Engine balancing

[mteezey]

Anyone have any diy methods of engine balancing. I definitely need to get my build off motor balanced but have a couple Briggs that are built up pretty big that need it to. Don't really wanna send em all out if I can build something to do it on my own. I'm from Detroit area if anyone knows anyone local that's reasonable on prices to have it done.

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[ATKRIDER]

I am going to do a balance job on a Tecumseh HS40. It will be on an engine I am doing for a member here. It is under "Project Logs" titled Speedway Mini Cycle. The balancing part should be up around Wednesday of next week. It is defiantly going to be a DIY but is using a tried and true technique that you can do for minimal expense. Bill Kraft

 

[mteezey]

Cool thanks looking forward to checking it out.

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[Norcalputput]

You can do single cylinder engines with simple tools a scale and a lot of math there is a lot of info on single cylinder engine balancing if you google it there is a 2hr video lecture on the web I will try to find the link but again if you are not very strong in math I would pay to have it done but if you got a A+ or a strong B in calculus and trig go for it


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[ole4]

not so much math as knowing what the balance factor is. You also will need a fixture to set the crank in that is friction free (as much as can be) I have a fixture with knife edge ballbearing rollers. you also need to make a bob weight one you calculate the correct amount of weight. I gave up on this when I realized the best way to reduce vibration of a single cylinder engine is to use the lightest reciprocating weight possible. Get the lightest pin, piston. You also need to weight the small half of the connecting rod and the big half. Formula is 100% of bigend * (balance factor*(small rod end, piston, piston pin, rings, circlips)) The balance factor moves the primary imbalance around the horizontal and vertical planes. There is no way to get a perfect balance on a single cylinder engine and the heavier the reciprocating weight the greater the primary imbalance.