Quick blower belt question
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Quick blower belt question

  1. #1
    not ****** little squirt's Avatar
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    Default Quick blower belt question

    i see blower belts going over idler pulley's and under.....whats the deal? just depends, dosent matter, for clearance issues, sorry just a newbie question. thanks



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  3. #2
    Rollin With Fink fasterthanu's Avatar
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    Makes no diff IMO. Ran them both ways for various reasons...

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    Senior Member ol guy's Avatar
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    Reasons!!! Blower belt will turn crank pressure to drive pulley to turn blower. Idler sets slack adjustment. The most rubber is on the back side. Not the cogs, be it 1/4 or 8mm drive! Where would you want the wear at?? M

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    Senior Member GT Jets's Avatar
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    Quote Originally Posted by ol guy View Post
    Reasons!!! Blower belt will turn crank pressure to drive pulley to turn blower. Idler sets slack adjustment. The most rubber is on the back side. Not the cogs, be it 1/4 or 8mm drive! Where would you want the wear at?? M

    That, and clearance and noise, blower belt whine is less when the idler is on the backside of the belt, but it has to fight the centrifugal forces of the rotating belt, so maybe also depends on RPM???


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    The Great Humongous P-Money's Avatar
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    I've always ran mine in the inside of the idler, you get more wrap on the top pulley that way.

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    The belt is trying to be a circle as it spins, so it will use up less hp if the idler is on the inside/tooth side. Circle track, not road course, is what you want, lol. The first pic is backwards(unless it is a reverse rotation engine(motor). If is rotates normally, that would be the absolute WORST place to put an idler(if so, what was that dude smokin')?The blue engine is the best way, and is how all Pro drag racers have them. Some times if the idler is bolted to a front plate on the front of the block, you have to run the belt old style, just to get the adjustment. It also makes the outside of the belt look ugly, and worn. I would want all my wear on the inside/teeth, as it was designed. The outside is not designed to be a run surface. That opposite turn for the belt sucks up a little hp.
    More wrap on the top pulley is more of a concern with a stripped blower, but really, how much more do you get, 1/2 tooth ? The less contact between the belt & pulleys, the less hp drain... Todays belt systems with the round teeth (the old 1/2" drives had flat/square teeth) lets you run them a little looser, letting a couple more horses out of the corral.

  9. #7
    Member paradigm shift's Avatar
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    Quote Originally Posted by little squirt View Post
    i see blower belts going over idler pulley's and under.....whats the deal? just depends, dosent matter, for clearance issues, sorry just a newbie question. thanks





    Top picture is the engine reverse rotation? Idler and drive on blower is on wrong side. I prefer to idler on outside of belt but I have seen them run on the inside without any issues. I think it just depends on what type of idler you have and belt length you can get.

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    It is Reverse Rotation, that is why the blower snout is on backwards, as well.

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    Quote Originally Posted by paradigm shift View Post
    Top picture is the engine reverse rotation? Idler and drive on blower is on wrong side. I prefer to idler on outside of belt but I have seen them run on the inside without any issues. I think it just depends on what type of idler you have and belt length you can get.
    Yes it is.

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