What’s the Disadvantage?
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What’s the Disadvantage?

  1. #1
    Senior Member Kylemenz1's Avatar
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    Default What’s the Disadvantage?

    What’s the disadvantage of the old “Mega Blowers?” I have a 420 Mega Blower and it seem to make boost ok. Why don’t they make them any more? What makes a 71 series blower better?

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    cb1
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    i think your blower has 2 lobes insted of the 71 have three i could be wrong

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    Quote Originally Posted by Kylemenz1 View Post
    What’s the disadvantage of the old “Mega Blowers?” I have a 420 Mega Blower and it seem to make boost ok. Why don’t they make them any more? What makes a 71 series blower better?
    the "old" blowers with B&M on them used a serpentine belt set-up (12 or 16 rib), while the newer one's with Holley's name on them used a 8mm drive set-up (Holley bought out B&M) which gives them more ways to go as far as boost goes...i'm told they are between a 6-71 & 8-71...i believe the old one's (serpentine belt) can be converted to 8mm...not sure if they make them anymore, but, they are out there...they make "good" power when used with an intercooler...i have a NIB with IC that i'm gonna put on a 496" BBC

    what size carbs are u running?

    what size is the motor?

    what kind of heads?

    what kind of boat?


    FastRat

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    Senior Member VDRIVERACING's Avatar
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    71 blowers are far more cool

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    Senior Member bruddah's Avatar
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    Quote Originally Posted by FastRat View Post
    the "old" blowers with B&M on them used a serpentine belt set-up (12 or 16 rib), while the newer one's with Holley's name on them used a 8mm drive set-up (Holley bought out B&M) which gives them more ways to go as far as boost goes...i'm told they are between a 6-71 & 8-71...i believe the old one's (serpentine belt) can be converted to 8mm...not sure if they make them anymore, but, they are out there...they make "good" power when used with an intercooler...i have a NIB with IC that i'm gonna put on a 496" BBC

    what size carbs are u running?

    what size is the motor?

    what kind of heads?

    what kind of boat?


    FastRat
    his motor is a merc 525 sc that he took the stock 177 blower off of and put on the 420, he also recently added a teague superchiller... carbs are dual holley blower carbs 750 or 850s? and the boats a carrera 257.... he can fill in the rest! ha

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    Senior Member Kylemenz1's Avatar
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    Bruddah is by far the best "Boat Bitch" out there!

    What he said. The carbs are 750cfm boost referenced Holleys. I'm running 8lbs of boost and everything is working really well.

    I was told that they have the serpentine belt to allow for slip if the motor backfires. I guess they need this because they don't have a pop off valve? Seems you can find these blowers really cheap and as far as I can tell they work fine.

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    Senior Member bruddah's Avatar
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    [QUOTE=Kylemenz1;841896]Bruddah is by far the best "Boat Bitch" out there!
    QUOTE]

    better watch your mouth...

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