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 - Fabrication (Who Me? Make it myself?) - by Chris Pratt. First of all, what are the reasons for not fabricatin your own parts? Most judgements on what should be purchased rather than fabricated stem from: Originality - If the tractor restoration is to be 100% original, it is likely that you should spend the time and money to locate the component in the used or New-old-stock market. Since this can be extremely difficult, you may want to fabricate the item or purchase a modern replacement temporarily, but eventually, you s
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