Great data, what a treat to capture all that data. I think your correct, the
air is being robbed from #5 cylinder.
Last week I saw John Farmer's SR. He has taken a similar approach to what
your are talking about, but with a opening in the front of the cowl and a
duct to the oil cooler. I'm in the process of doing the same thing and
should have it done in a couple of days. He has also built a fence down the
center top of the engine, added a cowl flap, and fiber glassed the top of
air inlet openings to have curved surface up to the top of the inside of the
cowl. John is on wheels and I forgot what his temperatures were running.
I see some high EGT's, 14:25 to 15:14, what is going on, the climb? Are you
running at LOP or close to peak and what power setting?
I would like to get my summer climb temps to no more 400-405, last summer
most climbs were short bursts, level off to cool , up for another step. It
would be great to trim for 10 minute climb and go for it.
Al
----- Original Message -----
From: <gill.sr25@dcsol.com>
To: <murphy-rebel@dcsol.com>
Sent: Tuesday, February 17, 2004 5:26 PM
Subject: Re: Exhaust system for IO540
S-EngineAl,
I just uploaded an excel spreadsheet and graph of my CHT's from a February
15th flight. Thought you might find this interesting. File is in
pushCategory or under new files.
CHT#5 is higher than I like as this cylinder is right in from of my oil
cooler. The problem is worse in the summer months when I'm on floats.
I plan to try installing a small ducted scoop on the top of the cowl to
fromair through my oil cooler. This should also stop the loss of cooling air
airaround cylinder #5. Right now some of the potential cylinder 5 cooling
asgets diverted through the oil cooler.
The graph shows take off, a short flight to the cabin, temps rise and fall
crise toI do a few descents and climbs at the lake, then temps normalize as I
+0000Skwentna and back to Anchorage.
Chris
On 2/17/2004 2:53 PM, PAXHIA2@COMCAST.NET wrote to MURPHY-REBEL:
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an-> Message-ID: <002501c3f4cc$29fe8e40$6401a8c0@NEWCOMPUTER>
-> From: "Al Paxhia" <paxhia2@comcast.net>
-> To: <murphy-rebel@dcsol.com>
-> References: <1076957897@dcsol.com>
-> Subject: Re: Exhaust system for IO540
-> Date: Mon, 16 Feb 2004 12:33:40 -0800
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-> Chris,
-> The OAT was 35-40 F on that day. Last week went up to Abbotsford, about
20:53:20 -0900-> hour flight, CHT was as high as 370 with the OAT in the high 50's(best
-> weather in a long time). Al
-> ----- Original Message -----
-> From: <gill.sr25@dcsol.com>
-> To: <murphy-rebel@dcsol.com>
-> Sent: Monday, February 16, 2004 10:58 AM
-> Subject: RE: Exhaust system for IO540
->
->
-> > Al,
-> >
-> > What OAT were you operating at when you were seeing the CHT's?
-> >
-> > Chris Gill
-> > SR2500, Anchorage, AK
-> > 907-227-9352
-> >
-> > On 2/16/2004 9:56 AM, PAXHIA2@COMCAST.NET wrote to MURPHY-REBEL:
-> >
-> > -> Received: by dcsol.com (Wildcat! SMTP Router v5.7.450.9b10)
-> > -> for murphy-rebel@dcsol.com; Tue, 10 Feb 2004
05:51:56-> > -> Received: from ([204.127.202.64]) EHLO=sccrmhc13.comcast.net
-> > -> by dcsol.com (Wildcat! SMTP v5.7.450.9b10) with SMTP
-> > -> id 609685812; Tue, 10 Feb 2004 20:53:18 -0900
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-> > [24.19.146.170])
-> > -> by comcast.net (sccrmhc13) with SMTP
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(wsAV)-> +0000
-> > -> Message-ID: <000801c3f063$2bf98ff0$6401a8c0@NEWCOMPUTER>
-> > -> From: "Al Paxhia" <paxhia2@comcast.net>
-> > -> To: <murphy-rebel@dcsol.com>
-> > -> References: <001901c3f048$600619f0$ad05efd1@Thinkpad>
-> > -> Subject: Exhaust system for IO540
-> > -> Date: Tue, 10 Feb 2004 21:52:01 -0800
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exhaust-> > ->
-> > -> I just did 2.5 hours of testing with a new Forsling Aviation
360.-> system.
-> > -> The data looks very good, but I'm not sure I understand it all.
-> > -> Cylinder temps have dropped 30-35 degrees. They range from 326 to
rpm,-> The
-> > -> exhaust temperatures are more balanced. At cruise 23"MP and 2300
when-> full
-> > -> rich now burns 16.4gal/hr this is an increase of .4 gal/hour, but
LOP-> > -> leaning the temps are balanced to a flow of 13 gal/hour. If I go
about-> the
-> > -> flow is even lower and temp are all good. Oil temp was about 190
good-> the
-> > -> same.
-> > -> I've put some pictures out, if your interested.
-> > -> If anyone is interested in the old system its for sale, it's a
*-------------------------------------------------------------------------*-> system
-> > -> if your running a 260 hp, 540. Contact me offline.
-> > -> Al
-> > -> Moose, N526AP, paxhia2@comcast.net
-> > ->
-> > ->
-> >
-> >
-> >
-> >
-> >
->
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-> >
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-> >
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