Blower Belt Jump
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Blower Belt Jump
I am building a couple blower motors and in talking with several people have heard a common issue with marine blown motors. It seems that everyone has an issue with throwing belts. So, my questions is, why is there not a larger belt guide on the pulleys? My set up has maybe a 1/4" on both. Seems to me that if there was a larger/taller one the belt would have to grow much more before slinging off. Just my thoughts....Whats yours?
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Fixx
here's my opinion,,most roots style blowers with the cog set up only have one idler pulley/tensioner..the idler pulley has a step machined in it to keep from throwing the belt on one side,if you were to add another idler pulley on the opposite side of the belt i would think that would help from throwing the belt.watch the belt on one,the side that has no pulley always seems to have a wrinkle in it on deceleration..
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The belt must have a set slack, which i think is 3/4" side to side. A tight belt has a greater risk of walking off. I never threw a belt. 195 hrs and counting.
From The Blower Shop website...
How tight should I run my blower belt?
The blower belt adjustment should be done with the motor cold, and have 3/4" deflection in or out on the long side of the belt. This should give you 1 1/2" total deflection. Once the motor is warm this will decrease to roughly 1/4" deflection in or out, or a total deflection of 1/2". Over thightening the belt can cause severe damange to the blower and/or crankshaft
From The Blower Shop website...
How tight should I run my blower belt?
The blower belt adjustment should be done with the motor cold, and have 3/4" deflection in or out on the long side of the belt. This should give you 1 1/2" total deflection. Once the motor is warm this will decrease to roughly 1/4" deflection in or out, or a total deflection of 1/2". Over thightening the belt can cause severe damange to the blower and/or crankshaft
#4
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The belt must have a set slack, which i think is 3/4" side to side. A tight belt has a greater risk of walking off. I never threw a belt. 195 hrs and counting.
From The Blower Shop website...
How tight should I run my blower belt?
The blower belt adjustment should be done with the motor cold, and have 3/4" deflection in or out on the long side of the belt. This should give you 1 1/2" total deflection. Once the motor is warm this will decrease to roughly 1/4" deflection in or out, or a total deflection of 1/2". Over thightening the belt can cause severe damange to the blower and/or crankshaft
From The Blower Shop website...
How tight should I run my blower belt?
The blower belt adjustment should be done with the motor cold, and have 3/4" deflection in or out on the long side of the belt. This should give you 1 1/2" total deflection. Once the motor is warm this will decrease to roughly 1/4" deflection in or out, or a total deflection of 1/2". Over thightening the belt can cause severe damange to the blower and/or crankshaft
What he said.
I run the belts loose and have never thrown one off.
8mm belt roots blower
Kris Vogt
#6
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Now pro chargers on the other hand that junk would kill a belt every run,rib or gilmer
the roots stuff we spin 7000 + and on the party deck we spin 6500 ALL DAY
#7
on my old Scarab at 12psi never had any belt problems.I think the main problems I hear is like the longer belts.like for a PSI or the big Whipple blower, being they run mutable tensioner and idlers
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#8
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same here never lost a belt on a roots blower and if you run aluminum head they grow more than cast iron .
Now pro chargers on the other hand that junk would kill a belt every run,rib or gilmer
the roots stuff we spin 7000 + and on the party deck we spin 6500 ALL DAY
Now pro chargers on the other hand that junk would kill a belt every run,rib or gilmer
the roots stuff we spin 7000 + and on the party deck we spin 6500 ALL DAY
#9
The stock mounting plate flexes as the boost goes up, add some braces to hold it solid and you won't loose belts. Adding a guide will probably just wear the edge off and cause the belt to break.
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Fixx
what he said,,also if you have a 6 or 8 rib set up it will go through belts, too small of a blower pulley will cause more slippage which in return will eat belts..i have 2 12 rib set ups on my engines we will see how that works..
ps did you shim the crank pulley properly?
ps did you shim the crank pulley properly?