can a belt driven fuel pump be oversped?is there a drive chart?
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can a belt driven fuel pump be oversped?is there a drive chart?

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Default can a belt driven fuel pump be oversped?is there a drive chart?

    i've got this idea in my head about a way to mount a belt driven aeromotive style fuel pump to my lsx motor and use the existing a/c belt tensioner to keep the belt between the pump and the balancer tight(take and make the cog style f.p pulley into serp style with a lathe). what i was thinkin though is that since the o.d. of the crank pulley is soooo much bigger than the o.d. of a 14tooth pump drive on a mandrel, isn't that just gonna be overdriving the fuel pump? is there such thing as a chart for belt drive pumps to figure out the final drive ratio?

    i'm thinking i can get away with it because the pump is rated for up to 12krpms, and i'm only turnin 1/2 that, but again i'll be overdriving it so who knows what the pump will be turnin at 6500 at the motor i guess the bypass regulator would be on full tilt returning fuel to the tank, but it'd damn sure have the pressure and volume there when needed. would i need a highspeed bleed off valve kinda like enderle? or would a hiflowing regulator keep up by itself?

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    gn7
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    Quote Originally Posted by IMPATIENT 1 View Post
    i've got this idea in my head about a way to mount a belt driven aeromotive style fuel pump to my lsx motor and use the existing a/c belt tensioner to keep the belt between the pump and the balancer tight(take and make the cog style f.p pulley into serp style with a lathe). what i was thinkin though is that since the o.d. of the crank pulley is soooo much bigger than the o.d. of a 14tooth pump drive on a mandrel, isn't that just gonna be overdriving the fuel pump? is there such thing as a chart for belt drive pumps to figure out the final drive ratio?

    i'm thinking i can get away with it because the pump is rated for up to 12krpms, and i'm only turnin 1/2 that, but again i'll be overdriving it so who knows what the pump will be turnin at 6500 at the motor i guess the bypass regulator would be on full tilt returning fuel to the tank, but it'd damn sure have the pressure and volume there when needed. would i need a highspeed bleed off valve kinda like enderle? or would a hiflowing regulator keep up by itself?
    First, I wouldn't even consider running a belt drive pump with dead head regulator. You pretty much have to run a bypass type. 1/2 crank speed or something pretty close is normal. I don't think i would run a belt pump any faster than I had to. Also, ask your self why you never see a belt drive oil pump, or fuel pump driven by a serpintine poly belt.



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    Senior Member Widetrack's Avatar
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    Tom, if you can give me the full OD of the pulleys I can give you the the ratios at given RPMs! I do have some charts to help! Now on the other questions you better check with someone else besides me! WT


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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by gn7 View Post
    First, I wouldn't even consider running a belt drive pump with dead head regulator. You pretty much have to run a bypass type. 1/2 crank speed or something pretty close is normal. I don't think i would run a belt pump any faster than I had to. Also, ask your self why you never see a belt drive oil pump, or fuel pump driven by a serpintine poly belt.
    seems like its gonna be more trouble than its worth to get it at 1/2 crank speed if i could find a way to do it at jetpump i'd be golden just find some way to install a 14tooth cog gear somehow on the shaft, i guess even a slightly bigger od cog gear would be better than the other idea

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    Quote Originally Posted by Widetrack View Post
    Tom, if you can give me the full OD of the pulleys I can give you the the ratios at given RPMs! I do have some charts to help! Now on the other questions you better check with someone else besides me! WT
    its 1/2 like gn said coby, the pump gear would be 28t, the crank 14t. i guess what i need to know now is how big a crank side gear i'd need to be able to cut the inside out big nuff to press it onto the pump drive shaft or have a alum shaft built with it on it, shit i don't knowwww

    i found a belt drive pump that'll flow wayyyyy more fuel than i could ever handle for 180bucks new, would just rather use a mechanical style pump cause i don't wanna run a alt on this motor, 2 16volt mini batteries, that's it.the aeromotive pro series pump would handle the job fine but how long would it take to drain the lil batteries if i'm just out cruising? that's kinda the unknown , and i don't like unknowns

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    Quote Originally Posted by IMPATIENT 1 View Post
    seems like its gonna be more trouble than its worth to get it at 1/2 crank speed if i could find a way to do it at jetpump i'd be golden just find some way to install a 14tooth cog gear somehow on the shaft, i guess even a slightly bigger od cog gear would be better than the other idea
    1/2 crankspeed is normal ,, the reason they run a cog belt or off the cam is to keep the proper air-fuel ratio of the injection ,, on this type of system we use a bypass ,, cant help U on the regulator you could call hilborn or enderle,,,,............Eric

    Ps; sorry my mind went straight to hilborn or enderle pump's, u said aeromotive ,
    Last edited by alkyexpress; 12-21-2009 at 01:43 PM.

