X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.3 cv=PbaBeRpd c=1 sm=1 tr=0 a=QFZMRv+ONbu93zBPQV3rYA==:117 a=x7bEGLp0ZPQA:10 a=xXDCcK6TKBsA:10 a=_RQrkK6FrEwA:10 a=zkhEMgEHAAAA:8 a=pGLkceISAAAA:8 a=Ia-xEzejAAAA:8 a=KIDSuHRHEutdCTAftoUA:9 a=jJ64KcHuQc3mOyIs:21 a=XQQJdIFDCxuMZc9d:21 a=QEXdDO2ut3YA:10 a=aiBDVxOD7GZzLnYR_T0A:9 a=zlZNrX1xJCuV6hGr:21 a=mkoNj5Bf86jUksmx:21 a=9GDpmP3Fl05yQITr:21 a=Urk15JJjZg1Xo0ryW_k8:22 From: "Todd Bartrim bartrim@gmail.com" Received: from mail-ot1-f46.google.com ([209.85.210.46] verified) by logan.com (CommuniGate Pro SMTP 6.2.14) with ESMTPS id 544681 for flyrotary@lancaironline.net; Sun, 19 Jul 2020 12:10:38 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.210.46; envelope-from=bartrim@gmail.com Received: by mail-ot1-f46.google.com with SMTP id 72so10397311otc.3 for ; Sun, 19 Jul 2020 09:10:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=eFbn9BTVFmo0lS8uQ6j6dIxwh9WHHKmVAdfOv1nJOW8=; b=pBwDjNgi2Y95qyP8LZ5RiS9aqt1bJ5NJQ+XsN0HDdChPyaYSav8hyJvy0dyQ7ndJ8P 90/OigkfyZvmJ2AG4eOzGFiScI5lIYNSaFHlpJ4+XInVskoMHm6ieQ0lKrmSvf9uPxOG 4kl/JRDdILc5ndsdfgLkvNVTdJsGRkaurpBfAQr6xpt3t7KpG4iAnlJEVPTtSCo6MLjj sW/ADgF9vBl654TAyNc87gKTyonHvlNhk57stlHjlc7ZhESUaWul8UnQtWh9mhzZUKEu BCi9GGe7NycqLFFxfbZnWU1oEy4wjxRaiBEkTW4GhjgVJ/MVdSGIbMODLJmY4ETJHZBU Ku1A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=eFbn9BTVFmo0lS8uQ6j6dIxwh9WHHKmVAdfOv1nJOW8=; b=hy8yF0xZHtdoG4UiGDqtEEWurRS8HgZNm1WXAYwQHKF6cYfUOlmkbWU7ROscLiNfe7 cr+eMlpMeX8jHAjq3hZqQz8k1NqK/lJ9xYaT1N3jG1p/4J72jyIBNO5upxpkdlnHv1Af MQ3zqy0NOBMNmddqOICu1BF17/88MUhUwVg+KPREAG28E01rEC1npWZc9Iy4obV1tL9t 02x4bX6WnXOAleAvKPhkbIDkS0sLDi4jMOLkB10wH35ijdCPNEqf9vPOicXYIBy2YEsG agLW4XyqPnvWSebA9nQsUaPujKr33cUe0LeasFeq6wvj5iqAHc/wrbR6PO+hsDRnup1c tYrA== X-Gm-Message-State: AOAM532gKDbT6/DSynl+VuWEHDOc7zb+E/Srab7HtT7y/+QUtiQYAmHv 0wjVHs/vsSSlEilHk+roLA62VSnAOuzhYuJfx2Y+itg= X-Google-Smtp-Source: ABdhPJyU7IYiHBWAMgkgbEvmvYeFg9u1oLYJLzL4LfUHiTuWO6UHN/CnbrWJz/LlyfRBW27IpGBdTv4qGld6GVw3+9c= X-Received: by 2002:a9d:66cb:: with SMTP id t11mr16226605otm.82.1595175020354; Sun, 19 Jul 2020 09:10:20 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Sun, 19 Jul 2020 09:10:09 -0700 Message-ID: Subject: Re: [FlyRotary] wastegate actuator To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="0000000000007160ff05aacda0f0" --0000000000007160ff05aacda0f0 Content-Type: text/plain; charset="UTF-8" Hi Neil; My old stock diaphragm actuator gave me ~6psi. However when it failed on take off, due to a burst diaphragm, the boost instantly jumped to about 16psi, which was surely an exciting event with very impressive performance. I quickly throttled back before any detonation could occur. I replaced it with this one from eBay https://www.ebay.ca/itm/MAMBA-Adjustable-Turbo-Wastegate-Actuator-For-MAZDA-RX-7-RX7-13B-S4-S5-HT18S-2S/262896884959?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 This is adjustable by changing the springs. And it is a piston so it won't suffer instant failure due to a burst diaphragm. It's failure mode would be due to a worn o-ring on the piston, which would show as slowly degraded control ability and would be a cheap and easy repair. And it will save you 0.3 lbs And it looks way cooler It ships from Taiwan, so it's on the right side of the pond for you. You certainly can use the stock one, but due to it's sealed design, it can't be taken apart to inspect the diaphragm and since it's located right next to an extremely hot heat source it's life time is limited. In my job as an instrument mechanic in a steam plant, I have to repair many automatic valves. We always try to avoid using diaphragm valve actuators in high heat areas, instead opting to use piston actuators. The heat can affect the o-ring on these as well, but the failure doesn't result in complete loss of control for the operator, and even if a proper rebuild kit is not readily available, a generic o-ring can be used or even make one using a splice kit and it will still give years of reliable service in some circumstances. The only advantage to a diaphragm is response speed as it will be slightly more responsive, which could be advantageous in a street racing application, but for our use in aircraft this is of no concern. So, yeah you can use that one, but I recommend the investment in a piston type actuator. Todd Bartrim On Fri, Jul 17, 2020 at 3:44 PM 12348ung@gmail.com < flyrotary@lancaironline.net> wrote: > Group, > > Can anyone tell me what PSI the standard RX7 waste gate > actuator gave? Only need 5 -6 psi and once again why chuck out a unit if > it will do the job?? > > Update on noise, seems just a turbo will not quieten the beast enough for > my liking (an old age thing ?) Have to add another 7 Kg muffler which > will need repacking as it blasts out the packing. Going with AES which is > what Chris Mc Donald used on its own to good effect. By the way FYI Chris > is in Intensive care up north QLD having contacted some disease which has > paralysed him totally. Apparently recoverable in 12 months --- that is a > long time in intensive care. He can now open his eyes, smile slightly and > keep his tongue in his mouth unaided!!! Met him in Caloundra just a few > weeks before he ended up in hospital last Feb. I do not have to point out > the grief this is causing his family. > > So the wastegate actuator --- any info? > > Neil. > --0000000000007160ff05aacda0f0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Neil;=C2=A0
=C2=A0 My old stock diaphragm=C2=A0actu= ator gave me ~6psi.
=C2=A0However when it failed on take off, due= to a burst diaphragm, the boost instantly jumped to about 16psi, which was= surely an exciting event with very impressive performance. I quickly=C2=A0= throttled back before any detonation could occur.
This is adjustable by = changing the springs. And it is a piston so it won't suffer instant fai= lure due to a burst diaphragm. It's failure mode would be due to a worn= o-ring on the piston, which would show as slowly degraded control ability = and would be a cheap and easy repair.
And it will save you 0.3 lb= s
And it looks way cooler
It ships from Taiwan, so it&#= 39;s on the right side of the pond for you.

