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Well, that system seems to work just fine for the Seidel-UMS-Evolution radials. That's why they only need 6-7% oil mix in the methanol. I believe the Moki radials are the same. They run 32:1 mix.
The fuel-air charge in the crankcase is constantly being drawn in, used and replenished, lubricating and especially cooling the engine from within. Wet sump engines rely heavily on the oil to take the heat from the underside of the pistons and other internal components. The oil is actually part of the engine's cooling system.
Our small engines are not lubricated by "blow-by" as such, but by the oil film on the cylinder wall finding its way down into the crankcase because the ring can't scrape the oil off the cylinder wall and keep it just up in the combustion space (Luckily). If there was blow-by, especially on a multi cylinder radial, the gases would be blasting out the crankcase vent. Usually there's just a drop of oil every now and then.
The opinions being posted don't seem to be based on any experience. Exhaust gases in the crankcase? Only if they forgot the rings! Why should they be harder to start? Every 2 stroke takes the fuel mix into the crankcase first, and manages to run ok.
EVO radials are no harder to start than Saito radials. And if you do it right, they will all fire on the first flick... or so. Just like most engines.
Regards, RossG
radial1951
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ORIGINAL: Carosel43
I am not a fan of that concept as you will be taking hot air, probably with some exhuast gasses into the intake. This will not be good for power and it may also make the engine hard to tune as the relative mixture will change with engine temperature. Also the intake of coolair will help cool the cylinder and as a result the engine. On all my 4strokes if i touch the intake pipe when at full power they are cold, and sometimes even covered in moisture or ice (inthe winter) because thepressure drop of the intake stroke has cooledthe air even further.And as pointed out already i think it would make it harder to start. And while my os engines have the crankcase air recycled in the same way as SJN's ASP thats slightly different to having your entire fuel charge in the case.
I do look forward to seeing it run however, it should be interesting to see