X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost02.isp.att.net ([204.127.217.102] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3734653 for flyrotary@lancaironline.net; Sat, 27 Jun 2009 13:48:23 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.217.102; envelope-from=keltro@att.net DKIM-Signature: v=1; q=dns/txt; d=att.net; s=dkim01; i=keltro@att.net; a=rsa-sha256; c=relaxed/relaxed; t=1246124904; h=Content-Type: MIME-Version:In-Reply-To:Message-Id:Date:Subject:To:From; bh=a4gHoK RsOkDP+WzgVyxwBHKwAGkZHVnDft9HZWsSgCo=; b=qoZHmjK3UbALLx4SlSjvLSyeO W6XQHcAD2Y1ivvIgeL5ebxV+HcvsFZvE8bk5j73K76ngBvFLlv8FObOaKiAQg== Received: from fwebmail05.isp.att.net ([204.127.218.105]) by isp.att.net (frfwmhc02) with SMTP id <20090627174748H0200a7gmde>; Sat, 27 Jun 2009 17:47:48 +0000 X-Originating-IP: [204.127.218.105] Received: from [64.250.206.192] by fwebmail05.isp.att.net; Sat, 27 Jun 2009 17:47:46 +0000 From: "Kelly Troyer" To: "Rotary motors in aircraft" Subject: Mallory fuel pressure regulator Date: Sat, 27 Jun 2009 17:47:46 +0000 Message-Id: <062720091747.7898.4A465B42000B876000001EDA22230682229B0A02D29B9B0EBF019D9B040A05@att.net> In-Reply-To: X-Mailer: AT&T Message Center Version 1 (Mar 2 2009) X-Authenticated-Sender: a2VsdHJvQGF0dC5uZXQ= MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_7898_1246124866_0" --NextPart_Webmail_9m3u9jl4l_7898_1246124866_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Thanks Steve.............It never fails to amaze me the ingenuity and willingness to be of help to others of the group of all our contributing members................ Best Regards, -- Kelly Troyer "Dyke Delta"_13B ROTARY Engine "RWS"_RD1C/EC2/EM2 "Mistral"_Backplate/Oil Manifold -------------- Original message from Steven Boese : -------------- > At the Rotorfest, I showed some data concerning fuel pressure > instability with my Mallory adjustable regulator and the improvement as > a result of installing the non-adjustable OEM Mazda regulator. > > Recently, I noticed that Mallory came out with a rebuild kit (part# > 3178) for the 4305M/4307M regulator which appeared to be a different > design rather than simply replacement parts. > > Out of curiosity, I ordered the kit to see if the regulator would > actually regulate with the new parts. The picture labeled "new parts > bad seat" shows what I received. The teflon seat looked like it had > been hacked out with a dull serrated knife. I coated the ball with a > magic marker and placed it on the seat so the points of contact would > show up black in the picture. There was no way that the parts would > work as received. > > It was simple enough to repair the seat in the lathe and the results are > shown in the picture labeled "new parts repaired seat". > > The picture labeled "old and new parts" show the old parts in the lower > left and the new parts in the lower right. The old parts had already > been altered from using a rubber X-ring seal to using a teflon seal with > much less friction in the bore of the cylinder attached to the > diaphragm. This had resulted in a decrease in hysteresis from > over 15 psi to about 5 psi. > > When installed on my fuel injector test bench, the old parts as shown > would exhibit the hysteresis and sometimes the fuel pressure would > oscillate turning the pressure gauge needle to a blur going from about > 15 to 60 psi and back very rapidly. > > With the repaired new parts installed and using only the large outer > spring, the fuel pressure was absolutely stable at any pressure I set it > to. When set at 40 psi, the fuel pressure followed manifold pressure > changes applied to the sensing port smoothly with no hysteresis. This > is the result of only a few minutes running on the test bench, but the > improvement in fuel pressure regulation is very marked. If you have the > old style parts in a Mallory regulator and the fuel pressure isn't as > stable as you expect it to be (Bobby?), the repair kit may be something > to consider (assuming they send you usable parts). > > The last picture labeled "assembled regulator" shows the jam nut with a > gasket between it and another nut with a cap welded on it which > eliminated the air leak through the threads of the adjustment rod. > > For what it is worth... > > Steve Boese > --NextPart_Webmail_9m3u9jl4l_7898_1246124866_0 Content-Type: multipart/related; boundary="NextPart_Webmail_9m3u9jl4l_7898_1246124866_1" --NextPart_Webmail_9m3u9jl4l_7898_1246124866_1 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
Thanks Steve.............It never fails to amaze me the ingenuity and = willingness to be of help to
others of the group of all our contributing members................
 
Best Regards, 
--
Kelly Troyer
"Dyke Delta"_1= 3B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifol= d



 
-------------- Original message from Steven Boese <sboese= @uwyo.edu>: --------------


> At the Rotorfest, I showed s= ome data concerning fuel pressure
> instability with my Mallory adju= stable regulator and the improvement as
> a result of installing the= non-adjustable OEM Mazda regulator.
>
> Recently, I noticed = that Mallory came out with a rebuild kit (part#
> 3178) for the 4305= M/4307M regulator which appeared to be a different
> design rather t= han simply replacement parts.
>
> Out of curiosity, I ordered= the kit to see if the regulator would
> actually regulate with the = new parts. The picture labeled "new parts
> bad seat" shows what I r= eceived. The teflon seat looked like it had
> been hacked out with a= dull serrated knife. I coated the ball with a
> magic marker and pl= aced it on the seat so=20the points of contact would
> show up black= in the picture. There was no way that the parts would
> work as rec= eived.
>
> It was simple enough to repair the seat in the lat= he and the results are
> shown in the picture labeled "new parts rep= aired seat".
>
> The picture labeled "old and new parts" show= the old parts in the lower
> left and the new parts in the lower ri= ght. The old parts had already
> been altered from using a rubber X-= ring seal to using a teflon seal with
> much less friction in the bo= re of the cylinder attached to the
> diaphragm. This had resulted in= a decrease in hysteresis from
> over 15 psi to about 5 psi.
>= ;
> When installed on my fuel injector test bench, the old parts as = shown
> would exhibit the hysteresis and sometimes the fuel pressure= would
> oscillate turning the pressure gauge needle to a blur going= from about
> 15 to 60 psi and back very rapidly.
>
> = With the repaired new parts installed and using only the large outer
&g= t; spring, the fuel pressure was absolutely stable at any pressure I set it=
> to. When set at 40 psi, the fuel pressure followed manifold press= ure
> changes applied to the sensing port smoothly with no hysteresi= s. This
> is the result of only a few minutes running on the test be= nch, but the
> improvement in fuel pressure regulation is very marke= d. If you have the
> old style parts in a Mallory regulator and the = fuel pressure isn't as
> stable as you expect it to be (Bobby?), the= repair kit may be something
> to consider (assuming they send you u= sable parts).
>
> The last picture labeled "assembled regulat= or" shows the jam nut with a
> gasket between it and another nut wit= h a cap welded on it which
> eliminated the air leak through the thr= eads of the adjustment rod.
>
> For what it is worth...
&= gt;
> Steve Boese
>
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