X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from poplet2.per.eftel.com ([203.24.100.45] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4216540 for flyrotary@lancaironline.net; Sat, 10 Apr 2010 03:15:28 -0400 Received-SPF: none receiver=logan.com; client-ip=203.24.100.45; envelope-from=lendich@aanet.com.au Received: from sv1-1.aanet.com.au (mail.aanet.com.au [203.24.100.34]) by poplet2.per.eftel.com (Postfix) with ESMTP id 81188173617 for ; Sat, 10 Apr 2010 15:14:47 +0800 (WST) Received: from ownerf1fc517b8 (203.171.92.134.static.rev.aanet.com.au [203.171.92.134]) by sv1-1.aanet.com.au (Postfix) with SMTP id BAD5DBEC01F for ; Sat, 10 Apr 2010 15:14:46 +0800 (WST) Message-ID: <516703A6A2864C05BCD9E799E30438AD@ownerf1fc517b8> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Slide throttle. Date: Sat, 10 Apr 2010 17:14:47 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01CAD8D1.527AE270" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 100409-1, 04/09/2010), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0005_01CAD8D1.527AE270 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Lynn, I wish I had seen the Lucas design sooner, I guess this is the design = someone on the other discussion copied and used a Teflon slide rather = than the rollers. I vote for rollers and steel slide, now how the hell = am I going to do it. I tried rollers on the slide itself and it was = very fiddly and in the end not so perfect. Maybe they have rollers in = strips and one can just screw/ pin the strip in somehow. I don't like = using small screws for obvious reasons. Do you know how they kept the sides from skewing? George=20 When racing engines started surviving blasts up to 10,000 RPM, it = became a requirement to have an inlet runner under about 10". So even a = Weber or Delorto bolted right to the cylinder head became a bit too = long.=20 Going to the slide throttle (Lucas) allows for a shorter tuned length = and a pure tube, with no throttle shaft and butterfly in the flow.=20 Not strange at all that the Lucas units have a Weber bolt pattern and = gasket shape.=20 At the same time Lucas came up with a high pressure mechanical = injection (about 95 PSI) that works great and tunes by lifting a plunger = and turning it to a different position. Even I could do it. I never encountered the poor idle advertised in some locations. My = factory Pport modified by Mandeville, to the point that a child could = reach into the chamber through the intake, idled like a street engine.=20 We drove it to the false grid with no difficulty. The Bridge ported = side port engines must be towed around with little tractors. Neither has = any power below 2,000 RPM but the side port pops and farts, and stalls = and gets carb fires and is a general pain to deal with. Just never a = factor with the Pport.=20 When you are building runners 18-24 inchesl long it just seems a shame = to spend so much time on a slide throttle. The Lucas piece is well = thought out. Hardened slide with rows of bearing rollers supporting the = slide. It never hangs up no matter the load on it.=20 Lynn E. Hanover ------=_NextPart_000_0005_01CAD8D1.527AE270 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Lynn,

I wish I had seen the Lucas design = sooner, I guess=20 this is the design someone on the other discussion copied and used a = Teflon=20 slide rather than the rollers. I vote for rollers and steel slide, now = how the=20 hell am I going to do it. I tried rollers on the slide itself and = it was=20 very fiddly and in the end not so perfect. Maybe they have rollers in = strips and=20 one can just screw/ pin the strip in somehow. I don't like using small = screws=20 for obvious reasons.

Do you know how they kept the sides = from=20 skewing?

George

When racing engines started surviving blasts up to 10,000 RPM, it = became=20 a requirement to have an inlet runner under about 10". So even a Weber = or=20 Delorto bolted right to the cylinder head became a bit too long. =

Going to the slide throttle (Lucas) allows for a shorter tuned = length and=20 a pure tube, with no throttle shaft and butterfly in the flow.

Not strange at all that the Lucas units have a Weber bolt pattern = and=20 gasket shape.

At the same time Lucas came up with a high pressure mechanical = injection=20 (about 95 PSI) that works great and tunes by lifting a plunger and = turning it=20 to a different position. Even I could do it.

I never encountered the poor idle advertised in some locations. = My=20 factory Pport modified by Mandeville, to the point that a child could = reach=20 into the chamber through the intake, idled like a street = engine.

We drove it to the false grid with no difficulty. The Bridge = ported side=20 port engines must be towed around with little tractors. Neither has = any power=20 below 2,000 RPM but the side port pops and farts, and stalls and gets = carb=20 fires and is a general pain to deal with. Just never a factor with the = Pport.

When you are building runners 18-24 inchesl long it just seems a = shame to=20 spend so much time on a slide throttle. The Lucas piece is well = thought out.=20 Hardened slide with rows of bearing rollers supporting the slide. It = never=20 hangs up no matter the load on it.

Lynn E. Hanover

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