Gasoline mix??

[Matt400]

Does this mean I should fill up 50/50 mix with gas/diesel?

Diesel used as gasoline 'spark plug' improves economy and emissions

 

[cj hall]

gas and diesel mix

hello matt

no it sounds like its two fuel systems run by a computer blending the two and the point of injection.



running the gasoline in the diesel is no big deal but at the amounts they are claming it would hard to control the gas from exploding at the wrong time.



I have run my cummins on 50% gas for a short time it sounded funny and I only did it by mistake. I put 1/2 tank of reg gas in my 2001 and ran it for 20 miles then filled up with vegetable oil then ran it to 1/2 tank then again filled it up with more oil. once the oil got in the tank it sounded better.



I run gas in the vegetable oil blend I use and it has caused no problems so far been running it for around 4 years now in my 2004 dodge also run the blend in 2 -2001 dodges and 6- 7. 3 fords, vw jetta .



i would not try the 50/50 blend but its up to you,



good luck

 

[Matt400]

i would not try the 50/50 blend but its up to you,



good luck

Hi CJ, I was being sarcastic. Saw the article and thought I would post it and had nothing else to add but that.

 

[seafish]

Caught the sarcasm first time around, Matt. It IS an interesting article, as are some of the other alternative engine design links on the page you link too. Thanks.

 

[PWirth]

I read about this on the University of Wisconsin's website. They claim much lower combustion temperature from either a normal gasoline or diesel engine. That is what gives the better thermal efficiency. They used what looks like an older Cat 1 or 2 cylinder diesel (from a picture I found). They inject the gasoline into the intake and the diesel through the normal diesel injectors. My best guess on how they are able to make this work is by keeping the gasoline relatively lean (greater than 18:1). It is extremely hard to make an lean gasoline air mixture ignite, so they use the diesel to create a widespread ignition source.



My dad has an old Isuzu diesel pickup that my brother rolled. The engine still runs. I am putting plans together to try to validate their test results. It seems that there wouldn't be much variation in the amount of diesel actually injected since it there to support the function of the spark plug. I think that I could drill in a gasoline injector or two, add a throttle position sensor, a crank position sensor, and a megasquirt EFI controller to be able to run the motor. When I got done I could put the megasquirt on my boat. I have been wanting to do that anyway. I thought about using a carburetor but I don't know how I could control it because I can't use the throttle plate. Maybe a needle valve on the fuel flow to a venturi, but that would be hard to connect to a pedal. Does anybody have an old Chevy TBI around?

 

[SKuyper]

I dont know how the university did it... at today's compression ratios of diesel engines, the gasoline would ignite way before top dead center AND gasoline introduced into the intake manifold without a way to meter it WILL cause a runaway engine as there is no throttle valve in a diesel to control air intake volume. Case in point. I'm a volunteer firefighter and a few years ago a diesel powered tanker truck was offloading gasoline at a fuel tank farm near my home. The truck was idling slowly and there was a spill. . the vapors reached the truck and the gasoline vapors ignited pre full stroke of the engine causing it to rotate backwards, it started and ran backwards long enough to blow the air filter out and start a fire... whole place blew up and burned to the ground... . Aside from that... gasoline is a solvent and because of that is very very hard on close tolerance high pressure parts like injection pumps and injectors.