Author Topic: Diesel in a gas engine  (Read 4348 times)

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Offline ajinreno

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Diesel in a gas engine
« on: February 23, 2009, 05:38:04 PM »
My son just accidentally put Diesel in our little mid-70's Honda CT-70, and then he and his friends tried kickstarting it to no avail. What does diesel do to gas engines? Can I jut drain the tank and expect it to be fine, or will the diesel in the engine from the repeated kicks do any damage?

Offline TwoTired

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Re: Diesel in a gas engine
« Reply #1 on: February 23, 2009, 05:43:02 PM »
If it hasn't actually run, then just drain it out and replace it.

Diesel has a low octane rating, if it actually ran, it could damage the engine.

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Offline BobbyR

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Re: Diesel in a gas engine
« Reply #2 on: February 23, 2009, 05:56:35 PM »
It is #2 heating oil. She will smoke a bit bt the motor will be fine.
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Offline Spanner 1

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Re: Diesel in a gas engine
« Reply #3 on: February 23, 2009, 06:16:39 PM »
Rudolph Diesel....my hero. He changed the world with his engine, an un-sung hero and pacifist.. y'all should read about him.
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Offline bwaller

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Re: Diesel in a gas engine
« Reply #4 on: February 23, 2009, 06:34:10 PM »
My neighbour did the same thing last summer in his Honda 4 wheeler, but those have a rubber tipped needle in the carb and the diesel caused it to swell, leak and overfill the float bowl. No other issues and with time all was normal again.

I imagine however your CT70 needle is metal only so should be no problems. Drain the carb as well as the tank.

Offline ajinreno

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Re: Diesel in a gas engine
« Reply #5 on: February 23, 2009, 06:41:34 PM »
Thanks for the quick replies guys! I've heard others say similar things about Rudolph Diesel, I'll have to read about him.

Offline mrbreeze

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Re: Diesel in a gas engine
« Reply #6 on: February 23, 2009, 08:10:10 PM »
Rudolph Diesel....my hero. He changed the world with his engine, an un-sung hero and pacifist.. y'all should read about him.
I did a very long time ago.It was an excellent read and I would like to read it again.I remember reading that towards the end of his life,he was having severe headaches (can't recall if thats what killed him).
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Offline mrbreeze

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Re: Diesel in a gas engine
« Reply #7 on: February 23, 2009, 08:18:44 PM »
Oh.......another thing.....back in the 80's,I worked for a trucking company that did electronic transportation (computers). We had a driver down in LA that accidently put diesel in a gas powered bobtail.He got a block or 2 and the truck died. He realized his mistake and had to get the diesel out and gasoline back in.When the truck finally started,I guess it back-fired or something and burned the truck down to the ground with halfa million $$$ worth of equip. in the back!!!! They sent the charred remains (of the equip.) back up to us in San Jose for the insurance to look at.
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Offline paulages

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Re: Diesel in a gas engine
« Reply #8 on: February 23, 2009, 08:32:56 PM »
Thanks for the quick replies guys! I've heard others say similar things about Rudolph Diesel, I'll have to read about him.

he designed the engine to run on vegetable oil. !!  i always wanted to do a SVO consversion on a diesel motorcycle, but they're nearly impossible to find here in the states.
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Offline Sam Green Racing

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Re: Diesel in a gas engine
« Reply #9 on: February 23, 2009, 08:36:37 PM »
I knew a woman that filled the motor to the brim with water, just as she got it full the gas station attendant went over to see why and where she was putting 5 watering cans of water.
She thought she was filling the radiator ;D ;D ;D ;D ;D ;D ;D ;D ;D

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Offline Spanner 1

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Re: Diesel in a gas engine
« Reply #10 on: February 23, 2009, 08:54:33 PM »
Diesel wanted his engine to be on every farm so that every farmer had motive power to run a machine to refine his crop , i.e. to grind his own corn and so make more profit...read about him... if you love C.B.'s ya gotta love this man !!
If your sure it's a carb problem; it's ignition,
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Offline Spanner 1

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Re: Diesel in a gas engine
« Reply #11 on: February 23, 2009, 09:05:03 PM »
he refused to put his diesel engine in the U-BOATS....but the Germans in WW1 stole the patent and went ahead with his technology... he died when German agents threw him overboard on a ferry on the way to England where they suspected he was about to sell his patent to the British...true story!
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Offline Spanner 1

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Re: Diesel in a gas engine
« Reply #12 on: February 23, 2009, 09:33:48 PM »
Rudolf Diesel....read, learn, O.M.G.
If your sure it's a carb problem; it's ignition,
If your sure it's an ignition problem; it's carbs....

Offline motorhead55

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Re: Diesel in a gas engine
« Reply #13 on: February 23, 2009, 10:28:37 PM »
It won't hurt the CT 70....In about 1966, my Dad drove his CHERRY 1963 Porsche up to Monterey Ca from L.A. He ALWAYS pumped his own fuel. Well He pulled into a Signal gas station and proceded to fill his Porsche with what he thought was Regular Gasoline. The attendant finally came out just as my Dad was finished filling the tank and asked "Do you know you just filled your car with Diesel?" Well my dad craped a twinkie!. He drained as much as he could and filled it with premium. He said it smoked and ran kinda poor until he burned some of it off and topped the tank off again.
It is much worse to put gasoline in a diesel than vice versa.
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Offline Spanner 1

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Re: Diesel in a gas engine
« Reply #14 on: February 23, 2009, 10:45:05 PM »
Rudolf Diesel...Soichira Honda... which man had the greatest effect on the world ??
Caution, think about it !!
If your sure it's a carb problem; it's ignition,
If your sure it's an ignition problem; it's carbs....

