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Fuel injection systems

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Roger B:
And a little bit more. I found the article your drawing came from along with a translation on the RC groups forum:

Thank you to JMP_blackfoot  :ThumbsUp:  :ThumbsUp:

Ian S C:
Twenty or so years ago i made a new injector piston for a Lanz Bulldog, can't remember the actual size, but near an inch diameter, the stroke is only a few thou. Other than the Lanz, the only fuel injection system I'v had anything to do with is that used by Continental on their aircraft engines,ie., the IO 470 etc. this system is a constant flow directed directly behind the intake valve, probably not the most economical method, but it's simple, and it works, and at a low pressure.
Oops, forgot there is also the Ruston Hornsby HR 6 at the museum.
Ian S C

Graham Meek:
Hi Roger,

Thank you for finding out so much information on this engine, as well as the translation. I honestly did not expect to find any more information, given the date I am surprised the information has survived at all, especially as this developement was going on before and during WWII.

My best regards

Roger B:
Hi Gray,

The search required some lateral thinking as well as using German  ::)

The stated injection pressure seems very high, especially as the article suggests that an open nozzle was used. The fuel metering looks to be using the inlet valve as a spill valve (like in Lohring's picture) but part of the mechanism is not illustrated. It's always encouraging to know that someone has made it work before.

I also have a copy of Maschinen in Modelbau in the attic in England that has some details of a 7cc true diesel based on a Deutz horizontal prototype. I must dig that out next time I go back.

Roger B:
A few more tries at making bits. I made a new bracket for the grinder. Its only two bits from the offcuts drawer with a few holes but I managed to get both wrong the first time  :facepalm:

I then tried to improve the finish from the grinding operation with the following variables: Lathe at 2000rpm or 250rpm, grinder at 5000rpm or 25000rpm, aluminium oxide or silicon carbide grinding wheel, grinding with or against the workpiece direction.

None of the results were very good, but the best so far was both at low speed, aluminium oxide wheel and grinding with the workpiece. I need to get some sort of microscope to really see what is going on  ::)

Next I wanted to make some filing/polishing guides for the D bit. They were to be 8mm silver steel with a 1.5mm hole down the middle, a flat milled on the end to just over half diameter and hardened. On the first attempts the drill wandered way off the centre line  :headscratch: I then tried a brand new, hopefully good quality, drill which seemed to improve things. Yet more to learn  :headscratch:


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