blower motor
Mountain Pass
Joined: Sep 2010
Posts: 184
Likes: 0
From: Oconomowoc, WI
CFM
Fred,
A CFM is literally a Cubic Foot Per Minuite. Look at the Grainger website they have all kinds of fans rated and you may be able to approximate the volume curve for your blower on that site. Otherwise check with the manufacturer of your blower fan and motor combination. The squirrel cage fan is a positive displacement device. The current drawn by the motor is controlled by the inlet not the outlet of the fan. If you need to regulate the amount of amperage drawn by the fan restrict the inlet a slight amount. If it is a blade type fan then NEVERMIND!
A CFM is literally a Cubic Foot Per Minuite. Look at the Grainger website they have all kinds of fans rated and you may be able to approximate the volume curve for your blower on that site. Otherwise check with the manufacturer of your blower fan and motor combination. The squirrel cage fan is a positive displacement device. The current drawn by the motor is controlled by the inlet not the outlet of the fan. If you need to regulate the amount of amperage drawn by the fan restrict the inlet a slight amount. If it is a blade type fan then NEVERMIND!
Last edited by Marty Smilt; Dec 16, 2010 at 10:34 PM. Reason: fat fingers
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Posting Guru
Joined: Mar 2010
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From: WEWAHITCHKA FL.
FAN
These are 2x2x1/2 thick blower fans.I am building a mini 51 hood for my breather. It will be 14 inchs wide in the back and have a 10 inch filter 3 inchs high. I should have room to mount 2 of these on the back of the unit blowing air right into the breather.What yall think ? WILL IT WORK ?
Cargo Master
Joined: Jun 2001
Posts: 2,571
Likes: 22
From: Oxford, Indiana
Not at all. That's less than a V-8 will pull at idle. Your average 4 barrel carb is in the range of 500-750 CFM at wide open throttle. Some are more and some are less, but that's the average for a street carb.
Mountain Pass
Joined: Sep 2010
Posts: 184
Likes: 0
From: Oconomowoc, WI
CFM at what pressure?
Fred,
What is your Idea? If you want to enhance performance off the line or all through the power band you need to calculate the volume needed by the engine at any given RPM. Easy to do if you consider the engine is only using half the cubes per revolution. You gotta convert the cubic inches to cubic feet. etc etc. if you want enhanced performance put a couple of turbos on it. That takes a change in compression ratio (lower) and added clearance at the top of the pistons (heat expansion). I played with turbos on a corvair in a VW back about 40 years ago. 275 HP on the rear wheels of a VW bug was a LOT of fun till the cops started watching me.
Marty
What is your Idea? If you want to enhance performance off the line or all through the power band you need to calculate the volume needed by the engine at any given RPM. Easy to do if you consider the engine is only using half the cubes per revolution. You gotta convert the cubic inches to cubic feet. etc etc. if you want enhanced performance put a couple of turbos on it. That takes a change in compression ratio (lower) and added clearance at the top of the pistons (heat expansion). I played with turbos on a corvair in a VW back about 40 years ago. 275 HP on the rear wheels of a VW bug was a LOT of fun till the cops started watching me.
Marty
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Posting Guru
Joined: Mar 2010
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From: WEWAHITCHKA FL.
BLOWER FANS
All i'm trying to do is increase the amount of air going to the breather. Maybe alittle better mpg. A 51 hood has 3 holes on the sides and 3 across the front. So it can suck all the air it needs. I was thinking with 2 of these squirrell shaped blower fans mounted on it IT would receive a better air flow. CAN'T HURT.
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Brett Foote
Fleet Mechanic
Joined: Apr 2008
Posts: 1,373
Likes: 6
From: Moore (or less), OK.
Theoretically, if you are not exceeding the volume pulled by the carb you will be restricting the amount of air it will draw because the motor will have to pull air through the fans instead of the fans pushing air in to the motor.
In other words, yes, it will hurt. Nice try though.
In other words, yes, it will hurt. Nice try though.
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Posting Guru
Joined: Mar 2010
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From: WEWAHITCHKA FL.
BLOWERS
These small units will be mounted on the outside of the breather on the back. Blowing air in the beather and with the opening in the front and sides I can't see were it would rob air from the carb. All it would do is force air in so the carb can eat it. I understand this ain't alot of air but its more then it would have . MORE AIR BETTER IT RUNS RIGHT
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From: WEWAHITCHKA FL.
51 HOOD BREATHER
Think about it guys a breather that looks just like a 51 hood NOW THATS COOL.[so i think] What i was thinking is with the filter closed in [all but the holes in the front and side] it needed some forced air from the back. I know its not a turbo charger or a blower but ITS got to help put some air under the hood.Breather hood that is. Looked it back up and got 2 of these units that have 45 cfm each at 2800 rpm.
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Posting Guru
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From: WEWAHITCHKA FL.
Now that i can understand !! going with 45cfm that high as i can get with the size i need to fit. How many ballons is that ? LOL
Fleet Owner
Joined: Jul 2004
Posts: 27,299
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From: NM
If this is an "electric supercharger" setup, it's a waste of time. To feed the little 2.5L 4-banger in my 944, it has been calculated it would take a 40 HP electric motor to give noticeable benefit. There are lots of scammers trying to sell "electric superchargers", tight alongside the "turbulators" and exhaust spinners, it is totally BS. Even JCWhitney isn't carrying them.