I've heard about it, but I havent seen it.
Pics of modified puch clutch bells?
Re: Pics of modified puch clutch bells?
Try PuchMaxi.nl Tuning for reinforced clutches, lots of pics.
Do you mean the machined plate keeping the clutch dog post from bending?
Re: Pics of modified puch clutch bells?
no. The bell, aka the bowl shapped thing with the little gear attached.
Re: Pics of modified puch clutch bells?
how could you possibly modify that for the better?
Re: Pics of modified puch clutch bells?
speedholes.
Re: Pics of modified puch clutch bells?
Should have one to take a few photos of some time next week Zane.
Pulling rotating mass out of a e50 is my next machine shop project.
Re: Pics of modified puch clutch bells?
The only thing I've seen pro tuners do to the bell is to tig weld it at the center hub. This is probably the most worthwhile modification to the bell.
Re: Pics of modified puch clutch bells?
I'll just wing it and have some fun with the o'l drill press and rotary tommorrow.
I'll weight my original crank, clutch, bell, main gear, and sprocket before and after.
Re: Pics of modified puch clutch bells?
well, you should at least measure the hole sites as carefully as you can, right? if the things unbalanced, you'll burn up clutches pretty durn quick
Re: Pics of modified puch clutch bells?
Ouch, another Puch going out of circulation.
Re: Pics of modified puch clutch bells?
yeah really... i think 'speed holes' in the clutch is a waste of time, but welding the gear on is a good one. The parasitic drag from all of those holes cutting through oil would be a greater loss than the tiny little bit of weight you'd save. If you really wanted to get rid of some mass you could loose the starter assy and machine the part of the bell that extends out down. that would take it from the edge where it is most harmful.
Re: Pics of modified puch clutch bells?
Way ahead of ya Gram.
I wanted to see how much weight I could pull off a stock clutch assembly without completely compromising it's ability to take the abuse a clutch bell endures.
The Korado clutch bells all have holes where I machined mine. I'm not sure if the original intention was to save weight or to promote lubrication.
The stock clutch basket weighed in at 340g and the stock starter plate weighed in at 130g.
After a little work on a vertical mill with an indexing head you get this.
I decided that the starter plate did not need all the area provided to engage the clutch when you start the bike. Thus I machined off 3 of the 6 tangs that hold the starter plate. I also went deeper near where the clutch engages the bell (dictated by the wear marks on the bell).
Since I removed half of the tangs I also removed three fingers on the starter clutch.
Total weight on the basket is now 294g or about 14%
Total weight on the plate is now 83g or about 36%
Total weight savings is 20%
I will probably end up drilling 3 1/2 holes in the starter plate just because.
Next project is working on a clutch.
Re: Pics of modified puch clutch bells?
Good stuff. I'll expect these sort of innovative touches...
Re: Pics of modified puch clutch bells?
Good idea Paz! How large are the holes drilled into the clutch basket itself?
Re: Pics of modified puch clutch bells?
nice work, that is cool.
i still dont buy the clutch hole thing, just because i think parasitic drag is going to kill you. they could have holes in the korado to save on really nice expensive steel (unlikely) or to offer some sort of heat/stress relief (more likely) but i really dont think it would help weight savings at all. Lubrication.. maybe. The other stuff.. beautiful, thats really sharp.
i always love seeing your work paz, gives me warm fuzzies.
Re: Pics of modified puch clutch bells?
looks cool as hell, and well make sense,
My question is is too Lubrication an issue. slippage?
seems you may need to change the fluid more often.
I do like it a a lot nice going Paz!
Re: Pics of modified puch clutch bells?
hey paz when r u testing all that stuff out, don't tell me ur gonna do a bunch more shit and not install one thing at a time.
Need a test e50 maxi? i got a sick one!!! I'm really curious as to if its worth the trouble to take this weight away.
or if sticking to some skinny tires and light spoked rims is good enough.
Re: Pics of modified puch clutch bells?
Hey man if your down with throwing it in your bike I'm all for it. This will end up on my polini one speed but since I only have one bike frame fully assembled and have no real interest in pulling the ZA80 off the rigid... That and I have more projects and ideas of projects than I have time. Let me clean up the machining marks and I'll bring it into the city for you when I pick that motor up.
Thanks Gram I relish in making people feel fuzzy.
Jafer the 6 holes are .65" spaced 60
Re: Pics of modified puch clutch bells?
Re: Pics of modified puch clutch bells?
sweet paz, yeah bring it down maybe thrus or friday we can make some test runs.
Re: Pics of modified puch clutch bells?
I've seen vent/speed holes on RC car clutch bells many times. It reduces rotational mass and aids in cooling the clutch shoes. I'm sure the concept is exactly the same on a Puch clutch bell.
Re: Pics of modified puch clutch bells?
I like the cooling aspect as much as the reduction in rotating mass. These tricks are what prolong part life!
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