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Post by Pony66 on Sept 15, 2011 16:54:47 GMT -5
Its raining at the moment, so I carved up my fan cover. I made a nick in the bottom, so it wasn't perfect. It may or may not improve cooling however it was fun and looks cool. Obviously, I was thinking of improving air flow. I angled and beveled the leading edge. I used a couple files to remove material.   |
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Post by Scooter Elements on Sept 15, 2011 17:03:37 GMT -5
here is mine Attachments:
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Post by mechaniczman on Sept 15, 2011 18:30:41 GMT -5
Do you have a Band-Aid on your tire? HAHA
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Post by Pony66 on Sept 15, 2011 21:37:15 GMT -5
Do you have a Band-Aid on your tire? HAHA It sure looks like it ;D You have a great eye for details. |
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Post by Pony66 on Sept 15, 2011 21:39:29 GMT -5
I can see how removing everything would be ideal for air. It looks like you removed half the blades from the fan. Could you let me in on your fan mods? |
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Post by yoshidawg on Sept 28, 2011 8:35:16 GMT -5
Did similar mod but took my fan off and painted it red with a clear coat, awesome!!! Make sure you keep it balanced. Oh yeah I did actually notice a little difference in performance.
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Post by Scooter Elements on Sept 28, 2011 9:18:27 GMT -5
I can see how removing everything would be ideal for air. It looks like you removed half the blades from the fan. Could you let me in on your fan mods? It was actually a bunch of people at the drag strip that told me about it that it improves airflow. i never thought about doing it until they told me. |
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Post by Pony66 on Sept 28, 2011 9:57:25 GMT -5
Thanks for the reply Scooterparts3.
I think I will buy another fan and start cutting. Do you think cutting out half the blades will work on the 50cc fan?
I dont have cooling issues, I just like to mess around with stuff.
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Post by Scooter Elements on Sept 28, 2011 10:00:16 GMT -5
Thanks for the reply Scooterparts3. I think I will buy another fan and start cutting. Do you think cutting out half the blades will work on the 50cc fan? I dont have cooling issues, I just like to mess around with stuff. mine doest have cooling issues either. lol i just did it beacuse the guys that race scooters at the drag strip told me about the tip. they said to remove every other fan blade and cut the center out.  pretty sure it will work for the 50cc fan. the fan might be a little smaller but same thing i think |
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Post by yoshidawg on Sept 28, 2011 10:35:40 GMT -5
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Post by Scooter Elements on Sept 28, 2011 10:41:48 GMT -5
dude the first one from scooterparts.net is the biggest piece of sh!t ever made! anyone on here will tell you. i stopped selling them in my store a very long time ago. and the second one i have never seen one like that. |
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Post by yoshidawg on Sept 28, 2011 12:04:21 GMT -5
I don't have that exact one but it's similar, but with only 3 holes, Not sure why you don't like
It??? It's definitely lighter than the second one. That one came off my 04 TNG, tried to sell it to get my 10$ I paid for my replacement. Decided I'll keep it for now. You keep mentioning you sell or sold...Link me up!
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Post by swakk on Oct 4, 2011 14:00:06 GMT -5
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Post by mainepeace on Oct 4, 2011 14:54:53 GMT -5
Very interesting reading... the French...
Definitely makes sense that a bigger intake hole will help overall airflow. My guess is that if airflow was REALLY a big issue someone would come out with an aftermarket shroud that would just screw on and would flow more air. When it's hot outside, I'm sure that a RAM scoop would help the intake flow at least a tiny bit. However, to be effective the scoop would have to protrude out into the airstream. Possibly an intake scoop on the front fascia?
Heck, one could make a water-cooling shroud that would screw on, be self-contained (like water cooling for PC's) and through contact with the fins could give you the cooling benefits yet not require extensive modification. A really adventurous person could make a custom jug that has passages for water cooling welded onto the fins. It actually wouldn't be *THAT* hard to do. Just cut off the fins and solder on copper piping that circles the jug, then fill in the spaces with some more liquid copper to create a good heat sink.
However, I'm not convinced that overheating is really a big issue except for a small number of people.
I'm all for the Frenchie's idea of using a PC fan grille. It definitely would flow more air and would keep OUT the odd rock or bug from being sucked into the shroud.
Greg
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Post by mainepeace on Oct 4, 2011 17:49:53 GMT -5
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Post by TERRA NUVO on Oct 4, 2011 19:45:22 GMT -5
great post fellas you guys rule!!!!!! pull half those slats out of the fan cover and pull em off bottom too, make a hi-flow filter for the CVT and you will have a faster bike because you will have a cooler bike. KEEP YOUR FINS CLEAN WITH CARB CLEANER BUT WATCH OUT SPRAYING THE PICK UP COIL ETC. AND YES THE BORRONATED OIL IS THE FINAL MOD TO EXCELLENCE WAS ANY ONE ABLE TO UNDERSTAND THAT FRENCH POST, WHICH FAN PROVED THE BEST?  |
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Post by mainepeace on Oct 4, 2011 20:32:38 GMT -5
It was a bear to read, but the graph is self-explanatory. The guy measured that Configuration 4 gave the best overall airflow (on a stationary system), flowing 42 (kmh?) at 5000 rpm. Config 4 is the stock fan with major cutting and the total removal of the fan grille.  Greg |
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Post by mainepeace on Oct 4, 2011 20:37:38 GMT -5
Squirrel cage fans are notoriously inefficient. Perhaps someone should look at a GOOD hi-flow impeller design for greater CFM's. There might even be a ready-made set of blades that can be swapped on.