You ce= rtainly can use the stock one, but due to it's sealed design, it can= 9;t be taken apart to inspect the diaphragm=C2=A0 and since it's locate= d right next to an extremely=C2=A0hot heat source it's life time is lim= ited. In my job as an instrument mechanic in a steam plant, I have to repai= r many automatic valves. We always try to avoid using diaphragm valve actua= tors in high heat areas, instead opting to use piston actuators. The heat c= an affect the o-ring on these as well, but the failure doesn't result i= n complete loss of control for the operator, and even if a proper rebuild k= it is not readily available, a generic o-ring can be used or even make one = using a splice kit and it will still give years of reliable service in some= circumstances.
The only advantage to a diaphragm is response=C2= =A0speed as it will be slightly=C2=A0more responsive, which could be advant= ageous in a street racing application, but for our use in aircraft this is = of no concern.
So, yeah you can use that one, but I recommend the= investment in a piston type actuator.

=
Todd Bartrim


On Fri, Jul 17, 20= 20 at 3:44 PM 12348ung@gmail.com = <flyrotary@lancaironline.= net> wrote:

Group,<= /p>

=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Can a= nyone tell me what PSI the standard RX7 waste gate actuator gave?=C2=A0 Onl= y need 5 -6 psi and once again why chuck out a unit if it will do the job??= =C2=A0

Update on noise,=C2=A0 seems just a turbo will not quieten the beast enoug= h for my liking (an old age thing ?)=C2=A0=C2=A0 Have to add another 7 Kg m= uffler which will need repacking as it blasts out the packing.=C2=A0 Going = with AES which is what Chris Mc Donald =C2=A0used on its own to good effect= .=C2=A0 By the way FYI Chris is in Intensive care up north QLD having conta= cted some disease which has paralysed him totally.=C2=A0 Apparently recover= able in 12 months --- that is a long time in intensive care.=C2=A0 He can n= ow open his eyes, smile slightly and keep his tongue in his mouth unaided!!= !=C2=A0 Met him in Caloundra just a few weeks before he ended up in hospita= l last Feb.=C2=A0 I do not =C2=A0have to point out the grief this is causin= g his family.=C2=A0

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 So the wastegate actuator --- any info?

Neil.

--0000000000007160ff05aacda0f0--