Return-Path: Received: from [65.33.166.167] (account ) by logan.com (CommuniGate Pro WebUser 4.0b7) with HTTP id 1735048 for ; Tue, 17 Sep 2002 00:36:21 -0400 From: "Marvin Kaye" Subject: Re: [FlyRotary]Re: 13B for sale To: flyrotary X-Mailer: CommuniGate Pro Web Mailer v.4.0b7 Date: Tue, 17 Sep 2002 00:36:21 -0400 Message-ID: In-Reply-To: <001501c25df9$64d02e40$284ffea9@suwanneevalley.net> MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format="flowed" Content-Transfer-Encoding: 8bit Posted for "Tracy Crook" : Mazda had a good reason for making the trailing plug hole smaller. The differential chamber pressure between two adjacent rotor chambers is at its greatest when the apex seal crosses that hole . Under certain conditions, a larger hole can cause the 'trailing' chamber to pre-ignite, not a good thing. There may be some conditions (in racing applications) where the engine may make a very small amount of additional power with the trailing plug hole enlarged, but in no way can this mod be called an enhancement to reliability. Tracy Crook tcrook@rotaryaviation.com www.rotaryaviation.com