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Old 14-01-2013, 17:32   #1
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Worlds smallest diesel engine....

If you like Diesel engines you've got to see this! If you are short on time cli in after 4 or 5 minutes... https://www.youtube.com/watch_popup?...CsiD8&vq=large
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Old 14-01-2013, 18:16   #2
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Re: Worlds smallest diesel engine....

Maybe I'm a sceptic, but no cooling system, no lubrication system.... on one viewing the camshaft timing gears looked to be the same size as the crankshaft gear - they should be twice as big... I'm wondering if it really ran.

Beautifully made model though.
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Old 14-01-2013, 18:18   #3
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Re: Worlds smallest diesel engine....

Hard to believe!
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Old 14-01-2013, 18:47   #4
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Re: Worlds smallest diesel engine....

Quote:
Originally Posted by 44'cruisingcat View Post
Maybe I'm a sceptic, but no cooling system, no lubrication system.... on one viewing the camshaft timing gears looked to be the same size as the crankshaft gear - they should be twice as big... I'm wondering if it really ran.

Beautifully made model though.
The cooling system was described in the video at 7:34 when the words "Bomba de refrigeracion" came on the screen for the cooling pump until 7:47 for the coolant "Enfriador de agua dulce".

Looked like it was running pretty good at the end of the video.
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Old 14-01-2013, 19:07   #5
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Re: Worlds smallest diesel engine....

Quote:
Originally Posted by 44'cruisingcat View Post
Maybe I'm a sceptic, but no cooling system, no lubrication system.... on one viewing the camshaft timing gears looked to be the same size as the crankshaft gear - they should be twice as big... I'm wondering if it really ran.

Beautifully made model though.
Depends what you mean by 'ran'. It's driven by compressed air, so is in effect a steam engine. It would be rather tricky to build a fuel system, and the RPM required for it to run would probably prohibit extended use without an oil system. But I agree - a really, really beautiful bit of model engineering!

It is possible to build a diesel engine this size though, but it has to run at substantially higher RPM than our V12 model.

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Old 14-01-2013, 19:34   #6
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Re: Worlds smallest diesel engine....

There were numerous small diesel engines (not glow-plug type) that were made for model airplanes from the 1930s on that were about that size.

http://antiquemodelenginesrunning.bl...el-engine.html
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Old 15-01-2013, 00:18   #7
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Re: Worlds smallest diesel engine....

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Originally Posted by europaflyer View Post
Depends what you mean by 'ran'. It's driven by compressed air, so is in effect a steam engine. It would be rather tricky to build a fuel system, and the RPM required for it to run would probably prohibit extended use without an oil system. But I agree - a really, really beautiful bit of model engineering!

It is possible to build a diesel engine this size though, but it has to run at substantially higher RPM than our V12 model.

I had a control-line model aeroplane with a diesel engine when I was at school. IIRC it was about 2.5cc. Used to run on a mix of methanol, ether, and castor oil.
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Old 15-01-2013, 04:41   #8
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Re: Worlds smallest diesel engine....

Looks like it is just motoring on air. I don't see any injectors.

https://www.youtube.com/watch_popup?...CsiD8&vq=large
is more impressive, to me. What a nifty little tender engine!
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Old 15-01-2013, 05:59   #9
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Re: Worlds smallest diesel engine....

Quote:
Originally Posted by 44'cruisingcat View Post
I had a control-line model aeroplane with a diesel engine when I was at school. IIRC it was about 2.5cc. Used to run on a mix of methanol, ether, and castor oil.
I had a number of small diesels model aircraft engines in the early 60s.
IIRC, they were Ohlsson & Rice. Had a butterfly fitting on the head. Started on methanol until hot, and then switched tanks to a castor oil blend, IIRC
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Old 15-01-2013, 10:00   #10
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Re: Worlds smallest diesel engine....

This is more the thing!

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Old 15-01-2013, 11:01   #11
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Re: Worlds smallest diesel engine....

Astrid.... You never cease to amaze me with your knowledge...

europaflyer... if you think about it, a V-12 of this size could theoretically be run far slower than the speed of a single cylinder...
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Old 15-01-2013, 11:14   #12
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Re: Worlds smallest diesel engine....

Quote:
Originally Posted by GrowleyMonster View Post
Looks like it is just motoring on air. I don't see any injectors.
You don't need injectors for an engine to "Diesel", the fuel/air mixture is admitted through the intake valve and then ignited by compression.
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Old 15-01-2013, 11:43   #13
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Re: Worlds smallest diesel engine....

SOME PEOPLE THINK THEY ARE MACHINISTS ... AND SOME REALLY ARE!

Here is one of my favorites!
For all you out there who like big, honking V-8's and screaming' V-12 engines, check out this tiny version that you could run on your workbench or kitchen table. These models were built by craftsmen the same way the big ones are made by machining billet stock and castings, but in miniature. This is not just a model that look like an engine, it is a real running engine. This photo was taken from the Joe Martin Foundation Craftsmanship Museum but many more images can be found elsewhere on the web, and an engine like this can be seen in person at model engineering shows around the country.

The late Lee Root built this tiny scale Corvette engine. The major components were machined entirely from solid billet aluminium that has been bead blasted to look like castings, and it will turn 18,000 RPM! The coin you see in some of the photos for size reference is a US Quarter. The valve covers are just 4-1/2" long, and the miniature spark plugs are commercially available.

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Old 15-01-2013, 13:24   #14
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Re: Worlds smallest diesel engine....

As a rule of thumb, I've found that the titles of YouTube videos are inversely related to the content.

"Storm" means good sailing breeze; "Knockdown" translates to splashing the sidedecks, "Scariest" means ho-hum, "Survival" implies limited access to www.

Someone recently claimed the southermost sailing record for all time, when in fact it wasn't even a record for that month !

(Shades of John Lennon's tongue-in-cheek comment "He's not even the best droomer in the Beatles!")

"World's smallest" etc generally seem to conform to this rule, IMLE...
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Old 15-01-2013, 13:49   #15
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Re: Worlds smallest diesel engine....

Quote:
Originally Posted by Rhapsody-NS27 View Post
The cooling system was described in the video at 7:34 when the words "Bomba de refrigeracion" came on the screen for the cooling pump until 7:47 for the coolant "Enfriador de agua dulce".

Looked like it was running pretty good at the end of the video.
It was turning, but didn't look to me like it was - or could be - running as an internal combustion (ie diesel) engine, as described in the OP. No water jackets or cooling fins on the cylinders or heads, and the camshaft drive gears were wrong.

If it's a compressed air motor,(ie. not a diesel) which it appears to be, then it doesn't need a cooling system. That would also explain the camshaft speed being the same as the crankshaft speed, as it would effectively be a two-stroke motor - no compression or expansion stroke.
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