X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 31 Jan 2011 14:21:53 -0500 Message-ID: X-Original-Return-Path: Received: from imr-da05.mx.aol.com ([205.188.105.147] verified) by logan.com (CommuniGate Pro SMTP 5.4c2a) with ESMTP id 4832544 for lml@lancaironline.net; Mon, 31 Jan 2011 10:13:32 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.105.147; envelope-from=Sky2high@aol.com Received: from imo-ma01.mx.aol.com (imo-ma01.mx.aol.com [64.12.78.136]) by imr-da05.mx.aol.com (8.14.1/8.14.1) with ESMTP id p0VFCjNB012060 for ; Mon, 31 Jan 2011 10:12:45 -0500 Received: from Sky2high@aol.com by imo-ma01.mx.aol.com (mail_out_v42.9.) id q.ebe.5ec1d1a (43907) for ; Mon, 31 Jan 2011 10:12:41 -0500 (EST) Received: from magic-d22.mail.aol.com (magic-d22.mail.aol.com [172.19.155.138]) by cia-dc07.mx.aol.com (v129.8) with ESMTP id MAILCIADC074-ab834d46d16920d; Mon, 31 Jan 2011 10:12:41 -0500 From: Sky2high@aol.com X-Original-Message-ID: <3ef38.2f432c56.3a782b69@aol.com> X-Original-Date: Mon, 31 Jan 2011 10:12:41 EST Subject: Re: [LML] Re: Need advice on improving cooling X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_3ef38.2f432c56.3a782b69_boundary" X-Mailer: AOL 9.5 sub 5400 X-AOL-IP: 24.15.17.119 X-Spam-Flag:NO X-AOL-SENDER: Sky2high@aol.com --part1_3ef38.2f432c56.3a782b69_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Bryan, If the engine is in its first 40-60 hours of operation and has not been long above 75% power, higher cylinder head temps are normal from the friction generated as the rings seat to the cylinder walls. I'm guessing my base HP is around 170+ HP on a 320 with a 9:1 CR. I get a fuel flow of about 15.2 gph at 2740 rpm, WOT (takeoff power). You should probably see more flow. Your temps in climb can be moderated by maintaining around 135-140 KIAS rather than Vx or Vy. Even though I use an external NACA for oil cooler air and dump it out into the lower cowl area, In warmer weather I see elevated temps on climb (190F) and in the pattern (200F) with my 7 vane S&W. However, in cruise in these winter temps I frequently have to close the cooler intake door to get the temp up to 180F. The 195 you see in cruise may also be due to engine break in temps. It does seem somewhat high for now. Scott Krueger In a message dated 1/31/2011 7:23:15 A.M. Central Standard Time, vonjet@gmail.com writes: I don't recall the exact number for the fuel on take off but I know we checked it and it was where it should be. Oil temps will go to 210-220 on climb but will cool to 195 or so during cruise. Then once I get on the ground oil comes back to about 205-210 while taxiing back to the hangar. Bryan On Jan 30, 2011 7:33 AM, <_Sky2high@aol.com_ (mailto:Sky2high@aol.com) > wrote: > Bryan, > > What's the fuel flow during max power (takeoff)? > What is your oil temp doing? > > Grayhawk > > > In a message dated 1/29/2011 10:36:52 P.M. Central Standard Time, > _vonjet@gmail.com_ (mailto:vonjet@gmail.com) writes: > > My airplane: Lancair 360, 180hp 360 carburated. I have a plenum to cool and > I am feeding the oil cooler with air off the #3 cyl. > My chts are high on the ground and takeoff. The oil temp is high on the > ground as well. Its to the point where I can't takeoff if I'm on the ground > too long. And the hotter days aren't even here yet. > Also my carb temp climbs on the ground and pegs at the gauge limit of 127 > degrees. I've replaced the probe and the manufacturer seems to think its > operating normally. This would make me believe my lower cowling area is > getting hot and not enough air flowing out of it. > My AP has checked my engine, compression, timing etc and doesn't believe > there is any issues with it. The cooler is a 9 vane SW that was new when > installed. > My plan was to add cowling louvers to the lower cowling on each side below > the cyl banks. I would hope this would improve the air movement out the > cowling. > I read that cht probes could read high if they run close to the exhaust in > a tight cowling. Mine do. Also the carb probe is kind of close to the > exhaust as well. Not sure if this is my case. All my baffles are in place and > properly sealed. > Anybody have any advice on where to place these or other ideas that would > improve cooling or things to check > Bryan --part1_3ef38.2f432c56.3a782b69_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
Bryan,
 
