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Old November 3rd, 2004, 12:11 AM   #1 (permalink)
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Building a Supercharger

For a goped...

What I want to do is take a stock air filter box, Make a thin foam pad to catch any dirt or anything, and put a fast rpm computer fan in there powered by a battery and switch. Run the wires and switch up the frame next to the kill switch so I could toggle it on and off. The increased airflow will increase the speed and horsepower for a limited time. I'm wondering if this would work right and I need some ideas on how to mount it want what not.

I'll have to sacrifice my K&N Filter but I don't mind it. I got a old filter box thats all ruined and I could mod it any way I would like to.

Please help me out.
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Old November 3rd, 2004, 12:38 AM   #2 (permalink)
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you can't force induct a 2 stroke
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Old November 3rd, 2004, 01:02 AM   #3 (permalink)
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yeah you'd have to increase the amount of fuel proportional to the amount of extra air you push in, and I don't think that'd be easy, if at all possible. but of course, it takes me a few extra strokes to get the job done, if ya know what i mean
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Old November 3rd, 2004, 06:49 AM   #4 (permalink)
 
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won't work. computer fans only push about 30-35cfm, which is NOTHING comopared to what an engine needs. i've already though about that idea for my ranger. just won't push enough air so don't even bother.
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Old November 3rd, 2004, 09:05 AM   #5 (permalink)
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and its a 2 stroke all of the boost from the intake will just be blow out of the exhaust port. waste of fuel and air
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Old November 3rd, 2004, 11:44 AM   #6 (permalink)
 
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yeah thats true also. wheres wat i would do. for fun, make yourslef a ram air for it. just make a hose or w/e w/ a filter that has the open end fowards. not that u can do much w/ a goped/moped ne way...though u can have some fun w/ them if it has electric start...oooo exaust flamethrower...
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Old November 3rd, 2004, 04:58 PM   #7 (permalink)
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We took a backpack blower and did this. It worked fine.

So is a computer fan not enough power? Would I need more than 1?

I'm going to focus on rewelding my pipe and building custom neons.
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Old November 3rd, 2004, 05:54 PM   #8 (permalink)
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a backpack blower moves a hella lot of air tho, at 100's of mph.
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Old November 3rd, 2004, 09:05 PM   #9 (permalink)
 
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yeah thats like the diff between a cesena and a boeing 777 in power there bro. and no, multiple fans will not help, each can only spin at a certian rpm, and at that certian rpm can only for x ammount. does it have electric start? if so i'd have some fun w/ it, it isn't hard ot make an exaust flamethrower out of it.
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Old November 3rd, 2004, 09:43 PM   #10 (permalink)
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No it's push start and Pullstart. I could rig an electric one for 200 bucks. :-/
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Old November 3rd, 2004, 10:11 PM   #11 (permalink)
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Make sure you don't lean out the fuel ratio too much, a little lean is where the most power is produced in two strokes, too lean and it will cause problems.



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Old November 3rd, 2004, 10:15 PM   #12 (permalink)
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Yeah I'm never going to have my dad get gas for me again though... I told him 1-1/2 gallons and its mixed perfectly already.

Well he added MORE Oil in it and only put 3/4 gallon it.

So I'm running roughly 20:1 when it should be 40:1 and I usually do 43:1.

Gah :-/
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Old November 4th, 2004, 09:02 AM   #13 (permalink)
 
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they make like some kinda boat fan that people put on their cars intakes for like 2 psi of boost. so if you can match that by adding more fuel the hp would jump greatly. good luck (electric s/c)
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Old November 4th, 2004, 03:31 PM   #14 (permalink)
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add a little O'donnel to your gas, hehe u r/c guys know what im suggesting..
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Old November 4th, 2004, 06:52 PM   #15 (permalink)
 
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Quote:
Originally Posted by countryaccent
they make like some kinda boat fan that people put on their cars intakes for like 2 psi of boost. so if you can match that by adding more fuel the hp would jump greatly. good luck (electric s/c)
those are boat bilge fans, and they still don't flow enough to do much for their advertised(vehicle) use, but they MIGHT might do something for a small engine like that, they are between 20-30 bux on ebay. i still vote for flame thrower and custom exaust if its electric start.

