More Timing Or More compression = More Power
10-16-2009, 05:03 PM
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More Timing Or More compression = More Power Like what it says in the title which in general will yield more power?
I'm building new combo and trying to decide what compression ratio to go with. 12:1 Sounds great with our 95 Octane
It's N/A street combo and might add 150 shot.
which one and why? Any suggestions recommendations?
Thanks
I'm building new combo and trying to decide what compression ratio to go with. 12:1 Sounds great with our 95 Octane
It's N/A street combo and might add 150 shot.
which one and why? Any suggestions recommendations?
Thanks
10-21-2009, 08:10 AM
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depends mostly on cranking compression. If its low advance the cam or raise comp. Compression is free horsepower. If you are running to much timing, obviously your combustion chamber isn't doing much work to effectively create combustion or effecient burn lol. On the other hand if the comp is to high the chamber is to efficient(so to speak) and you can experience negative torque and this can be recognised from running to little timing. It is starting to run like a diesel and knocking will occur. So if you are running around 220psi cranking compression your on the money, If not seriously raise it or advance the cam a couple of degrees. Also start with a flat timing table and work up find where peak torque is and work the table from there. Sometimes peak torque may occur 4 degrees before knock and 1 deg less then knock may induce a torque loss. So its not about how much timing you have but how efficient the chamber is and how much timing it needs not what you think it needs.
10-21-2009, 12:49 PM
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In general more compression will make more power. Most guys run too much timing to begin with IMHO. Too much timing creates more heat and cylinder pressure. I agree with the sponsor a correct tune does wonders with 12.1 compression.
Good Luck!
Good Luck!
10-21-2009, 03:10 PM
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Compression! It not only adds power it adds efficiency. I gained 1 MPG by changing from 11:1 to 11.8:1. My timing did not change, still no KR with as much timing as the LS7 engine wants. Also, I am running on 91 octane fuel (the best we can get at 5,000' altitude). Altitude and high overlap cams lessen the need for octane.
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