bbc rear main seal ??
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bbc rear main seal ??

  1. #1
    Senior Member Futs's Avatar
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    Default bbc rear main seal ??

    Is the fel pro 2918 rear main seal needed for lets say 10-12" vac? Or would the standard one be fine? I ran the standard one for 6 years with no leaks, was just wondering as I just bought the 2918 anyways.

    Just like to hear what you all have to say about it.

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    steelcomp was here
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    Quote Originally Posted by Futs View Post
    Is the fel pro 2918 rear main seal needed for lets say 10-12" vac? Or would the standard one be fine? I ran the standard one for 6 years with no leaks, was just wondering as I just bought the 2918 anyways.

    Just like to hear what you all have to say about it.
    I've been using the Detroit Viton seal since we have them in stock, equiv. to the Felpro Viton. For that much vacuum, it's probably not a bad idea.
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    Senior Member stix818's Avatar
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    Quote Originally Posted by steelcomp View Post
    I've been using the Detroit Viton seal since we have them in stock, equiv. to the Felpro Viton. For that much vacuum, it's probably not a bad idea.
    Are guys still installing these backwards with vacuum systems? I've always have just wondering if anything has changed.. Hoping to set the crank in my new combo this weekend..
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  6. #4
    gn7
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    Quote Originally Posted by stix818 View Post
    Are guys still installing these backwards with vacuum systems? I've always have just wondering if anything has changed.. Hoping to set the crank in my new combo this weekend..
    No, and I don't suggest it. The teeniest, tiniest POS gets in that seal and you have a geyser on your hands every time you shut it down. The Viton seals do a reasonably good job of holding a depression. The worst that can happen is it leaks some air and you don't hit the number you'd like to. But they hold 12" pretty well.
    If you go much below that, I suggest you use the Signal Seal, Cometic, or CV one piece seal double lip seal. I think the Signal and CV are one and the same.
    About twice the cost of the Felpro Viton, but they work.



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    Last edited by gn7; 02-05-2014 at 11:25 AM.

  7. #5
    Senior Member stix818's Avatar
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    Quote Originally Posted by gn7 View Post
    No, and I don't suggest it. The teeniest, tiniest POS gets in that seal and you have a geyser on your hands every time you shut it down. The Viton seals do a reasonably good job of holding a depression. The worst that can happen is it leaks some air and you don't hit the number you'd like to. But they hold 12" pretty well.
    If you go much below that, I suggest you use the Signal Seal, Cometic, or CV one piece seal double lip seal. I think the Signal and CV are one and the same.
    About twice the cost of the Felpro Viton, but they work.
    I'll try it the right way but we've been installing the since the early 90s without issues on all of our motors with a vac pmp.
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  8. #6
    steelcomp was here
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    Quote Originally Posted by stix818 View Post
    I'll try it the right way but we've been installing the since the early 90s without issues on all of our motors with a vac pmp.
    I'll ditto what Bob says. No need to install them backwards for 10-12" vac.
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    Senior Member stix818's Avatar
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    Thanks Steel and Bob.. I'll give it a shot.. Hoping to set the crank this weekend..
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