Al, no I do not measure before and after; its 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
Im 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