Jeff,
I was looking at the photo in your May 8th message concerning PSRU oil return. The blue Push-Lok hose is shown connecting the oil pump outlet to the bottom of the Fluidyne oil cooler on the right side. Most of the air outlet of this oil cooler appears
to be captured into a hose presumably for cabin heat. Is this the case for the Mazda oil cooler now in this location?
The thermostat in the Mazda oil cooler is unlikely to be very effective at maintaining a minimum returned oil temperature with the coolers in series, no matter which order the coolers are plumbed.
I realize that your main concern presently is coolant temperature control, but in the end, everything affects everything else.
Steve Boese
RV6A, 1986 13B NA, RD1A, EC2
From: Rotary motors in aircraft <flyrotary@lancaironline.net> on behalf of Jeff Whaley <flyrotary@lancaironline.net>
Sent: Tuesday, May 19, 2015 6:11 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Return to Flight - 2
Hi Steve, a long time ago I had only one Fluidyne oil cooler and it wasn’t enough, so ended up with two in series – one wasn’t enough yet two is almost too much. I
swapped the right Fluidyne for the Mazda to get temperature control. I would never have guessed about the high pressures you pointed out. Also don’t know if it makes any difference which cooler is first but actually the Mazda oil cooler is connected first
to engine outlet and oil returns through the Fluidyne … hard to see from pictures submitted.
Jeff