---------------------------------------------------------- Engines-List Digest Archive --- Total Messages Posted Tue 11/13/07: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 12:14 AM - List of Contributors (Matt Dralle) 1. 06:42 AM - Re: Lycoming EGT, IO 540 (Gary Casey) 2. 05:21 PM - Raven/Suzuki 1300 (kmccune) 3. 10:12 PM - Re: Raven/Suzuki 1300 (RayStL) ________________________________ Message 0 _____________________________________ Time: 12:14:52 AM PST US From: Matt Dralle Subject: Engines-List: List of Contributors Each year at the end of the List Fund Raiser, I post a message acknowledging everyone that so generously made a Contribution to support the Lists. Its sort of my way of publicly thanking everyone that took a minute to show their appreciation for the Lists. Won't you take a moment and assure that your name is on that List of Contributors (LOC)? As a number of members have pointed out over the years, the List seems at least - if not a whole lot more - valuable as a building/flying/recreating/entertainment tool as your typical magazine subscription! Please take minute and assure that your name is on this year's LOC! Show others that you appreciate the Lists. Making a Contribution to support the Lists is fast and easy using your Credit card or Paypal on the Secure Web Site: http://www.matronics.com/contribution or by popping a personal check in the mail to: Matt Dralle / Matronics PO Box 347 Livermore CA 94551-0347 I would like to thank everyone that has so generously made a Contribution thus far in this year's List Fund Raiser! Remember that its YOUR support that keeps these Lists going and improving! Don't forget to include a little comment about how the Lists have helped you! Best regards, Matt Dralle Matronics Email List Administrator ________________________________ Message 1 _____________________________________ Time: 06:42:43 AM PST US From: Gary Casey Subject: Engines-List: Re: Lycoming EGT, IO 540 Thanks for the replies. The ignition is the Lightspeed Plasma III, which I'm sure you all know is a capacitive discharge wasted-spark system. The "III" as far as I know is sort of a double polarity system that presumably strikes the arc twice, once in each direction. I'm not a fan of CD systems, but I think they work ok - they're just much more electrically complex than an inductive system. I haven't had any luck extracting the advance curve from Claus and I'm not sure why it seems to be a secret. He sells a monitor system that provides a panel readout of advance, but I don't have that. My timing settings were static. I set the mag (no impulse coupling) at 22 degrees and attempted to set the Lightspeed at about the same value. During runup the rpm drops are about equal, confirming that the Lightspeed timing is about the same as the mag. I had no luck trying to rig a timing light to check the advance. I understand that at rpms below something like 2000 there is no "vacuum" advance in the Lightspeed, so it should be producing a spark at the base timing. I should have done mag checks at altitude, but I haven't. My assumption is that at higher rpm and the low manifold pressures at altitude the Lightspeed provides a more advanced timing. Does anyone have information about the advance characteristics of the Lightspeed unit? The "1.5%" I was talking about is the difference in fuel flow between when the leanest and richest cylinders peak. Frank says that his is within 0.5GPH - assuming the fuel flow of the IO360 is about 10GPH that works out to 5% difference, significantly worse that what my engine data indicates. The 1.5% number I stated actually ranged from 0.8% to 3% depending on which of the 10 or so tests I look at. The standard deviation hangs around 0.7% indicating the data is reasonably well behaved. And, while the cylinders were presumably "ported and flow balanced" I have no idea as to whether the air distribution is precise. However, it is unlikely that the air distribution would be poor AND the injectors mismatched to exactly compensate. Therefore, I am reasonably confident that both air and fuel distribution are very close. My next test will be one to determine if the injector atomization plays a part. I plan to do a lean sweep at full throttle followed by another with the throttle closed enough to reduce the manifold pressure by 1 inch. That should be enough to induce at least some air flow through the injectors. Gary On Nov 12, 2007, at 11:56 PM, Engines-List Digest Server wrote: > > Time: 07:44:22 AM PST US > Subject: RE: Engines-List: Re: Lycoming EGT, IO 540 > From: "Hinde, Frank George (Corvallis)" > > Not at all, The EI's will have both less and more advance depending on > manifold pressure. Mags are set at 25deg which is a compromise between > poor starting, high power operation and economy cruise. > > Pretty much all EI's run at about 25 DEG at full power but can advance > to 40deg plus at low manifold pressure. > > I wonder if this engine is truly running balanced...what does "withing > 1.5%" mean?....If it means the cylinders flow the same amount of > air on > the bench then this is meaningless as far as blancing the injectors. > > Each cylinder needs to get to peak EGT at the same fuel flow (mine is > about 0.5GPH between richest and leanest)....Nothing else matters...If > the cylinder don't all peak at the same fuel flow (or close to it) the > engine will not run LOP very well. > > I think what we have here is some cylinders running ROP while the > others > are runnin so LOP that the flame is going out...I.e well LOP. > > > Frank RV7a IO360 > ________________________________ Message 2 _____________________________________ Time: 05:21:36 PM PST US Subject: Engines-List: Raven/Suzuki 1300 From: "kmccune" Hi, I'm building a CH701 and have WW conversion manual, so I'm eagerly waiting for WWs 701 Corvair project results... but I'm still keeping my eyes open for other possible fits for the 701. Does anyone have anything good or bad to say(with explanations) about the Raven 1300 cc Suzuki engine combo? Kevin Read this topic online here: http://forums.matronics.com/viewtopic.php?p=145835#145835 ________________________________ Message 3 _____________________________________ Time: 10:12:05 PM PST US Subject: Engines-List: Re: Raven/Suzuki 1300 From: "RayStL" Hi Kevin, I have a Raven svs1300 redrive Suzuki engine in my CH701. Although I have taxied it, it has not flown. My flight papers should arrive in a couple of days (finally). My first flight will be this weekend. About all that I can tell you now is that it is very smooth running on those engine mounts and with the belt redrive. -- Ray Read this topic online here: http://forums.matronics.com/viewtopic.php?p=145883#145883 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message engines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Engines-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/engines-list Browse Digests http://www.matronics.com/digest/engines-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.