Plumbing in parallel will have lower pressure drop; and likely some advantage in heat rejection because of higher average rejection temp.  

 

Rotary engines have a high oil flow.  Twelve ft of -8 line and two coolers in series could have quite a high pressure drop starting up on a cold morning.  But once things are warmed up, should be OK.  Personally, I’d opt for at least -10 line.

 

FWIW,

 

Al

 

-------------- Original message --------------
From: BMears9413@aol.com

I'm running two oil coolers in the Spitfire. Due to the lengthe of the lines and volume of the two coolers I reduced my oil lines to AN8 (I think stock they were 10?) Now, before I close everything up I'm having second guessing. My total line length will be around 12'. I had planned on running the lines to one oil cooler, then the other, then back to the motor.

Any comments?

 

Bob Mears