Heavy Hitters or STM Supertips

[creep]

What would be the choice on a 4-arm STM clutch.

Looking for the best performance for trail / lake?

 

[ClutchMaster]

What would be the choice on a 4-arm STM clutch.

Looking for the best performance for trail / lake?

The heavy hitters will give too much belt force @ full shift out IMO.
I run the STM 60y weights (aggressive profile) and if your not at or above 270hp you won’t be able too pull them. they push very hard on the big end and require a high rate primary spring in conjunction with low finish angle helix.
The STM 50 or 60 gram “YS” style cam arms Depending on your tune, would be a better choice IMO.

 

[Thunder Products]

What would be the choice on a 4-arm STM clutch.

Looking for the best performance for trail / lake?

Depending on your hpr, our heavy hitter weights are available in many gram styles. Our weights have an aggressive profile (which STM has tried to copy) which allows us to use less weight and less spring to get all your power to the track.

Thunder Products Clutching also has our Thunder Shift weights that start at 37 grams.

Kurt Schultz who races a Pro Stock 800 runs our weights in his 4 tower clutch and is the current record holder.

Arctic Cat factory race teams have all switched to our Heavy Hitter weights because their previous setups were causing too much belt heat and destroying belts mid race due to high clutch temps. All cross country races, the Soo-500 and Kinross 250 race proved that the belt only wore less than .020" and hasn't blown a belt since. Clutch temps after 98 green flag laps were just over 115°. Best part it's the same identical weight setup that what works great on trail sleds also.

Thunder Products Clutching has many happy trail customers and many wins this year alone. Go to our facebook page and see our reviews. www.thunderproductsclutching.com

The heavy hitters will give too much belt force @ full shift out IMO.
I run the STM 60y weights (aggressive profile) and if your not at or above 270hp you won’t be able too pull them. they push very hard on the big end and require a high rate primary spring in conjunction with low finish angle helix.
The STM 50 or 60 gram “A” style cam arms Depending on your tune, would be a better choice IMO.

If you are not slipping the belt, running proper RPM and clutches are cool....how can it be too much belt force????

 

[Doowithblue]

Running the 60y myself and very happy with them.

 

[ClutchMaster]

Depending on your hpr, our heavy hitter weights are available in many gram styles. Our weights have an aggressive profile (which STM has tried to copy) which allows us to use less weight and less spring to get all your power to the track.

Thunder Products Clutching also has our Thunder Shift weights that start at 37 grams.

Kurt Schultz who races a Pro Stock 800 runs our weights in his 4 tower clutch and is the current record holder.

Arctic Cat factory race teams have all switched to our Heavy Hitter weights because their previous setups were causing too much belt heat and destroying belts mid race due to high clutch temps. All cross country races, the Soo-500 and Kinross 250 race proved that the belt only wore less than .020" and hasn't blown a belt since. Clutch temps after 98 green flag laps were just over 115°. Best part it's the same identical weight setup that what works great on trail sleds also.

Thunder Products Clutching has many happy trail customers and many wins this year alone. Go to our facebook page and see our reviews. www.thunderproductsclutching.com





If you are not slipping the belt, running proper RPM and clutches are cool....how can it be too much belt force????

Did I say the belt was cool and rpm’s were ok?

If STM wanted to copy your weights, it would be as easy, You don’t have a patent on the profile.

What I’m getting at is they are very similar profile to what I’m using, and in a four arm clutch they push extremely hard at full shift out.

With a four arm primary he will need a very shallow finish angle helix and high rate primary spring in order to maintain rpm.

BTW yes you can have too much belt tension, it makes for inefficient clutching.

The heavy hitters are great weights no doubt, but I like them more in a 3 arm clutch, not 4 arm. That’s all I’m saying. I will be switching to the “YS” style weights myself this year to see if I like them better.

 

[ClutchMaster]

Running the 60y myself and very happy with them.

In a 3 arm or 4 arm clutch?

 

[NOS-PRO]

Did I say the belt was cool and rpm’s were ok?

If STM wanted to copy your weights, it would be as easy, You don’t have a patent on the profile.

