Shaving a late 2F head
- Thread starter SteveH
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Except for having to buy a lot of premium fuel.
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About the MAF pistons. They are advertised as a 9:1CR at 1mm overbore.
1mm overbore on a stock engine= 8.42:1
1mm overbore, flattop piston, 1mm mill= 8.9:1
9 is the max I want to see in a Cruiser engine. Anymore will require hi-test gas, which is not always readily available in the middle of nowhere. I hafta run 91 octane in my engine that is accidentally at 9.0 (1.5 overbore, .75 mill, flatface valves). Fillups cost 10% more, for a 5% gain in power/efficiency. Not a good deal. I threw the engine together without crunching numbers and will pay extra for the next 200K miles.
Be careful with high compression pistons. Do the math before cutting any metal.
1mm overbore on a stock engine= 8.42:1
1mm overbore, flattop piston, 1mm mill= 8.9:1
9 is the max I want to see in a Cruiser engine. Anymore will require hi-test gas, which is not always readily available in the middle of nowhere. I hafta run 91 octane in my engine that is accidentally at 9.0 (1.5 overbore, .75 mill, flatface valves). Fillups cost 10% more, for a 5% gain in power/efficiency. Not a good deal. I threw the engine together without crunching numbers and will pay extra for the next 200K miles.
Be careful with high compression pistons. Do the math before cutting any metal.
Running at mainly sea level to 1000 feet with max elevations usually under 4000 I have had no problems running up to about 9.3:1 on regular fuel. If I do choose to run premium the cost difference is minimal here. under 5% Before I worry about that difference, I will be lookng at a lot of the inherent economy sacrifices that a Cruiser requires anyway.
Mark...
Mark...
What camshafts are you guys running with these compression ratios?
With my 2FE I run a Delta KC859 grind (262* I believe) and 8.8:1 static compression (7.3:1 dynamic compression) and have had it rattle on one tank of bad regular gas in Canada plus user error in Montana where I forgot that regular gas=moose piss.
- Joined
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- 11,200
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I always run the blueprint MC803 melling cam, which is very tight, making the engine rattle at 9:1
Good excuse for me to send a core to Delta to be reground and lose some compression...
Good excuse for me to send a core to Delta to be reground and lose some compression...
if your counting the difference in refueling costs between regular and premium lol you dont need to be driving a cruiser.
shaved head
I suggest you drive something other than a fj40 if you are after fuel economy.
I suggest you drive something other than a fj40 if you are after fuel economy.