HP is a function of how much air-fuel mixture the engine will pump through it per hour. Take the 350 Chev for example with small high velocity ports, 76cc combustion chambers and a short duration cam. It will make lots of low rpm torque but mid range and peak HP will be limited. Take the same 350 shortblock with a set of Edelbrock RPM heads with 64 cc chambers and a high lift/long duration cam. Peak torque may be even equal to or even greater than the previous low speed engine's version. How ever the peak torque will occur at a higher rpm. Of course max HP will be greater and occur at higher rpms. Fuel consumption per HP per hr of the engines could be identical. Every body thinks a 400HP engine uses a lot more fuel than a 200HP engine.Well yes it does but everybody forgets the 400HP engine is performing twice the work per hour.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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