Mini Turbo

[Herrmanator8]

Has anyone out there tried to put a micro computer fan on their intake, on a 2 stroke happytime? I think that if it was connected to the engines powersupply, via "the white wire" the fan speed would fluxuate with the engine speed as it generates electricity through the magneto.

reply to this thread and share any experiences with this sort of thing..

Jon

 

[JemmaUK]

Its an interesting idea although most processor fans run at either 3.3v or 5v so you'd either have to drop the voltage or use a fan rated at 12v - I am this point assuming the chengines electrics are 12v. 6 volt wouldnt be a problem

The question would be I guess whether the output of the fan would make any real difference - and having worked in computers I think it would make a small one, the issue being whether the adjustability on the carb is fine enough to set reasonable mixture with the additional intake pressure.

I think to be honest the best thing is to try it and see... I would however suggest that you somehow (if possible) mount the fan on the inboard side of the carb so it acts like the old type rootes blower as fitted to the bentley 4 1/2 and 8 1/2 cars. This way it helps mix the fuel air as well as pressurising the induction charge - you might want to run the carb one click richer if needed

The major issue is whether it would have enough output to lower the inherant charge loss when the ports open - if it can do that then you should have some noticable performance changes...

Jemma xx

 

[JemmaUK]

Hi,

I just had a look and there are some processor fans that come with heatsinks (remove and resell on ebay) for about $40 that put out 54cfm @ 12v

This would be perfect assuming that the chengines are 12v

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1389576&CatId=493

that is rated at 60cfm

For a 6 volt any 12v fan *should* work but at half the rated power


for 3 volt look at

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=2414550&CatId=493

I think the variac power idea is a good one - ie varying power input for different engine speeds - lessens the chances of leaning out at certain rpm bands...

good luck

Jemma xx

 

[stude13]

what she said!!!

 

[Phil_McCracken]

Try it but your wasting your money, you never will be able to blow enough air with a pc fan to make a boost condition, you will probably only restrict air flow.
The atmosphere is around 1 BAR or 14.696 PSI, its a physics thing, the internal combustion engine doesn't suck air in, a low pressure area in the venturi causes atmospheric pressure to be forced in to the engine. (about as simple as i can make it )
To make a boost condition you need to blow more than 14.7 PSI, anything over (eg. 15.7 PSI) is 1 PSI of boosted air flow.

 

[ozzyu812]

If your going to try it. The Vantec Tornado is the most powerful. I have one. If I had an HT I would go for it. No disrespect to Phil.

I believe calling it a turbo may be inaccurate but WTF it may help.

A potentiometer may turn down the voltage. If the ppl at Radio Shack are still knowlegable they could help with the voltage step down.

92mm
Fan Speed: 4800 RPM
Air Flow: 119 CFM
$14.99
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=674636&CatId=494

80mm
Fan Speed: 5700 RPM
Air Flow: 84.1 CFM
Also $14.99
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=674635&CatId=801

Check newegg for free shipping.

 

[fastboy9]

There is a lot of people trying to sell plans for an electric supercharger (essentially the computer fan idea but on a bigger scale). It would have more of a ram air effect than a boost effect as the pressure wouldnt be that much. Its definetely worth a try though. I've got a few fans laying around.

I'm sure this is a stupid question, and I feel dumb asking it, but how can you run anything on the white wire? Wouldnt you need two?? Positive and negative? Or am i missing some incredibly obvious lol

 

[Phil_McCracken]

You would just earth to the motor, I have seen the electic stuff, do a search and you will find plenty of tests that prove it doesn't work.
You would gain more from a ram tube, even pointing the carb forward will have no affect because you will never go fast enough.
Have a look at big super sports bikes, they have large plenum air boxes (2 - 3 - 4 litres) with ram air, they only get a small power increase at high speed (over 100mph)

 

[Bogaurd]

I have to agree with Phil, while you should be able to get the fan spinning by running it off the engine, you won't be able to generate enough pressure to increase performance, especially running a computer fan at the 6v or so you'll get off the magneto.

Fans are good for moving air about, and can achieve good flow rates if used correctly, but they are not good at providing any soft of significant pressure levels - blowers (superchargers and the like) which are designed to provide high positive pressures operate using impellers rotating very fast with extremely small tolerances.

Unfortunately I don't think it's an idea that's worth the trouble it'd be - think of all the air/fuel issues you'd have!

 

[imperfectionst]

Computer fans have no torque, it wouldn't work at all.