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Post by oldgeek on Feb 24, 2015 0:51:29 GMT -5
Does the autotech ha've the extra exhaust ports? If not have you done any port work? What is your compression ration, like when kicking it over?I was at 175psi cold Yes it has the extra ports. Transfers are matched, and I have done pretty extensive trenching. Compression is 170psi kicking it. I used the Hoca 43.5 crank, which puts me around 99cc. |
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Post by oldgeek on Feb 25, 2015 17:35:59 GMT -5
The latest setup is the best yet.
1500 Short contra spring on a ball bearing base, steepest groove/3x5.5 & 3x10 rollers = 46.5 grams/9K @ 58.16
Launch and acceleration not quite as good as the last setup, but still pretty good, and top speed was made in about a 1/2 mile stretch, which is as far as I was willing to ride due to the 37° temp that felt more like 20°. It will likely have just a bit more top speed left. The 46.5 gram weight may be a little heavy for the 1500 contra spring, so the next setup will be with a 2000 rpm contra spring, and the same 46.5 weights.
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Post by 2strokd on Feb 26, 2015 8:39:01 GMT -5
Its nice to read about someone taking the time to really dial in their CVT! You really get to know the ins and outs of em and what kind of trade offs to expect. You are really getting it tuned and finding the limits on both ends... After that its a trade off as to what you like best for your riding habits.
You will probably find the 2,000 contra to be too stiff for good top-end but the launch and 60ft will be great!?
Good work!
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Post by oldgeek on Feb 26, 2015 11:43:04 GMT -5
Its nice to read about someone taking the time to really dial in their CVT! You really get to know the ins and outs of em and what kind of trade offs to expect. You are really getting it tuned and finding the limits on both ends... After that its a trade off as to what you like best for your riding habits. You will probably find the 2,000 contra to be too stiff for good top-end but the launch and 60ft will be great!? Good work! Thank you for your help along the way! I have struggled with tuning CVT's on the 70cc and now the 90+cc stuff. I think Part of the problem is they are so different from each other. My 70cc likes a stiff clutch and soft contra for it to pull my weight around. The 99cc is exactly opposite of the 70cc, it acts like a very soft clutch will work best, and a very stiff contra is needed to work for me. I don't know if it is because of the OR or what, but I intend to find out... Eventually. Sent from my SGH-T999 using proboards |
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Post by 2strokd on Feb 27, 2015 1:13:59 GMT -5
Both... The bigger pulleys help and the extra low RPM torque of the 90
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Post by Lucass2T on Feb 27, 2015 6:02:47 GMT -5
1500 Short contra spring on a ball bearing base How does that ball bearing base work for you? Im really interested in difference between normal and a bearing. Never used it myself before and im curious if it's worth the money. |
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Post by oldgeek on Feb 27, 2015 6:16:11 GMT -5
1500 Short contra spring on a ball bearing base How does that ball bearing base work for you? Im really interested in difference between normal and a bearing. Never used it myself before and im curious if it's worth the money. It seems to help smooth out shifting a bit but I don't think there are any performance gains. You cant use it with many long contra springs because the extra room it takes up can cause the pulley to not open all the way. I like using the BB base with a stock contra spring on a 70cc because it stiffens the spring up just right for me. |
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Post by oldgeek on Feb 28, 2015 20:05:35 GMT -5
I am nearly done trying to make this BWS 100 setup work as good, let alone any better than the Hoca variator, and a stock contra. I have tried many combinations, and I have not hit on anything magic. Apparently my 99cc motor was not a good choice to try this stuff on because the larger motors have a reputation of not liking any type of OR. Eventually I will be trying the BWS 100 CVT parts on a 70cc scooter, which is what I should have done in the first place.
I will try a couple setups using the hoca variator with the BWS 100 contra, and the BWS 100 variator with the stock contra just to see what happens.
I do want to mention something strange about the BWS 100 variator. Every time I disassemble the variator there is a coating of a tacky substance on the boss where variator rides. I clean it off and it is there again the next time I take it apart. I dont know what it is, and the bushing seems a good bit looser now than when I started.
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Post by 90GTVert on Feb 28, 2015 23:10:09 GMT -5
Maybe it has an oil impregnated bushing? Does it seem excessively loose or is there excessive damage like scarring or scraping on the boss or bushing?
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Post by oldgeek on Mar 1, 2015 5:36:05 GMT -5
Maybe it has an oil impregnated bushing? Does it seem excessively loose or is there excessive damage like scarring or scraping on the boss or bushing? It is not excessively loose yet, but it is too loose IMO for the short time that I have used it. No scarring either, but the stuff feels sticky like adhesive. I probably should stop cleaning it off if it it some type of lube! |
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Post by 90GTVert on Mar 1, 2015 8:43:15 GMT -5
I put an oil impregnated bushing in a stock variator for the TaoTao some time ago and I end up with a golden brown residue that's kinda gummy/sticky on the boss and inside of the bushing after a while. I assume it must be doing it's job because performance doesn't fall off so regularly as it did before that bushing and there's less wear.   When I was messing around with bushings I checked some variators for the 139QMB and 0.003-0.004" clearance between the bushing and boss was common. |
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Post by oldgeek on Mar 1, 2015 9:28:38 GMT -5
Yeah, that's the stuff I have been seeing, mine is a little darker though. I will stop cleaning it off. ☺
Sent from my SGH-T999 using proboards
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Post by Corrosion on Mar 1, 2015 9:36:07 GMT -5
If it doesn't get on the belt. Look the other way.
An Old Timer, I used to work with in My transmission days. Used to take a new pilot bushing and quickly warm it with a propane torch, to make sure it would sweat some lube. Before he would trust it.
Damm... Now I'm the old timer.
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Post by oldgeek on Mar 1, 2015 19:26:16 GMT -5
Well I tried many setups today using a mixture of bws 100 and stock parts. Very little success as far as I am concerned. I may be able to see a small gain with a slightly longer belt than the 788 17 28 I tried.
I decided it was time to switch back to the Hoca variator, and the stock rear pulley. Of course I forgot the setup I used with that combo, so I tried a bunch of stuff, and the best I saw was about 53mph. WTH! To make testing even more annoying there was a misting rain most of the day.
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Post by 190mech on Mar 1, 2015 20:41:15 GMT -5
I always cuss CVT's,but once they are right,nothing can keep up with 'em!!  |
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