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  1. xlch58

    Sources for optimally sizing a sump

    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...
  2. xlch58

    Sources for optimally sizing a sump

    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
  3. xlch58

    Sources for optimally sizing a sump

    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...
  4. xlch58

    A question about connecting rods

    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...
  5. xlch58

    Open Header = Burnt Exhaust Valves? Myth?

    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...
  6. xlch58

    Open Header = Burnt Exhaust Valves? Myth?

    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...
  7. xlch58

    Open Header = Burnt Exhaust Valves? Myth?

    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...
  8. xlch58

    Peak Cylinder Pressures

    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
  9. xlch58

    Durability Targets

    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...
  10. xlch58

    SAE J429 Spec

    Thanks, that is what I thought. I mistyped but meant ASME. Regarding the pointer to the FAQ, did I commit some faux pas? Thanks
  11. xlch58

    SAE J429 Spec

    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...

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