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Buell Forum » 1125R Superbike Board » Archives 001 » Archive through November 29, 2007 » Balance shaft removal « Previous Next »

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Microchop
Posted on Saturday, July 14, 2007 - 01:59 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I wouldn't do it (but then I am not planning on picking up one of these beauties for a long time) but has anyone touched on the idea of removing the balance shafts for less weight and parasitic drag (a FOR RACING ONLY mod, I would suspect.) I know in the import drag racing world they do this, but I also know it is detrimental to the life of the engine.
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Peterr
Posted on Saturday, July 14, 2007 - 07:28 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The Superbike Aprilias ran without balance shafts when Corser was racing them, and seemed reliable, but vibed a fair bit. Then again, these engines did 300 km before being changed or overhauled....
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Donutclub
Posted on Saturday, July 14, 2007 - 08:30 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'd suggest keeping the balancing shaft.......just skip breakfast if your that worried about the additional weight.

Syar
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Hughlysses
Posted on Saturday, July 14, 2007 - 09:33 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'd suggest keeping the balancing shaft.......

There are actually 3 of them, but dieting is probably an easier fix.
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M1combat
Posted on Saturday, July 14, 2007 - 05:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Not if you're trying to reduce rotating mass.
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Diablobrian
Posted on Sunday, July 15, 2007 - 12:44 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'm sure that when these bikes are built into track bikes the tuners will remove the balance shafts. I do NOT recommend
doing so on a street bike. The service life of a race engine is measured in hours or minutes, where the service life of a
street motor has to be measured in years or thousands of miles before tear down and re-build, and comfort matters.

The goals are 180 degrees out of synch.
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M1combat
Posted on Sunday, July 15, 2007 - 01:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

And apparently the reduced vibrations from the engine allowed the frame to be constructed differently. It may not even be a good idea for an endurance race.
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