Al, no I do not measure “before and after”; it’s measured at block output near standard oil filter pedestal and is feed to PSRU input … see attached (this photo shows the first cooler input, the pressure sender and the return line from second cooler) … if I understand the oil flow correctly, this is after the coolers.
My max oil pressure was 80 psi when I had one cooler and is still max 80 psi with 2 coolers – typical operating pressure is 75 psi at 5500 rpm.
Jeff
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen
Sent: Tuesday, December 15, 2009 2:05 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Oil cooler
Mark, I have two of the DB-30416, single-pass coolers … no measureable pressure drop with 2 in series … I’m seeing 80 psi max with the 13B.
JWW
What do you mean “ . … no measurable pressure drop”? Are you measuring pressure before and after the 2 coolers?
Al G