flyrotary@lancaironline.net Mailing List Archive

Bob,
One thing that everyone should get clear is that for aircraft PPorts are almost always superior. At higher RPMs. Also Pports will idle just fine. Good balance and vibration control are the key to good idle. The engine won't make a lot of power at low rpm but that isn't a problem for an aircraft. The rotary makes a better aircraft engine than a car engine!

Bill Jepson

On Oct 6, 2015 9:14 AM, "Rogers, Bob J." <flyrotary@lancaironline.net> wrote:

You should read the description of the effects of P-porting at this website. See bottom entry. http://www.mazdarotary.net/porting.htm And it is loud!!! See https://www.youtube.com/watch?v=Jebl2pWaiWI

Bob J. Rogers

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Tuesday, October 06, 2015 10:33 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] To P or not...

I understand the benefits of P porting the engine. And I think I know the answer to my question but thought I'd verify.

Looking for 180-200 hp. I have a freshly overhauled 2004 4 port 13b.
If the intake and exhaust are built right I should have no problem getting that power NA.

If I P port the intake it will be easier to make 200 or more. however it is just easier to get air into the engine, and therefore more fuel. But it is not by any means more fuel efficient?

So therefore if I don't need the power I don't need to P port.

Mark

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