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What is The Point of Low Compression Engines?

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Baz

02-14-2003 05:01:23




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What are the benefits of low compression? I am sure all low compression tractors eg TVO produced less power for given capacity even when running gas?
Does this work with diesels as well?
Thanks for you help.




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G-MAN

02-18-2003 10:42:10




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 Re: What is The Point of Low Compression Engines? in reply to Baz, 02-14-2003 05:01:23  
The low compression engines used in old tractors allowed the operators to run kerosense, distillate or tractor fuel, which was cheaper and easier to obtain than gasoline way back when, as well as being lower octane. Although the compression ratios are lower, those types of fuels contain more BTUs per gallon than gasoline, so power output was comparable to a gasoline engine of the same displacent running slightly higher compression. Running more octane than your compression ratio demands will not increase horsepower and may actually decrease it. Some of the old tractor-fuel tractors will produce less horsepower on gasoline than they did running the fuels they were designed for. High-performance engines that are supercharged run lower compression because the boost created by the blower can increase cylinder pressure to the point of causing pre-ignition and detonation even with higher octane fuels. The same is true with nitrous oxide, as it contains more oxygen and allows more fuel to be burned, which once again can push cylinder pressures too high. It's a balancing act.

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smoker

02-14-2003 05:58:53




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 Re: What is The Point of Low Compression Engines? in reply to Baz, 02-14-2003 05:01:23  
The only benefit of low compression on a diesel is if it is turbocharged or you are going to charge it. It allows more volume for air and fuel. The only benefit on a gas would be the advantage of using lower octane.



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