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by: scooter - Aug 23, 2014 20:53:57 GMT -5
Post by scooter on Aug 23, 2014 20:53:57 GMT -5
So it'e not only the variator that determines the ratio of front to back pulley, the springs in the clutch assembly ALSO somehow affect the pulley ratio? Yes. The main, or ,"contra" (a word that in spanish means "against", or "counter") spring is opposing the variator pulley by pushing the back sheaves closed while the variator is trying to close the front ones. The harder it pushes, the harder the variator must push to do its work. This is what the blue yellow and red springs are for. I don't know, but I assume "1,000", "1500", and "2,000" are the number of extra RPMs it will take to open the pulley fully? I also assume they mean rear pulley RPMs and not engine RPMs.  The clutch also has a little cam cutout/s in it. (See the curved slots in the picture.) As I understand it, the angle of those slots also affects how hard it is for the variator sheaves to counter the force of the clutch sheaves. I read they have two angles in them that gives the clutch a sort of "high" and "low" gear, but I don't know. I have not taken the time to look into that yet. There are so many things that can be "played with" on these CVTs that one could spend a lot of time and money tweaking on it. ![]()  |
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by: rcq92130 - Aug 24, 2014 14:52:05 GMT -5
Post by rcq92130 on Aug 24, 2014 14:52:05 GMT -5
Does the clutch ALSO squeeze the belt, changing it's effective pulley diameter like the variator?
If not, how on earth does it affect the ratio of front-to-rear pulley diameters (assuming RPM > 3000)?
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by: scooter - Aug 24, 2014 20:56:03 GMT -5
Post by scooter on Aug 24, 2014 20:56:03 GMT -5
Does the clutch ALSO squeeze the belt, changing it's effective pulley diameter like the variator? If not, how on earth does it affect the ratio of front-to-rear pulley diameters (assuming RPM > 3000)? Yes. The clutch also squeezes the belt. That's what the contra spring does. Without the contra spring opposing it, the variator would instantly slam the front pulley into high gear. The clutch, ignoring the centrifugal part of it, is very much like the variator. The difference is, the variator is powered by centrifugal force, and the clutch is powered by its spring.  |
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by: rcq92130 - Aug 24, 2014 22:03:37 GMT -5
Post by rcq92130 on Aug 24, 2014 22:03:37 GMT -5
GREAT explanation, Scoot.
So now the logical question is: How do you know if you need a different spring, and if so, what kind?
Related: Just ordered a BBK kit, so probably I should wait till that's on before going back to getting the transmission working right. Right?
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by: scooter - Aug 25, 2014 4:43:53 GMT -5
Post by scooter on Aug 25, 2014 4:43:53 GMT -5
GREAT explanation, Scoot. So now the logical question is: How do you know if you need a different spring, and if so, what kind? Related: Just ordered a BBK kit, so probably I should wait till that's on before going back to getting the transmission working right. Right? I am already down to 8g weights, which is way below the stock 13 or 14g ones. I don't even know if they sell lighter ones in this size. If I want to increase my RPMs without lightening the weights, I'd have to add a tighter spring. I wouldn't waste money on cvt tuning until you get your bbk in. It's going to change the whole dynamic of the system for sure. More power will mean you will likely need heavier weights. |
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by: geh3333 - Aug 25, 2014 13:46:49 GMT -5
via mobile
Post by geh3333 on Aug 25, 2014 13:46:49 GMT -5
I mentioned this on another thread and I think you should check your spark plug to make sure it's not loose . This could cause a loss of compression and that could be why you are down to 8 gram weights . Loss of compression equals loss of power " maybe not enough to turn heavier weights up to the norm rpms .
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by: scooter - Aug 25, 2014 16:29:08 GMT -5
Post by scooter on Aug 25, 2014 16:29:08 GMT -5
I mentioned this on another thread and I think you should check your spark plug to make sure it's not loose . This could cause a loss of compression and that could be why you are down to 8 gram weights . Loss of compression equals loss of power " maybe not enough to turn heavier weights up to the norm rpms . Spark is good. I have a new plug, coil, and CDI. With the old variator I have high RPMs and pounds of torque with these light weights, but with the new variator, I have lower RPMs, which I like, but off the line it's a little weak. I'm looking for adjustment shims right now and those should allow me to fine tune my cvt. Either way, I'm going to have to compromise and that sucks. haha. |
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by: scooter - Aug 25, 2014 16:35:21 GMT -5
Post by scooter on Aug 25, 2014 16:35:21 GMT -5
Hopefully they actually work . Lol Update. They are here and they work. You can feel the cheapness in the action but at less than 1/10th the price of mitutoyo, if they work for even a few months they'll be a decent deal. Now I'm ready to measure stuff!  |
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by: geh3333 - Aug 25, 2014 16:38:46 GMT -5
via mobile
Post by geh3333 on Aug 25, 2014 16:38:46 GMT -5
That's good keep us posted .
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by: rcq92130 - Aug 27, 2014 12:50:19 GMT -5
Post by rcq92130 on Aug 27, 2014 12:50:19 GMT -5
Hi GEH!
Just checked tracking and my BBK should arrive tomorrow.
You mentioned videos showing the removal of the engine/rear wheel assembly and the replacing of the piston, etc. I'd appreciate a heads up about where to find them.
Thanks!
UPDATE: BBK kit arrived 1 day early. Installation tomorrow. Wish me luck.
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by: scooter - Aug 28, 2014 15:39:29 GMT -5
Post by scooter on Aug 28, 2014 15:39:29 GMT -5
Hi GEH! Just checked tracking and my BBK should arrive tomorrow. UPDATE: BBK kit arrived 1 day early. Installation tomorrow. Wish me luck. How is your build going, rcq? |
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by: rcq92130 - Aug 28, 2014 23:26:03 GMT -5
Post by rcq92130 on Aug 28, 2014 23:26:03 GMT -5
BBK in in; scooter started up easily. Will reprot tomorrow.
Question: wondering what break in procedure. Just finished 300 miles of <35 mph, then 200 miles of <45 mph --- don't know if I have any low speed left in me ......
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by: scooter - Aug 29, 2014 5:57:41 GMT -5
Post by scooter on Aug 29, 2014 5:57:41 GMT -5
BBK in in; scooter started up easily. Will reprot tomorrow. Question: wondering what break in procedure. Just finished 300 miles of <35 mph, then 200 miles of <45 mph --- don't know if I have any low speed left in me ...... Here is a thread on scootdawg. scootdawg.proboards.com/thread/3807/gy6-recommended-breakYou could start a thread about it here and in the meantime google "gy6 break in procedure" or something like that to get many ideas and answers. |
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