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Old 09-13-2008, 07:22 PM
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Default Homemade supercharger

So by now, all you guys know that I'm constantly looking for awesome and insane ways (albeit complicated) to get every single speck of power out of my flathead, so look what I came up with:

First off, I took the flywheel off of my old go ped (It needs a new engine) and I thought to myself, "hmm, It looks like these little fins could generate some serious airflow." I took it and placed it in some 4" pvc pipe, and it fit perfectly, with just about .2 of an inch of clearance all around. My idea is to make a little container out of 4" pvc end caps, drill through the middle of the flywheel to make it uniformly 1/2" (it's tapered right now), drill holes exactly in the middle of the pvc, mount some high-speed bearings, then stick a 1/2" rod through it. On the outside I'll gear it for about 3:1 on the engine (3 being the engine, 1 being the charger), using a small chain or belt. Here's a diagram I made on paint:



Edit: ok, so the lil thing wouldn't upload, even though it was extremely simple and small. I guess I'll just have to describe it: I have the inlet tube on the bottom and the outlet (to engine) tube on top, both at the same horizontal position, but i'll have to cut a strange shaped hole on the top and bottom, and have to shape the ends of the inlet and exit pipes to fit the contour at a horizontal position, if you see what I'm saying (its really hard to explain). At the bottom, I have the inlet strategically placed to where the fins of the flywheel are cupped away from the inlet, to suck air in. At the top, the air is being blown into the exit tube (the fins are facing towards this one) after traveling 180* around the housing. Oh yeah, and the great thing is, I dont have to worry about the impeller (flywheel) exploding, because it came off a two stroke designed to turn 12,000 rpm (which is exactly the speed it will be spinning at if my engine is spinning 4000rpm )
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Old 09-13-2008, 07:27 PM
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Picture doesnt work?
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Old 09-13-2008, 07:51 PM
2or3wheels 2or3wheels is offline
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try uploading it to photo bucket and posting it directly on the reply.
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Old 09-13-2008, 07:55 PM
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I'll try
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Old 09-13-2008, 09:17 PM
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thats a good idea
you know, i have a little 2 stroke flywheel
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Old 09-14-2008, 09:25 AM
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ok, now it should work:

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Old 09-14-2008, 09:50 AM
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That may work. But 13 thousand RPM and pipe doesnt sounds good.
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Old 09-14-2008, 10:09 AM
Kenny_McCormic Kenny_McCormic is offline
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Air should come in from the senter, One of those little air mattress pumps would work good, just rip the motor out, add a pulley and hook it up. And IDK how well a flathead carb will take boost, hopefully the pulses from the intake valve opening and lcosing will be enough to run the fuel pump and draw fuel, you might need to pressurize the tank(T off your boost line and clamp a hose where the gas cap should go).

Last edited by Kenny_McCormic; 09-14-2008 at 02:03 PM.
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Old 09-14-2008, 01:58 PM
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Quote:
Originally Posted by jr dragster Tyler View Post
That may work. But 13 thousand RPM and pipe doesnt sounds good.

It won't be touching the pipe
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Old 09-14-2008, 02:47 PM
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some briggs use the flywheel to boost air into the carb

IMO a 2 stroke flywheel is heavier than a leaf blower impeller. you should dry one of those
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Old 09-14-2008, 02:51 PM
Kenny_McCormic Kenny_McCormic is offline
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Quote:
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leaf blower impeller
I dont think the poor little flathead could take it.
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Old 09-14-2008, 03:16 PM
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I personally dont think it would work at all...but who knows? Its always fun to mess around with this kinda stuff anyway.
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Old 09-14-2008, 04:08 PM
2or3wheels 2or3wheels is offline
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give it a try. then patton it and make mucho money
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Old 09-14-2008, 04:32 PM
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I know the flywheel wont touch the pipe. But how are you going to mount bearings in a plastic pipe?
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Old 09-14-2008, 07:35 PM
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drill a hole and stick the rod through so it's straight, then set them in place with epoxy or jb weld
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Old 09-14-2008, 07:44 PM
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Quote:
Originally Posted by Kenny_McCormic View Post
And IDK how well a flathead carb will take boost, hopefully the pulses from the intake valve opening and lcosing will be enough to run the fuel pump and draw fuel, you might need to pressurize the tank.
Im probably going to be using a 24mm mikuni, so the gas will have an external pump
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Old 09-14-2008, 08:15 PM
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Quote:
Originally Posted by I like karts View Post
drill a hole and stick the rod through so it's straight, then set them in place with epoxy or jb weld
if its going to be spinning 12000 rpm then it better have bearings and something better than epoxy
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Old 09-14-2008, 11:49 PM
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Quote:
Originally Posted by ed1380 View Post
if its going to be spinning 12000 rpm then it better have bearings and something better than epoxy
I surely do'nt want to be next to that if it disintegrates but it's a cool idea tho.
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Old 09-15-2008, 12:51 AM
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Kenny is right. Air MUST enter from the centre to get any sort of pressure at all.
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Old 09-15-2008, 09:45 AM
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Why not use a HF 6.5HP's little plastic fan instead?
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