Return-Path: Received: from sccrmhc13.comcast.net ([204.127.202.64] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 373947 for flyrotary@lancaironline.net; Sat, 21 Aug 2004 23:50:56 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.202.64; envelope-from=kenpowell@comcast.net Received: from 204.127.205.145 ([204.127.205.145]) by comcast.net (sccrmhc13) with SMTP id <2004082203501901600jup3be>; Sun, 22 Aug 2004 03:50:24 +0000 Received: from [68.51.44.162] by 204.127.205.145; Sun, 22 Aug 2004 03:50:18 +0000 From: kenpowell@comcast.net To: "Rotary motors in aircraft" Subject: Rusty's intake Date: Sun, 22 Aug 2004 03:50:18 +0000 Message-Id: <082220040350.13774.412817FA00090AD5000035CE220076230204040A99019F020A05@comcast.net> X-Mailer: AT&T Message Center Version 1 (Jul 16 2004) X-Authenticated-Sender: a2VucG93ZWxsQGNvbWNhc3QubmV0 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_13774_1093146618_0" --NextPart_Webmail_9m3u9jl4l_13774_1093146618_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Rusty, I only remember seeing one set of pictures of your latest manifold (actually, you were showing the pictures of the crack in your intake plenum) and I was wondering about this stuff at that time but didn't bring up the subject of intake maniflod length. What is the diamenter of the sceet tubing that runs from your throttle body to your plenum? If the tubing is not considerably larger, imagine what the intake pulses 'see' when the TB is wide open. In other words, the motor may be functioning at WOT as if the intake tubes are VERY long which will keep the motor from turning high RPM. The opposite problem of this is an intake that has short tubes for high RPM but the prop load keeps the motor from ever reaching the area of the power curve where the motor can function in the designed power band. When I calculated this length (and I don't remember what temp I used) I came up with something like 12" for 7500 rpm. I think I have the calcs at work if anyone is interested. Ed, how about a sanity check. Ken Powell -------------- Original message -------------- Always a sucker for a function or an equal sign. AM going out to put on gearbox tomorrow. Bad week, nothing like disasters just everything from two cars that failed inspection, tires, mufflers. Program set back and to top it off the IRS sent this old retired guy a letter telling him since he's not working and having withholdings from salary - they expect him to make estimated payments each quarter ARgggg!. Sure glad we have this group - keeps me on the right side of the line. Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message ----- From: Russell Duffy To: Rotary motors in aircraft Sent: Saturday, August 21, 2004 10:21 PM Subject: [FlyRotary] Re: EM-2 MAP readings But - by personal experience, the wraparound manifold you have should work well with the <=7K steady state area you plan to operate in. -Mike Thanks for the additional comments Mike, and also Ed. I knew a little math would draw him into the conversation :-) Cheers, Rusty --NextPart_Webmail_9m3u9jl4l_13774_1093146618_0 Content-Type: text/html Content-Transfer-Encoding: 8bit

Rusty,

I only remember seeing one set of pictures of your latest manifold (actually, you were showing the pictures of the crack in your intake plenum) and I was wondering about this stuff at that time but didn't bring up the subject of intake maniflod length. What is the diamenter of the sceet tubing that runs from your throttle body to your plenum?  If the tubing is not considerably larger, imagine what the intake pulses 'see' when the TB is wide open.  In other words, the motor may be functioning at WOT as if the intake tubes are VERY long which will keep the motor from turning  high RPM. The opposite problem of this is an intake that has short tubes for high RPM but the prop load keeps the motor from ever reaching the area of the power curve where the motor can function in the designed power band. When I calculated this length (and I don't remember what temp I used) I came up with something like 12" for 7500 rpm.  I think I have the calcs at work if anyone is interested.  Ed, how about a sanity check. 

Ken Powell

-------------- Original message --------------
Always a sucker for a function or an equal sign. AM going out to put on gearbox tomorrow. Bad week, nothing like disasters just everything from two cars that failed inspection, tires, mufflers. Program set back and to top it off the IRS sent this old retired guy a letter telling him since he's not working and having withholdings from salary - they expect him to make estimated payments each quarter ARgggg!.
Sure glad we have this group - keeps me on the right side of the line.
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From: Russell Duffy
To: Rotary motors in aircraft
Sent: Saturday, August 21, 2004 10:21 PM
Subject: [FlyRotary] Re: EM-2 MAP readings

But - by personal experience, the wraparound manifold you have should
work well with the <=7K steady state area you plan to operate in.

-Mike

Thanks for the additional comments Mike, and also Ed. I knew a little math would draw him into the conversation :-)
Cheers,
Rusty



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