----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
At 01:42 PM 6/13/01 +0000, bill brown wrote: >----[Please read http://ercoupers.com/disclaimer.htm before following any >advice in this forum.]---- > >Thanks Greg, you make a good point. I'm aware of the issue but my >concern relates to the balance between acceptable oil pressure and an >oil temperature that is high enough to vaporize the moisture in the oil. >I'd rather change oil more frequently than damage the engine with >marginal lubrication at the bearings. My temp stabilizes at about 190 in >acceptable ambients for flying but then my pressure is on the low side. What's 'the low side' mean to you? These old engines don't run the kind of pressures that newer engines do. Around 30 PSI nominal is often just about it. There is also an adjustment for that up on the top of the engine. A spring-loaded device limits the amount of pressure. The spring can get soft. And, the oil pump can get worn as well. What oil are you running in the summer? I get a bit more oil pressure with Aeroshell 100 than I do with multi-vis 20/50. However I tend to stick with the 20/50 except during the real heat of summer, because I still fly on cool late Spring and early Fall mornings and am concerned about the impact of starting with thick oil. I also like that the 20/50 drains out in a more spirited and complete fashion when I change oil. Deep down, I believe that its doing so carries more gunk with it. Of course, that also means that slight leaks are more apparent. >I haven't got the results from my pressure gauge calibration check so I >can confirm that the pressure reading is correct. That's the other thing... ...many Ercoupes have had the oil pressure gauge replaced with one with a larger range. That's because our friends at Stewart-Warner stopped making TSO'd gauges that stop at 60 PSI or so, and now make them around 100PSI (I forget which). Since gauges are really not that accurate at their lower ranges, they're about as useful as an idiot-light. However, Aircraft Spruce and Skyport both sell non-TSO'd Scott gauges that are of lower range and also dirt-cheap. Here in the US-of-A you need a field-approval to use them, but not any more in Canada. For less than you pay for the calibration, you can have a new, nice-looking gauge in the proper range. Alternatively, you can have electronic gauges for very little more. They have the advantage of not having a capillary tube that is vulnerable to breakage (especially the temp gauge when you clean the screen). Basically, every time you disturb any of that stuff you risk messing up and killing either a bulb or capillary tube, and then you're grounded. It's not always your fault... ...eventually vibration WILL kill the capillary tube, and an over-zealous predecessor can toast the bulb on the temp gauge pretty easily. When that happened to me, I was lucky and the local A&P had a 10-year-old-new-in-the-box oil SW temp gauge in a nice low range. I think I got the last one in existence :-) Greg ==^================================================================ EASY UNSUBSCRIBE click here: http://topica.com/u/?aVxiLm.aVzvvT Or send an email To: [EMAIL PROTECTED] This email was sent to: [EMAIL PROTECTED] T O P I C A -- Register now to manage your mail! http://www.topica.com/partner/tag02/register ==^================================================================
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