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Old 07-19-2007, 06:58 PM   post #16 of 54
LilysDad
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Default Re: Smog Pump Supercharger

This is getting beyond me. Could you explain the draw through system?
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Old 07-19-2007, 07:11 PM   post #17 of 54
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Default Re: Smog Pump Supercharger

Quote:
Originally Posted by Lily'sDad View Post
This is getting beyond me. Could you explain the draw through system?
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Old 07-19-2007, 07:13 PM   post #18 of 54
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Default Re: Smog Pump Supercharger

A draw through system has the carb before the blower. The blower sucks the fuel/air mixture through the blower, and forses it into the motor. So insted of Blowing through the carb, ir sucks through it.
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Old 07-19-2007, 07:46 PM   post #19 of 54
LilysDad
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Default Re: Smog Pump Supercharger

Thanks for the explaination!
I found a small turbo on e-bay. #140139699217
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Old 07-19-2007, 10:16 PM   post #20 of 54
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Default Re: Smog Pump Supercharger

I'm gonna use a smog pump with an intake port... not on e with the holes behind the fin...

It's all for fun.. so what the heck.. I'll give it a try... if it blows up I'll have an excuse to put in a 10 or 12 hp motor...

I'm gonna use the #26 carb.. that is a 10-12 horsepower carb... should be jetted pretty good for this...
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Old 07-19-2007, 10:53 PM   post #21 of 54
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Default Re: Smog Pump Supercharger

Ok. Now I understand. So I take it the force through is the blower before the carb forcing more air in then justa ir and fuel....
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1993 F150 Used to be Flareside
135000 Miles
4x4
5.8l 351w V8 thats burning oil and leaking a quart a day
E4OD automatic
Primer Gray (Soon to be Foxfire Metallic)
Short bed
Standard Cab
Rebuilt after being rolled over on 11-18-08

1993 Crown Victoria
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4.6l 281 V8 that runs like a top
Green
Black Steel Wheels 15"
Home made "Cherry Bomb" exhaust
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Old 07-20-2007, 05:45 AM   post #22 of 54
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Default Re: Smog Pump Supercharger

Hear you go guys. Read up!

http://auto.howstuffworks.com/supercharger.htm
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Old 07-20-2007, 07:55 AM   post #23 of 54
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Default Re: Smog Pump Supercharger

Paul,

Great link thanks...
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Old 07-20-2007, 07:57 AM   post #24 of 54
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Default Re: Smog Pump Supercharger

Since hearing you talk about this, I went on line and there are a number of people who have actually made this work on a small engine. Also they claim that an ac pump puts out even more. One thing about the draw thru design, you are compressing fuel vapors. That might not be good.
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Old 07-20-2007, 02:41 PM   post #25 of 54
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Default Re: Smog Pump Supercharger

Um, you're compressing fuel vapors either way. With the blow through, you're just trying vaporize and mix the fuel and air in an already compressed environment. If nothing else, that means you have to have extra fuel pressure to drive the fuel into the carb. If that pressure was lost, there would be pressure blowing back through the gas tank. Not exactly the hot set up either. Or maybe it would be very hot blowing gas all over the place! LOL

Pros and cons to both ways. But the draw through seems much simpler to me.

Dale, in Michigan
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Old 07-20-2007, 05:24 PM   post #26 of 54
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Default Re: Smog Pump Supercharger

I am internet limited for a while, so I'll add my 2 cents to the forum occasionally:
I just took a smog pump apart to "Modify" the vanes and grease the brgs.. If you do a draw thru (like my turbo dunebuggy) you will de-grease the internal bearings of your pump, after a bit, with the gas.
A blow -thru requires you to keep fuel pressure ahead of boost at all times and jetting is more difficult because of density changes w/ boost. First see if the pump will make any boost. A couple of pounds is not worth bothering with- you will only be gaining the power to drive the pump. 6-8# would be worthwhile.
A turbo would be good also, since you would be loading it real good pulling the sled. Turbos work on load / flow. But finding a turbo that tiny might be impossible and sizing it just as difficult.

Mike
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Old 07-20-2007, 06:58 PM   post #27 of 54
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Default Re: Smog Pump Supercharger

I have seen a tubro charged 14 hp Kohler on a Wheel Horse, the set up was a lot of work but ..... the guy told me he could pull the front wheels off the ground just by stepping down on the throttle!
Bill in Richmond, Va.
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Old 07-21-2007, 05:51 PM   post #28 of 54
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Default Re: Smog Pump Supercharger

I've seen a turbo on a 16HP Kohler K-series (or maybe a Magnum. It was a single anyway). Don't know what the turbo came off of, but I can tell you he made some VERY SERIOUS horsepower!!!!
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Old 07-21-2007, 05:58 PM   post #29 of 54
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Default Re: Smog Pump Supercharger

Small turbo... hundreds of dollars...
Smog Pump... $10 at the junk yard...

This has to stay low budget.. she's already pi$$ed that I spent so much on the restoration...

If I had the bucks.. I would go turbo.. exhaust gas is free... it takes power to turn the smog pump....

But I just want to see for myself how well this will work...

Do you think the stock fuel pump will produce enough pressure to keep up in a blow through?
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Old 07-22-2007, 12:33 PM   post #30 of 54
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Default Re: Smog Pump Supercharger

Another question on a blow through would be, will the stock float/needle STOP a fuel pump that makes enough pressure at full boost, when the boost is not there.

If the stock fuel pump pressure is enough, then the answer is simple. But somehow I have a hunch you'll need more pressure than that.

Dale
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