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Old 04-17-2008, 02:32 AM
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does adding diesel to gas help?

i was talking to a friend who was telling me that adding diesel to gasoline has a benefit when being put into a car that has a turbo charger because it helps prevent detonation.

i do know that diesel engines work on compression(and most have like 20psi)
so it would have to compress more, but is this true? or should this be added to the list of crazy automotive ideas like the 100mpg carburetor
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Old 04-17-2008, 03:14 AM
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I've known of an incident where diesel was accidently added to a petrol fuel tank, plenty of white smoke out of the exhaust. TBH I really haven't heard of this idea, but I have heard that if you add it to your oil before an oil change, it works as an engine flush.

Last edited by ron2003_h; 04-17-2008 at 03:16 AM. Reason: Bad grammar, my bad.
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Old 04-17-2008, 07:47 AM
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diesel would make the mixture harder to ignite yes, in theory it could stop detonation.. but it's going to run like crap too.
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Old 04-17-2008, 07:48 AM
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Diesel is nothing but refined oil.

The reason diesel motors do not detonate is because there is no fuel in the cylinder on the compression stroke. Thus nothing to burn.

When the piston reaches the top of the stroke fuel is sprayed into the cylinder and it ignites from the sheer pressure and heat in the motor. NOT from a spark plug.



So in answer to your question.....NO all you will be doing is reducing the octane rating of what is in the tank......the very opposite of what you want to do.
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Old 04-17-2008, 07:58 AM
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Quote:
Originally Posted by Holder350
Diesel is nothing but refined oil.

The reason diesel motors do not detonate is because there is no fuel in the cylinder on the compression stroke. Thus nothing to burn.

When the piston reaches the top of the stroke fuel is sprayed into the cylinder and it ignites from the sheer pressure and heat in the motor. NOT from a spark plug.



So in answer to your question.....NO all you will be doing is reducing the octane rating of what is in the tank......the very opposite of what you want to do.
it would actually decrease the octane but it is harder to ignite so it wouldn't have the effects of a lower octane, but because of the reason it lowers the ability to ignite.. the motor will have low power and run like crap
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Old 04-17-2008, 07:58 AM
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I don't think add diesel to a gas motor would be good. Diesels run very high compression, around 400psi and then most run a turbo or blower and make 15 to as much as 200 pounds of boost, on a pull tractor. You can't get that kind of cyl pressure in a gas engine.
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Old 04-18-2008, 10:50 PM
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tried a little in a air cooler engine it acted like a lube ,,,it had a sticky valve
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Old 04-18-2008, 11:36 PM
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Quote:
Originally Posted by 86regal
i was talking to a friend who was telling me that adding diesel to gasoline has a benefit when being put into a car that has a turbo charger because it helps prevent detonation.
Why not just run the correct grade of gas to begin with?
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Old 04-19-2008, 01:44 AM
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dude, deisel fuel has an octane rating of like 25.
350 holder is right on in his explaintion--good work you young kid-->
putting deisel fuel in a gas engines tank is just plain stupid.
we used to get the occasional moron who filled up their gas car at the deisel pump, they would get about a block away, start smoking like crazy and then just ping and quit, then come in to our shop on the back of a tow truck. these morons paid us big bucks to drop and drain the tank, flush the fuel lines (this was in the 70s-80s) and rebuild the carb.

so for the benefit of all us shop owner guys, tell your buddys to put some deisel fuel in their tanks.

deisel fuel now days is more expensive than premium so it must be better than premium....

what's up with that???
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Old 04-19-2008, 08:27 AM
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I have seen this done, back in the early 80's this idea came up around the mines and and the way it was done was to add 1 or 2 gallons to a tankful of gas in 4X4 pickups. What happened? Not much when only a gallon or so was added to about 18 gallons of gas but as the mix went up it began to show white smoke in the exhaust and detonation when under a load. It was supposed to increase power and fuel millage but even the die-hard backers of the idea eventually admitted that it really did not work.
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Old 04-19-2008, 10:00 AM
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Quote:
Originally Posted by techron
350 holder is right on in his explaintion--good work you young kid-->

Thank you sir!

I'v been in the auto parts industry for about 4 years now so......I'v learned quite a bit from others mistakes~!
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Old 04-19-2008, 10:03 AM
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No No No

If you add diesel to the fuel of a gas engine you will ruin it. It is a super penetrant and will remove the residual oil coating left behind as the piston goes down in the stroke cycle. This in turn will cause significant early piston ring wear and the engine will begin to lose compression over a short period. Then you will have a smoker and will lose power and along with that you will lose gas mileage. A diesel engine is much higher compression, which means the rings are better and the clearances are tighter on the ring to cyl seal.

It is true that diesel will clean out your engine, but at what cost.. Adding it ti the oil will clean the oil galleys, main bearings, cyl walls etc. but might do more harm then good.. Gunk engine wash is based in diesel along with other additives, but is only to be used for a few minutes of engine run.... If you run this stuff in a hot engine or at high speeds it will cause failure!!!! Read the can.
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Old 04-19-2008, 10:11 AM
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Diesel to gas engines

The idea is not sound but falls into the area of might be a good idea, however it ain't!

Octane: why does everyone think that higher octane, means hotter fuel somehow? Or higher octane burns much hotter or faster? The opposite is the truth. Higher octane fuels actually burn a little slower, producing more energy push as the piston goes down in the power stroke of the engine. Cheaper grades of fuel flash off quicker and do not push with as much force on the piston.... Thats how it works. Adding diesel could help in theory, but in reality the idea just goes up in white smoke!
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Old 04-20-2008, 08:33 AM
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Quote:
Originally Posted by techron
dude, deisel fuel has an octane rating of like 25.
350 holder is right on in his explaintion--good work you young kid-->
putting deisel fuel in a gas engines tank is just plain stupid.
we used to get the occasional moron who filled up their gas car at the deisel pump, they would get about a block away, start smoking like crazy and then just ping and quit, then come in to our shop on the back of a tow truck. these morons paid us big bucks to drop and drain the tank, flush the fuel lines (this was in the 70s-80s) and rebuild the carb.

so for the benefit of all us shop owner guys, tell your buddys to put some deisel fuel in their tanks.

deisel fuel now days is more expensive than premium so it must be better than premium....

what's up with that???


That same thing happens when some idiot thinks he is stealing tractor gas out of the diesel barrel.

I have put gas in diesel fuel in really cold weather to keep the diesel from jelling up. Not much though, about a gallon in each 150 gallon tank.

When I was a teenager I poured a tiny stream of diesel down the carburetor of my car just to see how much smoke I could get out of it.
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Old 04-20-2008, 08:48 AM
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Hey now, don't be wasting my precious diesel in those gassers. It costs enough as it is without the extra demand. It doesn't work anyway. haha Bad enough I had to give up the CI-4 oil. Actually the diesel guys have hogged more of it than us hotrodders.
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