I look at it this way, I have R1 setup, when I did my setup I notice the the line comes out from the engine into the right side oil cooler then into the left side then it goes into the engine, with that setup the oil from the right side oil cooler is already hot then get to go into the left side oil cooler, with paraellel each cool indepenent u can one thero or 2 depend on how u can configure it, I been waiting to have the extra cash to buy the mocals or fluidyne from summit racing. I have no test saying it's better I just find that it's cool the oil much better.
Khris
Khris

Your post made zero sense. In a series configuration, the hot oil is cooled by the first cooler and then is further cooled by the second cooler. In a parallel setup, the hot oil is cooled ONCE and then goes back into the engine. I fail to see how the parallel setup will result in cooler temps.

And the pressure drop myth is just that. The parallel configuration is also more difficult to route through the engine bay and is more complicated.

I honestly have no idea why anyone would choose parallel over serial.

Definitely agree there. Pretty difficult to decipher, really.
It's the same old bullsh*t of guys looking at race car setups and thinking that you can just blindly apply the same theory to street-going cars. Heat transfer is greater when the temperature difference between mediums is greater, but racing machines can make full use of this heat transfer equation with a parallel setup because they have the ability to run huge oil coolers with the combined surface area of a barn door, in addition to gobs of unimpeded and high-velocity airflow. A street-driven car doesn't have any of those luxuries, so you want to keep oil temps as low as possible given the restrictions of the driving environment. Running in series allows the oil to bleed off as much heat as possible before re-entering the engine, plus you won't have to install another thermostat (which you WILL need on street-driven car, unless you like sitting for 10 minutes warming up your oil to proper temps before driving every morning) along with all the other complications associated with trying to adapt a parallel setup to a street-equipped FD.

Lower temperature oil arrives at the second cooler in a series setup. The lower delta-T to the ambient air means that the second cooler dumps less heat than it would in a parallel configuration.

But I completely agree that series is cleaner and appropriate for our cars. The R models came from the factory that way, so a DIY loop won't cause problems just because it's plumbed in series.

Well, today was NOT a productive day and I am highly frustrated :wallbash:

Turns out that the FC front end is very different to the FD, there is basically no space for side mounted oil coolers; at least not for a decent size one (without having to cut any of the body metal), like a mocal 19 row cooler (much less for the 11X11X1.5 B&M).

So I am back to square one, with my original dual FC oil cooler idea; does anybody wants a brand new MOCAL 180F thermostat?

:icon_no2: :pat:

Thanks for EVERYTHIG guys :icon_tup: