Author Topic: Small capacity diesel engines  (Read 1720 times)

Offline Neil-Lickfold

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Small capacity diesel engines
« on: January 21, 2019, 10:14:06 PM »
Has anyone made a small capacity diesel,  so less than 0.5 cc that has started and run reliably with a good performance? Just curious , as I don't want to put time into making something and be disappointed with its performance. Any info will be appreciated.

Offline rklopp

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Re: Small capacity diesel engines
« Reply #1 on: January 22, 2019, 05:38:32 AM »
Do you mean a true Diesel with fuel injection, or simply a compression-ignition engine like used in UK model airplanes? If the latter, I built three each Gordon Nano 0.1 cc engines and got all three to run. Define "reliably with a good performance."  ;D I was happy to get them to run at all. They were an extreme challenge to build. I also built a 0.24 cc "Clanford Clan." That one runs reliably and performs well IMHO. It can be hard to get running forward, as it just as often will start backwards despite flicking it forward, or will start to oscillate across BDC instead of turning in one direction. The oscillation happens with excess compression and insufficient flip speed when starting.

If you are talking about a 0.5-cc fuel-injected Diesel, my hat is off to anyone who could pull that off.

Offline Roger B

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Re: Small capacity diesel engines
« Reply #2 on: January 22, 2019, 10:12:42 AM »
I am aware of fuel injected diesels around 5cc and think that I could achieve that. My 20cc engine has an injection quantity of around 0.5 mm3 reducing that to 0.025 mm3 would be a challenge  :thinking: A 1mm plunger with 0.02mm stroke  ::)
Best regards

Roger

Offline Neil-Lickfold

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Re: Small capacity diesel engines
« Reply #3 on: January 22, 2019, 12:47:26 PM »
Im looking for just something compression ignition. No chance Im taking on an injected timed model engine. Wanting one for a small free flight model. I did not want a mills or a mills copy. But if there was a plan for something around the 0.5cc range to 0.8cc range . I guess I could go the mini oliver route. I did not want to go with anything that is current like PAW for instance. Also wanted it to be cast iron piston based instead of ABC or AAC etc.
Neil

Offline steamer

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Re: Small capacity diesel engines
« Reply #4 on: January 22, 2019, 12:48:40 PM »
Didn't Tug just do one that size?

Dave
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Damned ijjit!

Offline Jasonb

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Re: Small capacity diesel engines
« Reply #5 on: January 22, 2019, 12:53:55 PM »
Ramon's are usually 5cc not 0.5cc

Offline Admiral_dk

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Re: Small capacity diesel engines
« Reply #6 on: January 22, 2019, 12:58:30 PM »
This is a succesful design but I remembered the part about it having drawings in the public domain wrong  :-[

http://sceptreflight.net/Model%20Engine%20Tests/Pfeffer%200.6%20RC.html

I'm sure there are others ….

Best wishes

Per

Offline Jasonb

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Re: Small capacity diesel engines
« Reply #7 on: January 22, 2019, 01:04:04 PM »
The Motor Boys Plan book has the ED Baby in it at 0.47cc if you don't mind carving your own crankcase from solid. That is steel liner with CI piston

You may also want to contact Jo to see if Eric has suitable castings for a very small engine, I'm sure he has several options.

Offline Jo

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Re: Small capacity diesel engines
« Reply #8 on: January 22, 2019, 01:40:25 PM »
0.5cc Compression Ignition Engines are very common.

This is a design my friend John Carter did, I have a casting to make one  :)

Jo
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Offline Ramon

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Re: Small capacity diesel engines
« Reply #9 on: January 22, 2019, 01:43:07 PM »
Yes that's right Jason ten times bigger  ;D - I've rebored down to .5cc but not made one Dave

Neil - I have a copy of the plans book mentioned (CD) though I have a feeling it won't allow direct copying.
There is a very nice 1cc diesel - the Weaver/Ransom - that could be slightly reduced and it's easily made from bar stock too. I believe many have been successfully made and are good runners -ideal for free flight. There's also the Deezil 1 (2?)cc side port that you could do the same to.

Not sure but there may be plans on Ron Chernich's Model Engine News site that is still extant

I also think I have  drawings for a .8cc from Model Engineer on file somewhere

I would imagine you can find a copy of the Motor Boys Book 'down there' but if not let me know and I'll see what I can do to help

Tug
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Offline Ramon

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Re: Small capacity diesel engines
« Reply #10 on: January 22, 2019, 02:02:40 PM »
Yep just had a check Neil  :ThumbsUp:

There was a series of articles in Model Engineer by a Richard Gordon on his 'Alpha' .5cc side port diesel.

Unfortunately there's no dates on the pages so don't know when it was featured - in the nineties or a little later perhaps - maybe Jason can help here.

It's a nice little engine with full coverage of the build though you shouldn't need that 'I'd a thought'

Whatever, I have hard copies which I can pass on should you want.

Regards - Tug


Edit - Didn't Chris Boll do a .8cc? the 'Boll-Aero' - or was that 1.8cc
« Last Edit: January 22, 2019, 02:05:46 PM by Ramon »
"I ain't here for the long time but I am here for a good time"
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Offline Jo

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Re: Small capacity diesel engines
« Reply #11 on: January 22, 2019, 02:15:20 PM »
Alpha was one of those centre page pull outs in ME Mag number 4027

Jo
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Offline Ramon

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Re: Small capacity diesel engines
« Reply #12 on: January 22, 2019, 04:12:12 PM »
Thanks Jo  :ThumbsUp:- any idea what year that was?

Tug
"I ain't here for the long time but I am here for a good time"
(a very apt phrase - thanks to a well meaning MEM friend)

Offline Jasonb

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Re: Small capacity diesel engines
« Reply #13 on: January 22, 2019, 04:25:50 PM »
Motor Boys Plan books are now available online

I'd only looked at one book but this first link has quite a few in the size range that may suit you Nick

https://rclibrary.co.uk/title_details.asp?ID=2139

https://rclibrary.co.uk/title_details.asp?ID=2122

I'll look into the ME one but may be before the digital archive started and not one I have a paper version of.
« Last Edit: January 22, 2019, 04:52:18 PM by Jasonb »

Offline Jo

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Re: Small capacity diesel engines
« Reply #14 on: January 22, 2019, 04:30:05 PM »
Thanks Jo  :ThumbsUp:- any idea what year that was?

Tug

Late 1996, the same mag that had Roy Darlington's "Noddy" Marble Hot air Engine  8)

Jo
Usus est optimum magister