X-CGP-ClamAV-Result: CLEAN X-VirusScanner: Niversoft's CGPClamav Helper v1.23.0 (ClamAV engine v0.103.0) X-Junk-Score: 0 [] X-KAS-Score: 0 [] From: "Matt Boiteau mattboiteau@gmail.com" Received: from mail-lj1-f181.google.com ([209.85.208.181] verified) by logan.com (CommuniGate Pro SMTP 6.3.5) with ESMTP id 30021 for flyrotary@lancaironline.net; Sun, 23 May 2021 16:53:52 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.208.181; envelope-from=mattboiteau@gmail.com Received: by mail-lj1-f181.google.com with SMTP id s25so30845362ljo.11 for ; Sun, 23 May 2021 13:53:51 -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=5CJI9FYfkJ/t1gzmRGwXfaiwmWbFSbWT6ATDHWaQ67w=; b=CUD5iA+OAwk2X5InlHbDuJs4XuXxsivc85g0sLw5d+sczR7CToSV1C6f9MAXAursOM cx/sfZkDfSsPpAHbZFAuQ84g+RatNczc1AzyDrLV5J2e+qE0pdtdGGtvgCVWLRWIIeGc yQP6gK/sTIutkld2+tspQNZnAf0uyghqawUocoo7SzQK6fNdxWUpOw3ldU7YhobbPbPH Wf36j/xI5F+CoE4m/hKYd56bLex9EqZlgC43cdXIeaScobfCwvjLxy5fJrf6fTSxNKHX Ya1YhBgfPoe+xkOjbyLsgulkextuj9oQRNDYzr6/2lHh2jrIRJUdm2NnTp4FTYLXqa6B qNVg== 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=5CJI9FYfkJ/t1gzmRGwXfaiwmWbFSbWT6ATDHWaQ67w=; b=dbd1BlQqmO6w1Gk3ojavJuv5m3daOnn7oAzwK50qfJHAIsaYNVHKT8oK7/UsuZPaG2 IKS9TgHU+lIFk51gFFaZPCoi3CsyeKHrMz0hXAykpyIcDsYsFd68MzmjdlyN51jINK0H qYPu1CedpCMPxJFIAJ2eUUJLLJhkrqIfkwBl3ZyVksS9IuRv8TyslypXo3V9cLGRDdoG U5lyfrPq2UDLFH84cqtN92GxjXbVZqf3v/EHDv3C9oWbW6B+FHe9kD1+6/eBH5O86Oif jY6B6I7iY6vsBEzLRjeoSzLze0M6ZLHzBZOExu1cXEhKqdH3BXOV68ih7ky4H7XwEpOF Dl8g== X-Gm-Message-State: AOAM531gEoEcSF8dcuz6Mt8U4fdGcrUSUQZyDjh6a0zSv/N3NztifuQp qGy1Kb9BtWnm+mwW+8OYe+Gni5Mr3BwEWqsye9UoKvneM+H+MA== X-Google-Smtp-Source: ABdhPJzi8Divazw2xN1BzG9H/7Gea8SBKKSoEszfxZK/AckMBgrUmeiLMGTp5/KTV7RLbpKLEL2RdLRmU2ESxpGGrVs= X-Received: by 2002:a2e:8710:: with SMTP id m16mr14216545lji.165.1621803211488; Sun, 23 May 2021 13:53:31 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Sun, 23 May 2021 16:53:20 -0400 Message-ID: Subject: Re: [FlyRotary] Re: Fwd: PSRU oil pressure To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="0000000000005102c305c3057c35" --0000000000005102c305c3057c35 Content-Type: text/plain; charset="UTF-8" I've always had a crankcase breather filter on the engine, but while I was testing I wanted to see what kind of actual pressures were developed inside the system. It was more a FYI. I guess in my subject I should have clearly stated this is Neils PSRU design. Waiting for Neil to chime in on the difference between his and Tracy's PSRU, but the prop shaft bearings ride on Tapered Roller Bearings. The oil inlet is on the front half with 1/4npt return on the side. There is also a 3/8npt return on the bottom of the rear section. My whole post was basically saying, gravity return isn't enough. The psru still gets pressurized even with the smallest of restriction. Putting a vent line on top, turns into another pressured outlet for the oil to return. Still, a vent line on top I'd recommend to help the returns. I have a temperature prob in the PSRU. I could be wrong, but having the psru gears pressurized would cause more heat? I'll see what the datas shows. - Matt Boiteau On Sat, May 22, 2021 at 12:10 AM David Leonard wdleonard@gmail.com < flyrotary@lancaironline.net> wrote: > Ok, Here is my third comment. Yes you should absolutely vent your > crankcase. In addition to the stock vent located on the oil filler neck, I > also eventually installed an additional 1/2 in. vent. Both of these lines > go through an oil/air separator which is vented in the low pressure > slipstream and drained out the gear leg. And still it is not perfect, but > improved since the early hours. > > As an aside, I can tell you that increased blow-by is usually the first > indication that I am due for an engine rebuild (among several other more > imminent indications like a sudden loss of power). I recommend keeping > track of blow-by (how much oil is caught by the oil air separator). If you > start getting a lot of oil in the can, you will need a rebuild soon. > > Dave Leonard > Turbo Rotary RV-6 > > > On Fri, May 21, 2021 at 6:19 AM Matt Boiteau mattboiteau@gmail.com < > flyrotary@lancaironline.net> wrote: > >> I played around the past few days with oil and psru. I added a psi gauge >> on top of psru,and vented the housing back to the oil dipstick tube. I have >> an oil breather tube from the fill port. We should have a vent on the oil >> crankcase. Without it, I did a pull and turned off the engine and 5psi >> stayed within the system until I cracked open the dipstick to relieve the >> pressure. >> >> On Neil's PSRU, the oil inlet is on the front half. The front drain is on >> the side, which connects to the back drain that is an10, then to the oil >> pan. >> >> Anyways, the stock psru inlet restrictor was 9/64. Once warmed up and >> running at 2200rpm static on the ground, engine oil is about 100psi for me. >> PSRU pressure was about 2.5psi and lots of oil was venting back into the >> oil dipstick tube. I kept on sizing down the restrictor until 1/16th. That >> mostly kept the vent clean and clear of any pressure build up inside the >> psru. >> >> I'm not sure why Tracy recommends having the psru fuel of oil, maybe uses >> different bearings then Neil's? From a truck gear case perspective, plantey >> gears only need a coating of oil, not full and pressurized. I'm probably >> wrong, but throwing it out there. ?.? >> >> - Matt Boiteau >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: >> http://mail.lancaironline.net:81/lists/flyrotary/List.html >> > --0000000000005102c305c3057c35 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I've always had a crankcase breather filter on the eng= ine, but while I was testing I wanted to see what kind of actual pressures = were developed inside the system. It was more a FYI.

