Saito FA-80 Run on Davis Diesel Fuel

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A crazy idea I got from this thread on RCGroups, www.rcgroups.c...
It turned out not to be so crazy after all. Unsure how practical it is given the issue with obtaining or making diesel fuel, but hell it ran! Davis Diesel, Maaster Airscrew 14x6, OS F plug.
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28 сен 2024

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Комментарии : 64

@Migueldeservantes 5 лет назад

There was a channel a few years back, An older gentlemen that use to make almost any engine with different types of modified vegetable oil and the type of additive use to spike up regular Diesel fuel.. it was an awesome channel...

@g0fvt 5 лет назад

As a kid I found I could start a Cox .049 without a glow battery by priming it with diesel, no electric starters then either. In this example I wonder if the pre-ignition is related to the glow plug, might be worth trying a plug with the element removed or blanked off?

@FMo01 6 лет назад

That's incredible. I did not think the engine would run so well on diesel.

@dmrcflyr2 6 лет назад

I was pleasantly surprised as well. Hopefully one run did not do any permanent damage to my engine.

@carlosextra300 5 лет назад

What a good video! that you modified him? fabulous, You make a video of the changes you made to him and the fuel. Best regards

@raymond-y2s Год назад

I USED TO FLY CONTROL LINE WITH DAVISV AS KIDS IN HIGHLAND PARK N.Y.C.

@aSpyIntheHaus 18 дней назад

That sounded great

@lilvincenzotux6720 6 лет назад

David that’s crazy and insane please if can answer this!! A) did it have any internal damage after you ran it B) is the glow plug any good. And if you get another chance run a crap four stroke with the same compression rate and peak it out!!!! Awesome video keep it up👍

@dmrcflyr2 6 лет назад

I did not open up the engine to inspect for damage, but I HIGHLY there would be any after just a singe run. Now 10-15 runs then there might be some damage to the connecting rod or other parts over time as the engine was not designed to run like this. It ran just fine on glow fuel afterwards and the plug was not damaged at all. I do have a fellow sending me a junker Saito 80 and some shims to install under the head to adjust the compression ration. SO a few more runs on that engine might be happening.

@johnkelinske1449 6 лет назад

Interesting, but likely frightfully hard on the engine. I note that Enya made some changes to their production .41 and .36 4-stroke diesels vs the glow versions of same- long term use and durability over that being the main issues.

@mikeeiben3430 6 лет назад

A friend of mine did a diesel conversion on a. 46 2 stroke. The connecting rod failed after about 10 hours of flight. I think he was running a 12x6 or 12x8 propeller, that would be a lot of load.

@dmrcflyr2 6 лет назад

Oh, I am not running this engine on diesel fuel any more. Simply an experiment only.

@johnkelinske1449 6 лет назад

Exactly as I thought.

@johnkelinske1449 6 лет назад

I had a Mk 1 Drone diesel that someone else ran on model diesel fuel- the compression was gone and the main bearing was pounded out so bad you could rock the prop back and forth a good 1/8" at the tips.

@rodderbeck1591 5 лет назад

i wonder if you put a 2 stroke long plug in instead of the F plug if it will raise the compression up enough to stop the knocking since its taking up more space inside?

@dmrcflyr2 5 лет назад

Well an F plug is the longest plug made so doubtful. This engine is just not designed to run on this fuel.

@halroofner4069 6 лет назад

Lot's of balls brother. What about a mix of 20% nitro and diesel?

@sheridanbaldwin8629 5 лет назад

No black smoke it's surprising runing on diesel. it burns it pretty clean your was hand was dirty as hell lol the engine knock was not to good 🙃

@8ackbar 6 лет назад

They run better than the OS engines, the compression is higher on the Saitos. My saito .40 runs the same.

@carlosextra300 5 лет назад

Did you modify your saito to run on diesel?

@harveynewman4333 6 лет назад

that's cool; as hell. wonder how the fs80 would

@Flies2FLL 3 года назад

That should not have run. These have at best 10:1 compression, I don't think that is enough to properly ignite diesel fuel. BUT, somehow it started. Also, diesel fuel alone will not lubricate the cylinder walls, this engine needs castor oil for that. Glow fuel is methanol, nitromethane [typically 10%], and castor oil. He probably destroyed the compression on that short run. Cool video, even if you did probably destroy an engine-

@dmrcflyr2 3 года назад

Well you are wrong. I did not destroy the engine at all.

@northwind9505 6 лет назад

well that was cooool! i do wonder how long your engine would hold up. i did hear the knocking.

@johnkelinske1449 6 лет назад

Not very long. Ask your mechanic next time you are in his shop if it is okay to drive your vehicle with the engine knocking, see what he says.

@DBJr1980 6 лет назад

Sometimes if a rod fails, it can be thrown out the side of the engine block. I've heard rod knocking in a car engine before. It gets louder as it gets worse.

