Finn Lassen wrote:

Russell Duffy wrote:

each engine is running a 75 kva generator
24/7, and the company that's buying these engines wants a contract to be
supplied with 900 (!!!) more engines.

Specifically, the engines are running at 3600 rpm, under a fairly heavy
load, and I'm not sure if they're turbo charged.

These are interesting numbers. 100 HP at 3600 RPM? I maintain 100 mph at 3600
RPM in my RV-3 which requires less than 100 HP, so they probably are
turbocharged.

If HP is linear with RPM, that's 181 HP at 6,500 RPM - not improbable.

I don't understand/believe the no oil cooler story. 1/3 of 75 kW power (50%
heat, 50% output power, 1/3 of heat rejected via oil, 2/3 via water) is a lot of
BTUs. Maybe they're running in very cold surroundings - still...? I could
understand no fan, but no oil cooler?

Finn

I would not count on it Finn. Perhaps the ceramic coating on the rotors
had a role in reducing the oil temperature. Also they mentioned changing
the internal elastamers which could mean the oil O-rings in the oil scrapers.
They read this newsletter so they could be using 500 degree F Teflon
encapsulated silicone O rings in these locations. 

BTW what is your oil temp when cruising at 100 HP?

Paul Lamar
 
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