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Re: 134 piston direction?

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Author  [Modern View]

01-21-2013 07:16:28

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Wrist pin offset is measured with a micrometer or caliper.
As a side note there has been mention of " balancing pistons" or other similar such illusions. Altho it is optimal to have all pistons weighing the same it is unnecessary for relatively slow turning engines. Ex: Some of the old prewar buicks used cast iron pistons while the only available OEM SUPPLIED replacements at THAT TIME were Al pistons. There is absolutely NO correlation between engine balancing and pistons. Pistons have absolutely nothing to do whatsoever with engine balancing. This piston 'balancing' and crank REbalanicng for piston variation is complete nonsense. Makes for great articles to sell magazines to arm chair engine experts.
Pistons are RECIPROCATING weight. NOT rotating weight.

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Jason S.

01-21-2013 15:25:14

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 Re: 134 piston direction? in reply to PackardV8, 01-21-2013 07:16:28  
How do you figure that piston weight has nothing to do with balancing an engine? The counterweights on a crank are there to balance out the weight of the rod and piston. If you change the weight of the piston does it throw the motor out of balance? Yes. The piston and top half of the rod is recipricating weight, the botttom half of the rod and the crank journal is bob weight.There is even archive footage of old John Deere 2 cylinders rotating assemblies being balanced and they don"t turn much slower than they do.

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