Quote:
Originally Posted by James Rogers
Back in the day crankshafts were reconditioned by scraping with a machine in the car using the starter for rotation. This was accepted practice and done regularly. Crankshaft grinders became more popular because they produced a better and more acceptable, longer lasting finish on the journals. This is the same with reamers and kingpins. Reamers do an acceptable job for the short run and to get the car out of the shop or to get it on the road but will not last. Honing leaves a much more polished finish that won't wear in the short term. If you want a lasting job that performs like it should, have them honed to fit. This is also the same theory that is used for the wrist pins and bushings.
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James,The method you describe was used as a repair when one or two rod journals needed regrinding, not the whole crankshaft
Why do the manufacturers ream bushings? Do you think they were honed originally in 1928?
Reaming or honing either one will produce an acceptable finish depending on the skill of the person operating the tool.
Wristpin and kingpin bushings have been reamed at the factories for years with excellent results.
Continental aircraft engine wristpin bushings are still reamed and they don't clatter and last the full time between overhauls
Their is a lot of difference between a precision reamer and a straight bladed adjustable reamer same as their is a difference between a precision hone and a handheld hone. The results of either are only as good as the operator. Bill