blower question

Shopteach · 03-28-2003, 04:20 PM

I need some information from the supercharger experts. In one of my shop classes we're building a hotrod minibike. We are starting with a 5 horse Briggs and Stratton engine and using an air injection (smog) pump for a blower. My question is, what is a simple way to measure the amount of boost the pump delivers. How does a boost gauge measure the increased pressure. I don't think a simple air pressure gauge will work for this purpose. Am I wrong?

Hethj7 · 03-29-2003, 09:43 PM

I would think a simple air pressure gauge would work fine for this. They work by measuring a pressure difference (i.e. the pressure difference of the outside atmosphere compared to the charged air inside).

One concern I would have is what kind of pressure increase you are expecting to see with a smop pump. I wouldn't think a smog pump would provide enough pressure to really help out anything, but I am not sure. Maybe someone else can chime in on this issue.....

HotRoddin · 03-29-2003, 10:13 PM

I think it sounds facinating! I'd like to hear how it comes out.
I don't know how what CFM a smog pump puts out, but remember a little one cylinder engine isn't gonna require anywhere near what V6 or V8 does.
As for the boost guage, i'd say just a very low pressure air guage. You'll probably be working with very low pressures so obviously you aren't gonna be able to read 5 or 10 PSI if you have a 2000 PSI guage, so just get a guage with a very low full scale reading, like 0 to 25 PSI or so. Let us know how it turns out

03-28-2003, 04:20 PM	#1
Shopteach Registered Member Join Date: Jan 2002 Location: Berryton, KS Posts: 13	blower question I need some information from the supercharger experts. In one of my shop classes we're building a hotrod minibike. We are starting with a 5 horse Briggs and Stratton engine and using an air injection (smog) pump for a blower. My question is, what is a simple way to measure the amount of boost the pump delivers. How does a boost gauge measure the increased pressure. I don't think a simple air pressure gauge will work for this purpose. Am I wrong?

03-29-2003, 09:43 PM	#2
Hethj7 Mizzou Tigers Join Date: Apr 1999 Location: weston, MO United States Posts: 1,455	I would think a simple air pressure gauge would work fine for this. They work by measuring a pressure difference (i.e. the pressure difference of the outside atmosphere compared to the charged air inside). One concern I would have is what kind of pressure increase you are expecting to see with a smop pump. I wouldn't think a smog pump would provide enough pressure to really help out anything, but I am not sure. Maybe someone else can chime in on this issue..... __________________ 2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244

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03-29-2003, 10:13 PM	#3
HotRoddin cranky old man Join Date: Sep 2001 Location: Longview Texas Posts: 683	I think it sounds facinating! I'd like to hear how it comes out. I don't know how what CFM a smog pump puts out, but remember a little one cylinder engine isn't gonna require anywhere near what V6 or V8 does. As for the boost guage, i'd say just a very low pressure air guage. You'll probably be working with very low pressures so obviously you aren't gonna be able to read 5 or 10 PSI if you have a 2000 PSI guage, so just get a guage with a very low full scale reading, like 0 to 25 PSI or so. Let us know how it turns out