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Post by niz76 on Dec 28, 2014 20:38:48 GMT -5
Your scoop definitely has merit as far as keeping things cooler. Check out this thread from 90GTVert: 49ccscoot.proboards.com/thread/394/homemade-cooling-fan-air-scoopIn another thread he shows temp differences from different mods including the scoop I believe? The scoop helped cooling no doubt. Can't seem to locate it at the moment... |
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Post by Sitticuss on Dec 28, 2014 22:23:31 GMT -5
What if you remove the engine shrouds and the mechanical fan. Then installed an electric fan blowing directly from front to back?
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Post by Clank on Dec 29, 2014 5:08:23 GMT -5
Use a cooler plug. Instead of a 7 use a 8. I got that from the birdman. |
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Post by lansingscootguy on Dec 29, 2014 8:05:07 GMT -5
Please explain usinusing a 8 instead of a 7.
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Post by Clank on Dec 29, 2014 8:16:55 GMT -5
Most scoots use a NGK CR7HSA. A NGK CR6HSA is a hotter plug and a CR8HSA is a cooler plug. The heat range is based on the depth of the detonation ring which the open area around the electrode going into the threads of the plug. Bigger area hotter plug and vise versa. Look up spark plugs in the TECH LIBRARY for better detailed definition but that's the just of it.
A hotter plug can cause pre detonation and is reported that a cooler plug is better for extended WOT riding.
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Post by 90GTVert on Dec 29, 2014 10:21:37 GMT -5
In another thread he shows temp differences from different mods including the scoop I believe? The scoop helped cooling no doubt. Can't seem to locate it at the moment... Project 90 uses the cooling fan that it came with. It's a typical minarelli cooling fan, found on 49cc and 90cc engines. There is a larger version that moves more air, and I happen to have one. I've only seen these on 90cc minarelli engines. The size difference is obvious.   I don't think these will fit under all cooling fan shrouds. Both of my long case Vento Tritons appear to have extra room under their stock cooling shrouds with the smaller fan in place. The larger fan fits perfectly. My other 2T scooter, the Keeway Venus, does not have this extra space under the fan shroud. Before you consider picking up a larger fan, have a look at your shroud.   I also decided to try out a cooling fan air scoop that I made a long time ago. The idea is that it "scoops" up air when riding at speed and helps to move it across the engine. I should also note, my "stock" fan shroud has had the grill removed to create the maximum open space.   You can find more info about the cooling fan shrouds at the links below. 49ccscoot.proboards.com/index.cgi?board=gentech&action=display&thread=39449ccscoot.proboards.com/index.cgi?board=gentech&action=display&thread=393I evaluated each setup with three bits of information. I began with idle temperature. I let the engine idle at 1,300RPM until the gauge reached it's minimum mark at 140 degrees. Once it was at 140°F, I let it idle for exactly 10 more minutes and noted the temperature. I also used two different riding conditions to measure the performance of the fan setups. For each test, I rode for 2 miles at wide open throttle and noted the readings. I stopped at a landmark (driveway) to assure I traveled the same distance each time. I then turned around and cruised home at 40MPH and took note of that temperature. Here are the results. Fan | Shroud | 10min Idle | 2mi 40MPH | 2mi WOT | Stock | Stock | 185°F | 350°F | Max | Large | Stock | 155°F | 290°F | 340°F | Large | Scoop | 160°F | 280°F | 325°F |
As you can see, there is a sizable temperature drop with the larger cooling fan across the board. Riding temps continued to decrease with the addition of the air scoop, other than at idle. The idle temp increase with the shroud could be a very slight restriction from the length of the scoop or it could just be a fluke. None of the idle temperatures concerned me, so I opted to use the large fan and scooped shroud for the rest of the project. The down side of the larger fan is that it should create more drag on the engine and could have a negative impact on throttle response. I didn't notice either of these effects. I'm sure it makes a difference, but for a street ridden scoot I feel that the temperature drops are well worth a loss in performance that you probably won't even notice. I got my large-finned cooling fan from a stock 90cc Triton engine. If you wish to pick up your own, I would suggest searching eBay or retailers of 90cc ATV parts. I have heard that some do not fit. I'm not sure if it's merely a shroud clearance issue, as I showed you before, or if there is more to it. There are aftermarket fans made as well. Parts For Scooters carries a Hoca "turbo" fan, part # 169-142, that appears to have a little larger fins and is available in different colors. |
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Post by birdman on Dec 29, 2014 11:46:49 GMT -5
Im running an oversized fan just like that on my Jog with great results, albeit I had to trim my shrouds to accommodate the new fan.. Didnt fit in like 90's did.
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Post by iwannascoot on Dec 29, 2014 14:41:06 GMT -5
Anybody using these on their 139qmb 50cc?
Billy
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Post by lansingscootguy on Dec 31, 2014 19:30:44 GMT -5
 I saw this one on eBay. Gonna buy it I think. If I can get my piece of junk running right that is. |
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Post by thatcrazyguy on Apr 8, 2015 7:56:15 GMT -5
I will definately beusing Brents walk-through to add this to my scoot!
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Post by screwthe49ers on Jul 9, 2019 2:57:38 GMT -5
Old post but relevant to me. What's a good recommended fan that's available now?
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Post by screwthe49ers on Jul 9, 2019 18:56:45 GMT -5
I don't think you'd notice any gains unless you could eliminate the fan or use a smaller fan because of the scoop. As long as the scoop is at least as large as the inlet on the shroud and catching air it should improve cooling vs the exact same setup without the scoop when moving. Even if you could make it really efficient when moving so it would cool the cylinder, I don't see how you'd get it to work at idle when there's no airflow and with much less flow from the fan or without a fan. Do you still run with a pvc scoop today or recommend doing so on a stock 50 gy6? |
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Post by 90GTVert on Jul 9, 2019 22:51:30 GMT -5
It would be fine on even a stock scoot. I don't have one on my TaoTao, but I used one on the last GY6 that I had and I used a scoop on my 2T up until I changed to liquid cooled.
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