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Post by scooterelements on Jul 24, 2013 11:57:36 GMT -5
So a little bit ago someone started a thread about those racing fans that overheat engines. I found another type of fan that looks stock but suppose to be better and i posted a link to it and pics and people from here said the blades were reversed. So i send the manufacturer a message telling him what others have said about the fans and this was what he wrote me back today. What do you guys think? Dear scooterelements, Dear Sir, I had to tell you one secret, the GY6 old stock cooling fan was a wrong design about 30 years ago, that's why GY6 engine always overheated. The old stock fan would inhale the hot air into the engine while it exhaust the hot air, so the engine always inhale hot air, there are no cool air into it, so the engine would be overheated. That's why now many scooter factories in Taiwan who use GY6 engine (like SYM) change the old stock cooling fan design, the new stock cooling fan is clockwise design, like ours fan (you can see as follw photo). Our high flow cooling fan blades were calculated and tested very precisely when our engineer designed them, so it never become what you said. To see is to believe, i can present some our cooling fans to you for testing, but you have to pay the shipping fee. I believe that if you test them, you will love them, and never use the old stock design. How do you think about? And do you know propeller is one of our products? So scooter cooling fun is a piece of cake for us. Waitting for your response.  |
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Post by jeepsteve92xj on Jul 24, 2013 12:03:55 GMT -5
The fins are reversed from the stock FAN, as much as they look like FUN.
I would like a better fan. I still need to fashion scoops - both of my scooters have body work in the way.
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Post by scooterelements on Jul 24, 2013 12:16:06 GMT -5
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Post by jeepsteve92xj on Jul 24, 2013 12:54:17 GMT -5
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Post by scootnwinn on Jul 24, 2013 13:14:24 GMT -5
if that causes it to suck from outside and blow in it might just be a great idea. Give it a try like he says
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Post by jeepsteve92xj on Jul 24, 2013 13:49:45 GMT -5
I think a tube PVC, maybe reduced a little - with a simple manometer could give an idea of intake airflow. It doesn't need accuracy, it just needs to be able to show a difference.
I may see if I can wiggle a Bar-B-Que thermometer into the plastics. The probe is a little large.
Oh - my multimeter has a thermo-whatchamacallit that would work.
I just need the different fan to test.
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Post by sailracer on Jul 24, 2013 15:42:52 GMT -5
I think a tube PVC, maybe reduced a little - with a simple manometer could give an idea of intake airflow. It doesn't need accuracy, it just needs to be able to show a difference. I may see if I can wiggle a Bar-B-Que thermometer into the plastics. The probe is a little large. Oh - my multimeter has a thermo-whatchamacallit that would work. I just need the different fan to test. COUPLE -thermocouple. you must've had a brain cramp cuz you said manometer, but forgot how to say thermocouple  let us know the temp difference |
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Post by jeepsteve92xj on Jul 24, 2013 17:32:25 GMT -5
i just need the fan(s) to try.
couple - Thought that word was in there someplace.
I wanted to use a much larger word, so I crammed that all together.
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Post by jerseyboy on Jul 24, 2013 19:01:57 GMT -5
The new design may be better,,they draw cool air through the engine from the opposite side(underneath the scoot where there is cool air,,not hot air from exhaust area),,might be a better idea,,guess we need to test them on an engine that has a temp gauge,,or just dip the oil with a thermometer after a ride with each fan..
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Post by jeepsteve92xj on Jul 24, 2013 19:16:55 GMT -5
While I am working on my Xingyue EFI conversion, I drilled a small hole in the shroud left and rearward from the intake manifold. The thermocouple fit nicely.
Running for 10 minutes stationary at RPMs up to 7000, I saw 68C while running. After I shut it off and looked back after a couple minutes, I saw 93C and dropping. Now down to 85C.
I did not clamp the thermocouple to a fin, I just shoved it in a hole, and it should be between fins.
Stock fan, new EFI conversion.
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Post by sailracer on Jul 24, 2013 20:35:38 GMT -5
[replyingto=jeepsteve92xj]jeepsteve92xj[/replyingto]I wonder of one could further improve on the new type fan by cutting a few small air inlet slits in the shroud in various places  |
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Post by jeepsteve92xj on Jul 24, 2013 20:43:04 GMT -5
Took EFI scooter for a short ride to record data.
The outside air temp is below 68F
the thermocouple on my meter was just above 70C.
I was riding slow, residential area, nd still tuning the ECU, wouldnt want to run lean or anything.
After shutdown, it rose to 103C, and has already come back down to 72C
Extra holes for suction would still need to be on the left side of the motor.
I could imagine a new scoop at the fan side outlet, that is a venturi so it suck more air through the faster you ride. No matter how fast the fan is working.
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Post by jerseyboy on Jul 24, 2013 21:11:47 GMT -5
Anything to get it out farther from the exhaust header will work wonders,,I may get a scoop and try it,,cant hurt.
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Post by scooterelements on Jul 25, 2013 9:12:54 GMT -5
What i am going to do is order around 5 and choose some of you to test them out for us  I will let you know when they arrive. |
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Post by jeepsteve92xj on Jul 25, 2013 9:20:38 GMT -5
cool
I have my thermocouple set up. And a little baseline data.
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jet
