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Viton or Silicone rear main seals SBC
Posted: Mon Nov 13, 2017 5:44 am
by RT Machine
Is there any real difference in sealing ability and longevity between Viton or Silicone [2 piece] type rear seals in a performance application ?
Viton has a higher heat rating and twice the price, but are they better ?
Re: Viton or Silicone rear main seals SBC
Posted: Mon Nov 13, 2017 6:17 am
by Sparksalot
Yes, Viton is far superior in that application.
Re: Viton or Silicone rear main seals SBC
Posted: Mon Nov 13, 2017 12:41 pm
by engineguyBill
I have always used silicon rear main seals, with excellent results. Available from many sources, but all are probably manufactured by Fel-Pro.
Re: Viton or Silicone rear main seals SBC
Posted: Wed Nov 15, 2017 5:38 pm
by A_VAS
Viton will not swell or change properties much in the presence of hot engine oils
viton has better low temperature performance, down to like -40*C.
it is far superior to silicone in those 2 areas.
raw material is about 15x the price of a regular VMQ silicone