I g= uess in my subject I should have clearly=C2=A0stated this is Neils PSRU des= ign. Waiting for Neil to chime in on the difference between his and Tracy&#= 39;s PSRU, but the prop shaft bearings ride on=C2=A0Tapered Roller Bearings= . The oil inlet is on the front half with 1/4npt return on the side. There = is also a 3/8npt return on the bottom of the rear section.

My whole = post was basically saying, gravity return isn't enough. The psru still = gets pressurized even with the smallest of restriction. Putting a vent line= on top, turns into another pressured outlet for the oil to return. Still, = a vent line on top I'd recommend to help the returns.

I have a t= emperature prob=C2=A0in the PSRU. I could be wrong, but having the psru gea= rs pressurized would cause more heat? I'll see what the datas shows.
- Matt Bo= iteau


On Sat, May 22, 2021 at 12:10 = AM David Leonard wdleonard@gmail.com= <flyrotary@lancairon= line.net> wrote:
Ok, Here is my third comment.=C2=A0 Yes you should= absolutely vent your crankcase.=C2=A0 In addition to the stock vent locate= d on the oil filler neck, I also eventually installed an additional 1/2 in.= vent.=C2=A0 Both of these lines go through an oil/air separator=C2=A0which= is vented in the low pressure slipstream and drained out the gear leg.=C2= =A0 And still it is not perfect, but improved since the early hours.
As an aside,=C2=A0 I can tell you that increased blow-by is us= ually the first indication that I am due for an engine rebuild (among sever= al other more imminent=C2=A0indications like a sudden loss of power).=C2=A0= I recommend keeping track of blow-by (how much oil is caught by the oil ai= r separator).=C2=A0 If you start getting a lot of oil in the can, you will = need a rebuild soon.

Dave Leonard
Turbo = Rotary RV-6


On Fri, May 21, 2021 at 6:19 AM Matt Bo= iteau mattboitea= u@gmail.com <flyrotary@lancaironline.net> wrote:
I played around the past few = days with oil and psru. I added a psi gauge on top of psru,and vented the h= ousing back to the oil dipstick tube. I have an oil breather tube from the = fill port. We should have a vent on the oil crankcase. Without it, I did a = pull and turned off the engine and 5psi stayed within the system until I cr= acked open the dipstick to relieve the pressure.
=
On Neil's PSRU, the oil inlet is on the front half. The front drain= is on the side, which connects to the back drain that is an10, then to the= oil pan.

Anyways, the stock psru inlet restrictor was 9/64. Once wa= rmed up and running at 2200rpm static on the ground, engine oil is about 10= 0psi for me. PSRU pressure was about 2.5psi and lots of oil was venting bac= k into the oil dipstick tube. I kept on sizing down the restrictor=C2=A0unt= il 1/16th. That mostly kept the vent clean and clear of any pressure build = up inside the psru.

I'm not sure why Tracy recommends=C2=A0havi= ng the psru fuel of oil, maybe uses different bearings then Neil's? Fro= m a truck gear case perspective, plantey gears only need a coating of oil, = not full and pressurized. I'm probably wrong, but throwing it out there= . ?.?

- Matt Boiteau
--
Homepage:=C2=A0 http://www.flyrotary.com/
Archive and UnSub:=C2=A0 =C2=A0http://mail= .lancaironline.net:81/lists/flyrotary/List.html
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