i saw a centrifcal super charger on on ebay. it was for a mustang . it was a turbo charger that had the rear machined off and in place, a pulley the guy said it run 8 pounds(not likely). but I took that idea and i've changed it around alittle in stead of pulleys I used one pulley a shaft to put the force and charger to the battery side.the shaft is connected to a camgear (large) then connected to another (smaller)camgear on the charger.
i im moving the battery to the trunk so the charger can sit there.
i ran into a snag the machining i did is not perfect I can't get either gears to be true or stop wobbleing I dont want to stop the project i have alot of time and money invested.
what should i do ???
Real centrifugal superchargers are more than a pulley on a turbo, they have complicated gearboxes, you'll never get it to spin fast enough to make boost. Most turbo's spin at 100,000 RPM or more, same goes for superchargers. Even if you got a 2:1 off the belts, you could only get 12,000 RPM max.
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Well said Shifted.
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shifted i disagree with one of those statements most superchargers do not spin at 100krpm or more..... before i installed the rsm supercharger for the 2200 2.2 i spun the pulley once and counted the turbine spin 4 times.... 4:1 that is lets say best 24,000 rpm and the way it is it produces 8lbs of boost
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^ Yes, but Turbo's don't work like that, which is my point. A turbo needs 100,000 RPM's or more to make boost like that, superchargers are trimmed differently so they can make boost at such a low RPM, the money you'd spend on buying that kind of trim on a turbo you might as well buy a s/c made for the job.
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sinrocker wrote:shifted i disagree with one of those statements most superchargers do not spin at 100krpm or more..... before i installed the rsm supercharger for the 2200 2.2 i spun the pulley once and counted the turbine spin 4 times.... 4:1 that is lets say best 24,000 rpm and the way it is it produces 8lbs of boost
What is your pulley ratio? helps to figure that when calculating rpm based on engine speed. Your crank pulley is how much larger than your blower pulley?
most centrifical supercharger blades spin in the 40k to 60k range.
Most turbos can spin in the 60k to 100k range.
A turbo cannot be direct driven by a belt without some sort of major step up gearing. And no matter how fast a specifically designed supercharger may spin. a Turbo compressor wheel would still have to spin at its normal exhaust driven rpm to work.
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Yea i read a thing on Centrifugal superchargers before i got mine, around 60k seems to be what they spin at. Thus the whine a centrifugal makes, all of the gears spinnin that huge turbine up.
Thats the other diff, a turbo may only be 550cfm, the supercharger RSM gives you flows 800CFM, just a tiny bit bigger
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well kids there's the specs for the pulleys
on the serpentine I have a 2.5 inch pulley
on the shaft connected to the 2.5 is a 4.5ribbed pulley
and on the the charger is a 2.2inch ribbed pulley
can any one do the math ?
dude it wont work no matter what. You cant spin a TURBO fast enough off the belt to make boost. LIke everyone is saying, turbos and superchargers operate differently. You cant just slap a pulley on a turbo and expect boost.
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The Crank pulley must be larger then the driven pullies (the shaft, and turbo)
Crank Pulley size?
Input on shaft?
Output on shaft?
Input on Turbo?
if you have a 4" crank pulley, and a 2.5" shaft pulley, thats 1.6:1ratio
if you have a 2.5" shaft pulley and a 2.2" turbo pulley, thats a 1.1:1 ratio
Max RPM of engine = 6500 x 1.6 = 10,400 x 1.1 = 11,440....... thats the RPM of the "turbo" if you have a 4" crank pulley..... IDK what size the pulley is, but if you measure it, and plug that into the equation, you'll get the RPM.
Never going to be fast enough. You'd need a 15" crank pulley.
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francisco patino wrote:well kids there's the specs for the pulleys
on the serpentine I have a 2.5 inch pulley
on the shaft connected to the 2.5 is a 4.5ribbed pulley
and on the the charger is a 2.2inch ribbed pulley
can any one do the math ?
Let me try and see if I can translate this...
The crank pulley diameter is: ?????
it is driving a pulley thats: 2.5"
that pulley is connected to a Jack shaft that another pulley on the other end.
The diameter of the pulley on the other end of the shaft is: 4.5"
That pulley belt drives another pulley on the charger that is: 2.2"
Is this correct so far?
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man you are all over this one
thats exactly right i still have to measure the stock crank off my 2000 quad 4
but i have to jet to school
so i'll try to get it later
this is why supercharger kits are kits and turbo kits can be custom made... sorry for not contributing to this thread but someone seriously needs to read some FAQ's.
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