Posted By: Von
Erson rocker shafts, Who has broke one? - 02/03/11 02:31 AM
Looking to see who( or knows somebody) who has broke an Erson rocker shaft, specifically the shafts used for the needle bearing rockers.
Im asking because I was told today by a person who probably knows as much or more as anybody about rockers (you can probably guess who), that it is a common problem with the Erson shafts. If you dont know the Erson shafts are .700 diameter. About .175 less than a standard diameter shaft. The wall thickness at the fastener location is reduced by .090ish on the top and bottom side of the fastener hole. He guessed and was correct that the shaft I have broke at the fastener locations. He suggests doing away with the needle bearings, bushing them and using standard size shafts.
I know that other mfgs use shafts diameter smaller than the stock diameter.
Wondering how common the breaking problem is
Im asking because I was told today by a person who probably knows as much or more as anybody about rockers (you can probably guess who), that it is a common problem with the Erson shafts. If you dont know the Erson shafts are .700 diameter. About .175 less than a standard diameter shaft. The wall thickness at the fastener location is reduced by .090ish on the top and bottom side of the fastener hole. He guessed and was correct that the shaft I have broke at the fastener locations. He suggests doing away with the needle bearings, bushing them and using standard size shafts.
I know that other mfgs use shafts diameter smaller than the stock diameter.
Wondering how common the breaking problem is
and somebody who actually knows rockers (RAS) 
We, ran them on the enginemaster entry , they held up fine for about 80 dyno pulls ,6700ish RPM .
Said they were on thier Third batch attempt and still were having problems with warpage and cracking.