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Redcbr007
April 23rd, 2004, 22:32
http://www.azod.com/azoffroad/Archive/2001/The%20Poor%20Boy%20Air%20Compressor.htm

does something like this exist? there's no way it could be consistant air...

-Red?

bzdel2441
April 23rd, 2004, 22:45
It might work but it would send a crap load of gas through your exhaust. II wouldnt do it. Its like what you do to make fire come out your exhaust.

Mingez
April 23rd, 2004, 22:51
doesn't seem healthy.

Weasel
April 23rd, 2004, 22:52
Yeah it does work, I don't remember what use the same type of thing. Large equipment trucks maybe? You also have to unhook the injector or gas line to the cylinder though. And no you won't pump more gas through your exhaust, your just running the engine on one less cylinder.

Not sure if their exact method is correct though.

5-90
April 23rd, 2004, 23:43
It's doable - I've seen industrial setups built on small block Fords and Chevvies where they run on one bank and use the other for an air compressor, and use the power output to run a dynamo or a shop pump...

Would I do it with a driving engine? Only if I REALLY had to - I'd sooner use a little two-lunger for a dedicated compressor if I could.

5-90

Goatman
April 24th, 2004, 00:35
That's a very old trick, and was used way before all the 12V compact air compressors came to the market. We had one of these set ups that we used on our old CJ when I was in high school (mid 60's), and used it to fill up the Jeep tires and our dune buggy tires. The parts for it were offered for sale back then, we didn't have to make our own.

Eagle
April 24th, 2004, 02:30
That's a very old trick, and was used way before all the 12V compact air compressors came to the market. We had one of these set ups that we used on our old CJ when I was in high school (mid 60's), and used it to fill up the Jeep tires and our dune buggy tires. The parts for it were offered for sale back then, we didn't have to make our own.

Yeah, JC Whitney used to sell the kit. And that was back in carburetor days, so every cylinder got the same fuel/air mix -- you didn't have the option of disconnecting one injector so you pumped only air.

chucknewell
April 24th, 2004, 05:35
Commonly called a Chuffer Pump. JC Whitney has them listed as Air Pump and Tire Repair Kit. http://www.jcwhitney.com/webapp/wcs/stores/servlet/ProductDisplay?productId=3034&catalogId=10101&langId=-1&storeId=10101
I had one years ago, worked OK but I'd rather have a compressor.
Chuck

RichP
April 24th, 2004, 06:36
I have one sitting right here in a zipper bag with 12ft of hose and tire/tube repair parts. I use it on the motorcycles, pull a plug screw in the sparkplug sized compressor and fire up the engines other 3 cylinders. Works pretty good but there is even with that little mini-cylinder compressor sitting outside the engine some 'fuel vapor' seepage into the compressor, it's not a good idea to smoke around the tire valve when you get the tire repaired permanently at a shop. I used it quite a bit when I took my bike up to hudsons bay from boston one year and out to nova scotia and newfoundland on a 3 week camping touring vacation back in 81 or 82.

ChuckD
April 24th, 2004, 07:02
Hey can you run and ARB off that! :D:D:D:D

Redcbr007
April 24th, 2004, 08:28
does it acually produce enough CFM for tooling/etc..anyone have any rough Ideas on some numbers?

Thanks

-Red

Neil
April 24th, 2004, 08:32
Hey can you run and ARB off that! :D:D:D:D

Chuck, I'll get you one of those blood pressure cuff hand pump things so you can run your ARB. :gee:

seanR
April 24th, 2004, 09:27
I have a question. What keeps the air from running back into the cyl. on the ignition stroke? I can see how it would 'blow' air during the compression stroke. But with both valves closed and the piston traveling downward, what keeps air from going backwards, is there some sort of reed valve instaled that I missed?

Redcbr007
April 24th, 2004, 13:30
I was wondering the same thing about it sucking back in....

8Mud
April 24th, 2004, 13:46
Have to be a ball check or something like it, sort of like a compression tester. A little off subject, but relavent, is spraying some ether into a tire off the bead and lighting a match, will often pop it back on the bead. Also remove facial hair and leg hair.

seanR
April 25th, 2004, 08:06
A little off subject, but relavent, is spraying some ether into a tire off the bead and lighting a match, will often pop it back on the bead. Also remove facial hair and leg hair. and possibly Testicles!


That used to be a very common practice for field mechanics years ago. That procedure has been banned by OSHA, MSHA, and just about every other alphabet soup orginization out there. It is very dangerous!

vintagespeed
April 25th, 2004, 09:52
I have a question. What keeps the air from running back into the cyl. on the ignition stroke? I can see how it would 'blow' air during the compression stroke. But with both valves closed and the piston traveling downward, what keeps air from going backwards, is there some sort of reed valve instaled that I missed?

Assuming you're just filling tires then the Schrader valve will prevent air from flowing back into the port.

8Mud
April 25th, 2004, 12:01
Think real hard before you do this, unless the fuel is cut off, you are pumping 12-14 to 1 air-fuel mix into an enclosed area. Reason I mentioned, the old timers method, of exploding a bead back onto a rim. Any kind of spark (static electricity) could set it off. :nono: