DOOE heads

If you don't change your harmonic balancer then you cannot adjust your flywheel to match a newer flywheel you have to instead adjust your flywheel to some third configuration which could only be determined by spinning with the crank new crank and old harmonic damper together. For the 17 bucks for the new style harmonic damper I found it easier to just upgrade it and make the flywheel match, then if I ever had a problem with the old flywheel (not likely) I could just upgrade it to a new style (28oz) flywheel without rebalancing. Of course you could always change the HB in the future if you need a new flywheel.    The point is they switched the balance back in about 81 roughly corresponding to the time they switched from a one piece to a two peice but not exactly and the HB Crank and Flywheel all need to match or be professionally balanced in order for them to work. If you find a 28oz stroker kit then you don't need to change either the flywheel or the balancer.

I've read this 3 times and I'm still lost, I think. What I get out of it is that either the dampner has to match the flywheel or the whole a$$embly has to be balanced. But there is no performance advantage of one weight flywheel over the other. Correcto mundo?

Its not actually the wieght of the flywheel that the 28oz and 50oz refers to, its how much out of balance the internal rotating parts are by design (and I believe its really in/oz). Depending on how out of balance they are you need to have flywheels and harmonic dampers that are appropriately out of balance in the other direction to balance out the whole deal when it is all bolted together.

If your buying stock parts and not having the a$$embly balanced then you need to buy a matching set of all three,

In my case buy two of the three (crank and HB) in my case and have the flywheel changed by removing metal from it in the right spot so it matches a stock flywheels balance.

Or in the boat dr's case leave the damper alone, match it with the opposite crank and then take enough material out of the flywheel to balance the whole a$$embly, but to do that you actually have to balance the whole a$$embly.


(This is all really balance only in so much as if all the parts are within spec your vibration will be within spec at a certain max rpm but each engine will still have some imbalance unless professionally balanced)

Just for clarity there are 28oz and 50oz Harmonic Dampers and in general when swithing from one crank to another they should be changed unless your having the a$$embly professionally balanced

Joe just talked to my machinist that balanced my a$$y,the flywheel i sent him was an older 50 oz. the drilling he did was to make it a 28 oz. when balanceing a new stoker he likes to have both flywheel and balancer off the old motor .......boat dr