From: "Le Roux Breytenbach breytenbachleroux@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: MISTRAL
Date: Thu, 1 Apr 2021 23:35:00 +0200
Message-Id: <DB2BA5ED-6484-46DC-9DA8-A894D38B3E34@gmail.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Check this thread about intake runner lenght,anwers on a lott of 13B engines=
 and intake runner lenght and=20

Sent from my iPhone
Le Roux Breytenbach=20

> On 01 Apr 2021, at 19:23, Charlie England ceengland7@gmail.com <flyrotary@=
lancaironline.net> wrote:
>=20
> =EF=BB=BF4 port or 6 port? It's been a long time since I had the manifold o=
ff the engine, but I *think* my 4 port engine has same size pri & sec ports.=
 I know I used the same size tubing to make the manifold. I believe that the=
 '3rdary' ports on a 6 port are smaller, but I think Steve Boese found that t=
hey don't do anything at our more reasonable rpms.
>=20
> Charlie
>=20
>> On 4/1/2021 12:05 PM, Finn Lassen finn.lassen@verizon.net wrote:
>> Thanks Ed.
>>=20
>> What I meant to say is that Tracy implied that secondary runners should h=
ave a larger diameter.
>>=20
>> But I made them the same (inside diameter) as the holes in the block (30 m=
m).
>>=20
>> Finn
>>=20
>>> On 4/1/2021 11:07 AM, eanderson@carolina.rr.com wrote:
>>> Smaller dia may mean that airflow velocity is higher than in the primari=
es and since the secondary valves open at higher rpms, the higher airflow ve=
locity may help stuff more air into the chamber give the shorter duration th=
e port is open at higher rpm.  Just a WAG.
>>>=20
>>> Ed
>>>=20
>>> ------ Original Message ------
>>> From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net=
>
>>> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
>>> Sent: 4/1/2021 8:48:31 AM
>>> Subject: [FlyRotary] Re: MISTRAL
>>>=20
>>>> Tracy remarked on my secondary runners being smaller diameter than prim=
aries and now I see the same here.
>>>>=20
>>>> If I recall correctly, when I calculated the area of the secondaries vs=
 the area of the primaries (in the engine block) I got smaller secondaries t=
han primaries.
>>>>=20
>>>> What gives?
>>>>=20
>>>> Finn
>>>>=20
>>>> On 3/31/2021 9:44 PM, Kelly Troyer keltro@gmail.com wrote:
>>>>> Primary Runner length approximately........24 inches
>>>>> Primary Runner "OD"  approximately.........1.40 inches
>>>>> Secondary Runner length approximately.....24 inches
>>>>> Secondary Runner "OD" approximately.......1.66 inches
>>>>=20
>>>>=20
>>>>=20
>>>> ---
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>>>>=20
>>>>=20
>>>> --=20
>>>> Homepage:  http://www.flyrotary.com/
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thtml
>>>=20
>>>=20
>>> --=20
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.html
>>>=20
>>=20
>>=20
>> --=20
>> Homepage:  http://www.flyrotary.com/
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>=20
>=20
> --
> Homepage:  http://www.flyrotary.com/
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