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Post by Deleted on Mar 8, 2012 19:39:47 GMT -5
I just don't think rider weight should bust belts. I dont think so either. I think its the heat created by that motor and the load being applied on that motor that created even more heat and that heat broke the belt(s) not the load itself. Heat is the great enemy here. If the heat can be dissipated the good quality belts will survive much better IMO. |
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Post by Deleted on Mar 8, 2012 19:53:20 GMT -5
Air cooled VWs heat the cabin with air from the fan. ducting from the fan shroud would go down to the 'heater boxes' that were basically a big pipe that had the header pipe going through it. the air would blow past the header pipes thus heating it then it would flow into the cabin.
We used to cap these off at the fan shroud and install electric 3 speed ' squirrel cage' fans on the firewall on the inside then on the other side (engine compartment) put ducting from the fans down to the heater boxes that way. Main reason for this is the flow of air with the stock setup was only good when the motor was revving and the defroster didnt work well because of this.
I have envisioned using this concept to boost engine and cvt cooling on our beloved little scoots. If one were to remove the stock fan and do some plastic work to cover the stock fan intake then mount a squirell cage fan...say under the floor oposite the battery box, run the intake to the fan up front in some manner possibly... perhaps a ram air setup..then run ducting to the engine shrouds and with perhaps a 'Y' fitting run a duct to the cvt cover as well, CFMs to the engine and cvt would not only be constant but I imagine much greater volume...especially the cvt.
Perhaps just do this for the CVT alone....?
Lend me some of that grant money if you ever get it lol
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Post by 90GTVert on Mar 8, 2012 20:49:38 GMT -5
I don't really see the need to use anything to force air to the CVT. Just opening up the CVT cover does a lot. The 4T doesn't run a bearing support like the minarelli does, so you can just cut a hole where the clutch is. The clutch is by far the biggest heat source in there. Even my little vents on the outer edge of the bell area do a lot. They can take a CVT cover from being hot enough you pull your hand away to just being warm. I've rode in pouring rain before without a problem. I did ford some water I had no business in and that kinda screwed me up with slip for a bit, but that was basically just me knowing better and not caring. If you do ride in rain a lot though, I'd try and be more conservative with vents.
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Post by Deleted on Mar 8, 2012 21:01:27 GMT -5
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Post by Deleted on Mar 8, 2012 21:10:00 GMT -5
here is one on a race car for cooling the brakes  |
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Post by Deleted on Mar 8, 2012 21:47:52 GMT -5
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Post by larry001964 on Mar 8, 2012 23:45:28 GMT -5
I don't really see the need to use anything to force air to the CVT. Just opening up the CVT cover does a lot. The 4T doesn't run a bearing support like the minarelli does, so you can just cut a hole where the clutch is. The clutch is by far the biggest heat source in there. Even my little vents on the outer edge of the bell area do a lot. They can take a CVT cover from being hot enough you pull your hand away to just being warm. I've rode in pouring rain before without a problem. I did ford some water I had no business in and that kinda screwed me up with slip for a bit, but that was basically just me knowing better and not caring. If you do ride in rain a lot though, I'd try and be more conservative with vents. Well I believe 1Fastqmb is talking about a recent failure I had when my Kevlar belt melted to shreds, even my cvt cooling fan melted.. I had posted pics of this failure along with the variator failure on scootdawg.. Heat was definitely the problem, drove 22 miles in some pretty hard headwinds, 20 to 30 mph gust before this failure, surprisingly I was making 45 to 50 mph and was not at wot..  Here are the holes I cut in my cvt to allow better cooling, I'm not done with it yet, I know it's still pretty rough, it will be a lot nicer and professional looking when I'm finished. I plan on a metal screen over the holes, sort of like the screen in older screen doors.  |
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Post by 90GTVert on Mar 9, 2012 8:31:27 GMT -5
A little time with a file will clean that up good. I've never seen one melt things unless something was wrong. If anything is causing the belt to slip (old worn belt, grease or something on the pulleys, contra getting soft over time), that builds heat like crazy. Same with clutch slipping.
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Post by Deleted on Mar 9, 2012 11:30:18 GMT -5
more fire means more heat and this motor is twice the size a stock motor is but the cooling system is still stock. I would be thinking outside the box on some cooling ideas (I am for the one i plan to build anyway.)
I am beginning to wonder if this combo would ever be a realistic streetable ride for anyone even if they weighed 100 lbs.
I wonder what cfm the fans on qmb and qmj motors put out?
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Post by larry001964 on Mar 9, 2012 12:25:09 GMT -5
more fire means more heat and this motor is twice the size a stock motor is but the cooling system is still stock. I would be thinking outside the box on some cooling ideas (I am for the one i plan to build anyway.) I am beginning to wonder if this combo would ever be a realistic streetable ride for anyone even if they weighed 100 lbs. I wonder what cfm the fans on qmb and qmj motors put out? It's interesting you bring that up fast, I bought the Hoca high performance fan for this, but in truth I don't believe it blows any more cfm than the stock maybe even less than stock... I think by looking at it that it's designed more for low drag not more cfm.. But when I bought it I was thinking more cfm.. I'm thinking of finding a squirrel cage that will fit and putting that on it.. I did give cooling a thought. The stroker is new, and to my knowledge there are no kits built around this crank yet, so it's trial and error finding the right components to make it work. But I'm still sure it can be made to work.. Maybe I should get a Trailtech or something to get an idea of the temps I'm dealing with.. Also it would tell me if a cooling idea it is being effective.. |
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Post by Deleted on Mar 9, 2012 16:08:45 GMT -5
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Post by Deleted on May 16, 2012 16:47:37 GMT -5
Had my 2nd breakdown today. (1st time was battery died from a bad r/r overcharging it).
My blue TZR50 HP cdi died...been on there 1 yr. Swapped to my orange box i keep taped to the frame for just such an occasion....and drove on.
Always keep a CDI with you!
Mechanically she is as fast and tight now as she was when I built her.....4734 miles so far. Only things i have done is a new variator, rollers and belt...due to serious wear. this was at about 4200 miles.
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Post by 90GTVert on May 18, 2012 11:01:08 GMT -5
Mounting another CDI, especially if it's within distance to just plug in, is a really cool idea. One of those things you will likely never need, but if you do you feel like the smartest person alive when you just swap wires from one to the other. ;D
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