---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Thu 12/25/14: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:45 AM - Re: Engine boosting (rampil) 2. 09:52 AM - Re: Re: Engine boosting (William Daniell) ________________________________ Message 1 _____________________________________ Time: 07:45:31 AM PST US Subject: RotaxEngines-List: Re: Engine boosting From: "rampil" Rob is exactly correct. Compression always increases energy, in this case heat. For a given compression ratio, there will always be the same increase in heat energy and if starting from the same temperature, always ending at the same higher temperature irrespective of fan blade design. As for "Flygas", not in my airplane! There's something reassuring about ground up system design and review of all affected parts in terms of flight reliability. Happy Holidays and Safe Flight! -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=436250#436250 ________________________________ Message 2 _____________________________________ Time: 09:52:24 AM PST US Subject: Re: RotaxEngines-List: Re: Engine boosting From: William Daniell Where I live in Colombia they developed a turbo for the stock 912 before the 914 came out. It uses a Mitsubishi turbo with the standard carbs albeit adjusted. I hear that you can get 39" but I only use 33" but given that I fly out of SKGY MSL 8500 this gives 500' minute performance with two adults aboard my ICPStol. The system is pretty much what you would imagine with the four exhausts feeding the turbo which has the standard vehicle blow off valve but with a weaker spring than the vehicle one. I had manual adjustment with a vernier for a while which also worked fine but added work. The cold side feeds an airbox which feeds the carbs. I like this set up and I have flow nearly 500 hours on it without a problem except once when I fitted normal paper carb bowl gaskets which let in air and high MP. Cork gaskets solved the problem. I had an engine tear down by a rotax certified mechanic at 500 hours and all tolerances where within spec. A lot of people use this set up here and I have never heard of any problems except when the boost is set too high 40" +. In fact due to the complexity of the 914 in many ways it seems a more reliable option. Will William Daniell LONGPORT +57 310 295 0744 On Thu, Dec 25, 2014 at 10:43 AM, rampil wrote: > > Rob is exactly correct. Compression always increases energy, in this > case heat. For a given compression ratio, there will always be the same > increase in heat energy and if starting from the same temperature, > always ending at the same higher temperature irrespective of fan blade > design. > > As for "Flygas", not in my airplane! There's something reassuring about > ground up system design and review of all affected parts in terms of > flight reliability. > > Happy Holidays and Safe Flight! > > -------- > Ira N224XS > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=436250#436250 > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.