Author Topic: Another shop project  (Read 3708 times)

BruceM

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Re: Another shop project
« Reply #30 on: January 20, 2019, 05:04:36 PM »
38AC's projects are a joy to follow and learn from, and this one is a beauty!  I didn't realize that hot bulb (surface ignition) was largely a Diesel patent infringement dodge.  It kinda looks like a variation on indirect injection. 
 
What a great project!




 

ajaffa1

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Re: Another shop project
« Reply #31 on: January 20, 2019, 10:54:00 PM »
Hi Bruce, a quick search on the internet tells me that Ruston Hornsby  was formed by merging two companies, the Ruston side of things had been building oil engines eight years before Rudolf Diesel built his first production diesel engine.

Stef, loved the rant, almost as long winded as Glort. You could have just told me I`m a f*cking dinosaur and to get a grip!  :laugh:

Glort, not looking for an apprentice just now, but I`ll keep you in mind. Suddenly I have a vision of the sorcerers apprentice with all those buckets of water! I need to take my tablets.

Butch, keep up the very impressive work.

Bob

BruceM

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Re: Another shop project
« Reply #32 on: January 21, 2019, 12:53:24 AM »
You're right, Bob.  The Ruston Hornsby hot bulb oil engines did predate Rudolf Diesel's work.  There's an interesting article on hot bulb engines on Wikipedia.  They were very low compression if that article is to be believed- it says 3:1 to 5:1 compression for hot bulb engines.  It mentions the spark ignition on gas started variation like 38ac's also.

Operational issues are mentioned- like the unavoidable timing advance due to heavy load countered by water drip into intake.

38ac

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Re: Another shop project
« Reply #33 on: January 21, 2019, 01:09:32 AM »
 :)A
« Last Edit: August 31, 2019, 01:20:13 PM by 38ac »
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ajaffa1

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Re: Another shop project
« Reply #34 on: January 21, 2019, 10:27:20 PM »
Well done Butch, quality work as always. It amazes me that every part of that engine would have had to be machined in house, hundreds, possibly thousands of hours of machining by skilled men. No CNC machines back then, no tungsten carbide tooling either. If we tried to build a new one nowadays, using their technology, the wages alone would run into hundreds of thousands of dollars. That`s why these old relics from a bygone era are priceless and I thank you for saving them and sharing them with us.

Bob

BruceM

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Re: Another shop project
« Reply #35 on: January 21, 2019, 11:31:38 PM »
I did read of the patent slug fest between Stewart and Diesel whose later patent in 1898 did precede his working engine by several years. Diesel's fuel efficiency was more than double the hot tube ignition, which was limited to very low speeds due to pre-ignition and slow/irregular burn.


38ac

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Re: Another shop project
« Reply #36 on: January 23, 2019, 12:30:13 AM »
D
« Last Edit: August 31, 2019, 01:20:28 PM by 38ac »
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BruceM

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Re: Another shop project
« Reply #37 on: January 23, 2019, 12:41:35 AM »
Fabulous lack of corrosion in a 100+ yr old engine.  Since it's hot bulb is this a low pressure injector just to meter fuel into the bulb? 

38ac

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Re: Another shop project
« Reply #38 on: January 23, 2019, 12:42:21 AM »
D
« Last Edit: August 31, 2019, 01:20:41 PM by 38ac »
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38ac

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Re: Another shop project
« Reply #39 on: January 23, 2019, 12:53:37 AM »
X
« Last Edit: August 31, 2019, 01:20:54 PM by 38ac »
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38ac

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Re: Another shop project
« Reply #40 on: January 23, 2019, 12:59:38 AM »
Bruce my hot bulb Petter engines run about 300PSI injection pressure. I am not sure on the Ruston? probably in that range. Some details about delivery coming when I get into the pump.
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BruceM

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Re: Another shop project
« Reply #41 on: January 23, 2019, 01:13:30 AM »
I didn't grok the size of the head gasket until your last photo with your feet next to the gasket.  It's HUGE.  No wonder the head weighs 350 lbs! 

38ac

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Re: Another shop project
« Reply #42 on: January 23, 2019, 01:27:05 AM »
AND I have big feet too!😀
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glort

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Re: Another shop project
« Reply #43 on: January 23, 2019, 02:18:32 AM »

I also didn't realise the size of things till that last scaled pic.
That sure is a lot of engine for 10 hp!

You could upgrade the pressure of the IP with a common car power steer pump. I belive they do 1000  PSi plus.

38ac

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Re: Another shop project
« Reply #44 on: January 25, 2019, 01:07:45 AM »
Z
« Last Edit: August 31, 2019, 01:21:10 PM by 38ac »
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