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Big Block Talk! Everything about swapping a big block engine into your cart! |
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07-18-2021, 07:03 PM | #1 |
Not Yet Wild
Join Date: Jul 2021
Location: Iowa
Posts: 18
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Big bore clutch issues
Hello all. Been stuck on this issue with my 22hp predator install. I have a 1988 club car ds with predator 22hp installed. Running comet 780 and cvtech secondary with 21" tires. Engine has only had governor removed. The issue is with the belt slipping, and getting pulled down in the secondary on takeoff. It seems as if secondary spring is to weak. Once cart is moving the secondary clutch pushes belt outward and as primary closes secondary opens. I'm just wondering if anyone more familiar with these clutches has any idea what I need to do. Beyond this the cart would be a blast and will push 40 on slight downhill.
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07-19-2021, 05:52 PM | #2 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,421
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Re: Big bore clutch issues
I'm a little confused from your description....
As the primary clutch closes, the belt will ride higher in the sheaves. When that happens, the belt will gradually ride lower into the secondary clutch. At full shift, your belt will be at the top of the primary and at the bottom of the secondary. Is that what's happening? |
07-19-2021, 05:54 PM | #3 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,421
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Re: Big bore clutch issues
One way to test your secondary is to remove the belt and physically open and close the sheaves by hand. If they are easy to move, you might have a broken spring. If things are normal, they should be difficult to move by hand.
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07-19-2021, 09:33 PM | #4 |
Not Yet Wild
Join Date: Jul 2021
Location: Iowa
Posts: 18
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Re: Big bore clutch issues
No, right on takeoff the belt gets pulled down in the secondary and then slips. Climbing small hills it does the same. Clutch doesn't open up.
https://www.youtube.com/watch?v=cQ8C4NalwXE |
07-20-2021, 03:25 AM | #5 |
British born Nincompoop
Join Date: Feb 2007
Location: United Kingdom
Posts: 2,456
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Re: Big bore clutch issues
Looks like Slonomo is on the money here.
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07-20-2021, 07:00 AM | #6 |
Not Yet Wild
Join Date: Jul 2021
Location: Iowa
Posts: 18
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Re: Big bore clutch issues
I'll have to try opening it by hand tonight.
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07-20-2021, 09:37 PM | #7 |
Not Yet Wild
Join Date: Jul 2021
Location: Iowa
Posts: 18
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Re: Big bore clutch issues
The secondary pulls apart pretty hard. I can only just move it. It looks like maybe it's misaligned side to side a little.
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07-21-2021, 08:25 PM | #8 |
Not Yet Wild
Join Date: Jul 2021
Location: Iowa
Posts: 18
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Re: Big bore clutch issues
It looks like the belt slips, drive clutch closes till the belt starts grabbing, lugs motor, drive clutch opens, then it takes off.
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07-23-2021, 06:06 AM | #9 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,421
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Re: Big bore clutch issues
Hard to tell from the video. I will say this, the belt will drop down into the rear clutch on take off, that's how the cvt works. The front (primary aka drive) clutch controls the engagement and drive power. The rear (secondary aka driven) clutch controls the shifting and gear ratio. CVT stands for Continuously Variable Transmission, meaning it's always self adjusting and changing the gear ratios automatically. The belt will always be up and down inside the sheaves of the clutches at all different levels.
If you have slippage, the belt is either worn, poor quality, or misaligned with the secondary. If you aren't sure on the physical condition, remove all the parts and inspect and post photos. |
07-23-2021, 06:08 AM | #10 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,421
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Re: Big bore clutch issues
Front clutch on engine = Drive clutch or Primary clutch
Rear clutch on trans = Driven clutch or Secondary clutch Just to make sure you're describing your issue correctly, use these terms or it can get really confusing for anyone trying to help you diagnose. Cvt works like this: 1. Engine rpms at idle say 1100 rpm, drive belt will slip in the primary clutch when in gear with your foot on the brake. The drive belt will not move but the drive clutch will be spinning. The driven clutch will not be spinning. 2.As engine rpms increase, the drive clutch will start to close, say 1600-1800 rpm or so. Once the drive clutch sheaves begin to touch the belt, the belt will start moving. We call this clutch engagement. 3. Once the drive belt starts moving the Secondary clutch will start spinning, which will start moving the vehicle. 4. As the primary clutch closes more, the belt pulls the Secondary clutch open. The more the primary closes, the more the belt will drop into the Secondary. This is called shifting. 5. When the primary clutch is fully closed, the belt will be all the way up on the primary sheaves. At that point the belt will be all the way down into the Secondary clutch, and will be all the way up in the primary clutch sheaves. We call this point full shift. 6. When you let off the accelerator the primary clutch will open back up, the spring in the Secondary clutch will force the sheaves closed and the belt will move back up higher in the Secondary sheaves. 7. Repeat |
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780 clutches cvtech |
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