I'll ad to Glennster's comment. The crancks in many inline four cylinder engines are of the two up, and 2 down variety. This has no intrinsic ballance, but depends on the mass of the system to be uniform to keep vibration to a minimum. Though the actual weight of the piston is not critical (within reason), the uniformity between the pistons is very important. If the two up pistons weighed more than the two down pistons there would be pretty radical vibration. Imagine a barbell with a half pound missing from one end. Thus the use of a cast iron piston set in early engines could be as smooth as a set of aluminum pistons in a replacement set without any ballance problems, and no changes to the crank or pulleys or flywheel. JimN
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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