Author Topic: Another shop project  (Read 2317 times)

38ac

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Another shop project
« on: January 13, 2019, 02:46:07 AM »
Still trying to get the new tablet figured out.
Another shop project, Ruston Hornsby class M size 4  hot bulb engine. 17HP.  This one starts and runs on gasoline until the hot bulb is warmed up then you switch it over to fuel oil and kill the magneto.  To give size to it that is an 8 inch bore and 16 inch stroke. I cannot lift the piston and rod  by myself. This engine was sold new in Winnepeg and powered a prairie grain elevator.  This is one of my personal  treasures.

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BruceM

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Re: Another shop project
« Reply #1 on: January 13, 2019, 02:58:06 AM »
Awesome engine project, Butch.  Can't wait to see more. 

38ac

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Re: Another shop project
« Reply #2 on: January 15, 2019, 12:19:37 PM »
Hopefully the picture sizing is now fixed.  Working on the Ruston. Everything is large and heavy. Piston and rod installed. Took all day to fit the bearing as some "mechanic" had beat the snot out of the rod cap for reasons I will never know.  The 3/4 drive ratchet and my gloves give some scale to the size of things. That is a 4" crank pin

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saba

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Re: Another shop project
« Reply #3 on: January 15, 2019, 12:26:10 PM »
Nice project, just had a quick look on youtube,

https://www.youtube.com/watch?v=l1fd_cIVJ6A

That should be it I guess.

Bernhard

dieselspanner

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Re: Another shop project
« Reply #4 on: January 16, 2019, 07:55:18 AM »
That's a job to envy, Butch!

Cheers
Stef
Tighten 'til it strips, weld nut to chassis, peen stud, adjust with angle grinder.

LowGear

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Re: Another shop project
« Reply #5 on: January 16, 2019, 11:02:54 PM »
Wow!
NPR Tipper/Dump Truck
Kubota BX 2230
Witte BD Generator
SunnyBoy 6000 + SolarWorld 245

BruceM

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Re: Another shop project
« Reply #6 on: January 17, 2019, 12:44:38 AM »
Does it start (with gas fuel) on a flame to heat the hot bulb?  I'd love to see the hot bulb details as you get there, Butch.  Hot bulb has always intrigued me. Thanks for sharing your project photos!

38ac

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Re: Another shop project
« Reply #7 on: January 17, 2019, 02:56:16 AM »
No Bruce it actually starts just like a gasoline engine spark ignition via  magneto. This heats the hot bulb and when warmed up you turn on the fuel oil injection and kill the magneto as it is  not needed.The carburetor is a piece of engineering, I will post some pictures later. I was told that the flameless heating of the hot bulb was required due to the I installation in a grain elevator.
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BruceM

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Re: Another shop project
« Reply #8 on: January 17, 2019, 05:31:51 AM »
Amazing engineering.  Is the hot bulb because it's too low compression to run on diesel otherwise, or is the compression changed after the fuel switchover and the hot bulb is just for transition?

Mark Cherry's smartplugs- smartplugs.com are essentially a platinum catalyst assisted hot bulb. He did also apply a bit of current to the platinum wire to advance ignition timing when/if needed. 

It's interesting how old ICE tech gets recycled as new tech.

mikenash

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Re: Another shop project
« Reply #9 on: January 17, 2019, 05:48:32 AM »
Am I right in thinking that hot-bulb technology was in place before diesel cold-start compression/combustion chambers were properly understood?

ajaffa1

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Re: Another shop project
« Reply #10 on: January 17, 2019, 09:33:37 AM »
Hi Butch, I`m already enjoying this new rebuild and you have only just started. Please post stuff about the governor mechanism and fuel injection set up. Where are you finding spares for an engine this old? I guess you will have to make a lot of it yourself. Can`t wait to see the finished product.

Bob

38ac

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Re: Another shop project
« Reply #11 on: January 17, 2019, 11:30:33 AM »
Hot bulb engines are very low compression and use what is called surface ignition. The fuel is injected into the hot bulb as the piston is coming up on compression but does not ignite until the the chamber pressure reaches a given point. Diesel's patents covered ignition at the time of fuel injection and the process cleverly circumvented his patents and royalties payable to him. When the patent rights expired so did not bulb ignition for the most part.
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38ac

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Re: Another shop project
« Reply #12 on: January 17, 2019, 11:34:41 AM »
Spare parts are mostly non existent other than things like rings and magneto parts that are not specific to this engine. What ever is broken or worn requires a trip to the steel rack followed by a few hours working the machine tools.
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BruceM

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Re: Another shop project
« Reply #13 on: January 17, 2019, 05:22:25 PM »
Thanks, 38ac.  I suspected they were fixed low compression.  No penalty for that at 300 rpm, plenty of time for fuel burn, and the hot bulb solves the ignition at low compression issue.

A most interesting and very challenging engine restoration project! 
 

38ac

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Re: Another shop project
« Reply #14 on: January 18, 2019, 01:32:18 PM »
A few more pictures of the Ruston innards.
The piston side of 350 lbs of cylinder head. The hole leads to the hot bulb


And the hot bulb side
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