X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 01 Feb 2011 07:48:42 -0500 Message-ID: X-Original-Return-Path: Received: from mail-wy0-f180.google.com ([74.125.82.180] verified) by logan.com (CommuniGate Pro SMTP 5.4c2a) with ESMTPS id 4833425 for lml@lancaironline.net; Mon, 31 Jan 2011 21:43:36 -0500 Received-SPF: pass receiver=logan.com; client-ip=74.125.82.180; envelope-from=vonjet@gmail.com Received: by wyb28 with SMTP id 28so7110695wyb.25 for ; Mon, 31 Jan 2011 18:43:02 -0800 (PST) DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=eDVrSde3xNoaHcM+Xo+f4+Z2X/aSxFLxFhhw79K1rv3sqhw8ZJ9yIAfLUKL+Uw2S1F X+2OxOKDkfKCf8/Q/oLVssJY/I+aH0GHXfNwLq9K1gfnYDGRQYq83ob/7gUx2fBEsVox I0nO7tSzZN4rnxAwDx4PQO0pLSRt2aBuzmdeA= MIME-Version: 1.0 Received: by 10.216.159.69 with SMTP id r47mr67644wek.105.1296528181729; Mon, 31 Jan 2011 18:43:01 -0800 (PST) Received: by 10.216.10.205 with HTTP; Mon, 31 Jan 2011 18:43:01 -0800 (PST) In-Reply-To: References: X-Original-Date: Mon, 31 Jan 2011 18:43:01 -0800 X-Original-Message-ID: Subject: Re: [LML] Re: Need advice on improving cooling From: Bryan Wullner X-Original-To: Lancair Mailing List Content-Type: multipart/alternative; boundary=0016e65b40b8b69a3f049b2f7d75 --0016e65b40b8b69a3f049b2f7d75 Content-Type: text/plain; charset=ISO-8859-1 Engine has over 450 hours on it. So I dont think its the break in. The cylinders are Chrome. Compression is good, timing correct, had my AP boroscope the cylinders and he said nothing looks unusal in there. Im going to check the Vernatherm next. Bryan On Mon, Jan 31, 2011 at 11:21 AM, wrote: > 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. > Engine > 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, 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 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 > > --0016e65b40b8b69a3f049b2f7d75 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Engine has over 450 hours on it. So I dont think its the break in. The cyli= nders are Chrome. Compression is good, timing correct, had my AP boroscope = the cylinders and he said nothing looks unusal in there.=A0

Im going to check the Vernatherm next.=A0

Bry= an

On Mon, Jan 31, 2011 at 11:21 AM, <Sky2high@aol.com= > wrote:
Bryan,
=A0
If the engine is in its first 40-60 hours of operation and has not bee= n=20 long above 75% power, higher cylinder head temps are normal from the fricti= on=20 generated as the rings seat to the cylinder walls.
=A0Engine
I'm guessing my base HP is around 170+ HP on a 320 with a=A09:1=20 CR.=A0 I get a fuel flow of about 15.2 gph at 2740 rpm, WOT (takeoff=20 power).=A0 You should probably see more flow.
=A0
Your temps in climb can be moderated by maintaining around 135-140 KIA= S=20 rather than Vx or Vy.
=A0
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.=A0 However, in cruise in=20 these=A0winter temps I frequently have to close the cooler intake door=20 to=A0get the temp up to 180F.
=A0
The 195 you see in cruise may also=A0be due to engine break in temps. = It=20 does seem somewhat high for now.
=A0
Scott Krueger
=A0=A0=A0
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 kno= w we=20 checked it and it was where it should be.
Oil temps will go to 210-220= on=20 climb but will cool to 195 or so during cruise. Then once I get on the gr= ound=20 oil comes back to about 205-210 while taxiing back to the hangar.

Bryan

On Jan 30, 2011 7:33 A= M, <Sky2high@aol.com> wrote:
> Bryan,
>
> What's the fuel flow during=20 max power (takeoff)?
> What is your oil temp doing?
>
>= ;=20 Grayhawk
>
>
> In a message dated 1/29/2011 10:36:52 = P.M.=20 Central Standard Time,
> vonjet@gmail.com writes:=
>
>=20 My airplane: Lancair 360, 180hp 360 carburated. I have a plenum to cool a= nd=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 ground=20
> too long. And the hotter days aren't even here yet.
>= Also my=20 carb temp climbs on the ground and pegs at the gauge limit of 127
>= ;=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 >=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 lo= wer=20 cowling on each side below
> the cyl banks. I would hope this woul= d=20 improve the air movement out the
> cowling.
> I read that c= ht=20 probes could read high if they run close to the exhaust in
> a tig= ht=20 cowling. Mine do. Also the carb probe is kind of close to the
> ex= haust=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 these= or=20 other ideas that would
> improve cooling or things to check
&g= t;=20 Bryan

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