Engine balance

[rick]

Hi all

I have just started to re-assemble my 1929 350 slopper engine after some major surgery As i started to put together the two flywheels onto the new crank shaft I started to wonder if they should be balanced plus how do you know if the fly wheels are equally facing each other Any thoughts as to the right way

Rick  :-/

[L.A.B.]

Hi all

I started to wonder if they should be balanced plus how do you know if the fly wheels are equally facing each other Any thoughts as to the right way

I'm not sure if crank balancing is entirely necessary on that type of engine, although it couldn't do it any harm?

The correct way to check if the main shafts are in line is to set the crank on engineering 'V' blocks, or mount it between centres on a lathe and then check the run-out with dial gauges set against each shaft.
Checking across the flywheels with a straight edge on an engine of that age may possibly be adequate?

[rick]

thanks for the information It may be as you say just as well to get the flywheels balanced, can do any harm

[RichP]

The better aligned and balanced your components are, the sweeter it will be and the motor will have an easier life.

I don't know how similar the Sloper crank is to later BSA items but the general principles should be the same.

Henk Joore's WM20 site has a well written article by Dave Plumb. It might give you some useful pointers.

http://home.quicknet.nl/qn/prive/ahum/crankshaft%20rebuild.htm

[rick]

Once again thanks for the information, the webb site you forwarded is just excellet. it gives me all the information I need

Rick