Increasing airflow to the engine/carb area.

Looks nice. No vents on the original?

Is that a plug above the vent?

Very professional install got the same problem with my new 50cc! Going to possibly add an oil cooler to it like I did on my Bali!

You'll have to be careful with any electrical addition on the 50cc scooters as they have the weak 6 pole stators most of the time! A complete LED change out will help that!

One can get lots of the little fans from a bad computer 3" and 4" most at about 65 to 90 CFM with less than 1/2 amp voltage draw! All computer fans are 12 vdc! I'm lucky as I have a computer repairman here and he throws away old bad units and I can remove the fans and useful plugs and wires for free! FREE IS GOOD! LOL JRR

Well I'll tell you how weak the sytems are Bluefront! Put the standard 1157 bulb back in and then take and put the scooter up on the center stand start it and let it idle and then take a rubber band and wrap around the brake lever where the bulb will be burning all the time along with the tail lights! Come back in say 2 or 3 hours and see if the scooter will start with the start button!

The 150's have two bulbs and if you have the brakes on all the time due to a stuck switch it'll drain the battery with you running down the road 50mph! The tail light side of the bulb draws 10 watts and the stop light side 5 watts = 1.25 amps! The average LED 1157 bulb draws less than 0.15 watt! So yes the bulb makes a difference for sure and even the little wedge instrument bulbs are 3 watt and I even replace them!

There are threads all throughout this forum of dawgs changing stators for more reliable power!

The little fans can fool you though! For instance I have two of these fans. They are easy to look up on the net if you have the name and model number;

www.globefan.com/12025.htm

I have two like the bottom one listed at 0.52 amp and 94.92 CFM a good little fan! But 0.52 amp = 6.24 watt so with the Led 1157 bulb change out you still have gained about 3.5 watts not a lot!

Now here is an interesting little fan! Look at the RPM!! 4200! Man that'll pull some air!

www.amazon.com/gp/product/B000YCUF72/ref=olp_product_details/191-1095820-4018852?ie=UTF8&me=&seller=

Again these scooter charging systems are very marginal! JRR

Jrryan,

This is probably going to sound like a stupid question but I will ask it anyway (wouldn't be the first time for me). If I were to install a old computer fan to help keep my engine cooler and I mounted it behind a vent like in the picture above, would I mount it so it sucks in fresh air and blows it into the engine area or do I mount it so that it sucks the hot air out of the engine area? Hope this makes sense.

Yes had a typo on the bulb. sorry about that but that was an usual bulb as most are rated 10W on stop and 5W on tail, may have been a special brighter bulb due to the fact it has only one bulb! And yes that's what I said if the brake light was on all the time even going down the road at 30MPH the battery would drain especially with a 21W rated bulb! Replace the blinkers too as all four of them are rated at 40W total and if you did have to use your emergency flashers they wouldn't work long with pulling 40W plus they are brighter and brighter is safer! Wedge bulbs, my 50cc has two on the instrument panel on all the time = 6W replace with LED's = 0.25W ! Every tiny bit helps! Last but not least when little 7AH battery gets weak replace with 12 to 14AH sealed battery and then your electrical situation will be a lot better!

Now on the air Bluefront it right and as an expert in aerodynamic air flow and a air duct designer the effect of the little computer fan will be minimal but just like the LED's every little bit helps!

www.amazon.com/gp/product/B000YCUF72/ref=olp_product_details/191-1095820-4018852?ie=UTF8&me=&seller=

Now you take this little fan it runs at 4200 rpm but only pulls 1.4W so this tells me that the blades even though they are turning at a high rpm are not pulling or blowing much CFM which is what actually does the work as far as cooling goes! The design of the blade determines the CFM output and how much current it will draw. The more CFM the greater the current draw!

One can look up the specs on these little fans on the net and get all of the info on any fan. They did not list the CFM on this little fan but I will find out!

So with all this said what one wants is;
(1) The most CFM you can get in a size that will fit the area you're installing it in
(2) lowest current draw with the most CFM so you won't overload the charging system


Going down the road at higher speeds the little fan won't make a difference but when going slow and stopped at a red light on a hot summer day it will help!

BTW mount the fan with it pulling air from the outside and discharging toward the engine for best results! JRR

i thought of the supercharger too.it would be kool.great job on the vent.looks good and has sum style to it.if anyone finds "superchsrger"or ram air setup let me know,im tinkerng in my head but i bet it could be done.

very true,however wouldt it be kool to supercharge a scoot?but reality is not practical.check tis out........http://www.alibaba.com/product-free/105923574/Supercharger_Kit_for_50cc_motorcycle_moped_scooter.html

thats wat im talking about!!!!just a little squirt.hehehehe.....got some planning to do.

Look.....before you charge willy-nilly into this fan thing, I suggest you read up on the subject. There are plenty of differences between these fans. Depending on the blade design, not to mention the motor, the CFM and the pressure of the fan's output can vary quite a bit.

And there are some fans that would mount easier. I've seen small fan designs where the motor was inside a tube, rather than the typical computer fan housing. This would make attaching to the carb...much easier. These type fans are used in automotive racing applications.....like to cool the brake rotors.

Overall though.....I wouldn't waste my time. Now using a small fan to cool the engine compartment, has possibilities. There's enough room at that location to enlarge the opening enough to mount a 120x36mm server fan. Some of those can go up to almost 300CFM.

Oh.....I've got a box of those big server fans. One type is thermally controlled. (as it gets hotter the fan speeds up). You can find these fans at a used computer store......my local place has them for $5-$10.

Bluefront...I think the fan in a tube you are thinking of is actually a blower fan for a boat. I think they come in 3 and 4 inch dia. in a boat they attach a plastic hose/tube to each side and place one end down in the bottom of the boat and the other end to an outboard vent. this is used to pull any fuel fumes out of the boat. I have seen these used by nascar guys, looks they are using them to cool the brakes and/or blow cool air on the driver. Somebody hook one of these up to a scoot carb, i wanna know if it does any good.

Not sure what you're getting at here. The engine fan sucks in air from the right side, and blows most of it out around the exhaust pipe. Very little of this forced airflow finds it way to the engine compartment and the carb area.

So if you're just sitting there in traffic, or driving slowly, the airflow through the eng compartment is greatly reduced......compared to driving along at normal speeds. This is where an electric fan, located where that vent opening is located, is helpful. In another post after this thread, I showed a 92x36mm server fan mounted in that opening. It works good......everything under the seat feels much cooler when the fan is running. Some people put a 120x25mm at that spot. Cheap cooling solution.....