Adding Diesel to gasoline

[whatmaycome14]

I just finished reading this entire thread. So, the few guys that have actually tried small amounts of mixed diesel in with the gas have said that it works. And there are cases where filling up with diesel killed the engine/ poor performance.

Then a bunch of other theory and speculation about why it does or doesn't work.

Is that an accurate summary?

[Tulok]

Ha ha! poison.
I would say, if you have an old vehicle try it yourself!
but please, don't fill up your prius with it.

[UFO]

Originally Posted by Tulok

Ha ha! poison.
I would say, if you have an old vehicle try it yourself!
but please, don't fill up your prius with it.

That's funny, I cannot imagine why anyone would do this. Is it like smoking banana skins, it makes you look hardcore ?

[teoman]

Originally Posted by Tulok

I know this is an old thread, but I mixed in 1 gallon of diesel in my 20 gallon tank of my 1999 Infiniti Q45 and saw no change in fuel economy in heavy city driving.

I also mixed in 4 gallons in my 40 gallon tank in my suburban while towing a 1400 mile trip and I saw no change in mileage. I am going to try mixing more diesel into the suburban on future non-towing trips after I have done a few eco-mods because I do think that lindsay jim may be on to something.

I am more interested in mixing waste motor oil or ATF with gas to reduce waste.

In one situation, before I was familiar with my unreliable fuel gauge, I ran out of gas about 8 miles away from a gas station!

All I had was 1.5 quarts of new engine oil so I dumped it in the tank, and fired up the engine on fumes and drove to the gas station. It was smoking out the tailpipe but not as bad as i would have thought. I'm sure that it mixed with the gas at the bottom of the tank, so it wasn't PURE OIL.

This was on a TBI fuel injected setup so the injectors have a high flow rate and aren't easily clogged like smaller MPFI injectors.

I know another thread resurrection from me, but a friend used to mix used engine oil with a solvent. Once mixed, over time, the particulates in the engine oil would settle out. (He was not using it as a fuel). So maybe pre mixing your used oil with gasoline and letting the particulates settle our may be a good idea (or acetone) if you decide to go that toute.

[redpoint5]

I drain the 2.5 gallons of oil from my truck into a clean oil pan, and then pour it directly into the fuel tank to mix with the other 30 gallons of fuel.

The oil has been filtered thousands of times through the oil filter, and then there is the fuel filter before it goes to my injectors. The fuel filter alone should keep any particles large enough to clog an injector from reaching them.

[Fingie]

Originally Posted by redpoint5

I drain the 2.5 gallons of oil from my truck into a clean oil pan, and then pour it directly into the fuel tank to mix with the other 30 gallons of fuel.

The oil has been filtered thousands of times through the oil filter, and then there is the fuel filter before it goes to my injectors. The fuel filter alone should keep any particles large enough to clog an injector from reaching them.

Oil filters aren't that good for tiny particles compared to a fuel filter.

Not that you'll notice any fuel filter clogging on that amount of oil in the normal lifetime of a diesel filter.


my friends shop run a forklift on a heavy mix of diesel and waste oils, they have to clean it pretty often

but it's still cheaper

i've ran old 2-stroke gas (15% of total fuel) in my wagon, because it wouldn't run in a weedwhacker. Didn't notice anything

[cRiPpLe_rOoStEr]

I'd not be too inclined to try regular Diesel fuel in a spark-ignited engine, unless it had direct injection like the old Hesselman engines that used to be popular in Swedish trucks until the '50s or those Evinrude multifuel engines used in small military boats. Spark plug fouling would still leave me concerned anyway. If I would ever attempt to blend gasoline with some heavy fuel other than kerosene, I'd rather add straight vegetable oil or biodiesel instead of regular Diesel.

[teoman]

I am researching this for a couple of reasons.

First my car is dual fuel, so once the engine heats up it switches to lpg. The fuel just sits in the tank for some time. If i could make it evaporate less that would be a good thing.

Secondly i will have steam injection which will heat up the incoming air accelerating combustion speed and is also good for knock suppression.

I very rarely exceed 2500 rpm and diesel over here costs much less than gasoline.

What ratio would bring down the vapor pressure of the fuel?

[cRiPpLe_rOoStEr]

Probably the steam injection could help vaporizing the Diesel fuel due to the added heat into the air intake stream and increased internal pressures.

[teoman]

That is what my logic tells me, and all that I have been reading on the subject.

But there is always the famous fact:

The difference between theory and practice is that in theory they are the same but in practice they are completely different.