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Author Topic:   htd drive belts
rpm20
Dirt Freak

Total posts: 338
posted May 11, 2005 05:22 AM  
i have changed over to the htd cog belt from my crank to water pump and from my water pump to the fuel pump.
it works great but if the motor kicks back as its shut off then it tears the belt from the crank to the water pump right in half.
any suggestions on a better belt or do i need to go back to a v belt from the crank, i like the setup, other than this bit of trouble.

A&M Motorsports
Dirt Maniac

Total posts: 117
posted May 11, 2005 07:44 AM  
RPM, it looks like you have 3 choices.
1. Carry plenty spare belts.
2. V-Groove pulleys.
3. Stop the engine from kicking back.
Don't feel like the Lone Ranger RPM. It seems like every time we buy something that looks nice and think that there is some benefits from using it, there is always some drawbacks. Sometimes I think we all forget the K.I.S.S. theory. (Keep It Simple Stupid)
I'm not calling you stupid by the way.
Then there is always Murphy,s Law. If something can go wrong it will.

------------------
Artie Perilloux
A & M Motorsports

rpm20
Dirt Freak

Total posts: 338
posted May 11, 2005 10:03 AM  
i do have the v belt set and have considered going back but theres also maybe better belts?

Kromulous
Dirt Forum Champ
Total posts: 796
posted May 11, 2005 10:21 AM  
Thats odd, there shouldnt be that much stress on that belt just to turn the water pump.

I know there is the HTD & Gilmer type belts, maybe there is a kevlar lined replacement. That or call the manufacturer and see what they have to say.

fr1
Dirt Forum Racer

Total posts: 93
posted May 11, 2005 10:44 AM  
When we had this problem is was caused by the fan blade (from my experience).

We tried to run Gilmer pulleys in the early 90's and kept breaking belts. Went to a serpentine on the fan and and HTD on the fuel pump and power steering.

When sprint cars run these drives they don't use a fan blade and they don't have any problems.

rpm20
Dirt Freak

Total posts: 338
posted May 11, 2005 12:27 PM  
i am running a 15" 5 blade steel fan, you think a plastic fan or flex fan might stop this?

quote:
Originally posted by fr1:
When we had this problem is was caused by the fan blade (from my experience).

We tried to run Gilmer pulleys in the early 90's and kept breaking belts. Went to a serpentine on the fan and and HTD on the fuel pump and power steering.

When sprint cars run these drives they don't use a fan blade and they don't have any problems.



dirtracer14
Dirt Forum Champ
Total posts: 1261
posted May 11, 2005 09:34 PM  
RPM i went threw all of this allready over the last few years. I could run the gilmer with a plastic fan no problem....all year 30 races or so. Then i went to a steel fan and lost it the first time i went on the track. Got a new htd setup lasted till the first time the track was tacky and i could get on it real hard....then i lost it. I talked to a few people about it and they told me NOT to run a fan if i was using cog belts on the water pump...with a good fan the drag was to much and would tear the belt. I called pettersons and got a pullie that i could use with the kse mandrel and was a 1 to 1 with my water pump and run the 2 v belts....so far no problem. The reason i took the plastic off was to help cool now that i have 1 to 1 i might go back....i just dont trust the cog anymore with a fan!

rpm20
Dirt Freak

Total posts: 338
posted May 12, 2005 04:06 AM  
hey dirtracer14,
how did the plastic fan work and what kind of temp did you have on hot nights using that fan. i was considering that option.

quote:
Originally posted by dirtracer14:
RPM i went threw all of this allready over the last few years. I could run the gilmer with a plastic fan no problem....all year 30 races or so. Then i went to a steel fan and lost it the first time i went on the track. Got a new htd setup lasted till the first time the track was tacky and i could get on it real hard....then i lost it. I talked to a few people about it and they told me NOT to run a fan if i was using cog belts on the water pump...with a good fan the drag was to much and would tear the belt. I called pettersons and got a pullie that i could use with the kse mandrel and was a 1 to 1 with my water pump and run the 2 v belts....so far no problem. The reason i took the plastic off was to help cool now that i have 1 to 1 i might go back....i just dont trust the cog anymore with a fan!

[This message has been edited by rpm20 (edited May 12, 2005).]

dirtracer14
Dirt Forum Champ
Total posts: 1261
posted May 12, 2005 07:51 PM  
Well if i just raced and no idle or to many yellows it was right at 200 to 210 that was with the gilmer and htd pullies wich were like 50% reduction Some nights it would get to 220 230 wich made me real nervous!! I now have 80% of my rad tapped and i run 180 to 190 with 1 to 1 pullies and a steel fan....i like having to make heat not try and get rid of it!

rpm20
Dirt Freak

Total posts: 338
posted May 13, 2005 04:40 AM  
WERE YOU RUNNING A SHROUD ??


quote:
Originally posted by dirtracer14:
Well if i just raced and no idle or to many yellows it was right at 200 to 210 that was with the gilmer and htd pullies wich were like 50% reduction Some nights it would get to 220 230 wich made me real nervous!! I now have 80% of my rad tapped and i run 180 to 190 with 1 to 1 pullies and a steel fan....i like having to make heat not try and get rid of it!


dirtracer14
Dirt Forum Champ
Total posts: 1261
posted May 13, 2005 01:22 PM  
Nope i had the blade about 1" from rad. I was a bit lean and i think the reduction was to much because if i was racing it would be fine but when i slow down it would heat up...same stopped if i keep the rpm up it would stay cooler. I know other people that run the plastic with no problems ...but they dont run the gilmer or the htd belts...i couldnt find a less reduction pulley set for the cog type belts....the best for me is 1 to 1

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