From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Renesis primary iintake ports circumerence
Date: Tue, 22 Dec 2020 11:58:58 +0800
References: <list-1058861@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-1058861@logan.com>
Message-Id: <21BE3893-B7F6-4F31-B761-89BEA8B70DE8@gmail.com>

Hi Finn

Yes. That=E2=80=99s why I ended up with the 32mm ID Primaries. It was =
the best I could find and when squashed, that tube fit the primary =
intake shape pretty well.
I tried to keep the dynamic effects of the OEM manifold (shortened to =
lift peak torque and dynamics up to 6000 and 7200rpm), but if I was to =
rebuild, I think I would just have clean runners as Tracy opted for into =
a plennum chamber.
Tracy wrote that his 4 port was producing 215hp @ ~21g/hr from memory =
which is better than we are seeing.

Steve


> On 22 Dec 2020, at 10:45 am, Finn Lassen finn.lassen@verizon.net =
<flyrotary@lancaironline.net> wrote:
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> Thanks Steve.
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> 1/8" wall is a bit too heavy for me. 1 mm or 0.04" would be more to my =
liking.
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> Looking at at manifold drawing it looks like I need 33.5 mm (1.319") =
ID tubing.
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> Seems the closest I can get is 1.5" OD with 0.049" wall. 35.6mm ID.
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> What I really need is 1-3/8" OD and 0.028" wall but have not been able =
to source that.
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> I might end up just wrapping existing runners with more =
fiberglass/epoxy.
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> Finn
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> On 12/21/2020 9:11 PM, Stephen Izett stephen.izett@gmail.com wrote:
>> Hi Finn
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>> My notes show (from measurements of hem intake) that the Renesis 4 =
port primary and secondary runners are 30mm diameter.
>> I used the original secondary runners after cutting and turning the =
manifold ~180 degrees.
>> I used 32mm ID aluminium tube with a 3mm wall thickness for the =
Primaries.
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>> Steve Izett
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>>> On 22 Dec 2020, at 9:56 am, Finn Lassen finn.lassen@verizon.net =
<flyrotary@lancaironline.net> wrote:
>>>=20
>>> Couldn't understand why it kept "idling" at higher and higher RPMs =
(3,500 at the end and had to cut fuel and turn off the EC3 to shut it =
down).
>>>=20
>>> I had made the primary runners from the plenum to the intake ports =
with 0.016 alum rolled and covered with fiberglass and epoxy on the =
outside. Seemed a simple way to go from oval at the port/manifold to =
round in the plenum.
>>>=20
>>> Obviously I completely underestimated the amount of vacuum that the =
engine can pull or pump. Perhaps if I had added multiple layers of =
fiberglass ...
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>>> So I need to use thicker tubing or pipe.
>>>=20
>>> Anyone here that can remember the size of tubing they used? (OD/ID =
and or thickness)
>>>=20
>>> Finn
>>>=20
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>>>=20
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