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 - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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