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Yes, I have read Warooms thread, it’s very interesting and he is very creative!
The inner-rotor used there is much smaller, why building a decent fan a bit easier.. the HPI is BIIIIIG, the rotor have a bigger diameter (62mm) than the Malossi/selettra, which is quite big aswell..
Both the malossi and the HPI will have bigger inertia and will not be as sensitive to stall due to misfire as the china-kit, but the china kit will due to lower inertia rev faster and making wheelies easier.It look like I will get the mockup of my fan printed this weekend, will post an update after that 🙂
Here is the diagram of the Rotor, will need to Cad it up to calculate the change of cone to lower it 2mm. 🙂
ROTOR SIZESA 17.00mm
B –
C 5.5°
D 4.5mm
E 33mm
Got theese photos from my friend… Yet have to pick it up and test fit, but we do have a mockup 🙂
For 3D printing, we made it a 2 piece fan that we’ll glue together, the final version will be solid.
Okey, so I started to CAD up the rotor, first is according to HPI how the rotor SHOULD be, and the next is how the rotor ACTUALLY is, as you can see, the rotor is out of spec. 🙁
I will send HPI an email and complain about this, I will try to save the rotor by remachining it anyway, if HPI wats to send me a new rotor I will be happy!
Today was mockup testing day!
The fan fits nicely between carter and stator!
Unfortunatly the rotor went bad when machining it, milled it to hard in bottom when trying to make space for even more lowering.. So I’ll need a new rotor, and a lesson is learned and was quite educatble slicing up the rotor, quite interesting build!JMPB didn’t have any CIAO rotors, so I ordered a Puch/zundapp rotor instead, itäs the same except for the cone, which was a very easy fix..
I think I need to find a original flywheel kappen, this one isn’t so good, bad fitment and the fan touches it in one corner..
Impressive work! I had the same problem with this vliegwielkap, the brand is equal but they are not so equal in comparison with the original kap 🙂
It looks good, green blends nicely with the black. I admire your perseverance. How strong is that printed plastic? Is this is only the template, or are you also driving with this flywheel?
As I rate the pictures I think the fan wont perform. The vanes on top of are too small to move air and the vanes on the side get too little supply of air. The air wil not,or will not flow enough.
Wilk1985 :
Impressive work! I had the same problem with this vliegwielkap, the brand is equal but they are not so equal in comparison with the original kap 🙂Thanks! I will try to get my hands on a original vliegwielkap and try with that! 🙂
@zevenenergie, thanks!
That green fan is only a mockup, only for testing the fitment and make adjustments for the final version. It became green just because that was the only color of the cheaper plastic my friend had :).
It’s a 2-piece construction so that I could analyze fitment better, at the end I glued to two parts, however it doesn’t have the durability of revving 13.000, it will explode I guess!I’m not sure I will go with plastic fan at all, but If I do, I will make it in ABS and 1-piece construction, it will become black then, not green. But most likely I will go for a billet-aluminium fan
I’m fully aware of that the design of the fan is long from optimal. My original plan was to run fanless, but I have realized that I will have to replace cylinder and piston very often then, hence doing my best developing some sort of fan. 😀
Given the conditions theres not room for a better construction of the fan for better performance. I elaborated yesterday with lowering the rotor more, to build taller veins but the rotor didn’t like to ripped that much.. =(The top veins are 2mm tall, the end blades att 21mm tall and 8mm wide.
I think it will move air, not optimal amount but that I will be better of than a fanless setup 😀I have ordered a new rotor from JMPB, they didn’t have the ciao rotor, so I ordered the Puch rotor, just need to adjust it, which I will have to do anyway 🙂
My next plan it to open the carter, see if I can press down the Vitom slightly and machine out the fitting, to allow the rotor to drop slightly.
Did also order a Volle wangen krukas from Mazzucchelli for better crankcase compression, I will also fill the inlet with metal epoxy to achive maximum compression in the crank case.
While ordering I accidently put a Gianelly Fire and some other stuff like gaskets and studsTook some better pictures of the fan inside the carter:
About 3 years since last update!
The Ciao is still in the barn, awaiting to mature. 🙂I bought a house 2½ years ago, and I haven’t had much time over for hobbys.. hopefully I will have more time now. 🙂
So finally the piece of aluminium arrived, its T7075. I bought material enough for 2 fans because I know that when I and the CNC operator have been drinking a bit, we will definatly fuck-up the first one, hence material enough for 2 fans 😀
Hopefully upcoming weekend we will mill the fan, if the women haven’t got other plans.Besides that, I couldn’t resist dragging this corpse home, its a minarelli Horizontal 2002, which have been laying outside for a couple of years.. The crank, oil pump etc is beyond repair.. But the mission was to take dimensions, so I will recycle the corpse soon.
The final version of the fan!
– Fins are directed the opposite way
– Made the centre part as a solid, due to tool size of the mill.Tomorrow we’ll be milling out the fan!
The corpse have served me well also, first 3D model is taking shape. I’ll need a Honda CR85 Ree valve as a donor so I can adapt the reed fitting.
You are makeing your one carter!
😛
Looks good in solidworks.Wauw thats looks goddamn Nice !! Cant wait to see the fan 😀
Work in progress, took about 3 hours to setup The tool path, now we have been running The machine for 3 hours. Still alot left, hopefully well be able to finish today..
1 hour later…. Now we will fine cut with smaller mill.
Taking alot of time, there is plenty of optimization possibilities though.
Hey how is it going, still in the cuttingroom?
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