Kelly, Looks to me like that’s a
reasonable approach on a six port because I do recall that primary port is
pretty small.
And I have seen one with the secondary’s
combined and that just looked too big for our application. But, I guess as Lynn said if you are
going to buzz up to 10K then that radical porting is good.
My experience has been what is the cat’s
meow for racers generally sucks for our application. My first intake was a
dual throat Webber TB with 4 injectors. Each throat was 2” in dia can
you say runner velocity was low at 4600-4800 rpm. To make a long story short,
aircraft performance and fuel burn indicated I was producing around 133 HP.
When I took that set up off and put
runners of 1 ¼ - 1 ½” dia and the stock smaller Mazda TB my performance
improved to where I could turn 5200 -5400 rpm static with a 2.17 gear box and
68 x72 prop. Of course, going to the turbo block, higher compression .
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Kelly Troyer
Sent: Friday, January 30, 2009
10:35 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] 6 Port 13B
Porting / was Looking for a rear counterweight
I have street ported my 88 13B.......But
only the primary ports (center housing).........It
is correct that you have to be careful not to cut into the EGR passages
that are next to the
ports.............I used the "Mazdatrix" porting
template...........I am including a link to their
how-to site explaining the porting process for the 6 port
13B.............I have no idea if the
trouble was worth the effort yet .............FWIW
--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
-------------- Original
message from "Ed Anderson" <eanderson@carolina.rr.com>:
--------------
Yes, I would no longer consider porting a
six port myself, but back in 92 I knew a bit less about the rotary
engine. Besides, if the rebuilder had either talked me out of it OR had
not charged me for it, the situation would have been a bit different.
I personally prefer the turbo block for
porting myself. I used the Racing Beat Street
port on my turbo block and it really woke it up.
By the way, did Jason get his situation
sorted out?
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On Behalf
Of Bill Eslick
Sent: Friday, January 30, 2009
12:06 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Looking
for a rear counterweight
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
On Thu, Jan 29, 2009 at 8:29 PM, Ed Anderson <eanderson@carolina.rr.com>
wrote:
That's interesting to hear, Bill. My first engine was
an 86 N/A that was suppose to have been street ported (I paid to have it done),
but when I later tore it down, much to my surprise there had been no porting
done. So I ported the next engine myself – at least I got my
money's worth {:>).
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