3 plus a gallon ... versus 93 octane $.35 a gallon and 10 plus : 1 in my fathers 59 dodge 4 door family car in 1967...ran like a monster weighted 2 tons . guess I'm getting old sound like MY father longing for the old days ...when it rained and the dodge wouldn't start he wished he had his 38' Old's back
dbowperson
Well-Known Member
I run 10:1 with stock steel heads with no problem. You can add about 1 point with aluminum heads. 10 is about max for steel heads, though.
dodge41969
Well-Known Member
That's waay too much compression for the street/pump gas!
and that .509 isn't a very good cam, that grind has got to be at least 40 years old!, you'd need 12:1 compression with that cam to make it work!
theres soo many better choices out there in cams.
and that .509 isn't a very good cam, that grind has got to be at least 40 years old!, you'd need 12:1 compression with that cam to make it work!
theres soo many better choices out there in cams.
696pack
Well-Known Member
That is about right IF you have a good quench motor.
george68hemirr
Well-Known Member
11.5...pump gas...aluminum block and aluminum heads
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