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I am currently working several projects, but one in particular, the engine currently is a wet sump, but for various reasons I am flipping it over so will likely go to a dry sump. In that case, I would ensure that I had at least the same volume as before, but it exposes an area of ignorance for...

Small air cooled aircraft engine specifically. I am sure that I could arrive at an answer empirically just by looking at what else has worked, but am now interested in the topic more generally. Charles

Anybody here know of a good reference on sump design? Specifically determining the optimal size of a sump? Effect of baffling? I have scanned most of the sources I have ready to hand and can't find any coverage. I know there is some minimal cooling effect, but since the surface area rises as...

tbuelna, I think there were a couple of I beam master rods used on radials, but in general, no one sorted out how to do the transition required for the slave rods ( which were invariably I beams). I believe Liston, Taylor and Ricardo discuss this engineering dilemma in some detail. It is...

A solid exhaust valve has a considerable temperature gradient. It is coolest at the tip of the stem and hottest at the center of the face. For a non sodium valve, I think you will find that 75% or more of the heat flows through the valve face and less than 25% percent flows through the stem...

I am pretty sure most WWII aircraft ran sodium valve stems. The exhaust valve has always been the TBO limiting factor for aircooled aircraft engines. For a flying VW you will probably find yourself doing a top end overhaul at least every 200 hours. The WWII era radials also had regular top...

Pat, conscientious builders/mechanics are less likely to burn a valve on a VW. Typically the valve gets overheated and the stem stretches if you run them at high output levels for extended periods(like the flying VWs). You compensate the next time you adjust the valves. Eventually you replace...

tbuelna, Why did your team chose to run the pistons out of phase rather than move the ports, or alter their shape. Seems the balance issue would be a big penalty to pay. Is it normal for opposed piston engines to run their pistons out of phase? Charles

Greg's numbers look in line with what I have read elsewhere. I have the GM Automotive Test Code for 1967. It specifies a two hundred hour durability test. The GM test code requires the engine to complete a 200 hour test schedule "without major failure". The engine is cycled between peak...

Thanks, that is what I thought. I mistyped but meant ASME. Regarding the pointer to the FAQ, did I commit some faux pas? Thanks

I am fairly familiar with the AN standards for bolts, but am less familiar with the SAE standards beyond the tensile strength and material specs that make up the grading system. Does the SAE standard specify tolerances, bearing area, grip length etc? Or is that in another standard SAE...