Thread: Home Made Blower?

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I'm not an engineer, but was thinking if it was possible to make a blower cheaply by using a bonner that would sit on top of your carb with a small inpeller mounted on a shaft that would be wired directly to your engine so the impeller would spin faster as your RPM's went up. In reality all a blower is really a air machine thats sucks in more air for better cumbustion. Would something like this work for small HP gains?

No sucking allowed! Only blowing...

Yes any blower *could work* as long as it can keep the air pressure(blowing) high enough at any air consumption rate of the engine. 700cuft/minute is NOT a trivial amout of work,(horsepower).

Originally posted by chevy 37
I'm not an engineer, but was thinking if it was possible to make a blower cheaply by using a bonner that would sit on top of your carb with a small inpeller mounted on a shaft that would be wired directly to your engine so the impeller would spin faster as your RPM's went up. In reality all a blower is really a air machine thats sucks in more air for better cumbustion. Would something like this work for small HP gains?

you are right chey 37, but i think its a little more to it than that. i'd thank you would need at least 3 lb. of boost to make a dif. and it(the air) would have to be almost 100% contained. i dont know for sure but i think the reason everybody dont do it is because a elec. fan strong and big enough to blow 3 lbs. of boost, wouldnt fit under the hood. JMO

Mike That makes all the sense in the world, but I'm talking about small power gains of maybe 20-25HP. Would I need that much boost for smaller gains? The inpeller or small fan I'm thinking about would be no more than 4" in diamater but would spin at whatever your engine RPM's would.

Chevy, check out this link to a paper I wrote on another forum. Look specifically at the E-ram and Super E-ram.

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http://streetmachinesoftablerock.com...topic.php?t=81

Now if I had taken the time to read that before I posted, I wouldn't have made such an idiot post. Heck here I was thinking I could make a small blower for nothing and provide a little more HP. Thanks for the info.

Chevy, when I was a teenager, I had a go-kart with twin McCulloch 2-strokes on it. Now, blowers of any kind have been the apple of my eye since day-one out of all the other go-faster goodies available to us nut-cases. (You can see that reflected in the research time given to the above link, a labor of love). So, I'm thinkin', how can I blow these 2-strokes? Well, the most obvious source for makin' one up when you're a teen and down on bucks is the impeller from a vacuum cleaner. Now, I sold the kart before I could bring the project to fruition, but like you, I was thinkin' about how to do it. I still think a 2-stroke that sucks mixture into the crankcase and uses the piston to pressurize it into the transfer ports could benefit from a modest increase over atmospheric pressure to stuff the crankcase. It wouldn't work to eliminate the transfer ports and stuff the mixture directly into the chamber, because it would simply be blown out the other side at the exhaust port.

Richard Just for the heck of it I'm going to try and build something. Can't hurt!

Go for it!!!!

Dayton makes blower fans, small medium and large, they operate with the barral fins. Seems like you take the motor off, mount a pully outboard of the carb, stick it ontop the carb, and it would force air. We use small 1's at hunter for boot rack dryers, there rated for 100 CFM but, they sell blowers up to 2000 CFM, which any could be increased as, most all of them operate at or around 2850 RPM which by increasing the RPM, you increase the CFM.

Matt Just what I was thinking except I have a box of 150CFM fans which I'll probably use. Thanks for the input.

go for it chev. 37, but i wont to go on record saying that there is not a 12 volt motor in this country that is small enough to go under the hood and will pump enough air into a 350 sbc., that will make any noticeable dif. in HP. prove me wrong and ill buy you a beer.

This whole concept is great.
Way back when, I read an article for a turbocharger for model airplanes, complete with schematic for a for the dimensions compatible to a Fox 40. Ok, armed with absolutely no experience whatsoever, and an high school machine shop and teacher, I scaled it up to fit a Mcullough chain saw.
To this day I still design it in my mind. The why, what I missed, what I was trying to do, especially, what was I trying to accomplish.
To this day, I still know little about blowers except the one I had was with fuel injection.
I do wish you the best of luck. I really hope it works, and, I am now thinking of flow rates, boost volume,.... I love it.
This is one of the best forums I have ever seen. The diversity and information keeps me in a subject of prime interest.
I hope someday, it works.

Ohhh kay... This is something I have always wanted for my diesel sub but I have never gone very far because of the hurtles.

I'm an engineer so when this comes up I must trot out my books and enlighten the experimenters.

If we are talking a chevy 350. And we are talking 3/4 throttle. We are talking... oh, say, 500cuft/min of air.

If we want to boost this a measily 5 PSI.
And if our fan/blower system has a remarkable efficiency of 85 percent (very good). Then 12.77 HP is required.

This is hard to get out of 12VDC land.

100 cuft/min => 2.55 HP
200 cuft/min => 5.11 HP
300 cuft/min => 7.66 HP
400 cuft/min => 10.22 HP
500 cuft/min => 12.77 HP
600 cuft/min => 15.33 HP
700 cuft/min => 17.88 HP

If we want some serious boost 10 PSI
500 cuft/min => 35.89HP

Top fuel dragster.. 3000cuft/min
30PSI => 460.89 HP

kcress, in his opening posts about this, Chevy said he was looking to make something like an additional 20 to 25 hp. I'm no engineer and will of course yield to your computations, but I don't think he's thinking 5 psi. That much boost might add something over 100 hp pretty easily. I've been told somewhere along the way that it takes 1.6 cfm to make 1 hp, so do you think it's possible for an electrically-driven fan to produce the additional 32 cfm required to support an addditional 20 hp?