From: "Charlie England ceengland7@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: MISTRAL
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Date: Thu, 1 Apr 2021 12:26:03 -0500
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4 port or 6 port? It's been a long time since I had the manifold off 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 they don't do anything at our more reasonable rpms.

Charlie

On 4/1/2021 12:05 PM, Finn Lassen finn.lassen@verizon.net wrote:
> Thanks Ed.
>
> What I meant to say is that Tracy implied that secondary runners 
> should have a larger diameter.
>
> But I made them the same (inside diameter) as the holes in the block 
> (30 mm).
>
> Finn
>
> On 4/1/2021 11:07 AM, eanderson@carolina.rr.com wrote:
>> Smaller dia may mean that airflow velocity is higher than in the 
>> primaries and since the secondary valves open at higher rpms, the 
>> higher airflow velocity may help stuff more air into the chamber give 
>> the shorter duration the port is open at higher rpm.  Just a WAG.
>>
>> Ed
>>
>> ------ 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
>>
>>> Tracy remarked on my secondary runners being smaller diameter than 
>>> primaries and now I see the same here.
>>>
>>> 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 than primaries.
>>>
>>> What gives?
>>>
>>> Finn
>>>
>>> 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
>>>
>>>
>>>
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