Re: [papercreters] Re: Stucco blaster/ Air Compressor

Yeah, that's pretty much plan A, not as efficient as using the manifolds but a lot easier to do. I have a friend who is a good mechanic, vs. me under a shade tree, and I'll definitely get with him before I start turning bolts. The engine I plan to convert has a timing chain on sprockets but no, changing sprockets would not do it right. Maybe a new head made from plate steel with separate check valves for in and out, with the out to a manifold. Probably would need some cooling fins too, but maybe the water jacket would take care of it. Plus I could use my heat storage tank for my hydronic floor to cool the compressor if I'm using it at home.

I sure wish I could get my hands on one of those newfangled Mustang modular engines with electronic valve timing, among other nice tricks. But then that would cost a lot more than just buying a large compressor : (

Spaceman


Janoahsh wrote:

Sorry about that,

The last idea about changing the gears won’t work..

I think I get it though.  If you disable the valves, you can harvest air from the spark plug holes every time the piston comes up by using double check valves.

 

---

From: papercreters@yahoogroups.com [mailto:papercreters@yahoogroups.com] On Behalf Of Janoahsh
Sent: Thursday, May 21, 2009 1:54 PM
To: papercreters@yahoogroups.com
Subject: RE: [papercreters] Re: Stucco blaster/ Air Compressor

 

Here’s an idea,

Change the timing gears so the cam revolves once every time the crankshaft revolves once.

 

---

From: papercreters@yahoogroups.com [mailto:papercreters@yahoogroups.com] On Behalf Of Spaceman
Sent: Thursday, May 21, 2009 11:27 AM
To: papercreters@yahoogroups.com
Subject: Re: [papercreters] Re: Stucco blaster/ Air Compressor

 

A machine shop, but that's not the plan. The spark plug hole is available, so the existing valves will be disabled to stay closed all the time. Then new valves will be attached at the spark plug holes. An alternative method would be to replace the head with a custom head.

This is all in the planning stage, so I don't have any details for you...

Spaceman

Janoahsh wrote:

Hey spaceman,

How do you modify the cam?

 

---

From: papercreters@yahoogroups.com [mailto:papercreters@yahoogroups.com] On Behalf Of Spaceman
Sent: Wednesday, May 20, 2009 6:04 PM
To: papercreters@yahoogroups.com
Subject: Re: [papercreters] Re: Stucco blaster/ Air Compressor

 

It's about 90% there before you even start, mostly a matter of changing the valves so you get air intake every time the pistons go down, and compressed air out on each up stroke. The cylinders and pistons, and crankshaft are already fine, and there is even an oil pump built in to keep it lubricated. You can leave all the extra stuff  that makes an engine run hanging on it, or you can strip all that unnecessary stuff off. You do have to add a power source like another engine to drive your new compressor.

I know of a guy in TN who made an old VW engine run on two cylinders and used the other two as a compressor with custom valves. He even left it in the VW body so he could drive it (slowly) around his place to wherever he needed compressed air.

An even simpler solution that I haven't seen in years - I used to have a handy device that would screw into a spark plug hole, and had a valve feeding a hose that could be used to fill a tire. Looking back, I never worried much about the fact that I was filling tires with explosive gasoline vapor and air! The six cylinder engine that I had then worked fine on five cylinders, and I imagine if one picked the right cylinders then half them could be used for compression while the engine ran on the other half.

It's mostly a matter of having the right tools, followed of course by knowing how to use them without wasting your materials or your body. In the end you sometimes find that you spent as much as buying a commercial version but you have the fun of doing it, and the knowledge of how well it is made. Of course, I often talk myself into buying a tool for a specific project, justified by the cost savings of DIY, and then I have the tool for free.

Spaceman

JUDITH WILLIAMS wrote:

If I had the ability to turn an old truck engine into a compressor I would never pay full price for anything again.

Sincerely, Judith
Visit my new website at http://www.papercretebyjudith.com

   If you can't explain it simply, you don't know it well enough.

         If we knew what we were doing it wouldn't be called research, would it?

                                                                                                                                           Albert Einstein

EMAILING FOR THE GREATER GOOD Join me

 

---

To: papercreters@yahoogroups.com
From: Spaceman@starship-enterprises.net
Date: Tue, 19 May 2009 23:26:41 -0600
Subject: Re: [papercreters] Re: Stucco blaster

I'm sure your design would work fine for pc if it is mixed to a pulp. I had looked at drywall texture sprayers and they were out of budget for something that I didn't know would actually spray papercrete. I looked around the web and found several designs, including one with a teakettle hopper that was designed by John Cruickshank (sp). They all had the same venturi sprayer principle. I went to a local plumbing supply store and designed on the counter from what they had. It has worked well. It could probably be improved with a little experimentation though I haven't felt the need - since it works I won't "fix" it. The 3' of 4" holds a couple of gallons and weighs close to 20 pounds so it is a two handed sprayer for sure. With a medium grade compressor (12cfm@40psi) and a fifteen gallon tank filled to 110psi I can spray about fifteen minutes and then have to stop to let the compressor catch up. 15cfm would probably be enough to eliminate the breaks, but that's a little beyond the capabilities of a 1hp electric motor. With the regulator feeding me 40psi I can spray about ten feet off a scaffold, nice for the tops of domes. A bigger compressor would be great and let me spray continuously while pumping from the no-tow mixer to the sprayer instead of using a hopper. Since I don't have a grand lying around to buy a nice compressor, I'm planning to convert an old Toyota 4cyl 2.2l truck engine into a compressor. That should give plenty of air flow with the right power source. I mix my pc a bit thin for spraying and the extra water is absorbed by under layers and drains away at the bottom and face. Depending on your recipe you can spray several inches thick, and you might get to experience the sensation of watching a wall slide to the ground when you pass the limit. Shoveling pc from the ground into a wheelbarrow usually introduces assorted trash that will clog your sprayer so you should filter anything you want to spray.

Hat and safety glasses and keep your mouth shut -

Papercrete
is really sweet
but it's not
good to eat!

Spaceman



Greg B wrote:

Wow great minds....... Funny u have the same thing with the washers in mine it sprays concrete based stucco. But i guess if u took them out it would spray pc. I don't know im new to pc. Three feet of 4 in pvc must be fair heavy. With my funnel hopper I just stand next to a full wheel barrow of stucco and scoop it in the hopper as needed. I have no on off valve cause I'm using a compressor without a tank. Im guessing the pressure would be 20 lb. The gun stood about a foot from the wall and there was a bit of back splash. So wear a hat and be prepared to get splattered. It is amazing how well some junk glued together can save so much time and labor.  

Greg

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