I've been waiting for summer weather before finalizing the cooling exit ducts. Today it was 90 degrees on deck departing from a 5,000' MSL airport. At full power and 80 mph I got up to 419 degrees on the CHT and 215 degrees oil temperature. I then accelerated to 100 mph (still climbing at full power) and dropped about 10 degrees. Then I pulled the RPM back to 3200 (still climbing at 100 mph) and the CHT dropped below 400.
The engine is a Revmaster 2100-D running 8.5:1 CR. My cooling configuration is....well...different. I have stock VW cooling shrouds which draw the air up through the cylinders and heads then port it directly overboard via exit ducts on top of the cowl. I'm trying to decide if the ducts are large enough or if I should expect better cooling and need to enlarge them some.
Your experiences are invited. Thanks,
Chucker
The engine is a Revmaster 2100-D running 8.5:1 CR. My cooling configuration is....well...different. I have stock VW cooling shrouds which draw the air up through the cylinders and heads then port it directly overboard via exit ducts on top of the cowl. I'm trying to decide if the ducts are large enough or if I should expect better cooling and need to enlarge them some.
Your experiences are invited. Thanks,
Chucker