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Australian diesel loco in 5 gauge.

Working scale model of the type of loco used for shunting in Queensland.

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Four stroke Fred28/07/2020 09:31:22
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129 forum posts
134 photos

This is a scratch built model scaled up from works drawings, photographs and sketches. It is powered by a home designed and made three cylinder water cooled petrol engine with side valves and cross flow head. The gearbox has two forward and one reverse gear. The engine is equipped with a gear oil pump, a petrol pump, water pump and fan and Hall effect ignition system. The cab is fully detailed and there is a full interior and exterior lighting system and a workING electric fan in the cab ( there was no air conditioning on the full size loco.

Four stroke Fred28/07/2020 09:34:09
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129 forum posts
134 photos

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Hopper28/07/2020 10:37:14
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4804 forum posts
105 photos

Nice work there. I bet it sounds good too. Triples always do. Cross flow side valve is a bit different but would seem to simplify porting im guessing?

Roger B28/07/2020 10:44:38
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107 forum posts
43 photos

Excellent, One of the rather rare IC locomotives powered by a home built engine.

I.M. OUTAHERE28/07/2020 10:47:32
1468 forum posts
3 photos

That looks fantastic !
How long did it take to build ?

I am curious as to the carby design - is it butterfly or slide control ?
Am i correct in thinking that have seen a picture of this loco in AME - colour looks familiar !

Perko728/07/2020 11:57:24
351 forum posts
24 photos

Fantastic work, really well executed. I particularly like that you have maintained the correct scale proportions of the loco body and associated fittings. Can I ask what you used for the final drive to the axles? Also it seems like it might be a bit light for good traction, have you needed to add any ballast?

I am making a Qld Railways DL Class 2-6-0 diesel but don't have the skill to make my own engine so have used a 25cc Stihl brushcutter engine. Had to make a new inlet and exhaust so it would fit inside the engine compartment. Uses a tumbler reverse for forward/reverse and an angle grinder head for the final drive. Some photos in my album but still lots more work to do adding the finer details. Currently making handrail knobs but slow progress as we are moving house so most of the workshop is currently in storage sad.

Howard Lewis28/07/2020 21:24:24
3605 forum posts
2 photos

A really super job, overall! Fantastic!

But am intrigued by the choice of cross flow side valve configuration for the engine. Is the compression ratio low?

I was always led to believe that the change to non cross flow side valves was because of the tendency for cross flow (T head ) to have pockets of end gas that promoted knocking, when compression ratios were increased to obtain more power

Howard.

Simon Collier28/07/2020 21:32:35
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364 forum posts
56 photos

A truely impressive model. I am often underwealmed by diesel models with electric motors and battery, but to design and make the engine yourself for a highly detailed model is quite something. I hope I can look forward to a write up in AME and a front cover picture.

Four stroke Fred29/07/2020 10:42:44
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129 forum posts
134 photos

Thanks for all those who have shown interest in this project. A little more information on aspects of the loco. All wheels are driven and 1:1 bevel gears are used to transmit the power to the four axles. Also all wheels have compensated braking.The engine shown is actually the second engine that I Have built for this model with first being an 80cc OHC four cylinder unit but felt that this was perhaps to “ sporty”. I wanted an engine that would produce power at low revs and fit with in the out line of the body. I am not interested in building a detailed model to pull masses of people - just the driver will be sufficient. The cross flow head does not have an efficient combustion chamber but this engine is 150cc and even being inefficient should produce enough power. The cross flow arrangement allows the carburettor to be on one side and exhaust on the other and the engine to remain on the centre line of the loco. I did use this type of engine on the model Saunderson and Mills tractor and was pleased with the results. I do still have some work to complete on the loco and engine and hope to have that completed soon. If I can find a photo of the other engine I will post it.

Four stroke Fred29/07/2020 10:56:41
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129 forum posts
134 photos

dd641136-4a89-4133-bda6-ac2d11ea4624.jpegb3089caa-92e0-442d-9644-fd148cdd866f.jpeg5f2b763e-c456-4869-a64b-742799054dae.jpeg

Four stroke Fred29/07/2020 10:59:22
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129 forum posts
134 photos

I could not find the photo of the OHC engine but have included extra photographs of the 3 cylinder engine and crankshaft. The later “ carved” out of a billet of 4140 steel. The other photo shows some of the detail in the bogies.

Howard Lewis29/07/2020 13:23:32
3605 forum posts
2 photos

Superb work, and the design work that preceded cutting metal.

You have good reason to be proud of your work

Howard

Hopper30/07/2020 00:19:16
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4804 forum posts
105 photos

Cool stuff indeed. I have a soft spot for side valve engines due to vintage Harleys I mess about with. Never seen one with valve cutouts in the top of the piston though! Borrowed from an OHV motorbike engine?

Looks like she should have plenty of low rev torque at 150cc.

Edited By Hopper on 30/07/2020 00:19:42

Edited By Hopper on 30/07/2020 00:20:07

Four stroke Fred30/07/2020 09:03:45
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129 forum posts
134 photos

Good Day Hooper,

Thanks for the comments. You were correct in relation to the pistons. I bought them at a Cheltenham (UK) swap meet when I was on holiday in the area and was told that they were Honda 50cc of the 1960s. I couldn’t resist them as they were for sale at £5 each or all 4 for £15 and that was complete with rings and pins. I didn’t know what I was going to use them for and later found out they were all different sizes ( for rebores)! The cut outs on the pistons match up with the gas flow from and to the valves. The engine just of “grew” around them!

Hopper30/07/2020 09:18:19
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4804 forum posts
105 photos

Good stuff. Sometimes you just know something will come in handy one day.

Hopper30/07/2020 09:18:30
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4804 forum posts
105 photos

Good stuff. Sometimes you just know something will come in handy one day.

Ron Laden30/07/2020 10:02:36
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2003 forum posts
398 photos

Very impressive Fred not only in designing/scratch building the loco but to do the same and design and build an engine for it is even more so.

Its obvious from the pictures the level of thought, design and quality of engineering that has gone in to it you should be very very proud of it, excellent it really is.

Would you be so kind and post some video of it when you take it to the track, would love to see and hear it running.

Ron

Paul Kemp30/07/2020 22:00:03
559 forum posts
18 photos

Love it, very nice work.

Paul.

Ady131/07/2020 00:52:27
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3859 forum posts
522 photos

wow

Four stroke Fred31/07/2020 04:07:23
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129 forum posts
134 photos

3320a355-6285-4b44-910d-28320632da67.jpegI have managed to find a couple of photographs of the 4 cylinder engine . Excuse the quality but I had to photograph the computer screen onto the iPad but it gives you some idea of the finished product. The engine was built in 1997!

35adb523-c5cc-4f99-8bff-5454b16cd499.jpeg

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