Today's Message Index:
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1. 05:33 AM - Re: 912 over heating (frank goodnight)
2. 08:53 AM - Re: 912 over heating (Cannon, Walt)
3. 09:45 AM - Re: 912 over heating (John Marzulli)
Message 1
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| Subject: | Re: 912 over heating |
________________________________
From: John Marzulli <john.marzulli@gmail.com>
Sent: Sat, December 15, 2012 11:06:14 PM
Subject: Re: Zenith701801-List: 912 over heating
What cowling are you using? Do you have enough of the radiator exposed? Any
pictures you can share?
With the newer style 701 cowling my plane suffers from low oil & CHTs this time
of year. The entire radiator and oil cooler are covered in aluminum tape.
John Marzulli
http://MarzulliPhoto.net/
http://701Builder.blogspot.com/
Hi John,
Thanks for your reply.
Don't know for sure what cowling I have got . I bought it from Zenith in
September,
told them it was for a 912 bed mount. The radiator and oil cooler are the ones
that came off
the Titan the oil cooler is piggy backed on the radiator , Flew that way on the
titan for over
800 hrs. But the engine was exposed --un cowled in that app.
The coolers are about 1 inch behind the prop, and the top is about 2 inches
below the
shaft. right in the center of the hole in the cowing. Can't send pictures today,
possibly
later .--Have to get a friend to do it for me.
Thanks for any thoughts you --or anyone else may have.
Frank
On Sat, Dec 15, 2012 at 4:44 PM, frank goodnight <frank.goodnight@att.net>
wrote:
>Hello 701 builders and flyers'
>Just finished my 701 , about a hour and a half
>flight time.
> Have a problem with overheating --912 ULS--
>that came off a Titan Tornado.Engine is in good shape 800 hrs.
>When trying to fly around the pattern the CHT will
>trend towards overheat about, half way around I aborted at 270 F , the oil
temp
>also looks like it would over temp--250 F and going up
>After landing the temps continue to go up as I tried to idle
>and cool down. Removed the cowling and flew at various
>power settings and speeds for about an hour.All temps are normal--
>oil @235F--CHT@around 200F.
> Another 912 uls user told me that when he first started up he had a over heat
>problem that was caused by a air bubble trapped in the
>water circuit that worked itself out over time.
> I would like to hear from any one that has had similar
>problem. Or know what might be causing it , and best of all the cure.ThanksFrank
>Goodnight
>Fayetteville Arkansas
>Kolb Firestar--HKS engine 200+ hrs.
>Zenith 701-- 912 ULS engine 1+ hrs
>
>
>
>
>
>
Message 2
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| Subject: | Re: 912 over heating |
Frank,
I had a overheat problem on my 2003 era CH701 / 912S when I first started flying.
It turns out that I had plenty of radiator and oil cooler exposed on the inlet
side, but not enough cowl air exhaust opening to let the air our the bottom.
I trimmed the opening larger around the muffler area and the increased flow
dropped the temps drastically.
Walt Cannon
Seattle
Message 3
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| Subject: | Re: 912 over heating |
If it is the "bed mount" than you have the older style cowling.
John Marzulli
http://MarzulliPhoto.net/
http://701Builder.blogspot.com/
On Sun, Dec 16, 2012 at 8:54 AM, Cannon, Walt <walt.cannon@boeing.com>wrote:
> walt.cannon@boeing.com>
>
> Frank,
>
> I had a overheat problem on my 2003 era CH701 / 912S when I first started
> flying. It turns out that I had plenty of radiator and oil cooler exposed
> on the inlet side, but not enough cowl air exhaust opening to let the air
> our the bottom. I trimmed the opening larger around the muffler area and
> the increased flow dropped the temps drastically.
>
> Walt Cannon
> Seattle
>
>
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