I have a vibration issue with my 427 winsor stroker. It vibrates quite a lot all through the rpm range. Although the crank, balancer and flywheel balance should match (see below), I suspect (fear) that it’s crank imbalance. Could it be something else?
According to the engine build sheets it has an RPM 4340 steel crank that is external balance: DG3-351WDE FORD 351W 4340 NITRIDE 4.17" STROKE, EXT.BALANCE .
The harmonic balancer is a pioneer, also 28 oz external balance: PIO-872008PHARMONIC BALANCER, EXTERNAL BALANCE 28 OZ, NODULAR IRON, FORD, 302, 351W
It was originally delivered with an RPM billet steel external balance flywheel: FPH-30228 RPM, FORD 302 157T W/28OZ WEIGHT EXTERNAL BALANCE.
The rotating assembly was balanced at the shop and the engine dyno’ed at 525 HP at 5400 RPM.
After I received the engine I replaced the steel flywheel with an Fidanza aluminum 164 tooth flywheel, to which I bolted the 28.8 oz external weights (you can chose between no weights, 28.8 and 50 oz external weight):FIDANZA FIZ-186511 billet aluminum flywheel 164-tooth, NOT FOR LATE MODEL APPLICATIONS WITH A 157 TOOTH RING GEAR. includes 28 oz. and 50 oz. weights.
Any thoughts and feedback is really appreciated.
Kristian
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