Posted by pete 23 on November 14, 2012 at 19:54:54 from (74.32.238.2):
In Reply to: 4 cyl Firing order posted by David G on November 14, 2012 at 19:02:47:
IH has a great explanation of the imbalance forces in a 4 cyl inline engine. I think it is in the C153 service manual, but not sure. Anyway, they go to great lengths to explain why they added the balancer shaft below crankshaft. It has to do with the fact that a piston moves a different distance in a specific degrees of crankshaft rotation at top dead center than that same piston does at bottom dead center. I have put dial indicators on pistons both top and bottom dead centers and turned crank same amount in degrees and you get a different reading. Try it sometime. Interesting.
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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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