The Craftmans Shop > Model Engineering
Side Valve i.c. engine from Bar stock
Brian Rupnow:
Unless somebody can convince me otherwise, I am going to build the crankcase as shown, with no rectangular hole running through it. The hole does nothing in terms of running the engine, and the crankcase becomes so incredibly much easier to machine, since all of the material from inside the crankcase can be removed with a boring tool in the lathe, using the 4 jaw chuck. I am still chasing down "sealed fro life needle roller bearings", but even if I can't find them and have to run an oil sump, this should still work.---Brian
DMIOM:
Brian,
You may not be getting much feedback but I'm sure there are many like me who, whilst never likely to build an engine, are enjoying watching the evolutionary process and appreciating the design skills.
Dave
philf:
--- Quote from: DMIOM on August 11, 2014, 11:21:46 AM ---Brian,
You may not be getting much feedback but I'm sure there are many like me who, whilst never likely to build an engine, are enjoying watching the evolutionary process and appreciating the design skills.
Dave
--- End quote ---
Brian,
I second Dave's comment.
Keep the posts coming.
Phil.
Brian Rupnow:
I went back to Canadian Bearings today and chewed on the salesman for a while about these damned sealed needle bearings. Now it seems that I can get a 1/4" sealed needle bearing x 7/16" long. This will work fine for the wrist pin, because my piston is 1" diameter. I had previously asked for a 3/8" long bearing, and it is NOT available. The 3/8" needle bearing for the con rod big end is only available in an unsealed version, but I can probably find a work-around for that.---One word about needle roller bearings---When I built my Kerzel hit and miss engine, I put a set of needle roller bearings on the crankshaft to make it spin easier. It worked, but they are very noisy little devils. I didn't pack them with grease, just oiled them which may have been a mistake. What I am thinking now is that if I go to the solid crankcase without the rectangular hole all the way through it, the engine might be a lot quieter, in terns of bearing noise.
awemawson:
--- Quote from: Brian Rupnow on August 11, 2014, 12:34:43 PM --- What I am thinking now is that if I go to the solid crankcase without the rectangular hole all the way through it, the engine might be a lot quieter, in terns of bearing noise.
--- End quote ---
It'll still be just as noisy - only you won't hear it :nrocks:
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