EDIT: didn't see your lil post about it not being electric start. i bet you could jerryrig somethin for less than 50 if you have any access to machine shop tools.
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Old November 4th, 2004, 07:39 PM   #16 (permalink)
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Quote:
Originally Posted by 1337PAINTBALLER
Yeah I'm never going to have my dad get gas for me again though... I told him 1-1/2 gallons and its mixed perfectly already.

Well he added MORE Oil in it and only put 3/4 gallon it.

So I'm running roughly 20:1 when it should be 40:1 and I usually do 43:1.

Gah :-/


Ah, common mistake. Oil-to-fuel ratios in two strokes and air-to-fuel ratios are different. Air to fuel is the amount of fuel that gets atomized into the air, oil to fuel is the ration of gas to oil when mixed (because two stroke engines use a mix). In order to change air to fuel you need an adjustable carb or you need to change carb jets.



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Old November 18th, 2004, 10:12 PM   #17 (permalink)
 
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Technically it isnt forced induction unless there is a compressor. Who ever says you cant F/I a two stroke is completely wrong, an engineering college around here has an aerocharged (really small turbos for motorcycles and stuff) polaris x-edge 600. That thing is fast as hell, they had it at the snow drags last year, i dont think they lost to much other then an custom alky arctic cat. Anway, your best bet would be to just open up the intake track as much as possible.
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Old November 19th, 2004, 12:40 AM   #18 (permalink)
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Here's an idea, get a bottle of whipcream, stand it right side up, put a hose from the nozzle to the air box, and hit the bottle of whipcream.

Instant Nitrous boost!
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Old November 19th, 2004, 12:47 AM   #19 (permalink)
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lol, wonder if that'd even work..
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Old November 19th, 2004, 10:27 PM   #20 (permalink)
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I was thinking about rigging a Remote Kit to my filter, run a nitro tank on my handle bars, twist knob for pressure into the carb. But it seems risky and too much of a pain.

But I'm really considering it on my pocket bike.
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Old November 20th, 2004, 06:29 PM   #21 (permalink)
 
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OOOO!!! the whiped cream gave me an idea!. one ebay they sell these "cheater nitrous kits" they consist of a hand operated puncture device to open up a canister(like a co2 canister) of nitrous. claims a 30hp gain for about 2 seconds in cars. they cost about 60 bux online. but u could buy a pack of the canisters for like 25 bux i think it is, and build your own. the puncture devices are the same thing as what is sold at bike shops for these quick inflate kits that use co2 canisters. u can find these things for like 20 bux or less. then buy a schreader valve(SP*: tire valve type thing) and some vacume line to run it to the intake, and mabye a nozzle of sorts.
on that small of an engine tho, i'd def. not just hammer the valve open, i'd kinda gradually let it off
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Old November 22nd, 2004, 03:20 PM   #22 (permalink)
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If anyone uses the whip cream idea, tell me how if it works so I could use it on my CR250
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Old December 7th, 2004, 12:47 AM   #23 (permalink)
 
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Ive put a NX sytem for a snowmobile on my moped. Lots of fun. Bleach burnouts. More fun
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Old December 19th, 2004, 07:13 PM   #24 (permalink)
 
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Do you guys mean putting the fan on top or under the air filter? Also will 1 gallon gas-1/2 gallon oil work for most or all 2 cycle engines?
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Old December 19th, 2004, 07:36 PM   #25 (permalink)
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Quote:
Originally Posted by Ahmadi6490
Also will 1 gallon gas-1/2 gallon oil work for most or all 2 cycle engines?
Yikes! That is way too much oil. Go buy a bottle of two stroke oil and mix to the specs on the bottle. Once you learn a bit more then you can start playing with ratios to get the most power.



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