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Vintage Diesel and Oil Engines Fairbanks Morse, Lister, Petter, Witte and other pump injected Diesel oil engines.

Vintage Diesel and Oil Engines

Homebrew Diesel (Built by Elden DuRand 2018)


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  #11  
Old 02-17-2019, 05:20:23 PM
David Jones David Jones is offline
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Default Re: Homebrew Diesel (Built by Elden DuRand 2018)

Thanks "Doc", I will download and study the manual. It appears that Elden shortened the stroke of the pump from it's original design. As such it dumps (spills) the fuel very early in the stroke. The parts do not appear to have any noticeable wear, if the plunger were to bypass fuel (leak) it would accumulate in the injector pump cam follower. I have not seen any leakage.

Looking at the pump stoke, the 6LD435 originally had a stroke of 9 mm or .354 in. Based on the drawings Elden gave me it show a max stroke of .0065, this is the elevation of the cam lobe. My theory is this limited stroke causes the plunger to spill the fuel prior to reaching a high injection pressure. Thanks again for your input, all ideas appreciated and welcomed.

David L. Jones
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Old 02-17-2019, 05:26:53 PM
David Jones David Jones is offline
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Default Re: Homebrew Diesel (Built by Elden DuRand 2018)

This is wonderful information, was trying to figure out how to accurately determine start of injection. Thanks DOC.
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Old 03-04-2019, 09:49:38 PM
David Jones David Jones is offline
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Default Homebrew Diesel (Built by Elden DuRand 2018)

Adjusted timing trying to figure out the best setting. Using the timing procedure from "DOC's" Lombardini manual, it appears that the Homebrew Diesel prefers 5 to 7 degrees ATDC. Advance it any more and it really hammers and will not produce any power. With the timing close to TDC, ignition comes easily. As I retard the timing I have to assist with heat before it begins to fire. With timing retarded 5 to 7 degrees it does produce power and will accelerate and run against the governor. Once the governor reduces the fuel the engine starts to stall and then the governor takes the fuel setting to max and it recovers only to repeat the cycle again. Elden had added a fuel limit stop and I suspect he was having the same problem. I am waiting for warm weather as I cannot run it in my shop. The smoke gets heavy very quickly. Hope to post a video next time I work on it. Stay tuned.

David L. Jones
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