---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Sat 03/29/14: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:09 PM - Re: Coil lead Conversion (DaBear) 2. 07:16 PM - Side Exhaust (DaBear) ________________________________ Message 1 _____________________________________ Time: 07:09:10 PM PST US From: "DaBear" Subject: RE: Yak-List: Coil lead Conversion I've been trying to post a couple messages since last Sunday. They are sent via email, no error messages, but never show up on the yak list. Did the test, so I'm using the same subject line to try this reply. Sorry for hijacking the thread.... Pilots, Id recommend that everyone take a hard look at how you monitor your engine. I know the Housai and the M14P(PF etc.) are strong engines and take some abuse. However, it would help the life and performance of the engine if we did a little better at monitoring. Ive been testing a system http://www.thenewskyview.com/ that lets me see EGT/CHT of all 9 Cyl and then I can track it on the SAVVY website https://www.savvyanalysis.com/home to see trends over a single flight and multiple. I now have data for all my flights for the last year. Why is it important. Well, seeing the data on a regular basis can help understand what the engine is doing when it is running right, and when something is wrong. For instance, if you leave the prime knob cocked over youll see extremely low CYL temp on #9 Cyl. Just #9. If you leave the intake drain open youll see the effect on the CHT and EGT. Have a bad Cyl, Plug, wire; youll know exactly which one even if the engine doesnt run rough. Wait you say, how can a plug be bad and the engine not run rough. Well, I put in a new engine (well, 300 OH/zero time new to me) on my CJ. The engine ran fine. However I saw low CHT on 2 different CYL. Thought it was a probe/sensor. Nope it wasnt. Changed probes, sensor wires, etc. Still it ran fine, but showed the same 2 CHTs low. 80-90 deg F lower than the hottest CHT. Changed out the plugs, and bam Im back within 40 deg F. While the engine ran fine, I cant say it was good for the Cyl to do that, nor for peak performance. With the standard system you only see 2 different CYL (1 on the front indicator and a different one on the back cockpit indicator). Also, run up is easy. I run RPM up to run up, then switch to Mag 1, if all EGTs rise, I know each plug is firing well on that mag. Switch to both, then over to 2, if all EGTs rise, All is good. It takes just a second to see if on the screen and if something is wrong, I see it instantly. A couple of years ago on my old engine, the run up on the ground was fine. But when I climbed up to 8-9k it would have problems that I didnt see/feel. How do I know? The engine monitor showed that a couple of the CHTs were off at altitude and when doing a mag check at Alt, showed multiple EGTs lowered (bad). Well, I replaced the original wires with the Auto Plug Conversion and it fixed the issue. Now some folks I know with CJs are using a 9 Cyl engine monitor (little round gauge). But do you actually use it? Please make sure you understand it and what the engine is telling you. Find a system that works for you, understand it, and use it. Point is, we use good quality oil, oil filters, and other things to care for our airplanes and engines. Will it save you money after install? I cant tell you that but I hypothesize that it would the first time you have a problem with the engine OR if you run LoP on the Housai. My opinion is that it is worth knowing. You make the decision for you. Thanks for reading this far. Bear ________________________________ Message 2 _____________________________________ Time: 07:16:28 PM PST US From: "DaBear" Subject: Yak-List: Side Exhaust Yup, it is me again. I promise, last rant of the day. Well, I hope. Anyway, wanted to talk about the side exhaust that some people have on their CJs. Note: I owned 1 for a couple of years and a couple of hundred hours. I liked it. It sounded better but was extremely loud in the cockpit. Without ANR the sound was unBEARable [sic] [pun intended]. I still liked it. When flying airshows, the crowd liked the noise. However there are some other drawbacks with the system that you should know about if you have it or want to install it. 1. It is a long, vibrating, metal tube that hangs on your engine Cyl. 2. It will occasionally need welding at the joints due to above 3. You CAN NOT mount/attach the back end to your airplane it makes cracking worse. 4. It WILL burn/rub against the side of your CJ where it comes out from the engine compartment 5. Even if you add a SS plate, it will burn/rub against it. Check behind the exhaust after 100 hours. 6. You need to insure that the donuts and connection nuts (rings) are tight on the CYL exhaust ports. You should check with a wrench every couple of hours. If you dont as the exhaust vibrates it loosens. it changes the shape of the donut and then begins to grind the CYL. I didnt check it as often as I should and after about 700 hours at least 6 of my CYLs would need to be fixed. To number 6 above, you should do that for the standard exhaust as well and is extremely important. Im NOT trying to bad mouth the side exhaust. It is cool, it is loud, I LIKED IT! However, if you have it, it needs to be watched, it needs a little more maintenance than the standard exhaust. I raise this issue along with others because as a community we need to keep talking about what we are seeing. We need to be honest and help the folks that have been in the community a while along with those new to keep flying safe. I offer it as my opinion, you decide on what is good for you. Respectfully, Bear ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-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/yak-list Browse Digests http://www.matronics.com/digest/yak-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.