I use the TRD-1030 dual mount and
two K&N HP3001s for more than 12 GPM at 9,600 RPM. Not
at all needed for lower airplane RPM and much less flow, and very heavy, when
both cans are full of oil
Prior to building up my system I had
data from my friend at the dyno facility showing 16 gpm oil flow at 6000 rpm on
a 13B. My 20B engine on the dyno showed oil flow of 15 gpm at 6000 rpm,
and it was still going up with rpm. This was with 100 psi oil pressure.
I think it important to realize these
high flow rates when chosing your filter setup and your oil cooler, especially
if you are running with higher reduction drive ratios where 6000 rpm and higher
may be routine. Off the shelf coolers are designed for piston engines which
have about half the flow. Get the flow-pressure drop curves from the
manufacturer before deciding.
The stock oil filter block with the very
small filter is plumbed in parallel with the flow bypass to the pressure
regulator valve, so is not a full flow filter setup. Apparently Mazda felt full
flow filtering for automotive use was not important. I installed a dual
filter remote mount and used two K&N
HP3001 filters for full flow
filtering before the cooler. Perhaps a bit of overkill.
I am just now installing an oil/water
exchanger in parallel with the oil/air cooler (also after the filters), and the
configuration is such that the large HP3001s will no longer fit. I’m
going to the HP2004 filter which is about to 1 1/4 inches shorter, but
otherwise the same construction as the HP3001. Too bad, I now have 2 HP3001 filters on
the shelf that have only been run a few hours.
Al
. So, the choice then could be
based on how your oil lines will be run, and where the filter will be mounted
in the cowl. You would want to have the can hanging straight down to avoid
messes when changing. Some place where you can get to it with both hands.
And once you determin where, then
lay out the oil lines with the idea that the bends should be (to the extent
possible) (one of
my favorate Government terms) made using the oil
hose rather than angled fittings.
Observe the minimum bend radius for
your hose. Each drilled 90 degree fitting has the same drag of 3 feet of hose.
So, the filter mount that allows for the best combination is the one you want.
If a 90 degree turn is required as a fitting try to use a tube fitting, where
the bend is actually a 90 degree bend in a metal tube, rather than the
intersection of two drilled holes in a fitting.