Greg
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Post by swakk on Oct 9, 2011 16:50:07 GMT -5
the advantage of being one of the last of a defunct species (french people) is that we learn to communicate (even in a poor way) with others , to be less alone... ( lol )
sorry for the delay
the more efficient colling system is number 4 in summer and 1 in winter (to allow the motor to heat) ....
for the "roller" you have all the detail to make your own by a specialized shop, this give you less vibrations and a longer belt life
and a big thanks to Scrappy for it's nice pictures and informations...
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Post by skuttadawg on Oct 11, 2011 21:29:31 GMT -5
So do the open design of performance fans improve air flow ? Stock seems to have a rim where others do not
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Post by drake0093 on Oct 12, 2011 9:03:03 GMT -5
i have a smaller opening in my fan cover but am also wondering if just taking the fins off of the cover will help on mine?
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Post by Pony66 on Oct 12, 2011 9:43:01 GMT -5
Mine is a 50cc as well. The research and pics later are 150cc.
I dont have the gray matter to install an air meter and do tests like the French guy.
The design of the 50cc fan is a little different but the both have the wide ring on top.
I have an extra stock fan that I will file off the ring. Im sure cutting out the slats on the fan cover would only help. Im going to cut out the rest of the vertical slats. I like the look of the horizontal only. Im sure eventually I will just have an open hole with no slats.
I know this is silly but, i may put a small LED in the fan cover. I think it would look cool at night to see it glowing in there. I may paint the fan as well.
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Post by drake0093 on Oct 12, 2011 9:58:38 GMT -5
i'm sure that would look sweet!!! let us know how it works. i think since its raining out i may just go to the garage and do some fan mods myself as i'm waiting for new gaskets for my BBK
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Post by swakk on Oct 15, 2011 15:58:59 GMT -5
50 or 125 or more don't matter
it's the same design
by doing the same job you will have a good improvement
about the racing fan, we tested one some days ago... a real scam, this was one made for 50cc, the wind was metered at 20 km/H with the racing fan instead of 40 for the standard fan...
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Post by rkcc on Oct 15, 2011 19:56:24 GMT -5
This is a minor tangent. Many of the folks who play with modified chainsaws have lightened and removed fins from the flywheel/fan for a long time. Less rotating mass means quicker throttle response and a modest gain in usable power. I have a Kart powered McCulloch that has no fins/vanes at all, but it does not get any prolonged use, 30-40 seconds at a time. Yes, I have seized it  |
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Post by yoshidawg on Oct 16, 2011 11:08:02 GMT -5
Put this lighter fan on, cut a couple fins. I noticed the throttle response right away. Measured the CFM's with my hand , it's blowing plenty hard. My 50cc has probably 2.8 HP I need as much of it as possible to go to the rear tire. Attachments:
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Post by Fokus on Oct 19, 2011 12:54:32 GMT -5
It's not rocket science. Reduce the fins or use one of the "performance" fans and you increase HP by simply reducing the drag on the engine, it take HP to move the fan. The performance fans are for racing to give just enough air and not melt down the engine but giving all the HP to the back wheel instead of a fan blade. But in the heat of the summer on a long drive you'll be on the side of the road letting it cool down or pushing it with a blown engine. Want maximum HP remove the whole thing. The reason #4 is the best at cooling is it removes the obstructiing grill to let the fan do the maximum amount of cooling but it will also decrease HP. The more air it pushes the more HP need to do the work. The fan was designed to meet a happy meduim in all temperature ranges. One also need to remember these engines were designed to run at a maximum HP to rpm curve at under 8k and while decreasing the load on the engine will give more immediate HP running them over the long haul at increased rpm will make them a short lived adventure. Racing one wants all the HP one can get and fan reduction is a simple fast method but that's also whay racers rebuild a lot.  |
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Post by Scoot Tech on Nov 11, 2011 13:50:23 GMT -5
What about removing the whole thing and installing an electric fan? Like a computer fan? How many cfm's should it be?
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Post by swakk on Nov 11, 2011 19:17:30 GMT -5
a LOT!
and a BIG battery, to feed it, and a charger to charge the battery
because, otherwise, you must improve the stator / rotor and lost a lot of energy by converting mechanical forces to electric and back to mechanic....
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Post by mainepeace on Nov 11, 2011 20:47:15 GMT -5
You could just design a duct that goes from the side of the scooter to redirect air while you are moving. That way, you only need to worry about moving air at idle, and an electric fan should provide enough CFM for that. However, you're talking about such a small gain that just doing a GOOD port job would give you more than enough to compensate.
Greg
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pretty sure it will work for the 50cc fan. the fan might be a little smaller but same thing i think
