My question is Andrews makes a Gear drive set for twin cam's so why not gear out the counter balance like this and yes this is only a illustration of what i am trying to get across grated this is not a Harley.

http://www.dansmc.com/counterbalance2.JPG




i also emailed the same ? to Andrews products.

http://www.andrewsproducts.com/Subpa...a_question.asp

 

Cams and counter balancer are not in the same area of the motor. Do some more research.

 

let us know what Andrews say's to ya

 

Counter rotating balancers function both on their mass and their location on/in the engine. They must be placed on the same axis that the engine vibrations act on. Given where Harley Davidson has placed (and probably due to the physics of the problem had to place them) the balance shafts on the "B" engines, the distance from the crankshaft makes it extremely difficult to imagine how one might design a gear drive that would work. Not withstanding that there have been no real problems with the current chain drive for the counter balancers such as there was for the older design cam drives.

 

I personally think it has more to do with Harley's poor crankshaft issues than a design issues. Out of the 20 or so people that I ride/associate with, 7 have had to rebuild their motors due to the cranks. I also know 4 other people that have had their counter balancer gears shift on the crank. In my case, the pressed on bushing next to the gear failed, spinning on the crank and causing my gear to shift.
My counter balance assembly was fine. The issue was the crank.

 

If U run the chit out of them they probably will give U problems..Thats why theirs a rev limiter on them..

Aggressive downshifting and burn outs is hard on a B motor also.

Here is some Really good teaching on HD cranks, It explains whats going on and explains it better than I could tell Ya in here..
If U take the time to watch them U will learn why.


These links below are no longer any good (1-21-14). I am going to look and see if they can still be found. (Nope they have been removed, soon to return, as per Revolution Performance tech I just talked to)

VimeUhOh

VimeUhOh

VimeUhOh

VimeUhOh

VimeUhOh

 

+1 if I ever get into my stock motor for mods the first order of business will be getting the crank balanced, welded, polished.

 

here is the reply that Gary from Andrews sent me

I'm sure it would be possible, but would require multiple gears
and axles,
likely new cases and flywheels. May be easier to just remove the
balancers altogether at that point?

Thank you,

Gary Wallace
Technical Support

Andrews Products, Inc
431 Kingston Court
Mount Prospect, IL 60056
847-759-0190
847-759-0848 Fax
gwallace@andrewsproducts.com
www.andrewsproducts.com


if yah dont ask it wont get done you need to let these gear head shops know that your interested in somthing like this in order for them to do it.

 

yea i know i was only using that as a example

 

An example of what?