flyrotary@lancaironline.net Mailing List Archive

Another thing to remember is that very few 20Bs were N/A in standard automotive use. The 20B will produce nearly 300 HP normally aspirated at less than 7000 RPM. Al Gietzen dynoed the 20B he put in his cozy and with a fairly restrictive exhaust it made 285 at 68 or 6900 RPM. With a 2.85:1 redrive and any slight flow improvement it would best 300. Another real plus is that the engine is not at all highly stressed at that output.
Bill Jepson

-----Original Message-----
From: cbeazley <cbeazley@innovista.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tue, 5 Feb 2008 12:00 am
Subject: [FlyRotary] Rotor Identification / 20B NA

Hi Bob;

Meant to mention a few more HP options - mild street port and extended street port are also good options if the engine is already apart.
Here are a few web sites with pics of various port types - don't believe everything that is written - particularly idle RPMs.
http://www.turborx7.com/portingpictures.htm
http://www.mazdarotary.net/porting.htm

Cheers
Cary

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