Joseph M Berki wrote:

Thanks Paul,
        Did the car use 2 coolers?

Joe

Yes the 3rd gen used two coolers in the manual TX version. The RX8
also uses
two coolers in the 250 HP version. The 200 HP auto transmission
version of the RX8 uses only one.

Only the R1 and R2 3rd gens had two oil coolers, but all of them

should

have them.

That car had very marginal cooling period.

Hans

-Joseph Berki wrote:

It appears that the 3rd gen oil cooler has the same volume as the 2nd

gen

but the 2nd gen works in A/C applications and if you use the 3rd gen

you

will need two?

Joe-

Lets see... 2nd gen is about 19 by 5 by 3 = 285 cubic inches roughly.
3rd gen is about  10 by 8 by 3 is 240 cubic inches roughly.

Well the third gen engine is up to 280 HP in the Japan spec and 250 HP

in the

US spec. The 2nd gen Turbo II engine never made more than about 205 HP.

There could be a difference internally making the 3rd gen oil cooler

less effective.

Turbulators inside the oil tubes for example.
Probably a cheaper cooler than the 2nd gen from the looks of it.

Note that Perry found a big difference in effectiveness for Mazda oil
coolers of similar size. Early verses late.


Paul Lamar

The 2nd gen coolers are 2" thick. Don't know about the 3rd gen. I don't
think anyone has flown with 3rd gen oil coolers yet, probably because
they are rather rare. They definitely have a better form factor.

--
Perry Mick
http://www.ductedfan.com

The first thing you want to do is check the oil thermostat located
in the cooler by boiling it in oil. I recently ran across a failed
oil cooler thermostat. Much work was done over a long period of time
trying to figure out why the oil did not cool.

You can take the thermostat out of the oil cooler if you plug this
bypass hole with a pipe plug. We discussed  this years ago but there
are a lot of new guys on here.

Paul Lamar

Paul, that was not the cause of my oil cooling problems. The oil thermostat
was working fine in the cooler that was on my plane, I can tell because the
oil temp drops to 150F and sits there during descent. With the thermostat
removed and the bypass plugged, the oil temp will drop below 150F during
descent. I also tried that at one time.

The thermostat may have been bad in the cooler I sent you, that was one
sitting around in my hangar for the last two years.

Perry

OK. Sorry for the mix up. I thought I was on to something.
I'll use that one on the dyno engine without the thermostat as the 
fittings are perfect.

Paul Lamar
 
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