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Dave
I think you're on to something here. Chris has the coolers in
series but if the oil is cold (and thick), the Mazda cooler thermostat
bypasses the cooler core. The front aircraft cooler doesn't have such a
thing so it takes the full brunt of oil pressure.
Chris
Putting to coolers in parallel will solve the pressure problem but I
doubt you will ever get sufficient flow to the front cooler to make a decent
cabin heater. As Dave says... path of least resistance. Dave may have the
right idea of a second thermal bypass device on the front cooler path. The
second bypass device should probably be mounted close to the engine so as to
bypass the 20' of tubing as well as the aircraft cooler.
NeilK
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Dave
Sent: Monday, October 05, 2009 5:53 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Seepage, no more. Oil system
Chris Barber wrote:
>
> I do know the system was plumbed in series, however, my ignorance
> prevents me from knowing why re-plumbing them in parallel would change
> things. Does plumbing in parallel prevent the front cooler from being
> a restriction point since oil can flow past the front cooler while
> still filling it with hot oil for cabin heating??? Hmm, not sure how I
> would plumb this.
>
Without a temperature bypass or manual shutoff valve placed on the front
cooler oil tubing, you may be re-visiting the current problem - cold
thick oil getting hammered down 22 feet round trip of 1/2" aluminum
tubing through a nose radiator.
Pressure follows the path of least resistance, so if the main mazda
cooler's vernitherm is open, bypassing that cooler, it may be a non-issue.
I have no guarantee that vernitherming the nose cooler (at the firewall,
at the fittings) will not cause the current problem, but I feel
comfortable estimating that it is much less likely.
I'm not even sure theres a way to get a vernitherm off a mazda cooler
without messing it up.
Dave
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