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#11
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Sticking Lycoming O-360 valve again?
Stop using MV oil and only use Shell single weight and your valve
problems will go away. |
#12
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Sticking Lycoming O-360 valve again?
darthpup wrote:
: Stop using MV oil and only use Shell single weight and your valve : problems will go away. Bzzzt.... Aeroshell 100 or 80 AD since the Aeroshell mineral oil for 25 hours on breakin. -- ************************************************** *********************** * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * ************************************************** *********************** |
#13
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Sticking Lycoming O-360 valve again?
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#15
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Sticking Lycoming O-360 valve again?
George Patterson wrote:
: Well, there you are. Switch to 15W50 and your problems will go away. :-) Why didn't *I* think of that? ;-) -Cory -- ************************************************** *********************** * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * ************************************************** *********************** |
#16
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Sticking Lycoming O-360 valve again?
Mike H wrote:
: Take a good look (or have someone take a good look) at your exhaust system. Our : Archer seemed to have lost power and kept getting worse. Everything seemed normal, : except I'd guess it was lacking 20 - 30 HP, but was using fuel at almost the : 'normal' rate. We finally looked at the exhaust and found that it was coming apart : internally and some of the loose pieces were effectively blocking the exhaust flow. : Since these pieces were loose and moving around, the effect was worse at some : times than others. Had the exhaust system rebuilt and it performs as good as ever... : Mike Pvt/IFR PA28-181 at RYY There's an AD against the exhaust IIRC. I know we've checked it in the past, but it has been awhile.... worth looking into. We very well may have it off if we're messing with the valves anyway... -Cory -- ************************************************** *********************** * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * ************************************************** *********************** |
#17
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Sticking Lycoming O-360 valve again?
Is it rough running at all? or does it feel just weak in general?
Does the EGT behave normally? Your CHTs seem a little high even though they are sparkplug versions. Do you by chance have alcohol in your autofuel? Do a proctology exam on the muffler. Hmmmm. |
#18
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Sticking Lycoming O-360 valve again?
Cory,
26" at 3500 seems a tad low.. Maybe others can chime in on this... Cam problems can result in low manifold pressure, so the plot thickens... Also in case I am misreading, static RPM check R to L is done at full throttle, not at 1800, or whatever you normally use for mag drop... And, it will verify that the impulse pin is releasing properly if they are similar... Seems like you have a good grasp on engines so I don't want to keep throwing out picky stuff... But, once you have the cowl off I would still verify that the butterfly is not loose on the shaft and that it opens fully... You don't happen to have a Precise Flight vacuum system, do you? grasping at straws A fine puzzle we have here... Looks like measuring the cam is next... Cheers ... denny |
#19
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Sticking Lycoming O-360 valve again?
Denny wrote:
: Cory, : 26" at 3500 seems a tad low.. Maybe others can chime in on this... : Cam problems can result in low manifold pressure, so the plot : thickens... I don't remember the altimeter setting that night, but it was pretty clear that day. I'd think it was about 30"... at 1"/1000', that'd be 26.5" theoretical max. The MP is measured at the intake port on #3 cylinder... losing 1/2" through the induction system is normal AIUI. : Also in case I am misreading, static RPM check R to L is done at full : throttle, not at 1800, or whatever you normally use for mag drop... : And, it will verify that the impulse pin is releasing properly if they : are similar... Never done a full-throttle mag check with anything in particular I was search for other than max RPM. What would a full-throttle mag drop tell you? I don't know of anywhere the allowable spec for that is given. The POH specifies at runup RPM, and the TCDS specifies min/max RPM for static... but that's for both mags and mixture leanded for DA. : Seems like you have a good grasp on engines so I don't want to keep : throwing out picky stuff... But, once you have the cowl off I would : still verify that the butterfly is not loose on the shaft and that it : opens fully... Will do once I get the cowling off. : You don't happen to have a Precise Flight vacuum system, do you? : grasping at straws A fine puzzle we have here... Looks like : measuring the cam is next... I was thinking measuring the friction on the valves is probably next. With the covers off the cam measurement may come in. I've talked with my mechanic and he's got a jig and dial indicator rigged up to measure it. Too bad I *ALSO* need to fix the ring gear. I won't be able to spin it up fast to get good lifter inflation. Maybe I can hand-turn it slow enough to keep no inflation? Thanks -Cory -- ************************************************** *********************** * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * ************************************************** *********************** |
#20
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Sticking Lycoming O-360 valve again?
: You don't happen to have a Precise Flight vacuum system, do you?
: grasping at straws Ooops. Nope... plain O-360-A4A. -- ************************************************** *********************** * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * ************************************************** *********************** |
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