Piston Ring ?
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Piston Ring ?

  1. #1
    Member phil369's Avatar
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    Default Piston Ring ?

    At what point do you need to run a vacuum pump ? Building a 468, 11-1 comp., 049 heads, 6.385 eagle rods, forged gm crank, looking at Mahle rings, they list low medium & standard rings, would I need a vacuum pump for a 15 lb. oil ring. Trying to free up friction but at same time want to stay away from added cost of the vacuum pump. Also building a 496 a after this build, wanting to go pro charger with a blow through dominator on the 496 , so trying to save a little coin for the big motor. thanks, Phil

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  3. #2
    gn7
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    Quote Originally Posted by phil369 View Post
    At what point do you need to run a vacuum pump ? Building a 468, 11-1 comp., 049 heads, 6.385 eagle rods, forged gm crank, looking at Mahle rings, they list low medium & standard rings, would I need a vacuum pump for a 15 lb. oil ring. Trying to free up friction but at same time want to stay away from added cost of the vacuum pump. Also building a 496 a after this build, wanting to go pro charger with a blow through dominator on the 496 , so trying to save a little coin for the big motor. thanks, Phil
    Brand new late model cars are running 3 MM oil rings and no vacuum pump.
    I would run a exhaust e-vac for sure. If not, then you need to consider standard rings.



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    Senior Member MACHINEHEAD1's Avatar
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    15LBS seems OK for 4.31 bore @ WOT. +1 on pan-e-vac.

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  6. #4
    Senior Member jimclauss's Avatar
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    Quote Originally Posted by gn7 View Post
    Brand new late model cars are running 3 MM oil rings and no vacuum pump.
    I would run a exhaust e-vac for sure. If not, then you need to consider standard rings.
    1;ve seem 25 hp gain on the dyno with exhaust E vac

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