What I’m getting at is they are very similar profile to what I’m using, and in a four arm clutch they push extremely hard at full shift out.

With a four arm primary he will need a very shallow finish angle helix and high rate primary spring in order to maintain rpm.

BTW yes you can have too much belt tension, it makes for inefficient clutching.

The heavy hitters are great weights no doubt, but I like them more in a 3 arm clutch, not 4 arm. That’s all I’m saying. I will be switching to the “A” style weights myself this year to see if I like them better.

No you didn't, but if you have the 3 major things covered that lead to proper efficient clutching, then you have the perfect belt squeeze and efficient clutching. That is why it is an adjustable weight. Too much belt squeeze causes heat and sucks down rpm....and Thunder Products Clutching HH weights properly setup puts the perfect amount of pressure on the belt. There are many running Thunder Products Clutching weights with 4 arm STM and Pro-4 clutches with zero issues.

 

[ClutchMaster]

No you didn't, but if you have the 3 major things covered that lead to proper efficient clutching, then you have the perfect belt squeeze and efficient clutching. That is why it is an adjustable weight. Too much belt squeeze causes heat and sucks down rpm....and Thunder Products Clutching HH weights properly setup puts the perfect amount of pressure on the belt. There are many running Thunder Products Clutching weights with 4 arm STM and Pro-4 clutches with zero issues.

Don’t jump all over me like that. I’m just giving my opinion. If you have a combo that works, fine sell it.
I’m just stating some things I have found with the more aggressive weight profiles in a 4 arm clutch. I’m not trying to sell anything! Just trying to help members make educated decisions.
I have made them work well also but I believe it could be better, that’s my opinion, I’m entitled to that. That’s why I will be trying a less aggressive profile weight this year in my 4 arm.
I have zero belt issues on my machine, that’s not saying it couldn’t be better.

If you have a great setup then post it!
I will post mine when I get home and my notes are available to me.

 

[ClutchMaster]

STM 4 arm Primary
Dalton white/blue primary (ski doo 185/410)
STM 60y weights, one tungsten in heal, 4 washers middle, empty tip.
XS825 belt
STM gen1 secondary
46/36 helix
Cat green sec spring @ 50 degrees.
24/41 gearing 129” track 1.375” lugs


You’ll need the Winder race gas 300hp tune to pull this setup, 270r wont have the power.

A trail weight will have more belt squeeze down low because the weights aren’t tucked as much.
Up top they have less force due to the curve of the weight. If I were drag racing 660’ I could bring the gearing way down and then add weight in the tip. For trails and lake running I have to run all the weight twards the heal with the 60y’s
The other option is a custom helix with a finish angle of 34 degrees or less. But I have no issues slipping up top so more belt tension just means more unnecessary clamping force.
Taller gearing is not helping me either!
Engagement is around 4200 rpm, I need this higher than a Winder because my turbo lags more.

As you can see the weight placement is less than ideal.

 

[creep]

Interesting info.Keep it coming.

 

[eightpilot]

STM weights have more adjustability then the HH's. I am running 86 grams in each of my 4 STM flat profile weighs and I still have more room for weight...

 

[ClutchMaster]

STM weights have more adjustability then the HH's. I am running 86 grams in each of my 4 STM flat profile weighs and I still have more room for weight...

Are you using the “YS” weights or the “A” weights?

 

[eightpilot]

Are you using the “YS” weights or the “A” weights?

 

[eightpilot]

AFP

 

[NOS-PRO]

Don’t jump all over me like that. I’m just giving my opinion. If you have a combo that works, fine sell it.
I’m just stating some things I have found with the more aggressive weight profiles in a 4 arm clutch. I’m not trying to sell anything! Just trying to help members make educated decisions.
I have made them work well also but I believe it could be better, that’s my opinion, I’m entitled to that. That’s why I will be trying a less aggressive profile weight this year in my 4 arm.
I have zero belt issues on my machine, that’s not saying it couldn’t be better.

If you have a great setup then post it!
I will post mine when I get home and my notes are available to me.

Never really jumped on you, only answered your questions and stated facts about the Heavy Hitter weights which is what you said is...your opinion.

We are all here to help everyone with facts....