Return-Path: Received: from [205.245.5.173] (account ) by logan.com (CommuniGate Pro WebUser 4.0b8) with HTTP id 1741009 for ; Sat, 21 Sep 2002 19:15:53 -0400 From: "Marvin Kaye" Subject: Re: [FlyRotary] Re: [FlyRotary]Enlarging Trailing spark plug holes To: flyrotary X-Mailer: CommuniGate Pro Web Mailer v.4.0b8 Date: Sat, 21 Sep 2002 19:15:53 -0400 Message-ID: In-Reply-To: <000701c26155$89251b20$6d0140d5@nisses> MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format="flowed" Content-Transfer-Encoding: 8bit Posted for "Martin" : > I can understand the possible blow-by issue on the trailing > plug, but what is the mechanism on the leading plug? Seems > blow-by could occur there also. Thats correct. There is a blowby on the leading plug hole to, but at that state the pressure diference betwen the two cambers are almost zero. And the flame front is no longer spreding out, almost all air/gas mixture is at this state burnt. So there are not the same problem as whit the trailing plug hole. And, regarding to Tracy´s experience: The small hole on the trailing plug hole isn't a problem in the first place. In the small area around the trailing (and leading) plug the will be a pocket of air/fuel mixture. When ignited, the flame is going out thru the hole in the rotor housing igniting the rest of the gas in the rotor recess. So the gases in the recess isn't ignited by the plug itself, but from the flame as a reaction in the spark plug hole. I'm sorry if this sounds confusing, but my English inst the best. Hopefully someone understands and can translate....:-) Regards /Martin SE-FSG