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oil temps

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HodgeJW(at)aol.com
Guest

Posted: Mon Jun 18, 2007 2:51 pm Post subject: oil temps

The oil temps on my Yak 52 are running pretty high these days. I'm up to 85  C after about 10 min of flying. I am flying it hard (running 85% power and lots  of inverted, outside, and vertical) and It is pretty hot here in southern Ohio  right now, about 91 F today I think. But I would still expect to be running a  little cooler. This winter I sent the cooler off to Pacific Oil Cooler and had  them flush it out and overhaul it, but it didn't seem to make a difference. Any  Ideas?

  

 Thanks

 Jay



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mark.bitterlich(at)navy.m
Guest

Posted: Mon Jun 18, 2007 3:19 pm Post subject: oil temps

This is the kind of data that I think we all need to collect.  Just my

personal opinion.  



Jay, what are your cylinder temps like?  



I have seen two things that seem to control temps significantly.  



1.  Fuel.  When you enrichen the mixture, it will cool the engine a

tremendous amount, and hence will impact oil temp. as well.  

2.  Condition of the piston rings.  The older they get, the more

combustion blow-by gets into the oil and heats it up.  



Lastly, and I hesitate to say this... To each his or her own, but.......

Before I change the oil, I let it get down to about 9 liters or so, and

then add about 3 quarts of MMO.  I run the engine hard around the

pattern for at least 30 minutes being careful to not let the oil

over-temp.  I then drain it all and add new fresh oil.  I also pull the

oil screen and clean it as well when I do this.  



Jay ...  Many may disagree, but I would consider going a few clicks rich

on the main needle and see what it does for you.  Heck, you can always

put it back when you are done.  



Mark Bitterlich

 



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napeone

Joined: 10 Jan 2006
Posts: 36
Location: Birmingham, Al.

Posted: Mon Jun 18, 2007 5:14 pm Post subject: Re: oil temps

Mark

To answer your question, terperature is Alabama hot. Which is to say about 90F plus high humidity. Sigh!

David H.

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HodgeJW(at)aol.com
Guest

Posted: Tue Jun 19, 2007 1:41 am Post subject: oil temps

Mark,

  

 Thanks for the input. My cyl temps are real good. Right in the middle. I  will try going a few clicks rich and see what that does.

  

 Jay



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  [quote][b]

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