Balance Factor/Crankshaft Balancing
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Addicted
1980 P200E project, 2005 Stella Malossi 166 MKIII
Joined: 20 Jul 2018
Posts: 968
Location: Staten Island, NY
Wed Sep 04, 2019 6:33 pm quote
Just stumbled upon these videos on youtube. Found the topic interesting and figured someone might consider this useful here.

https://www.youtube.com/watch?v=0hoE_MuFpPI

I'm assuming if your balance factor is off, you either drill out some weight from the crankshaft, or add some as he does in this video:

https://www.youtube.com/watch?v=iD6CUe5PlHo
Addicted
1980 P200E project, 2005 Stella Malossi 166 MKIII
Joined: 20 Jul 2018
Posts: 968
Location: Staten Island, NY
Wed Sep 04, 2019 6:43 pm quote
and as always, FMP with a solid video on this topic.

https://www.youtube.com/watch?v=rpq_VmmPHfg
Molto Verboso
Joined: 26 Oct 2015
Posts: 1635

Wed Sep 04, 2019 11:10 pm quote
When I had my stock T5 crank rebuilt (machined, flowed, polished, weld added, and the pin welded), I had to bring in my clutch and flywheel because my tuner wanted to weigh them in order to get the balance factor correct all of the aftermarket parts I was using. I think he aimed for around 6500 to 7000 RPMs for when the crank would produce the least amount of vibration? Maybe it was at a higher RPM? Nevertheless, when I got to the real high RPMs (9k+), that motor with that crank was just about vibration free. Since a Smallframe (and Lambrettas) doesn't have a heavy clutch hanging off the crank, the balance factor would be different from a P range.
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