X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ispmxmta09-srv.alltel.net ([166.102.165.170] verified) by logan.com (CommuniGate Pro SMTP 5.0.3) with ESMTP id 873316 for flyrotary@lancaironline.net; Tue, 13 Dec 2005 00:03:07 -0500 Received-SPF: pass receiver=logan.com; client-ip=166.102.165.170; envelope-from=montyr2157@alltel.net Received: from Thorstwin ([4.89.248.200]) by ispmxmta09-srv.alltel.net with SMTP id <20051213050220.GJIG12342.ispmxmta09-srv.alltel.net@Thorstwin> for ; Mon, 12 Dec 2005 23:02:20 -0600 Message-ID: <004401c5ffa2$66345e20$98e1e204@Thorstwin> From: "Monty Roberts" To: Subject: Pport advice from the master Date: Mon, 12 Dec 2005 23:02:20 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0041_01C5FF70.1AFC9CB0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0041_01C5FF70.1AFC9CB0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable So tuning on the exhaust is more important than the back pressure. I = have room for about 26 inch primaries on the exh. without gymnastics. = Over that length, I have to get creative and things start to look like a = bunch of stainless entrails. The intake port 1 7/8 dia? or smaller? I've been toying with the Idea of mechanical injection and an MSD = ignition on the leading plugs with magneto trailing. Have yet to decide = over EFI. On the redrive ratio. The prop becomes a problem for speeds at and over = 250 mph with the 2.87. The inner part of the prop disc, even with a 16in = spinner becomes pure drag at that speed. I am also trying to keep the = nose from being too high in the air on a relatively short tail dragger. = The ideal set up would be a 2.5 reduction ratio and a 68 in variable = pitch prop for my particular application. 2.17 is the closest I can get = in a proven gear set. The GM TH350 first planet is 2.5 but it is a screw = ball set up and short of a $1000+ billet drag racer special, is not = available in a 6 pinion planet carrier. So it is a compromise. Give up a = little in climb and take-off for top speed and cruise. With power to = burn this is not an issue. If it is a CS prop will fix it. In my opinion = a CS prop will do more for performance than a turbo ever will. Besides = to make a turbo work right you really need a CS prop. ED what's up with = that thing, has our spook abandoned us??? Monty ------=_NextPart_000_0041_01C5FF70.1AFC9CB0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

So tuning on the exhaust is more = important than the=20 back pressure. I have room for about 26 inch primaries on the exh. = without=20 gymnastics. Over that length, I have to get creative and things start to = look=20 like a bunch of stainless entrails.

The intake port 1 7/8 dia? or=20 smaller?

I've been toying with the Idea of = mechanical=20 injection and an MSD ignition on the leading plugs with magneto = trailing. Have=20 yet to decide over EFI.

On the redrive ratio. The prop becomes = a problem=20 for speeds at and over 250 mph with the 2.87. The inner part of the prop = disc,=20 even with a 16in spinner becomes pure drag at that speed. I am also = trying to=20 keep the nose from being too high in the air on a relatively short tail = dragger.=20 The ideal set up would be a 2.5 reduction ratio and a 68 in = variable pitch=20 prop for my particular application. 2.17 is the closest I can get in a = proven=20 gear set. The GM TH350 first planet is 2.5 but it is a screw ball = set up=20 and short of a $1000+ billet drag racer special, is not available = in a 6=20 pinion planet carrier. So it is a compromise. Give up a little in climb = and=20 take-off for top speed and cruise. With power to burn this is not = an issue.=20 If it is a CS prop will fix it. In my opinion a CS prop will do = more for=20 performance than a turbo ever will. Besides to make a turbo work right = you=20 really need a CS prop. ED what's up with that thing, has our spook = abandoned=20 us???

Monty

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