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Post by triker on Mar 17, 2013 23:18:05 GMT -5
I am trying to decide what clutch and variator to use on the stroker engine I am getting ready to build. I have noticed that one has 50 degree pillow springs and the other has 60 degree springs. What I would like to know is. What is the performance difference between the two?
Roy
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Post by skuttadawg on Mar 18, 2013 0:13:21 GMT -5
Good luck I have asked this too and seems nobody really knows for sure . I would try to see what degree yours is and contact DR Pulley directly . Knowing how much better DR Pulley sliders and rollers are than the others and with the expensive price of their clutches as it may be one of the most expensive I figured sure it has to be much better than OEM and the fact the it comes with spring kits and weights really help one fine tune it . I have read where some had their DRP clutch come apart and cause damage . Could be in stallion error unsure . I read where the DRP variators are about the largest in diameter which can ad 5 MPH on top end in some cases but takeoff a lil less . I decided that hopefully this summer I would get a Stage 6 clutch , BBK and crank but still unsure on variator as mine works fine and its the larger size like on the 90s . Note my scooter is a 2T but I think Stage 6 makes 4T parts too but I only looked up their 2T line of parts . Greg has the lowest price on DR Pulley goodies I have seen and I would measure yours with a caliper and inspect if you have enough clearance for a possible larger set of parts to fit without hitting the bendix eshop.mainelyscooters.com/by-brand/dr-pulley?limit=allNow if you have a GY6 maybe a CFMoto clutch or variator may fit and work as MRPs video reviewed a Echarm like I bought afte watching the video and MRP replaced the clutch and variaotor in it and another scooter . The Echarm he said was no diff but it was an improvement on the other scooter . Here is is a link sorry its not embedded as I used a quick reply Here is some CFMoto parts www.scrappydogscooters.com/CF150_4T_1P58MJ_Parts.html |
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Post by fugaziiv on Mar 18, 2013 9:04:37 GMT -5
The easy answer is: The higher the degree pillow spring, the harder the clutch will hit, and the more torque it can hold without slipping. Hence the name HiT Clutch. It's harder to explain how they work without a visual representation, but here is what happens: in a normal clutch, the clutch shoe is on a swinging arm, and at a specified RPM, the arm swings out and engages the clutch bell. On a Dr. Pulley HiT Clutch, the arm swings (normal clutch spring) and then slides the back half of the shoe (pillow spring) against the clutch bell for further positive engagement. This creates the "hit". When these guys engage, they ENGAGE. The Dr. Pulley clutches are very likely the strongest clutches on the market because of their sliding arm design. Hope this helps. Matt www.partsforscooters.com/Welcome?search=HiT |
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Post by triker on Mar 18, 2013 9:29:27 GMT -5
Thank you Matt. That is the kind of answer I was looking for. I understand how the clutch works by your explanation.
Skuttadawg, I have also read that some of these clutches have flew apart. If you research enough you will find that a percentage of all clutches have failed. The trick is to figure out how much of it was user error and how much was actually defective parts. Thank you for your response.
Roy
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Post by alleyoop on Mar 18, 2013 9:42:29 GMT -5
I have heard that the break occurs where the springs hooks up to the built in hole. That is the weak point on them.
But I really do not think you need all that really if you just get a NCY performance clutch which has 1" more of material more material grabs the bell is all you really need. I have the NCY Clutch on mine and have no problems with slipping and I have the weakest spring so it grabs at around 2300 rpms.
my .02
Alleyoop
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Post by triker on Mar 18, 2013 10:08:11 GMT -5
Thanks Alley, If enough of ya pitch in .02 cents I will soon be rich with knowledge. You are correct about the surface area of the pads. But how much of the pad actually grabs the bell though?
Roy
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Post by alleyoop on Mar 18, 2013 10:34:56 GMT -5
More than your normal clutch does, for the price of a Dr. Pulley you can buy 4 NCY clutchs and I would bet you will not notice any difference between the two.
my +.03 cents worth just gave you a raise
Alleyoop
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Post by scooterelements on Mar 18, 2013 10:48:16 GMT -5
From what i have heard that clutch is amazing! Thats what i wanted for my build but they are not cheap. Hope to have one of them one day.
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Post by triker on Mar 18, 2013 11:13:21 GMT -5
I have been eying them for some time now. But like you said they are not cheap. I already have almost a thousand dollars invested in this build and ain't done yet.
This is what I have so far:
New donor engine
NCY 50mm cylinder kit
NCY 50mm head
NCY A9 cam
Hoka 44mm stroker crank
Hoka intake
Keihin carburetor
And various other items such as: coil, cdi, gaskets, seals.
Roy
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Post by alleyoop on Mar 18, 2013 11:14:45 GMT -5
Just remember if you put the PEDAL TO THE METAL the clutch may not slip but the belt in the Variator will. In addition if your motor is not strong enough and if for some reason neither slips a little it will bog your motor. Happens a lot on the dragstrip if your take off RPMS are not high enough and everything hooks up really nice but your power is to low to move the dead weight from a standstill.
my .04 cents you just got another raise
Alleyoop
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..BAD TO THE BONE..