Offline Gordon

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Re: Diesel in a gas engine
« Reply #15 on: February 23, 2009, 10:58:19 PM »
Rudolf Diesel...Soichira Honda... which man had the greatest effect on the world ??
Caution, think about it !!

It's no contest!  Diesel had the greatest effect on the world.  But what's your point? 

Offline Deltarider

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Re: Diesel in a gas engine
« Reply #16 on: February 23, 2009, 11:50:07 PM »
Diesel??? Rudolph Diesel??! Are you serious?! He is one of the lot that has put us up with these inefficient stinking hot furnaces that happen to have wheels. Are you aware that around 70% of the potential in diesel fuel is lost in heat (exhaust and radiator)??!. I've always learned that back then (beginning of the 20th century) the first cars were electric cars and everybody expected them to stay and develop further. It was not before the big fires in San Francisco (1906) that the direction of development changed as electric fire engines eventually ran out of power where the ones with internal combustion engines prooved reliable. That was the turning point in the history of carmaking, I'm told. Sad, sad, sad and personally I can't wait till we're all moving around with silent, clean and efficient electric motors. An electric motor in every wheel, even a child can think of that! It should have happened long, long ago and would have happened if fossil fuels had not been so damned cheap. Yeah... cheap..., just look at the price we'll all be facing soon. Rudolph Diesel?? If one man has got us in reverse it's him. Besides: what farmer needs a submarine in his garden?
« Last Edit: February 24, 2009, 07:42:06 AM by Deltarider »
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Offline Joksa

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Re: Diesel in a gas engine
« Reply #17 on: February 24, 2009, 01:32:50 AM »
If it hasn't actually run, then just drain it out and replace it.

Diesel has a low octane rating, if it actually ran, it could damage the engine.


IF you get the engine running, it shouldn't be so damaging. Gasoline in diesel engine would.

Offline Glenn Stauffer

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Re: Diesel in a gas engine
« Reply #18 on: February 24, 2009, 02:15:48 AM »
If it hasn't actually run, then just drain it out and replace it.

Diesel has a low octane rating, if it actually ran, it could damage the engine.


IF you get the engine running, it shouldn't be so damaging. Gasoline in diesel engine would.

Actually, I can speak from experience on that one.  Gasoline in diesel doesn't ruin the engine (quickly).  The gasoline burns wrong and results in very low power output which is how I realized that I put the wrong fuel in my 2 cylinder Yanmar diesel tractor.  The opposite of what I would have expected.  Run it long term and you'll wreck the fuel pump and cause other damage, but there is little risk of doing that unintentionally since the engine will run so poorly that you'll quickly notice there is a problem with the fuel.


Offline motorhead55

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Re: Diesel in a gas engine
« Reply #19 on: February 24, 2009, 09:08:18 AM »
Rudolf Diesel...Soichira Honda... which man had the greatest effect on the world ??
Caution, think about it !!
I'd have to go with Rudolf. Diesel power is world wide and used in about every engine equiped application.
1976 Honda 550F bought new in 1978
2006 Yamaha TW200 TrailWay
1967 Triumph 200cc Tiger Cub
2007 Dodge 5.9 Cummins Diesel, 6spd. Stick, 4X4
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1939 Willys Pickup
2003 Kubota B7400

Offline goon 1492

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Re: Diesel in a gas engine
« Reply #20 on: February 24, 2009, 09:50:25 AM »
One thing I have seen no one mention that diesel's are 22.5-1 compression, so much that it needs no spark just glow plug for starting and warming up. Rc nitro powered cars are the same concept, except they can turn upwards to 35,000 rpm's......
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Offline Deltarider

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Re: Diesel in a gas engine
« Reply #21 on: February 24, 2009, 09:58:03 AM »
OK, Spanner 1, I was teasing you a bit there.
Look, what news came in today:
http://www.dieselmotorfiets.nl/dieselmotorcycle_picture_info.htm
Rudolf, as I know him, would have loved it. To bad the Germans submarined him. That was not nice.
« Last Edit: February 24, 2009, 10:05:10 AM by Deltarider »
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Offline bryanj

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Re: Diesel in a gas engine
« Reply #22 on: February 24, 2009, 10:03:07 AM »
OK remeber this :-

EVERYTHING you own, wear, eat, drink and do anything else with was on a Truck at some time and what powers them!!!!
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Offline Deltarider

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Re: Diesel in a gas engine
« Reply #23 on: February 24, 2009, 10:06:19 AM »
There's no need to SHOUT at us.
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Offline Duke McDukiedook

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Re: Diesel in a gas engine
« Reply #24 on: February 24, 2009, 12:34:15 PM »
Tesla and Diesel, two world's greatest inventors.
Both died of dubious circumstances.
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