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From: "Jack Ford" <jackoford@theofficenet.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-320497@logan.com>
Subject: Re: [FlyRotary] Re: New Scoop
Date: Wed, 14 Jul 2004 06:59:24 -0700
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As I understand it, modern automobile engines routinely run with coolant
temps in the 220-230 deg.F. range.
I don't have any data on oil temps, but I think about 240 is max for most
automotive engine lubricants. The boiling point of a 50/50 mix of
water/antifreeze is about 240 deg. F. Add to that the increased pressure in
the system and the boiling point goes up further.
My brother the engine rebuilder sez: "If you didn't lose any coolant, you
didn't hurt it.".
My experience with motorhome operations in the Southwest bears this out.
Used to pull long grades in the Mojave Desert reading 240 deg. on well
calibrated guages without damage. Except to my fingernails. I had calibrated
the guages by immersing their senders in boiling water.
I'm not the last word on this, so I think additional research is
appropriate, but that's my take on it.
FWIW.
Jack Ford

----- Original Message -----
From: "John Slade" <sladerj@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, July 13, 2004 7:57 PM
Subject: [FlyRotary] Re: New Scoop


> > Before that, the temps would climb up, what I think is too high,
> especially the oil.
> That's part of the point. Maybe you're expecting temps to be lower than
they
> need to be. Also - how accurately is you're gauge calibrated? (I
calibrated
> mine with hot wax, but I'm still not sure I really trust it within 10
> degrees or so.) I'm looking forward to getting my EM2, then I'll know
better
> whats going on. So far though, I think I'm within acceptible limits - I'm
> not loosing any coolant and the engine keeps on running :)
>
> > I've been flying only in the mornings when the temperature is
> > <80.  The last
> > flight the coolant was OK (about 200) but in just climbing to
> > 1500' AGL the
> > oil was 220.
> Last time I flew I was getting a stabalized 205/210 in the climb
> (coolant/oil). When I leveled off at 5000 it settled down to 185. At 11000
> it was lower until I opened the throttle, then it stabalized at 185.
>
> > powering back to about 4100 RPM's, the oil dropped to about 210.  OAT
for
> > that flight was right at 80 F.
> I'd be interested to know if others see that as acceptible.
>
> > At level flight, when I add power, the temperatures start climbing.
> OK, but do they stabalize, or didnt you wait long enough?
>
> > After adding the vortex generators the temperatures were definitely
lower
> > oil 220 down from 240, and coolant 200 down from 210-215.  So they did
> > definitely help.
> Yea - 240 oil is too high. Under what conditions were you getting that?
Full
> throttle climb? I havent tried that yet.
>
> > I am curious about what your temperatures are running.  What do you see
in
> > climb ? and what do you see in cruise ?
> Climb - 205/200, 1400 EGT, 100kts, 1000fpm on a 90F day.
> Cruise - 185/190, 1300 EGT, 178kts, 5150 rpm, 38 MAP 11,000 ft.
>
> > I've been looking at
> > 220 oil and 215 coolant as the redline.
> Me too, but I think you could try living within these numbers. You're
really
> not that far off, and dumping heat from the turbo or just throttling back,
> better might be much more efficient than stuffing more air in with scoops,
> just so you can climb faster.
>
> >Maybe I'm wrong.
> Me too. :)
>
> I'd be interested in other perspectives on this one.
> John
>
>
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