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  #61  
Old 11-29-2021, 11:24 AM
rockwoodrv9 rockwoodrv9 is offline
 
Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
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I am learning from this thread. I have been going over my flight data and seeing my oil temp is not going over 135 though my cylinder temps are in the 370-400 range and exhaust temps up to 1480 at peak, mostly around 1400.

I preheat my engine overnight like this photo and I get the oil to about 75 and the carb to about 90.

I can see the oil needs to get hotter but my exhaust temp is as high as I want it to go. My thought is to cover part of the oil cooler or plug the blast tube on it but I dont want the other temps to go up.

Am I over focused on the exhaust temp?
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  #62  
Old 11-29-2021, 12:54 PM
KayS KayS is offline
 
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rockwood: place your EGT probes 2" lower on the exhaust pipes to solve your high exhaust temp problem.

your CHT's and Oil temps matter, EGT's shouldn't.

Last edited by KayS : 11-29-2021 at 12:56 PM.
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  #63  
Old 11-29-2021, 01:22 PM
rockwoodrv9 rockwoodrv9 is offline
 
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Thanks. That makes me feel a bit better. I was using them to help me lien the engine.
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  #64  
Old 12-09-2021, 06:36 AM
rockwoodrv9 rockwoodrv9 is offline
 
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I am ok in the pre heat but having trouble getting the oil up to temp in flight. After an hour flight the max the oil got was 131degrees. My plan is to put aluminum tape over the outside of the oil cooler. Iím sure putting it on the inside of the plenum would be better but thought I would try this first. Is there a reason to not try this? I tried taping the front of the plenum holes 1/3 and it increased the CHT but did nothing for the oil. Any thoughts?
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  #65  
Old 12-09-2021, 08:01 AM
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MacCool MacCool is offline
 
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Quote:
Originally Posted by rockwoodrv9 View Post
I am ok in the pre heat but having trouble getting the oil up to temp in flight. After an hour flight the max the oil got was 131degrees. My plan is to put aluminum tape over the outside of the oil cooler. Iím sure putting it on the inside of the plenum would be better but thought I would try this first. Is there a reason to not try this? I tried taping the front of the plenum holes 1/3 and it increased the CHT but did nothing for the oil. Any thoughts?
With exhaust gas temperature, I think what matters is not the actual number but the trend. I've been told that using EGT for anything other than finding the peak temp and adjusting mixture rich or lean from there is the not very useful.
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  #66  
Old 12-09-2021, 09:00 AM
rockwoodrv9 rockwoodrv9 is offline
 
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Quote:
Originally Posted by MacCool View Post
With exhaust gas temperature, I think what matters is not the actual number but the trend. I've been told that using EGT for anything other than finding the peak temp and adjusting mixture rich or lean from there is the not very useful.
Thanks. I agree - Im not to worried about the exhaust gas temp but I want to make sure I can keep the oil temp high enough. I hoped putting the tape on the outside of the oil cooler would help so I didnt have to take off the plenum to cover the inside.

You are in cold town USA so how do you keep your engine oil hot enough? Im having trouble betting to 120-130.
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  #67  
Old 12-09-2021, 11:18 AM
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Vlad Vlad is offline
 
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Quote:
Originally Posted by rockwoodrv9 View Post
I am ok in the pre heat but having trouble getting the oil up to temp in flight. After an hour flight the max the oil got was 131degrees. My plan is to put aluminum tape over the outside of the oil cooler. I’m sure putting it on the inside of the plenum would be better but thought I would try this first. Is there a reason to not try this? I tried taping the front of the plenum holes 1/3 and it increased the CHT but did nothing for the oil. Any thoughts?
Get that nice plenum off and tape inside the cooler. Completely. You would be pleasantly surprised what it does. When it's very cold tape both sides.

Tape at the back as shown will eventually peel off due to a lot of air pushing on it.
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  #68  
Old 12-09-2021, 12:35 PM
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jcarne jcarne is offline
 
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I agree with Vlad. I have a cable actuated shutter on the front of the cooler and this time of year it is almost completely shut all the time.
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  #69  
Old 12-09-2021, 12:40 PM
larryMar larryMar is offline
 
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Location: C77, Il
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As a reference: I have a good cowled airplane and always have cool - cold CHT. I tape almost 100% of the cooler almost all winter. Live in the Chicago area. I fly south just N of Atlanta before I stop for fuel, and I take the tape off then.
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  #70  
Old 12-09-2021, 01:20 PM
rockwoodrv9 rockwoodrv9 is offline
 
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Ok, I was lazy but I will tape the inside! Ha!
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