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CHTs
Hello all, I wanted to throw another dumb question out there to see what you all think. I have a pa-22/20 with a 150. I was listening to Mike bush’s latest eaa webinar last week talking about lead fouling. He said the key was to get the chts above 350. Interestingly he also seemed unimpressed with tcp.
We don’t have a Venturi control and I haven’t had much success with trying to play around with Rich or peak/lean of peak. And have been fine just running full rich. I scoped the cylinders and don’t see any signs of lead fouling but couldn’t fish it behind the valves to see what they look like. My engine monitor says I am getting about 265F in the front cylinders and 335 in the rears.
I was curious what others think:
1. How are you all running your engines full rich or lean to the cough and back in, or something more sophisticated? I haven’t had much luck trying to lean with any precision using the little pull knob. I had been thinking running rich was easier and would give me more longevity, and the hours that I fly I wasn’t concerned about save a couple dollars reduce fuel burn by @ few percent. Mike Busch says that thinking is backwards. Run lean of peak and save fuel, reduce fouling.
2. Anyone install a Venturi mixture control to have the precision to play around with this lean of peak/rich of peak stuff?
3. I am not seeing any lead fouling, when I scoped the engine. Is this an issue o-320 tend to have. I don’t recall seeing anyone on here mention it but mike Busch was putting it out there that running a Lycoming cool is likely to result in stuck valves. Should I just ignore mike Busch or am I setting my self up for a day with the rope trick to ream fouled valve guides.
4. Anyone add tcp or use mo gas? Mike was unimpressed with tcp but for low compression cooler running engines why not?if I am at 265/335, I am guessing my wife’s cub is even worse.
Thanks.
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Re: CHTs
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Re: CHTs
Thanks Gilbert, that thread covered most of my questions, ei engine monitors, baffling, temps. I will go experiment with some of those ideas:leaning, and maybe adding some tape to block the #1. I still had two questions for anyone playing with these things.
1. Anyone using tcp or are you just trying to keep engine temps up in the 300’s
2. As for leaning with these new fancy 4 cylinder engine monitors. It is probably user ignorance, but I haven’t been able to figure out how to do it. It seems to me my mixture control is either on or off. I pull, nothing happens, keep pulling nothing happens, and then cough-cough, and I push it back in. I have no idea if I am rich of peak, lean of peak max power. For those of you playing with lop/rop is the stock mixture control precise enough to make the adjustments and pick out those mixtures or did you install a Venturi mixture control, if that’s an option.
Thanks.
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Re: CHTs
Try very slowly inching it out. You probably won’t see any noticeable response until you get just lean of of peak. At that point you should see a slight RPM decrease. Push it back in slowly to recover the lost RPM. That’s where I run it.
My Piper mixture control was very sensitive to movement. I would brace my fingers on the panel and slowly inch it out. I got frustrated with it after I put in the EI UBG16 and installed a vernier mixture control. Problem solved.
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Re: CHTs
Gilbert thanks. That’s what I was thinking. I have been doing to same with my figures on the panel but it’s a pain while trying fly the plain and inch it out a millimeter at a time. Not sure what’s involved with swapping the mixture control but I may look into it.
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Administrator
Re: CHTs
I think if you lean you won't need the TCP. Use to use it in pipe line patrol planes that were running low rpm all day and they fouled plugs regularly.
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Re: CHTs
Using a vernier, I lean in cruise watching the EGT's. Slowly learning, I watch as they go up. As soon as they start to drop I richen the mixture back 50 degrees. This is ROP. I don't think you want LOP in a carbureted engine. My mixture is about an inch or so out.
"You can only tie the record for flying low."
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Re: CHTs
Originally Posted by
Stephen
Using a vernier, I lean in cruise watching the EGT's. Slowly learning, I watch as they go up. As soon as they start to drop I richen the mixture back 50 degrees. This is ROP. I don't think you want LOP in a carbureted engine. My mixture is about an inch or so out.
“As soon as they DROP”.
Isn’t that lean of peak?
That’s the point you start to lose RPM. As soon as you richen up to gain the lost RPM you are back on the rich side.
Last edited by Gilbert Pierce; 08-11-2020 at 11:58 AM.
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Re: CHTs
Thanks for the great comments. I will give it a shot this weekend and report back. Looks like a vernier is in my future too.
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