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belt drives

General engine tech -- Drag Racing to Circle Track

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bsfc9

belt drives

Post by bsfc9 » Wed Sep 08, 2004 8:42 pm

i am building a 500cid big block with a 14-71 blower and plan to use a Jesel belt drive. i have had some relate to me that problems with the belt may occur due to "harmonics" generated by driving the blower. anyone heard of this? also does it take more power to run a belt or timing chain?

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Post by CNC BLOCKS » Wed Sep 08, 2004 9:57 pm

We have 2 SBC with 8-71 Littlefield blowers on both these with Buick heads, These engines are used in tractor pulling and we use Shaver/Wesmar gear drives on both engines one is a Dart aluminum block the othe is a Brodix they run on alky and they turn these 9200 to 9500 for up to 45 seconds at a time one engine is at least 7 years old and the other is 3 years old and both have had no problems with that set up.

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bsfc9

Post by bsfc9 » Thu Sep 09, 2004 12:11 pm

i am mostly concerned with potential problems with a timing belt (vs. timing chain or gear drive) when used with a blower.

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Re: belt drives

Post by pdq67 » Thu Feb 13, 2020 7:14 pm

I know, A VERY OLD THREAD!!

Do people still drill little holes in the belt pulley cog valleys to let the air out from between the belt and pulleys at speed to help here??

pdq67

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Re: belt drives

Post by lefty o » Thu Feb 13, 2020 7:23 pm

posted, then seen it was 16yrs old. #-o

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Re: belt drives

Post by Coloradoracer » Fri Feb 14, 2020 9:18 am

pdq67 wrote:
Thu Feb 13, 2020 7:14 pm
I know, A VERY OLD THREAD!!

Do people still drill little holes in the belt pulley cog valleys to let the air out from between the belt and pulleys at speed to help here??

pdq67
Not sure why they would do this as there is no benefit......other than putting holes in the pulley!
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Rick!
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Re: belt drives

Post by Rick! » Fri Feb 14, 2020 10:54 am

I've replaced timing belts on myriad engines and none, including Ferrari and other exotics, had holes in the cam gear.

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