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Found this (Jelbart Brothers Engine)

cobbadog

Registered
Last weekend away I found this sitting out the front of a museum. IT is still there as I have no need for it but it took me a while to realise what make it was.
I found a picture of it in the window out front and they identified it.
It is odd that it breathes from the crankcase or bum like a frog and is possibly why these engines rarely run consistently or at all.
My last comment will create some feed back! :brows: :wave:
 

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eddie bedwell

Registered
Re: Found this

Hi Team,
looks like an early Jelbart Brothers engine.
Supercharged 2 Stroke via a stepped piston.
Mine runs one suck one power stroke--had to do several modifications to get it to Not run like Jelbart's are renowned for.

Main mod was to float valve for even float level--another was a more tapered mixture needle valve end for finer mixture adjustments and the most important one is to run them on a steady load --I always run a water pump with my 10 HP 1918 build engine--people walk by thinking it is a Ronnie by the steady hit/miss running.
I am sure most Jellies would run much better with a water pump attached and not free running, albeit with not so spectacular muffler explosions to attract a crowd--lol.
Cheers,
Eddie B.
 

Inter Bloke

Registered
Re: Found this

Hi Team,
looks like an early Jelbart Brothers engine.
Supercharged 2 Stroke via a stepped piston.

Cheers,
Eddie B.
Yep ! Looks like a Jelbart to me (made in Ballarat Victoria Aust for our US friends) No one can acuse them of copying their design, they are "unique" !
There was one dismantled and in pieces in a pile of scrap at the Denis Spark estate Goomalling clearing sale on Saturday, only time I have seen the piston or conrod of one. I don't know what the heap sold for because I was packing up by then but is sure was interesting to have a look at ! :D
 
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AussieIron

Subscriber
Last Subscription Date
02/04/2020
Re: Found this

Eddie B, you're right about need for a load to run well. Sunshine 2 strokes are the same. No load they sound like a cut cat, but load them up and they sound like a "normal" engine. I guess that's what they were made for, to power something.
 

cobbadog

Registered
Yep Jelbart is what it is. Last year at one of the rallies we saw another model Jelbart running so I took a short video of it. I no sooner started recording than it stopped in its tacks. Typical, I thought. Didn't see or hear it run again over the weekend. When they do run they do sound odd and as suggested must run better under load.
Hopefully the museum that has possession of this can do something positive with it or pass it on to someone who will.
 

Eric Schulz

Registered
Last Subscription Date
09/02/2009
The Jelbart in question is not an early model, just the opposite. The first Jelbart was made in 1909, and that crude oil cylinder head was only patented in 1918.

Jelbarts, like any piece of machinery, have no brains, so they have to be set up by humans. The Jelbart engine is a beautiful piece of machinery. The reason for not starting or running properly is caused by what is commonly known as “operator error”.

Eric
 

AussieIron

Subscriber
Last Subscription Date
02/04/2020
I think you're right Eric. Probably one of those engines that needed the right procedure and maintenance to run correctly. They do seem to run much smoother under load though.
 

Siz

Registered
Spot on Eric , some people don't know how too start them and when help is offered you get a nasty reply and then you wonder why you tried too help the, in the first place .
Cheers
Siz
 

AussieIron

Subscriber
Last Subscription Date
02/04/2020
It would be hard to work these out though without first hand knowledge or a manual. Most of the old blokes who knew about these are gone. As for giving or receiving advise at shows to someone who has spent an hour spinning the handle , with half a dozen people with their own idea on what's wrong standing, watching,--Dangerous territory!
 
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