If the engine is in its first 40-60 hours of operation and has not be= en=20 long above 75% power, higher cylinder head temps are normal from the frict= ion=20 generated as the rings seat to the cylinder walls.
 
I'm guessing my base HP is around 170+ HP on a 320 with a 9:1=20 CR.  I get a fuel flow of about 15.2 gph at 2740 rpm, WOT (takeoff=20 power).  You should probably see more flow.
 
Your temps in climb can be moderated by maintaining around 135-140 KI= AS=20 rather than Vx or Vy.
 
Even though I use an external NACA for oil cooler air and dump it out= into=20 the lower cowl area, In warmer weather I see elevated temps on climb (190F= ) and=20 in the pattern (200F) with my 7 vane S&W.  However, in cruise in= =20 these winter temps I frequently have to close the cooler intake door= =20 to get the temp up to 180F.
 
The 195 you see in cruise may also be due to engine break in tem= ps. It=20 does seem somewhat high for now.
 
Scott Krueger
   
In a message dated 1/31/2011 7:23:15 A.M. Central Standard Time,=20 vonjet@gmail.com writes:

I don't recall the exact number for the fuel on take off but I know= we=20 checked it and it was where it should be.
Oil temps will go to 210-22= 0 on=20 climb but will cool to 195 or so during cruise. Then once I get on the= ground=20 oil comes back to about 205-210 while taxiing back to the hangar.

Bryan

On Jan 30, 2011 7:33 AM, <Sky2high@aol.com> wrote:
> Bryan,
>
> What= 's the fuel flow during=20 max power (takeoff)?
> What is your oil temp doing?
>
&g= t;=20 Grayhawk
>
>
> In a message dated 1/29/2011 10:36:52= P.M.=20 Central Standard Time,
> vonjet@gmail.com writes:
>
&g= t;=20 My airplane: Lancair 360, 180hp 360 carburated. I have a plenum to cool= and=20
> I am feeding the oil cooler with air off the #3 cyl.
>= My chts=20 are high on the ground and takeoff. The oil temp is high on the
>= =20 ground as well. Its to the point where I can't takeoff if I'm on the gro= und=20
> too long. And the hotter days aren't even here yet.
> Al= so my=20 carb temp climbs on the ground and pegs at the gauge limit of 127
&g= t;=20 degrees. I've replaced the probe and the manufacturer seems to think its= =20
> operating normally. This would make me believe my lower cowling= area=20 is
> getting hot and not enough air flowing out of it.
>= My AP=20 has checked my engine, compression, timing etc and doesn't believe
&= gt;=20 there is any issues with it. The cooler is a 9 vane SW that was new when= =20
> installed.
> My plan was to add cowling louvers to the= lower=20 cowling on each side below
> the cyl banks. I would hope this wou= ld=20 improve the air movement out the
> cowling.
> I read that= cht=20 probes could read high if they run close to the exhaust in
> a ti= ght=20 cowling. Mine do. Also the carb probe is kind of close to the
>= exhaust=20 as well. Not sure if this is my case. All my baffles are in place and >=20 properly sealed.
> Anybody have any advice on where to place thes= e or=20 other ideas that would
> improve cooling or things to check
&= gt;=20 Bryan
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