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    Senior Member steveo143's Avatar
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    My airmotive #11115 calls for a 48 to 24 tooth drive.
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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by steveo143 View Post
    My airmotive #11115 calls for a 48 to 24 tooth drive.
    see, if i could find that bigger 48t pump pulley, a 24tooth gear would be easy to setup on the jetpump drive shaft i'm gonna search the fp gear and see if it'll fit the pump i'm lookin at.

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    Senior Member ap67et10's Avatar
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    those belts for the front drive pumps are so small and with such shallow teeth I highly doubt you would have any kind of slipping issue with if you ran a 6-7 rib serp belt. the surface area alone far exceeds any slip possibilities you might have. in fact i would say, that your biggest issue would be (if the ac tensioner is a spring type) would be too much belt tension on the shaft of the fuel pump causing premature bearing failure, not lack of fuel delivery because of slippage. if it is manually adjustable, i think you might be find with that setup.

    the other issue is that it would be a freaking huge pulley on the little tiny pump. the weight of the pulley with the tension of the belt would wipe that thing out real quick. its all about circumfrance, if the balancer is...say 20 inches of circumfrance, then the pulley on the pump has to be twice that circumfrance. so look at your balancer and imagine a pulley (it would look more about 1/4-1/3 bigger in diameter, but the circumfrance needs to be 2x as much, so 40 inches in my example.

    AP

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    Quote Originally Posted by steveo143 View Post
    My airmotive #11115 calls for a 48 to 24 tooth drive.
    i think you may have solved my problem, thanx now just gotta figure out if the atomic aeromotive pump has the same shaft size as the basic aeromotive belt drive pump. i'm sure its bigger, that's my luck anyways

    atomic belt drive aeromotive uses a 48t pump gear, 24t crank gear
    basic aeromotive belt drive use the 28t pump gear, 14t crank gear.

    1/2 speed is 1/2 speed, so i'll check further into runnin the atomic pulleys
    Last edited by IMPATIENT 1; 12-21-2009 at 01:58 PM.

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    Quote Originally Posted by ap67et10 View Post
    those belts for the front drive pumps are so small and with such shallow teeth I highly doubt you would have any kind of slipping issue with if you ran a 6-7 rib serp belt. the surface area alone far exceeds any slip possibilities you might have. in fact i would say, that your biggest issue would be (if the ac tensioner is a spring type) would be too much belt tension on the shaft of the fuel pump causing premature bearing failure, not lack of fuel delivery because of slippage. if it is manually adjustable, i think you might be find with that setup.

    the other issue is that it would be a freaking huge pulley on the little tiny pump. the weight of the pulley with the tension of the belt would wipe that thing out real quick. its all about circumfrance, if the balancer is...say 20 inches of circumfrance, then the pulley on the pump has to be twice that circumfrance. so look at your balancer and imagine a pulley (it would look more about 1/4-1/3 bigger in diameter, but the circumfrance needs to be 2x as much, so 40 inches in my example.

    AP
    i'm ditching the idea, although i'm with you on it, i doubt it'd slipped. the a/c compressor doesn't slip and its pulling pretty hard on the motor.goin by my uncle's tonite, 48t does sound awful big

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    Senior Member steveo143's Avatar
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    Aeromotive has some kits on their site for over or under driving pumps on ls1 motors.
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    Quote Originally Posted by steveo143 View Post
    Aeromotive has some kits on their site for over or under driving pumps on ls1 motors.
    good to know, thanx the pump i'm looking at is a aeromotive knock off pump, the obx belt drive pump. its 170bucks delivered, supports 3000hp its a centri.. pump, even uses a the aeromotive mounts and pulleys.

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