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

100 HP. By fuel flow that's about 8.3 GPH. Anywhere from 190 (cruise at 8000') to 200
(climbing).

100 mph straight and level I'm only using 5 - 6 GPH (60 - 70 HP), maybe even less than
5 GPH.

Finn

OK what is your oil temp when cruising at 5 GPH?

Paul Lamar

I was wrong. 100 mph at 5000' fuel flow is less than 4 GPH, leaned, so maybe 50 HP. Didn't
pay much attention to oil temp, but think 170 - 190 F.

Finn

 
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