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Topic Review (Newest First)
12-30-2007 09:27 AM
ZAPPER68 I used to work with a guy that had a V12 Jag engine that he used as a compressor. Actually one bank was the compressor and the other was the engine. He said it worked a treat, pumped a ton of air and was an excellent conversation piece when the boys came over for beers.

ZAPPER
12-28-2007 07:52 PM
dan69
diy air compressor

my friend has a volkswagor air compressormade in germany by vw,it will max out then shut off,but when the air pressure drops it will crank the engine and start with the use of relays no computer involved.it is a regular vw 4 cyl. 2 run 2 compress.he got it for free.like new an came with the book.
12-22-2007 09:16 AM
OneMoreTime I have one of the twin cylinder harbor freight pumps and one of their compressor motors which I mounted on a airtank from a used Sears compressor..about a 30 gallon tank..My generator will run it if I need to take it to the field and it has done all that I need to do..

cost about $300 to build

Sam
12-21-2007 07:11 PM
matt167
Quote:
Originally Posted by oldred
Two tanks that size should work quite well for the size compressor you are talking about but why do you want a gas engine? If the reason is for mobile use then I would suggest just using one of those tanks but if it is to be stationary then you can use both but you would then be much better off with an electric motor, much simpler to set up and a heck of a lot cheaper to operate.
no 220V and it would be hard to run it.. possible but the lawn would have to be dug up,and being in town theres codes ect.... I'm pretty sure we have a 60 amp 220 service in the house we could tap off of. only 220v appliance is the stove.. I guess 220v electric is possible
12-21-2007 06:31 PM
oldred Two tanks that size should work quite well for the size compressor you are talking about but why do you want a gas engine? If the reason is for mobile use then I would suggest just using one of those tanks but if it is to be stationary then you can use both but you would then be much better off with an electric motor, much simpler to set up and a heck of a lot cheaper to operate.
12-21-2007 06:25 PM
matt167
Quote:
Originally Posted by oldred
2 100 gal or 100 lb tanks? 200 gal, if it is 100 gal tanks, would still be way to big and about 60-80 gal is all you would really want with a 12 to 20 CFM compressor and with less than 12 CFM you would want a 60 gal or less. If you are talking about the standard upright tanks commonly used with residential LP service they are probably 100 lb with about 35 to 40 gal capacity each.
yes 100 pound.. wrote 1 thing, thinking another lol..
12-21-2007 07:38 AM
mike's hotrods yeah, your right about all of that. that compressor was very noisy, it was hard to talk to someone next to you if it was running, you pretty much had to yell. if you made that for a shop it would more or less be a noveltie peice to show off, but it definantly was not a rare thing, we had it for concrete breaker use only or to hook up to a 1'' impact to break a seriously stuck big bolt. the gas that thing burned up, I bet that thing has consumed lots of gas in its lifetime
12-21-2007 06:30 AM
oldred
Quote:
Originally Posted by mike's hotrods
that would be cool, look up v8 chainsaw on youtube. I work as a mechanic, and we use to have a grimmer schmitt compressor at work, which was a ford 302, one side of the engine was an engine and the other four cylinders was the compressor. 125 cfm no air tank. the air side had a head with a series of one way valves which would be opened or closed as air was being used, kinda hard to explain, it was hard to understand till I had to fix it, I always swore it would have worked better if they used a chevy. but it actaully worked pretty good. I bet it still works for the guy we sold it to.

That's the same as the one I mentioned except it is based on a Ford instead of a Buick engine. There is nothing unusual about these things and they were (still are on some jobs) common for service truck use at the mines, one place I know has 4 of the dang things. The VW conversion was used quite a bit years ago but I think they are kind of scarce these days although they would be more practical than the big V6 or V8 conversions unless someone has a need for a couple hundred CFM, such as a large sandblaster or jackhammer. Trust me these things are not for shop use and are good only for an industrial application because of noise and operating costs. I worked with (and listened to ) the things for years and it is almost unbelievable how much fuel they can use so unless you have a serious need for that much air they are simply not worth the horrendous operating cost.
12-20-2007 11:43 PM
mike's hotrods
Quote:
Originally Posted by BossChevy62
It is possible to build a monster air compressor, I am actually in the process of building one out of a 350 chevy V-8. I will post pictures and the process when it is finished, but it will be about as monsterous as they come. It will put out over 200cfm at 120 psi. If you are interested in something that big, or maybe something a little milder, I would definitely help you out with the design, if you are interested.

