Vapor carburation

[Hickory]

Vehicles will run of the air bubbles method but it actually runs rich that's why he had to choke the air flow down to control the bubbling. That is a good way to start till you get some heat into the fuel. Then it would use less gass and it wouldn't look as discolored.

[FarmerJon]

1 hour ago, OUTFXD said:

 

2-3% mileage increase may not seam like much,  but on a vehicle that gets 50-100 MPG 2-3% increase is actually pretty significant! (Replying to the video)

 

36 minutes ago, Hickory said:

Vehicles will run of the air bubbles method but it actually runs rich that's why he had to choke the air flow down to control the bubbling. That is a good way to start till you get some heat into the fuel. Then it would use less gass and it wouldn't look as discolored.

I am pretty impressed.

It was pretty clear to me that his system would benefit from some refinement. A 3/4" ball valve isn't exactly a precision metering device.

Also multi cylinder engines would likely see better results, due to better fuel distribution. 

[Hickory]

And how he had two hoses going into the fuel I would have had one in the fuel and a smaller one drawing in fresh air near the top of the fuel level. Then it's more vapor and less agitation. Then he could have opened the ball valve more.

[OUTFXD]

And heat the fuel,  not alot.  but enough to encourage vaporization.

 

Edit:  And now that Ive said that I realise I just repeated what Hickory said a few posts back.

Edited July 28, 2023 by OUTFXD

[Hickory]

Bingo?

[Hickory]

I would like to try it on my 29 but I don't have a water bypass system in the coolant. I could drill and tap the head but I would have to make a pipe with a "y" in the lower radiator hose for the coolant to circulate.

[FarmerJon]

The diagram you posted leaves me with some questions. 

is the incoming air  controlled by the throttle plate?

if it goes straight though to engine in big tube, why would it also flow down through the "mixing chamber". Air is going to follow path of least resistance. 

what is the reality of driving around with a "tub" of gas on top of the engine? The yellow lines are where it would have to be open to the intake tract, and would be subject to sloshing around. It is obviously somewhat segregated,  but in vigorous driving it would be prone to moving away from the air intake tube (not making consistent bubbles) and possible ingesting of raw fuel into engine.

 

It is cool that the concept of sucking air though gas works, but it seems it would suck to drive around with.

 

Also: Why route coolant into it, as it would seem easier to regulate the temperature of an electric heating plate.

Instead of having the "tub" of fuel, why not regulate fuel, air and heat separately?

Have a fuel injector spraying onto the hot plate to make the vapor, and have the throttle (metered air) controlling the fuel injector's output.

 

On cold start up, injector/s would act like primitive fuel injection, for the few seconds it would take for the plate to get up to temp.

From there, the fuel vapor quanity and mixture would be controlled by airflow, either mechanically or electronicly via mass airflow sensor and O2 sensor.

You could have multiple injectors/heat plates for various functions, IE idle, cruise, rapid acceleration.

You would end up with far less excess air/fuel mix in the system, and would be impervious to slosh.

Fuel could be pressurized and heated with engine heat to further aid vapor production. Once engine was up to temp, that alone might be enough, so electric hot plates would shut off.

 

Edited July 28, 2023 by FarmerJon

[Hickory]

So that is someone else design I used as an idea. Throttle plate would be at #4 or stock carburetor. Choke plate at #1 that way you can control the bubbling. Baffles at #3 to keep liquid out of airstream. Electric plate would work but I just feel safer using a coolant loop. I wouldn't use heater cores but just a pipe looped in the box. For safety reasons and performance I would like to use a belt driven mini roots supercharger at #4. This would also assist cold starts.

[Los_Control]

The lawnmower carb is a good one. I did not watch the video link posted ... I probably should.

I think it was around 1982-83 .... Victor was my Uncles best friend & lived down the street.  He came over one day while I was their working on my truck.

He was driving a crapped out 1967 chebby truck with a V8 running off of a lawnmower carburetor.  ..... I was impressed.

 

Thing is it seemed to run just fine sitting there idling. We were in a large housing development .... it ran fine 15-25 mph around the development.

It even ran 35 mph on the access road ..... Any cross street he came to was either 45mph or 55mph ..... he could not drive those roads adequately.

He stated he was just playing with it, had some more ideas to fabricate & work out ..... Uncle or I never heard one word about the truck again.

 

Fast forward to today .... I saw this link today and thought some participating in this thread would like it .... I dunno.

I know nothing about it, I did think it was interesting to watch though .... maybe you will also.