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Old 06-30-2012, 09:06 PM   #1
mhirst121
 
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Default Small Gas Engine

Hello all, while attending the 1000 engine rally here in the UK I came across these castings for a small gas engine. The large parts had been machined and a few items were included with the castings. It is always a risk buying castings that have been machined as to whether they are correct or not, luckily these measure up fine to the drawings.
The engine is not a model but a full size engine. The bore is 61mm and the stroke is 80mm. The flywheel is around 14" in diameter and 2" across the face.
Although it is not a model, It is a Klein gas motor of German manufacture, I thought some of you would like to follow my trials and tribulations in a build log for it.
I will be ran on propane and have hot tube ignition, it has sideshaft driven cams that operate the valves. I may also fit a CDI ignition unit and spark plug so that the engine can be run outside if it is windy.
Let me know if you think a build log would be of use to anyone.
A few pics of the castings below, the vernier in front of them is 6" and should give some idea of the physical size of the engine.
Cheers,
MartinH









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Old 06-30-2012, 09:23 PM   #2
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Default Re: Small Gas Engine

Hi Martin

I have pulled a chair and will follow you on your journey. Hope you do not have any missing castings.

Vince



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Old 06-30-2012, 09:29 PM   #3
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Default Re: Small Gas Engine

Vince what you see in the pictures is all I got, the sideshaft perch brackets and the mains caps will have to be machined or fabricated. Shouldn`t be too much of a problem, the mains caps will be a bit more work as one half is already machined, will have to match the caps up to them.

MartinH

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Old 07-01-2012, 12:29 AM   #4
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Default Re: Small Gas Engine

Martin: Can't wait to see where this leads. I'm sure it will be interesting. Roger

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Old 07-01-2012, 12:49 AM   #5
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Default Re: Small Gas Engine

Any engine built is interesting to me, I will follow you on your venture it looks like a real educational venture to me.

Don

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Old 07-01-2012, 06:31 AM   #6
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Default Re: Small Gas Engine

I'll be watching, always a softie for a gas engine.

It's a pity there is not more metal on the lower bearing housings as you could have made the tops and then bored oversize and bearings to suit, maybe there is still room for a light skim?

J

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Old 07-02-2012, 08:03 PM   #7
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Default Re: Small Gas Engine

Right then, let the fun begin. I like to work from castings, don`t know why I just do, so with this in mind I decided to make the parts I felt should have been in a complete set of castings. With this in mind I thought I would start with the sideshaft perch brackets.

Blocks of steel for brackets


Blocks machined square and to required size


Marked out


Excess cut out on the bandsaw


Step milled to size


Recess for cap machined


Cap block machined to fit main part


Drilled and tapped for screws


Ready for the lathe


Centred in lathe ready to cut first face and bore


First face done and bored to size


cap screw faces machined


Finished cap


Bracket mounting holes drilled and marked out and cut to lines of finished size


Finished brackets


And test fit to the engine





I will tidy them up a little more with a file to make them look a little more like castings. Well thats a start anyway.

Cheers,
MartinH

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Old 07-02-2012, 11:32 PM   #8
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Default Re: Small Gas Engine

Thanks for sharing Martin. Looking forward to next instalment

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Old 07-03-2012, 01:00 AM   #9
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Default Re: Small Gas Engine

Great stuff Martin,

Please keep posting your progress on this neat little engine.
How will it be fired? Hot Tube maybe?

Dave

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Old 07-03-2012, 01:04 AM   #10
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Default Re: Small Gas Engine

Oops, Sorry; I went back and read your original post where you said that it would be hot tube

Dave



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