Yes, a pair of 1/2" fender washers. They’re 2" diameter.
Right. What I’m trying to say is I’m not sure a valve (air or gas) much larger than one side of the throttle body ( that has to flow both) will help much.
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OK, here’s the test of the second diaphragm from earlier today. Excellent responsiveness to low volume (mouth) suction and blowing. Well within range of gasifier suction.
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Wasn’t DJ using about a 4" diameter diaphragm? I thought Max mentioned some importance there.
Max said don’t go too small, they’re less sensitive. He says DJ’s truck mixer is much too small, the Volvo is just right, although it’s dual diaphragms and I’m not sure how that compares to a single.
I can’t see the harm in a great big one, so this one is 9.5" across.
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While I’m posting here, might as well put up some pictures of the one successful automixer in existence. This is the one from Dutch John’s Volvo. He says it did as good a job as anyone could by hand.
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I don’t think I have seen this video before. When I saw those pictures before, I would’ve figured there would have been more movement on the rods. So what if your diaphragm plate was more like 4"?
No idea…? It’d probably still work OK. I’ll ask Max again Friday, but I think bigger diameter is better, limiting factor being the hood has to close.
EDIT: you said diaphragm plate, meaning overall diameter? Or something else?
I think that would be better.
Yeah, I should have been more clear. Instead of the 2" washers. I was just thinking of the picture Marvin put up. The plate of the diaphragm is just short of the total diameter of the diaphragm itself.
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Gotcha. Yeah, that makes sense. Bigger diaphragm plate… yep. Can do.
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http://www.ebay.com/itm/280988358420?_trksid=p2057872.m2749.l2649&var=580143305865&ssPageName=STRK%3AMEBIDX%3AIT
I ordered one of these too. It’ll be a couple of weeks before stuff gets here on the slow boat. You might look for something like this in a printer or something?
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Ooh fancy!
My bushing right now is the inside of a plumbing fitting welded to the top of the tank… not the smoothest.
I’m thinking about going for a lighter weight rod on the diaphragm. Right now I’m using a 5/16 x 8" steel bolt. Less moving mass should mean more energy available to the job at hand…
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Ok I’m getting a head ache!! I have read this thread from top to bottom 4 times and it might be seeping in a little. DJ uses 2 diaphragms because he has the hose from the gas side going to one diaphragm and the hose from the air going to the other diaphragm. The action of the diaphragms appose each other. You are putting the gas hose on one side of your diaphragm and the air hose on the other side.TomC
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Sorry But still studying. In the 2nd picture of DJ’s that you posted; there are 4 openings. One for air, one for gas, and one for the air/gas mix. Is the 4th one for one of those heated wire sensors and if so he has air flowing in that opening also. ( if that is the case, I don’t think American cars have used that sensor )
What is the gizmo in the 4th picture. It is attached to the throttle but it appears to move horizontally by pulling a cable. ??? It also has another pull cable attached — a throttle control pull cable??? TomC (again)
What is this thing actually doing?
Are you simply assuming that a higher intake manifold “vacuum” reading means that you need more woodgas and, if so, close the “choke” more?
Or just the opposite?
Or something completely different from the above?
Pete Stanaitis
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Not sure if Chris is still on here so I’ll stick my nose in. This takes the place of the pull cable that we set the balance of “air” to “gas” ratio. When that meter that is hooked to the exhaust pipe says we are running rich, we move the cable to allow more air in to get the infamous stoeometric ration. Usually in driving we don’t have to move that very often. This thing is going to always give you an optimal air fuel ratio.(?)
Seeings I don’t adjust my air/fuel mix after I get it rolling, I’m not sure what the benefit is. TomC
I do know it will help my Dakota. Sometimes after a cruise and I come to a 4 way stop or a light, my mix will be really lean and stall out. (embarrassing)
Nice idea once the bugs are ironed out,and adjustment could be made,a throtle stop switch and stepper motor might be another way too go for idle air mixture control for stop light’s or coasting.Then again the auto mixer might fix that Too.
Max has always said a bigger vac pot is better, I think your 9 inch is on the money chris. I too think a larger diaphragm stiffener is in order. Keep it up Chris can’t wait to see it work for ya.
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