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There has been a bit of talk about Crank Shaft Balance Factors on the Two Stroke Tuners thread, resulting in more heat than light. As there is a bit of a rowdy crowd over there I am going to make my posts here.
I intend to keep it simple, so for what its worth, this is our interpritation of Phill Irvings work.
Phill Irving talks about CrankShaft Balancing and Balance Factors on pages 107 to 110 of the book which can be found on page 61 of the PDF.
http://www.scribd.com/doc/15392252/T...rcycle-Engines
Anyone can open a free account with Scribed where they can download "Tuning for Speed" by Phill Irving.
"xwhatsit" is the guy who uploaded Tuning for Speed to Scribd in the first place, thanks xwhatsit.
I will use a 2-Stroke single cylinder TF100 crank to demonstrate my explanations and I need to break it down into sections as I can't cover it all in one or two posts. Thomas gave me a hand, taking the photos and gave me a few tips along the way.
My plan is to:-
(1) Post photos of all the cranks I have lying around and quickly describe the features I can see on them.
(2) Describe how to find the reciprocating weight.
(3) What the "Balance Factor" really is.
(4) I will answer this question, Which is heavier, (A) the reciprocating weight of the rod piston assembly or (B) the counter weight of the crankshaft.
(5) Why there is a "Balance Factor" and what changing it does.
(6) What to do with your "Balance Factor"
(7) A simple but very effective jig for staticaly balancing a crank, that you can make yourself in 10min's. (Thanks Thomas)
(8) What a rocking couple is, and how the term is used in crank shaft balancing.
(9) Just for Skunk, Some of the problems associated with balancing a V2 90 degree twin with one horizontal cylinder.
This is going to be a very simple "KISS" look at single cylinder crankshaft balancing, based on Phill Irvings book. If anyone thinks I've missed something or wants a more in-depth treatment they are welcome to explore the internet for what they can find. Or dust of data from their own experiments and post it themselves. Then we can all enjoy reading their interpretation of what they have learnt.
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