Quote:
Originally Posted by Railcarmover
To maximize bearing life full flow oil filtration and avoiding spark knock is important.The effect of spark knock on bearings increases with higher compression.Folks who want the power but look original with the 5.5 or 6 to 1 head and use an A distributor risk accelerated bearing wear due to detonation.One thing I'm not convinced about is the value of a counter balanced crankshaft vs the dynamic balanced crankshaft in the Model A.Does anyone have hard evidence of increased life vs cost? my gut says it doesn't pencil out..
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Some posters have mentioned timing issues with the FS auto ignition used with a high compression head. I had a similar issue because the prior owner's FS zip wouldn't allow enough retard on grades with resulting knocking. Pulled it in favor of the stock dizzy to allow for manual adjustments to suit conditions. I also have a counter balanced crank with lightened fly and V8 clutch which though not empirically tested has very smooth running.