X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 13 Jul 2008 14:14:50 -0400 Message-ID: X-Original-Return-Path: Received: from smtp0.av-mx.com ([137.118.16.56] verified) by logan.com (CommuniGate Pro SMTP 5.2.5) with ESMTP id 3024111 for lml@lancaironline.net; Sun, 13 Jul 2008 13:08:06 -0400 Received-SPF: pass receiver=logan.com; client-ip=137.118.16.56; envelope-from=pinetownd@volcano.net Received: from DennisDell (65-174-1-60.dsl.volcano.net [65.174.1.60]) (Authenticated sender: pinetownd@volcano.net) by smtp0.av-mx.com (Postfix) with ESMTP id A2EAD1BF5AC for ; Sun, 13 Jul 2008 13:07:27 -0400 (EDT) X-Original-Message-ID: From: "Dennis Johnson" X-Original-To: "Lancair Mailing List" Subject: IO-550 Options X-Original-Date: Sun, 13 Jul 2008 10:07:21 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0032_01C8E4D0.3DB7B800" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5512 This is a multi-part message in MIME format. ------=_NextPart_000_0032_01C8E4D0.3DB7B800 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Valin and Allyson, I have an IO-550 EXP engine from Performance Engines with one Lightspeed = Plasma III electronic ignition, one magneto with impulse coupling, 8.7:1 = compression ratio pistons, and ram air. I'm have 150 hours on the = engine. I've been very happy with the support from Performance Engines. The = electronic ignition and the magneto have been completely trouble free. = (This is pure speculation, but I wonder if the repeated problems a few = have had with electronic ignition is related to installation issues; = I've heard that they don't like too much heat?) I'm happy with my decision to go with one electronic ignition and one = magneto and 8.7:1 compression ratio, but I might have been equally happy = with two electronic ignitions or two magnetos and high compression = pistons. I can make a good argument on both sides of this debate. If I were doing it again, I'd eliminate the ram air option and instead = go with something like the system developed by Steve Colwell (search the = LML for details). The ram air only gains you about an inch of manifold = pressure, and some of that gain may be due to bypassing inefficient air = flow through the diverter when the air filter is selected. Ram air may = also cause problems running lean of peak. I'd also use Scott Alair's method of providing higher pressure air to = the fuel injector vents. It's a low cost, light weight solution that = seems to allow operating lean of peak when using ram air. (Search the = LML) I installed Andair's gascolator and air/oil separator, and both have = been trouble free. I used Barry rubber engine mounts (ACS part #94011-20) because the Lord = mounts were out of stock when I ordered. At Lancair flyins, I noticed = that most engines had sagged so that the prop spinner was lower than the = cowl. As a result, I installed my engine a little high so that when it = sagged, the prop spinner would line up with the cowl. Well, I'm still = waiting for the engine to sag, which means I'm the only one at a flyin = with the prop spinner higher than the cowl. I don't know if that is = because of the Barry mounts instead of Lord mounts. (Actually, my = engine has sagged some, perhaps half of what it needs for the spinner to = line up with the cowl. Maybe it will be at the right height when it's = time for overhaul?) Best, Dennis Johnson Legacy 150 hours, leaving for Alaska next Monday =20 ------=_NextPart_000_0032_01C8E4D0.3DB7B800 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable

Hi Valin and Allyson,

I have an IO-550 EXP engine from Performance Engines with one = Lightspeed=20 Plasma III electronic ignition, one magneto with impulse coupling, 8.7:1 = compression ratio pistons, and ram air. I'm have 150 hours on the=20 engine.

I've been very happy with the support from Performance = Engines. The=20 electronic ignition and the magneto have been completely trouble = free. =20 (This is pure speculation, but I wonder if the repeated problems a=20 few have had with electronic ignition is related to installation = issues;=20 I've heard that they don't like too much heat?)

I'm happy with my decision to go with one electronic ignition and = one=20 magneto and 8.7:1 compression ratio, but I might have been equally happy = with=20 two electronic ignitions or two magnetos and high compression = pistons. I=20 can make a good argument on both sides of this debate.

If I were doing it again, I'd eliminate the ram air option and = instead go=20 with something like the system developed by Steve Colwell (search the = LML for=20 details). The ram air only gains you about an inch of manifold = pressure,=20 and some of that gain may be due to bypassing inefficient air flow = through=20 the diverter when the air filter is selected. Ram air may also = cause=20 problems running lean of peak.

I'd also use Scott Alair's method of providing higher pressure air = to the=20 fuel injector vents. It's a low cost, light weight = solution that=20 seems to allow operating lean of peak when using ram = air. =20 (Search the LML)

I installed Andair's gascolator and air/oil separator, and both = have been=20 trouble free.

I used Barry rubber engine mounts (ACS part #94011-20) because the = Lord=20 mounts were out of stock when I ordered. At Lancair flyins, I = noticed that=20 most engines had sagged so that the prop spinner was lower than the=20 cowl. As a result, I installed my engine a little high = so that=20 when it sagged, the prop spinner would line up with the cowl. = Well, I'm=20 still waiting for the engine to sag, which means I'm the only one at a = flyin=20 with the prop spinner higher than the cowl. I don't know if that = is=20 because of the Barry mounts instead of Lord mounts. (Actually, my = engine=20 has sagged some, perhaps half of what it needs for the spinner to = line up=20 with the cowl. Maybe it will be at the right height when it's time = for=20 overhaul?)

Best,

Dennis Johnson

Legacy 150 hours, leaving for Alaska next Monday =

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