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Date: Fri, 30 Jan 2009 08:01:10 -0600
Message-ID: <3c14c5540901300601h124e4dbbi581a0b0526d9c2b6@mail.gmail.com>
Subject: Re: [FlyRotary] Street porting
From: Bill Eslick <wgeslick@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Your thoughts are appreciated, as always!

Bill

On Fri, Jan 30, 2009 at 7:56 AM, Lynn Hanover <lehanover@gmail.com> wrote:

> Ed,
>
> I guess you have seen the Mazdatrix web site where they discourage the
> whole porting thing with a 6-port.  Just the opposite of what Lynn
> proposes.
>
> Bill
>
> Well,
> actually I did say that the closing point should not be later than 60-65
> degrees ABDC. And I'm sure that you noticed that the 6 port closes at 70
> degrees. Compared to the Periphery ports 75 degrees or he "J" bridge ports
> (Racing Beat) 72 degrees. So the 6 port is real racy in stock form. And all
> of the talk about not porting the 6 port irons leaves out the point that
> they sell templates to port the 6 port irons. In fact the Owner, Dave Lemon
> races an E Production Mazda convertible with a 6 port engine with irons
> hogged out to form a 4 port engine. And it does suck real bad down low,
> torque wise from low velocity flow. It come on like gangbusters all the way
> up above 10,000 RPM.
>
> So, a 6 port is not really a great choice for airplane use, but it is not a
> disaster like it would be in a street car. The idea is that once it gets up
> to RPM, the effect of late closing is minimized. The run up to RPM would be
> longer than an early closing intake. Like WOT in a panic, but that is not a
> deal breaker. .
>
> The 6 port adds pieces and complexity to an engine few people understand.
> But if you are crazy about rotaries like me, it won't bother you at all.
> Just understand what you have and work with that.
>
> Lynn E. Hanover
>
>

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Your thoughts are appreciated, as always!<br><br>Bill<br><br><div class=3D"=
gmail_quote">On Fri, Jan 30, 2009 at 7:56 AM, Lynn Hanover <span dir=3D"ltr=
">&lt;<a href=3D"mailto:lehanover@gmail.com">lehanover@gmail.com</a>&gt;</s=
pan> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, =
204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div>Ed,<br><br>I=
 guess you have seen the Mazdatrix web site where they discourage the whole=
 porting thing with a 6-port.&nbsp; Just the opposite of what Lynn proposes=
.&nbsp; <br>
<br>Bill<br></div>
<div>&nbsp;</div>
<div>Well, </div>
<div>actually I did say that the closing point should not be later than 60-=
65 degrees ABDC. And I&#39;m sure that you noticed that the 6 port closes a=
t 70 degrees. Compared to the Periphery ports 75 degrees or he &quot;J&quot=
; bridge ports (Racing Beat) 72 degrees. So the 6 port is real racy in stoc=
k form. And all of the talk about not porting the 6 port irons leaves out t=
he point that they sell templates to port the 6 port irons. In fact the Own=
er, Dave Lemon races an E Production Mazda convertible with a 6 port engine=
 with irons hogged out to form a 4 port engine. And it does suck real bad d=
own low, torque wise from low velocity flow. It come on like gangbusters al=
l the way up above 10,000 RPM.</div>


<div>&nbsp;</div>
<div>So, a 6 port is not really a great choice for airplane use, but it is =
not a disaster like it would be in a street car. The idea is that once it g=
ets up to RPM, the effect of late closing is minimized. The run up to RPM w=
ould be longer than an early closing intake. Like WOT in a panic, but that =
is not a deal breaker. .</div>


<div>&nbsp;</div>
<div>The 6 port adds pieces and complexity to an engine few people understa=
nd. But if you are crazy about rotaries like me, it won&#39;t bother you at=
 all. Just understand what you have and work with that. </div>
<div>&nbsp;</div>
<div>Lynn E. Hanover</div>
<div>&nbsp;</div></blockquote></div><br>

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