-David

that would be cool, look up v8 chainsaw on youtube. I work as a mechanic, and we use to have a grimmer schmitt compressor at work, which was a ford 302, one side of the engine was an engine and the other four cylinders was the compressor. 125 cfm no air tank. the air side had a head with a series of one way valves which would be opened or closed as air was being used, kinda hard to explain, it was hard to understand till I had to fix it, I always swore it would have worked better if they used a chevy. but it actaully worked pretty good. I bet it still works for the guy we sold it to.
12-20-2007 11:03 PM
projectjohn Ok What about VW engines? I know that CP Rail at one time used these as air compressors I think that they were 4 cylinders 2 for air and 2 for running and to top it all off they are air cooled so no messy antifreeze. And probably lighter than a V8. Its a though because I was told that they would put out serious air also.

Kinda on a different note. Has any one else ever seen the spark plug air compressor? My Grandfather had one and you would pull a plug and put this hose in and fill tires with it. Cool idea i think.

Edit: Did a quick little looking around and found Dunn-Right conversions. And they are saying 58 CFM at 100 psi. Might be a touch on the large side but if you need air that would do it.

Dunn-right Site
John
12-20-2007 09:09 PM
oldred 2 100 gal or 100 lb tanks? 200 gal, if it is 100 gal tanks, would still be way to big and about 60-80 gal is all you would really want with a 12 to 20 CFM compressor and with less than 12 CFM you would want a 60 gal or less. If you are talking about the standard upright tanks commonly used with residential LP service they are probably 100 lb with about 35 to 40 gal capacity each.
12-20-2007 07:15 PM
matt167 I was thinking about getting a 13 HP Harbor freight engine and running 1 of the Harbor freight twin cylinder pumps into 2 100 gallon LP tanks that we have around... bought the house on forclosure and the gas company we got would not take them, so we used up the gas they had in them and well.. the garage needs a compressor
12-19-2007 10:13 PM
oldred Koolaid, Those Buick engines had a special head designed just for that purpose along with a cam that changed the firing order so they were not really a simple conversion. The things ran a governer coupled to a throttle kick-down that idled the engine when the tank was full along with an unloader that took the load off when the engine was at idle mode. As I said they made some serious air but they used some VERY $eriou$ fuel too! They are a good set-up for a service truck or for other mobile use that needs a lot of CFM but would not be practical for a garage or shop due to the noise and enormous operating costs.


Badmerc, A 6 HP gas engine would not be enough power to operate a pump big enough to do much more than about 10-12 CFM and it can be quite complicated getting it set-up to operate right. In order to get any real efficiency you need that idle kick-down and unloader to take the load off the engine and to keep the pump from compressing more air when the tank is full. I have seen several set-ups that simply dumped the excess air when the tank reaches pressure but that is very wasteful of fuel which at todays cost makes these things terribly expensive to operate anyway, and that does not even address the problem of excess wear from running the engine under a load all the time.
12-19-2007 06:28 PM
79C10 A bit different than what you're talking about here , but I had a 84 mazda b2000 pickup with a built in air compressor. The guy I bought it from had modified it as follows :
He ran the smog pump output to a tank mounted under the bed and had the air hose connectors inside the gas tank door! It was a really neat setup to say the least. as long as the engine was running , it would work like a charm . with a tank full ( engine off ) you could fill 4 tires on a car , no problem. I'd guesstimate the tank was about 35 gallons or so. While I only used it a few times , it came in really handy when I needed it.
12-19-2007 05:59 PM
onebadmerc So if the washing machine or dryer motor is too small then would a 6 hp Honda vertical engine with a much smaller tank be more efficient? Would building a air compressor be cost effective or is it going to cost more if you have to buy a new tank, pump and motor? Right now I have a 5hp DevilBiss air compressor I bought about 11 year, it works fine but I need more power. I will either need to buy a bigger one or build one, or could I get another 5hp compressor and piggy back two compressors together?????
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