KR> 14.7 AFR gauges
Mark L. If you were going to have only one EGT probe on a Corvair engine, which cylinder would be the most beneficial to place it on? I still have some of the one cyl EGTs and see some for sale occasionally really cheap. When I first started flying in 1969 (dinosaur days) most private planes did not have EGTs, just the cool guys were starting to have them and then usually only one probe/cylinder EGTs. Alcor was the best at the time and then later developed the first multi cyl EGTs that I remember. Those gages had one needle readout and a dial to switch to 4 different probes/cylinders. The pilot could only see a readout on one cylinder at a time, dial, see cyl #1, dial see cyl #2 etc. If you developed a problem on a cylinder that you weren't switched to then you missed it, unless something bad happened of course. Things have changed dramatically since those days thank goodness. Larry H.
KR> 14.7 AFR gauges
Craig Williams wrote: >>Maybe this is not for me after all. My plan is to run a six into six >>exhaust. EGT may be easier and cheaper if I do that. I didn't say it wouldn't work on just one cylinder, just that most applications try to cover as many cylinders as possible, probably to get the best overall gas sample for the highest quality reading. I have no doubt that reading only one cylinder would yield useful information. Mark Langford ML at N56ML.com website at http://www.N56ML.com
KR> 14.7 AFR gauges
--- On Thu, 1/27/11, Mark Langford wrote: > From: Mark Langford > Subject: Re: KR> 14.7 AFR gauges > > I don't know of anybody that only monitors one > cylinder. Mine measures > three, Joe Horton has two, with each measuring three, all > automobiles > measure all cylinders at once downstream. > OK, that makes sense. Maybe this is not for me after all. My plan is to run a six into six exhaust. EGT may be easier and cheaper if I do that.
KR> 14.7 AFR gauges
Craig Williams wrote: >>1. With EGT we normally monitor all cyl but with AFR we are typically >>only monitoring one. Is there a chance you could run one of the other >>cylinders too lean and burn a valve? I don't know of anybody that only monitors one cylinder. Mine measures three, Joe Horton has two, with each measuring three, all automobiles measure all cylinders at once downstream. >>2. Would you want to adjust the mixture on takeoff by this gauge to >>maximize HP? You want to take off with the mixture a tad rich to minimize the possibility of detonation, and for max power. It won't take you long to figure out where the mixture meter needs to be set to get that. On my AFR gauge that's with the second LED from the top lit, and the top one no lit. >>3. Once leaned to 14.7 afr is there any reason other than an altitude >>changes to touch it? With my Ellison (and I'm guessing most other carbs) a change of throttle setting will also change the mixture. I adjust my mixture quite often while flying, especially after initial climbout, as I climb through 5000' feet or so, and then when I'm at final cruise altitude and have backed off to cruise rpm (about 3050, most of the time). And not just to 14.7:1, but far below that, with only the lowest LED blinking occasionally. There's more on that at http://www.n56ml.com/corvair/o2meter/ . Mark Langford ML at N56ML.com website at http://www.N56ML.com
KR> 14.7 AFR gauges
Well thank you Sid! Ever since I came to see you last weekend I have been pondering the AFR gauge. Although I can't use the nice bright laser red unit you have because my cockpit is being done in a military style (black face gauges with white needles) I am hooked on the idea and will install one of these gadgets once I find one that can works for my style. But I have a few questions I hope someone can answer. 1. With EGT we normally monitor all cyl but with AFR we are typically only monitoring one. Is there a chance you could run one of the other cylinders too lean and burn a valve? 2. Would you want to adjust the mixture on takeoff by this gauge to maximize HP? 3. Once leaned to 14.7 afr is there any reason other than an altitude changes to touch it. Thanks again Sid for spending so much time showing me you plane. Hope mine is half as nice. Craig
