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The gage is called a magnehelic gage. You
can find all kinds of them pretty cheaply if you put that word in a search in
Ebay. They come in different ranges. You need to consider what range you are
looking to test before you purchase.
Here is one that has 5.5 hours left on it,
new in the box for currently $10 plus shipping…
http://cgi.ebay.com/ebaymotors/Dwyer-Magnehelic-Pressure-Gage-gauge-2010-NO-RES-/280534237301?cmd=ViewItem&pt=Motors_Automotive_Tools&hash=item415124c075
Bill B
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Don Karich
Sent: Tuesday, July 20, 2010 12:45
PM
To: lml@lancaironline.net
Subject: [LML] Re: My airplane is
running HOT
To check differential
pressure in flight: I got a differential pressure guage from mcmaster-carr and
ran two tubes from the cockpit to a spot just before and just after the oil
cooler. During flight the instrument will read out the pressure difference.
simple
On Tue, Jul 20, 2010 at 4:57 AM, Bryan Wullner <vonjet@gmail.com> wrote:
Thank you guys for all the suggestions.
How would I check the differential pressures in the cowling
inflight?
Craig, the oil cooler I have now is a vans aircraft 7 vane cooler. I
have a feeling its not doing the job needed. I have a stewart warner 9 vane
cooler I will be switching too.
So for now, oil cooler changed, Vernatherm will be checked and
then I will go from there.
On Mon, Jul 19, 2010 at 3:15 AM, Don Karich <donkarich@gmail.com>
wrote:
you could check the
differential pressure before and after the plenum. should be about 5
inches of difference. If this is the case, i'd replace the vernotherm
first. Mine was brand new and i did everything possi ble including adding
a second oil cooler. my temps were 230 and the 2nd oil cooler brought them down
a little but after changing the vernatherm i now have 180 to 205. It
follows amb ient . I have a IO-540 from performance and my vernotherm was new.
On Sun, Jul 18, 2010 at 10:47 AM, Craig Schulze <craig@skybolt.net>
wrote:
Hi Bryan,
I have seen your airplane and I do not think you have an exit
problem. You have plenum from Chris Z, so you are great there. Can
you verify for sure that your probes are all calibrated and reading the proper
temp? And on the subject of fuel flow, my little 320 needs 12.5 gph or
better in the climb and sometimes it will still get hot when its this hot out.
You should be 18 gph on take off and at least 14 on climb. Keep your climb speed
at 150kts or better on these hot days too. What brand oil cooler are you
using? I switched mine to a dual pass Stewart Warner and it made a big
difference. Can you send me a picture of the bottom baffling around
the cylinders? Something could be off there.
Craig Schulze
Check the air pressure in flight above the cylinders and compare it
to the air pressure below the cylinders. You may find that you need to
add a cowl flap. At least you can see how the air is moving thru the cowl
in flight. That will go a long way to solving the problem.
Bill B
Exit area is
standard 360 cowling exit. Can see why it would behave any different than any
other lancair out there. Its actually a pretty good size opening.
On Fri, Jul 16,
2010 at 8:21 PM, <marv@lancair.net>
wrote:
Posted for Bryan
Wullner <vonjet@gmail.com>:
Anybody have any ideas or advice for the following situation:
Lancair 360 with carbed 360 (180hp) engine. 475 hours on it about. Chrome
Cylinders. I have a Plenum cooling system and larger cowling inlets.
(Zavatson's cowling and plenum system)
Oil cooler is mounted at the front inlet.
Oil wont cool in climb and will go up to 230 and probably higher if not
stabilized. CHT's are all hot in climbs and will go to 440 no problem.
Cant
figure it out.
Motor runs great, compression good, boroscoped fine, mag timing
good. All
leaks in plenum or baffling are sealed.
Probes were checked out ok.
Only thing I haven't checked is the vernotherm.
Thanks for any advice.
Bryan
[How big are your cooling air outlets and where are they located? Sounds
like you're getting the cooling air in but not letting it out. Just a
thought. <Marv> ]
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