Return-Path: Received: from sccrmhc13.comcast.net ([204.127.202.64] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 567914 for flyrotary@lancaironline.net; Tue, 14 Dec 2004 22:04:31 -0500 Received-SPF: none receiver=logan.com; client-ip=204.127.202.64; envelope-from=kenpowell@comcast.net Received: from 204.127.205.142 (unknown[204.127.205.159](misconfigured sender)) by comcast.net (sccrmhc13) with SMTP id <20041215030352016007jgkee>; Wed, 15 Dec 2004 03:04:02 +0000 Received: from [166.102.160.133] by 204.127.205.142; Wed, 15 Dec 2004 03:03:51 +0000 From: kenpowell@comcast.net To: "Rotary motors in aircraft" Subject: Injectors size Date: Wed, 15 Dec 2004 03:03:51 +0000 Message-Id: <121520040303.17076.41BFA99500043BAC000042B4220700320104040A99019F020A05@comcast.net> X-Mailer: AT&T Message Center Version 1 (Nov 22 2004) X-Authenticated-Sender: a2VucG93ZWxsQGNvbWNhc3QubmV0 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_17076_1103079831_0" --NextPart_Webmail_9m3u9jl4l_17076_1103079831_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Steve, according to RC Engineering's worksheet four (4) 43 lb injectors at 38 PSI / .55 BSFC / .8 duty cycle should be good for 230 HP continuous. Ken Powell -------------- Original message -------------- > One nagging problem that I have is the engine running rich at low power > levels. I've turned the fuel pressure regulator down to 30 lbs to get it > reasonably lean, but I still don't have enough adjustment. The higher power > levels have a pretty good mixture on the default tuning. > > Right now I'm running the stock 550cc injectors, but I'm considering > changing the primary injectors to 440cc, to help the low end mixture, and > leave the secondaries at 550cc, so that I still get sufficient fuel flow > with the turbo at higher power settings. > > My thinking is that the 440cc injectors would allow me turn the fuel > pressure back up to 38 lbs. and hopefully still be able to tune the lower > end where only the primary injectors are supplying fuel. > > Does anyone have experience doing this, hopefully with a turbo, or just have > an opinion ? > > Steve Brooks > > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html --NextPart_Webmail_9m3u9jl4l_17076_1103079831_0 Content-Type: text/html Content-Transfer-Encoding: 8bit

Steve, according to RC Engineering's worksheet four (4) 43 lb injectors at 38 PSI / .55 BSFC / .8 duty cycle should be good for 230 HP continuous.

Ken Powell

-------------- Original message --------------

> One nagging problem that I have is the engine running rich at low power
> levels. I've turned the fuel pressure regulator down to 30 lbs to get it
> reasonably lean, but I still don't have enough adjustment. The higher power
> levels have a pretty good mixture on the default tuning.
>
> Right now I'm running the stock 550cc injectors, but I'm considering
> changing the primary injectors to 440cc, to help the low end mixture, and
> leave the secondaries at 550cc, so that I still get sufficient fuel flow
> with the turbo at higher power settings.
>
> My thinking is that the 440cc injectors would allow me turn the fuel
> pressure back up to 38 lbs. and hopefully still be able to tune the lower
> end where only the primary injectors are supplying fuel.
>
> Does anyone have experience doing this, hopefully with a turbo, or just have
> an opinion ?
>
> Steve Brooks
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html

--NextPart_Webmail_9m3u9jl4l_17076_1103079831_0--