X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 25 May 2012 09:59:28 -0400 Message-ID: X-Original-Return-Path: Received: from mail.grobsystems.com ([74.218.59.19] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTP id 5559548 for lml@lancaironline.net; Fri, 25 May 2012 08:33:36 -0400 Received-SPF: none receiver=logan.com; client-ip=74.218.59.19; envelope-from=btv1==492823654f6==bronnenmeier@grobsystems.com X-ASG-Debug-ID: 1337949181-03e9c30e413cc00001-yPXFKn Received: from bluexch01.grob.local ([10.10.0.103]) by mail.grobsystems.com with ESMTP id vgv5fm1tK0LuOfHV for ; Fri, 25 May 2012 08:33:01 -0400 (EDT) X-Barracuda-Envelope-From: bronnenmeier@GROBSYSTEMS.COM X-ASG-Whitelist: Client X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01CD3A72.773B2AE3" Subject: boost pump for engine cooling 4P X-Original-Date: Fri, 25 May 2012 08:32:36 -0400 X-ASG-Orig-Subj: boost pump for engine cooling 4P X-Original-Message-ID: <03E004EAF5B4DC4186EDF0995C9FE57102F98F33@bluexch01.grob.local> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: boost pump for engine cooling 4P Thread-Index: Ac06bjfMJy51jZV9S6uLvVO5GjxYXg== From: X-Original-To: X-Barracuda-Connect: UNKNOWN[10.10.0.103] X-Barracuda-Start-Time: 1337949181 X-Barracuda-URL: http://74.218.59.19:80/cgi-mod/mark.cgi X-Virus-Scanned: by bsmtpd at grobsystems.com This is a multi-part message in MIME format. ------_=_NextPart_001_01CD3A72.773B2AE3 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Dear subscribers, =20 A while back I reported a warmer cylinder 4 during climb at 32 MAP and 2500 rpm. Lynn recommended I could test high boost during climb and see if it makes a difference. =20 In the mean time I cranked up my fuel pump by approx. 1 GPH. At take-off I see now 42.5 GPH at 38.4 MAP 2680 rpm (on a TSIO550 B which is rated for 38 MAP at 41...43GPH according to my manual).=20 =20 In climb under full rpm/MAP engine stays very nice and cool. =20 Climb 2500 rpm with 32MAP: all EGTs show the same, after increasing the fuel flow all CHTs stay generally a bit cooler but CHT 4 is still the one that runs a little warmer. During climb when CHT4 approached 380 I turned the high boost on - the CHT went down by approx. 10 degrees back into the 360's. During the climb to 18000 I had the boost pump on 3 times for may be 2 min each time. The Fuel flow increased from 30.5 to 33 GPH. I climbed with +-170 kts at 1000 fpm. This is new: usually I was never able to get the CHT down in climb unless I decreased the climb rate. =20 Question: is it a reasonable practice to use the high boost for engine cooling? How long can it run in high boost without getting damaged? =20 Craig reported earlier that he had his fuel pump modified to feed more fuel under partial power - this sounds complicated and expensive and if I don't have to I would rather not go there. =20 Thanks for you input =20 Ralf =20 =20 ------_=_NextPart_001_01CD3A72.773B2AE3 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Dear = subscribers,

A while back I reported a warmer cylinder 4 during = climb at 32 MAP and 2500 rpm. Lynn recommended I could test high boost = during climb and see if it makes a difference.

In the mean = time I cranked up my fuel pump by approx. 1 GPH. At take-off I see now = 42.5 GPH at 38.4 MAP 2680 rpm (on a TSIO550 B which is rated for 38 MAP = at 41…43GPH according to my manual).

In climb = under full rpm/MAP engine stays very nice and cool.

Climb 2500 = rpm with 32MAP: all EGTs show the same, after increasing the fuel flow = all CHTs stay generally a bit cooler but CHT 4 is still the one that = runs a little warmer. During climb when CHT4 approached 380 I turned the = high boost on – the CHT went down by approx. 10 degrees back into = the 360’s. During the climb to 18000 I had the boost pump on 3 = times for may be 2 min each time. The Fuel flow increased from 30.5 to = 33 GPH. I climbed with +-170 kts at 1000 fpm. This is new: usually = I was never able to get the CHT down in climb unless I decreased the = climb rate.

Question: is it a reasonable practice to use the high = boost for engine cooling? How long can it run in high boost without = getting damaged?

Craig = reported earlier that he had his fuel pump modified to feed more fuel = under partial power – this sounds complicated and expensive and if = I don’t have to I would rather not go there.

Thanks for = you input

=

Ralf

------_=_NextPart_001_01CD3A72.773B2AE3--