Additionally a car doesn't often need to run for a long time producing it's full rated power, except maybe a car in Germany or one that is racing. I always thought a lot of the low RPMs on tractor motors was so they could run at their rated power/RPM for hours on end without self destructing. Look at the evolution of gasoline tractors in the 50's and early 60's. Often the New model was the same basic engine as the previous model but had been tweaked to run at a higher RPM. We had a late model A John Deere, the engine in it was actually a little smaller displacement than the neighbor's model 60 but their 60 ran a but more RPMs. Look at Farmalls, what was the model H evolved into a 3 plow tractor while what was the the model C became a 2 plow tractor. More power, less displacement and more RPMs and gears. The 5.7 Hemi in my Ram truck makes horsepower and torque similar to the big block engines of my youth, but if I stomp on my Ram to pass something that tach jumps up to 4,000 RPMs or more pretty quick, it was a much longer journey to see 4,000 rpms in a Buick or Oldsmobile 455.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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