---------------------------------------------------------- TeamGrumman-List Digest Archive --- Total Messages Posted Sun 06/23/13: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:18 AM - Re: What Temps should I see? (Gary L Vogt) 2. 11:44 AM - Re: What Temps should I see? (Scott Trejo) ________________________________ Message 1 _____________________________________ Time: 01:18:14 AM PST US Subject: Re: TeamGrumman-List: What Temps should I see? From: Gary L Vogt Ken, I'm not all that convinced Tigers run any hotter than any other air cooled a irplane. In 2004, I installed a JPI analyzer in a 260 Comanche with a 300 hr engine i n place of an EI analyzer. The engine had been built by Lycon. I also clea ned up the baffles and seals. On the first flight, the owner brought it back shortly after take-off saying there was something terribly wrong with the engine cooling; his CHTs were o ver 450 on climbout. I had suspected JPIs indicated higher (more accurate?) f or several years. Both the owner and I went over the entire baffle installat ion and verified everything was tighter than before. In 2007, I upgraded a Tiger to a JPI 700 from an older digital EI analyzer. I installed the EI in my panel next to my JPI. The EI was installed on #3 an d the JPI watched the rest. I used a separate circuit breaker for each unit and used the same engine ground for each. I wrote about it in the AYA Star. Prior to startup, both analyzers read the same. By the time I got to the ru nup, the JPI was as much as 100 degrees higher. In climbout, the JPI was as m uch as 80 degrees higher. Straight and level in cruise, the JPI was 40 to 8 0 degrees higher. I flew both units for over a year. I wrote to Aviation Consumer to see if they would do some research. They ref used. Ken Tunnell at LyCon has had customers complain of CHTs being too high and l ater discover it was a JPI analyzer. In general, keep it under 470 on climbout and expect 410 to 440 in full powe r cruise. If at all possible, run the engine as lean as possible, even expec ting some slight roughness. If you can get it super lean, the CHTs will come down. Don't expect a big drop, just 10 degrees or so. Gary Sent from my iPad On Jun 22, 2013, at 11:27 AM, "Patricia Kirkpatrick" wrote: > Gentlemen (and Ladies too) > > I just had a newly overhauled O-360 installed on my tiger, along with a JP I EDM-900 analyzer. My issue is that I have no reference data to tell how h ot my engine is running. I am aware that Tigers have a reputation for runni ng hot, but my old panel only had an EGT gage. Specifically, what CHTs for c yls 3 & 4 should I expect to see on a newly overhauled ( and thus tight) eng ine during climb and also during cruise? Also, what temps should I expect t o see on those same cylinders during climbs and during cruise after the engi ne is broken in and using detergent oil? I understand climb speeds and ambi ent temps affect the situation to some extent, but some ballpark figures wou ld be nice for a reference. > > Ken Kirkpatrick > N28546 > > > ========================== ========= ========================== ========= ========================== ========= ========================== ========= > ________________________________ Message 2 _____________________________________ Time: 11:44:17 AM PST US Subject: Re: TeamGrumman-List: What Temps should I see? From: Scott Trejo Ken, a good design should yield 385/390 across all cylinders. Sent from my iPhone On Jun 23, 2013, at 3:17 AM, Gary L Vogt wrote: > Ken, > > I'm not all that convinced Tigers run any hotter than any other air cooled airplane. > > In 2004, I installed a JPI analyzer in a 260 Comanche with a 300 hr engine in place of an EI analyzer. The engine had been built by Lycon. I also cl eaned up the baffles and seals. > > On the first flight, the owner brought it back shortly after take-off sayi ng there was something terribly wrong with the engine cooling; his CHTs were over 450 on climbout. I had suspected JPIs indicated higher (more accurate? ) for several years. Both the owner and I went over the entire baffle instal lation and verified everything was tighter than before. > > In 2007, I upgraded a Tiger to a JPI 700 from an older digital EI analyzer . > > I installed the EI in my panel next to my JPI. The EI was installed on #3 a nd the JPI watched the rest. I used a separate circuit breaker for each uni t and used the same engine ground for each. I wrote about it in the AYA Star . Prior to startup, both analyzers read the same. By the time I got to the r unup, the JPI was as much as 100 degrees higher. In climbout, the JPI was as much as 80 degrees higher. Straight and level in cruise, the JPI was 40 t o 80 degrees higher. I flew both units for over a year. > > I wrote to Aviation Consumer to see if they would do some research. They r efused. > > Ken Tunnell at LyCon has had customers complain of CHTs being too high and later discover it was a JPI analyzer. > > In general, keep it under 470 on climbout and expect 410 to 440 in full po wer cruise. If at all possible, run the engine as lean as possible, even exp ecting some slight roughness. If you can get it super lean, the CHTs will co me down. Don't expect a big drop, just 10 degrees or so. > > > > Gary > Sent from my iPad > > On Jun 22, 2013, at 11:27 AM, "Patricia Kirkpatrick" wrote: > >> Gentlemen (and Ladies too) >> >> I just had a newly overhauled O-360 installed on my tiger, along with a J PI EDM-900 analyzer. My issue is that I have no reference data to tell how h ot my engine is running. I am aware that Tigers have a reputation for runni ng hot, but my old panel only had an EGT gage. Specifically, what CHTs for c yls 3 & 4 should I expect to see on a newly overhauled ( and thus tight) eng ine during climb and also during cruise? Also, what temps should I expect t o see on those same cylinders during climbs and during cruise after the engi ne is broken in and using detergent oil? I understand climb speeds and ambi ent temps affect the situation to some extent, but some ballpark figures wou ld be nice for a reference. >> >> Ken Kirkpatrick >> N28546 >> >> >> >> ========================= ========= >> t">http://www.matronics.com/Navigator?TeamGrumman-List >> ========================= ========= >> cs.com >> ========================= ========= >> matronics.com/contribution >> ========================= ========= >> > > ========================== ========= ========================== ========= ========================== ========= ========================== ========= > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message teamgrumman-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/TeamGrumman-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/teamgrumman-list Browse Digests http://www.matronics.com/digest/teamgrumman-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.