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Old 06-18-2002, 11:59 AM   #1
Tim Smith
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Default Centerfugal Blower?

I looked at a 650 CFM leaf blower today that would blow a car over if you weren't careful. It was $450 and I was thinking that the 3" pipe that comes from the housing would be perfect for pushing air into the motor. It had a progressive throttle so I could give it more gas at the same rate as the motor. It is even 4 cycle so that I could just tap into the fuel tank and not worry about gas. It only weighed 23 lb and that is with all the plastic housing backpack straps and all.

The only catch I can think of is that a centerfugal blower moves a lot of air but not at a high pressure. May be good to keep from blowing the motor.

Well, cram this under the hood with a couple of ducts to keep the heat down and when you need some power you rip a cord and of you go.

Will it work.
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Old 06-18-2002, 12:11 PM   #2
giulio
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yeah then you can add a rake attachment and make garden work FUN!

j/k

I guess it would work, but it'd be 'ghetto'. You'd have a crazy rig, what about oil, another engine to maintain, etc.
It's easier to make the engine turn a pulley which would spin the turbine and and... oh yeah... a supercharger =)
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Old 06-18-2002, 03:16 PM   #3
Tim Smith
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Yeah but it is a lot easier to write a check for $450 than it is to write a check for $1450 or more. Plus I could just unhook it when the fall leaves start to fall.

Ghetto, yeah it would be, but it would be cheap power. How many people would buy 10+ horses for $450? Just about all of us.
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Old 06-18-2002, 03:18 PM   #4
Tim Smith
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Forgot:

Plus it takes about 15 minutes to rebuild one of those little motors. It wouldn't get run all that much anyways. It would be warmed buy the engine bay heat so that rust and condensation would be a problem either.
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Old 06-19-2002, 07:13 AM   #5
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Tim

Well it could be hooked up, but good luck with finding the space!

More seriously, what extra power do you think you are going to get? The power from the motor on your leaf blower will only be at most 1 HP, and a lot of this will be lost. Save your $s and spend the money on removing your cats and/or adding NO2. If you want boost, why not get a WRX?

Duncan
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Old 06-19-2002, 08:48 AM   #6
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it's like a giant e-ram! those things were pimp! i still want one!
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Old 06-19-2002, 09:10 AM   #7
giulio
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Quote:
Originally posted by BugEyed
The power from the motor on your leaf blower will only be at most 1 HP, and a lot of this will be lost.
we're not ataching the leaf blower to the car's crank though. we're using it to push air. so the blower's hp isnt directly added. it's the energy in the air that is being added.

but how much air can 1hp compress?

650 cfm is a lot. the 2.5 does 230cfm at redline, 0psi boost. Just because the blower can push 650 cfm doesnt mean it can do 230 @ Xpsi ! I think it comes down to the torque of the blower's engine.
hahah you might be able to suck start the leaf blower using the engine's vacuum haha

lets see...
A supercharger on an rs has plenty of hp off the crank to push lots of air. definitely more than 1hp! But who knows how much is really needed to make 5 psi boost? I barely notice mine ("parasitic loss")... or maybe i've just gotten used to it? Some compare it to an A/C... but none of them have been in a s/c'ed rs. so maybe a little leaf blower IS enough to make a little gain!

ok im babling now...
tim you should try it and see what happens! since it's not going to be directly on/in the engine, it couldnt hurt. unless it comes loose and gets stuck in the belts! be careful.

g
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Old 06-19-2002, 01:19 PM   #8
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Actually, this is a 10 HP commercial leaf (rock, gravel, branch) blower. You really have to hold on to it. And it is 1200 CFM at the end of the housing. It is 650 CFM at the end of the nozzle. And none of those horses would be taken from the crankshaft. I think it has a 70cc engine that spins to 8K rpm.

This is not your grandma's 1/4 acre yard cleaner. This is a tennis ball launcher from H#!!.

The biggest problem would be the room under the hood. Maybe just put it in the trunk and route the intake tube through the car. Now we are getting ghetto.
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Old 06-19-2002, 04:25 PM   #9
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Talking eek

I'm scared.. if this did work we'd probably start seeing kids driving around town with "John Deere" stickers pasted to their civics.
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Old 06-19-2002, 04:47 PM   #10
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Well, from this redneck's point of view that would be a step in the right direction for them.
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Old 06-20-2002, 09:05 AM   #11
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Can you please list the brand and model number of the leaf-blower you have in mind? I'm the idiot who tried the e-ram. It was mostly a joke in my opinion.
How about a test run before you actually mounted it on your car, that way you could return it if it didn't perform as expected: Reduce the size of the end of the leaf-blower outlet by half, which should reduce the CFM to around 325. Tap a boost gauge into the duct will it is running at full throttle with the restrictor in place. This should give you a close estimate of how much boost you would have at wide-open-throttle near red-line (6250RPM).
My guess is less than 2PSI of boost.

Just a thought..
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Old 06-20-2002, 09:31 AM   #12
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Well the numbers are of pretty much the top of the line for each commercial company. Red-max, Echo, Haska, etc. If they are considered commercial, then they have one that is that big. Normally the part number is like a PB-6500 vs a PB250. Bigger is the big one, kinda a given.

On the PSI, I think you are right, a centerfugal with move a lot of air but no psi. (There is alot of places for air to just churn when there is back pressure.)

Oh well, I thought I would run it buy everyone anyways. Plus if you have leaves in the fall, this blower would make short work of them. They have attachments for painting and sandblasting also.

On the e-ram, did you try just carrying a spare battery just for it? Should be good for an hour non stop.
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Old 06-20-2002, 02:25 PM   #13
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That's just a silly idea.

I'm not sure if there's anything else I can say...
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Old 06-20-2002, 02:36 PM   #14
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this has been done before but not on this board. i forgot where and dont know the results, but someone has done this.
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Old 06-23-2002, 09:05 PM   #15
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Myfriend and I actually rigged up a system like this (don'st ask what car he drives, although you prolly can tell )

It didn't damage the engine, but we also couldn't tell if it helped. However the leaf blower was electric, so he just reved the car while I controlled the 'boost'

I'll say this: If you can get a reliable power boost from using a leaf blower, go for it.

MK
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Old 06-23-2002, 11:08 PM   #16
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Default Compressor

Why not try a small compressor attached to a large tank? Plenty of PSI but only for a short time till the tank refills. Or simply a small tank filled with compressed air. You can always refill your "turbocharger" for a 50cents at the 7 11. Here is another Idea. Anyone ever experimented with injecting small amounts of water staight into the engines cylinders. I heard the germans tried this in WW2 on some of their fighter aircraft. Kind of like cheap NO2. Don't think it would be very good for the engine though.
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Old 06-23-2002, 11:16 PM   #17
Mk750
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I still say the best injected power adder would be pure, medical grade O2, I mean, nothing would be better for improving combustion.

Granted it would be highly dangerous, but it would be fun

MK
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Old 06-24-2002, 09:22 AM   #18
subarumantoo
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I saw a video of a guy who hooked up liquid oxygen to his caburetor way back in the 1920's. As soon as he turned the valve, mushroom cloud. Killed him and a few other people near by...
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Old 06-24-2002, 09:38 AM   #19
Mk750
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Damn, that sucks. Like I said it would be very expensive and dangerous, but a properly tuned engine would need no turbo, sc, or outside air source if one could make an engine strong enough.

MK
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