Skybrd Posted October 30, 2010 Report Posted October 30, 2010 I have a 1964 M20E with about 600 smoh. My number 2 cylinder is running hotter (EGT) than the others and notice the cylinder leak down checks show this cylinder leaking more that the others ( with 68/80). Have any of you noticed your number 2 cylinder doing the same. Is there something that would make that cylinder run hotter? Also notice my oil temp reads about 200 degrees at cruise, is that what yours normally show?
robert14 Posted October 30, 2010 Report Posted October 30, 2010 I have a 1965 M20E. Cylinder head #2, front left, has always been the hottest cylinder head on my plane. A friend of mine also has a 1965 M20E. His number 2 is also the hottest. I recently added the Mooney SB M20-182-000 kit to my plane. It brought #2 and 4 down by about 25 deg and number 4 down about 50 deg. It brought my oil temp down 30 deg. I do not know why #2 runs hottest. During climb-out with wot and 2700, my max CHT is CHT #2 at 380 deg. My max oil temp is 205 deg on my EDM 700. Hope that helps.
robert14 Posted October 30, 2010 Report Posted October 30, 2010 With regards to cruise, I was running oil temps of 225-230 deg on the EDM 700 at wot and 2500 (205 deg on the factory guage) before I added the Mooney M20-182 kit. I now run at 200 deg or less on the EDM 700 oil temp during cruise. The kit cost me $240 with overnight delivery. Takes about 6 hours to install.
scottfromiowa Posted October 30, 2010 Report Posted October 30, 2010 '66 M20E GEM 602 always shows EGT and Cylinder temp slightly elevated in number 2. I always attributed to the stock probe being on this cylinder and positioning the GEM probe in a different position. I guess I will have to check out SB M20-182-000....
rbridges Posted October 30, 2010 Report Posted October 30, 2010 that's odd. my EGT shows the #2 cylinder running much cooler than the others. Maybe it's a carburetor vs. fuel injection issue. my plane has a 201 cowl, also, and that may change air flow.
Skybrd Posted October 30, 2010 Author Report Posted October 30, 2010 Quote: robert14 I have a 1965 M20E. Cylinder head #2, front left, has always been the hottest cylinder head on my plane. A friend of mine also has a 1965 M20E. His number 2 is also the hottest. I recently added the Mooney SB M20-182-000 kit to my plane. It brought #2 and 4 down by about 25 deg and number 4 down about 50 deg. It brought my oil temp down 30 deg. I do not know why #2 runs hottest. During climb-out with wot and 2700, my max CHT is CHT #2 at 380 deg. My max oil temp is 205 deg on my EDM 700. Hope that helps.
robert14 Posted October 31, 2010 Report Posted October 31, 2010 For details on Mooney Servive Bulletin m20-182, go to www.mooney.com and look under service bulletins. SB M20-182 is on page 2. The PDF file describes all the details of the kit and how to incorporate it.
robert14 Posted October 31, 2010 Report Posted October 31, 2010 The 201 cowl completly changes the air flow. SB M20-182 only applies to the factory cowl for the M20E and M20F.
robert14 Posted October 31, 2010 Report Posted October 31, 2010 Whoops, SB M20-182 is discussed on page 3 of the SBs on the Mooney site. Sorry about the wrong page call-out on my earlier post.
danb35 Posted October 31, 2010 Report Posted October 31, 2010 My cyl #2 also runs hottest in CHT, by 30-40 degrees compared to #3 and #4 (#1 reads about 100 degrees lower, but it has a different type of probe that I suspect contributes to that). EGTs are pretty much meaningless except in relation to peak EGT for that cylinder--it doesn't matter if one cylinder runs 100 degrees hotter or colder than another, though it does matter that they peak at close to the same fuel flow. The compression doesn't necessarily sound like a problem, though that depends on whether the leakage is past the rings or the valves (which would usually mean the exhaust valve). If the former, no big deal. If the latter, it indicates that repair work will be needed at some point, though I wouldn't think there's any real hurry.
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