@johnkelinske1449 6 лет назад

Eventually, that will happen. Once long ago a friend of mine was flying an old Guillow's Rat Racer with a Fox .35X on it. About half way through the flight, there was a loud bang and then silence. Examination of the engine after landing showed the con rod big end had failed and the rod punched a hole the size of a quarter thru the bottom of the crank case. His dad was a master with engines and we hunted up the missing piece out on the flight circle. He heli-arced it back in place, replaced the rod, and a couple weekends later the engine was back in action.

@midwestsirens 5 лет назад

How did you start it without a glow plug igniter connected?!?! wow!

@dmrcflyr2 5 лет назад

Because it is model diesel fuel.

@midwestsirens 5 лет назад

@@dmrcflyr2 Ohhhh. You "dieseled" the engine by igniting the fuel with compression alone.

@dmrcflyr2 5 лет назад

Yes, hence the title of the video and I also explain it in the intro.

@midwestsirens 5 лет назад

@@dmrcflyr2 Cool. I never would have thought dieseling would work with such a small engine. I also find it interesting how you even started it with dieseling.

@aerofan778 6 лет назад

How did it run on the glow fuel after?

@dmrcflyr2 6 лет назад

I have not done that just yet. I do not expect anything unusual. I am doing just to clean the engine out. The glow plug survived.

@marvinwooster223 6 лет назад

Now you've done it ! Why not try, 2 stroke gasoline ? It's not as Messey or smelly as diesel ! Keep up the good work !

@dmrcflyr2 6 лет назад

I actually prefer the smell of diesel fuel/exhaust to gasoline any day.

@johnkelinske1449 6 лет назад

Probably because it won't work. Diesel has ether in it which is what causes the ignition, gasoline doesn't.

@yewwtooob Год назад

Gasoline needs a high compression to ignite. We used it to start diesels in the military because it is available, cheap, and not as destructive to the engine as ether.

@danesharp6282 2 года назад

WTF ..... but why not .... nice .

@chrisj8307 2 года назад

Whats the point?

@dmrcflyr2 2 года назад

I think I answered that in the intro. What's your point?

@chrisj8307 2 года назад

@@dmrcflyr2 none, missed intro.

@davidhobbs5573 5 лет назад

There is no need to be concerned about peaking it, a Diesel simply quits when tuned lean.

@sjoerdwouda Год назад

wtf wow

@russelllandreth2010 5 лет назад

oh yes the mess of diesel fuel lollol

@thebug4046 6 лет назад

wow! i did not think that was going to work you should give it a shot on a 2stroke next for the hell of it

@dmrcflyr2 6 лет назад

I have an entire video series on the OS 40 FP with a diesel head on it. I do not think a standard 2 stroke engine would operate on diesel fuel.

@thebug4046 6 лет назад

David McIntire I seen that video before but it would be interesting to see what happens

@dmrcflyr2 6 лет назад

Well that is the reason that diesel heads were made for 2 stroke engines. They do not lend themselves to operation on that fuel without adjustable compression.

@johnkelinske1449 6 лет назад

Exactly. It is like running a gasoline engine with the spark either advanced or retarded too much- not good for either engine or your wallet.

@johnkelinske1449 6 лет назад

Not much.

@enginetoe1978 6 лет назад

Very great video and information, yes your saito is nocking very bad. But it is so funy to see that a 4Stroke runns with Dieselfuel. Congratulation... perhaps you can modify the compression ratio to stop the nocking at full throttle.

@russelllandreth2010 5 лет назад

you know that could be a break threw some people mite not like that all those diesel that was wild

@XATOR990 4 года назад

Did you try to run it without a glowplug (filament removed)?

@luisgarza2036 6 лет назад

It starts easily and works as a test, but knocks very hard, poor piston-conrod. Maybe less ether, and higher content of cetane booster to control for a smoother combustion. Thats the theory. Great test David!

@johnkelinske1449 6 лет назад

There is a very good reason you don't run any fixed compression engine on model diesel fuel- there is no way to vary the compression ratio and so adjust the ignition timing. The old Drone and Micron fixed compression engines were meant to be run on a straight ether/mineral oil fuel, that is it. Running them on model diesel today will destroy one in short order. The same is true of these 4 strokes with fixed compression.

@luisgarza2036 6 лет назад

John Kelinske and if you add the fact that probably the glow plug started to glow after the element heats up, that contributes to advance timing even further, probably testing with a bad plug after extracting the rest of the platinum alloy coil could cure partially the knocking.

@johnkelinske1449 6 лет назад

It won't cure the simple fact the engine wasn't designed nor intended to be run that way. The element doesn't glow from heating up, it glows from the catalytic reaction to the alcohol in the fuel when running on glow fuel, the initial heating of the element by the battery to start is only until the reaction starts to take place when the engine begins running.

@yewwtooob Год назад

But your other engine did not knock.