Engines > Your Own Design
5 Cylinder radial somewhat based on the Morton but not much
Kim:
Beautiful job, as always, George!
I just love seeing your milled 'castings'. :popcorn: :popcorn:
Kim
petertha:
--- Quote from: gbritnell on March 15, 2024, 12:04:22 AM ---On the original design I had incorporated a feed/scavenge oiling system. It worked but I wasn't happy with it. I went back to the plans I have for the Morton M5 and to see how they fueled it. The carb feeds the crankcase with a gas/oil mixture which is then drawn through the back of the crankcase and out the intake pipes to feed the cylinders. On it's way the mixture lubes all the internals.
--- End quote ---
Nice work, following along!
What specifically about your oil feed/scavenge system were you not happy about? Do you have any old pictures, or can you describe it?
FWIW my Ohrndorf O5 radial lubrication system is similar to what you are describing as an alternative, but with no distribution fan. I can tell you from my initial teardowns that the mist method thoroughly wets & lubricates the internals. However if I didn't swiss cheese the cam plates & front gear plate with aperture holes, I'm not confident I would have sufficient lubrication in the nose case where the cams & lifters & gears really need it. The intake charge has to pass through the congested area largely occupied by master rod assembly, counterweight, bearings etc. on its way forward. I'm also running methanol 4S glow fuel containing 18% oil. I did a build post here on the forum so you can check out the discussion & pics there. I think one of the Saito radials had a distribution fan in the rear. OS had kind of a spiral scroll path backplate to direct flow into intake pipes. My understanding of these systems was more about attempting to equalize delivery gas charge returning from the CC to upper & lower cylinders, as the lower ones ran richer (or probably more critically, the upper ones leaner). I thought I read the current Hodgson radials have a rear mixer vane too vs originals did not. Now that's a bigger engine too, so maybe the increased height difference between upper/lower heads factored into this.
Maybe grass is greener on the other side of the fence but I always thought the Forest Edwards 5-cyl pump system was kind of a practical solution, because it directed oil streams where required & then drained away in a sump chamber for recirculation. Its lobe 'bump' style check valve pump might be a bit easier to implement than a gear pump, but I have no experience with either yet. I recall Edwards called for straight methanol or maybe 5% oil, so lubrication was obviously working. That might be more analogous to a gasoline spark engine? I want to build a bench gear style pump to evaluate, but it was too late to integrate on the O5 anyways. Looks like you have more opportunities to integrate a pump off rear drive shafts. I'm still bit apprehensive about my front idler gear assembly because its not really in the line of mist flow & the axle is even more hidden. I've drilled some lubrication bleed holes between the teeth, similar to all the rod bushings to help get oil into every nook & cranny. Squirting oil seems like a more sure fire way even though its more complicated mechanically. Mist is net simpler. Anyways, look forward to what you come up with.
fumopuc:
Hi George, what a pleasure to follow it.
cnr6400:
:ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn:
Jasonb:
Looking good George, you did post quite a few photos of the previous one starting in this thread
https://www.modelenginemaker.com/index.php/topic,8172.msg237533.html#msg237533
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