Matronics Email Lists :: View topic

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Super-cool oil temp
Goto page Previous 1, 2

Matronics Email Lists Forum Index -> Yak-List

View previous topic :: View next topic

Author Message

LawnDart

Joined: 05 Jun 2006
Posts: 64

Posted: Mon Jan 22, 2018 6:38 am Post subject: Re: Super-cool oil temp

I have a good chance of getting some of these it I can get the part number.

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

Viperdoc

Joined: 19 Apr 2014
Posts: 484
Location: 08A

Posted: Tue Jan 23, 2018 8:08 pm Post subject: Super-cool oil temp

I split a strip of duck tape in half. I then put the two halves over the length of capillaries on the face of the cooler. I do that when the OAT is going to be less that 40 deg F. Keeps the oil temps in the 50 deg C Range. 



Doc



Sent from my iPad



 	  Quote: 	
		   On Jan 17, 2018, at 12:44 PM, apatton2 <apatton(at)alumni.princeton.edu> wrote:

 

 

 

 Hi All,

 I recently acquired a Yak-50 from the UK (the former G-JYAK). I continue to work on getting it into tune (have replaced the carburetor and mags with overhauled units).

 

 When warm it runs very smoothly and well, developing at least book power (>=8.85 potatoes MP on takeoff). Engine is the stock M14P... only mods are the auto ignition harness and an intake drain kit.

 

 However, the oil temp takes a very long time to come up to 40degC on start. Overnight temps in my area (NorCal) get as cold as 5degC but are generally warmer. However, upon pulling the airplane out of the hangar and starting it, oil temp reads zero C, and will take 20min to get to 40 degC. In fact, after as much at 5min after engine start, the oil temp indicator still indicates 0degC.

 

 This isn't great as I believe that the prolonged run at low power begins to foul plugs. When it's warmed up and motoring at 82% / 7 potatoes in high-power cruise, oil temp needle tends to "stand straight up" at 70-80deg C.

 

 I'm wondering about 2 potential causes:

 1. Is there a variable problem with the indicator? I.e. inaccurate at low power settings/low temps but fine at higher power settings.

 2. Could there be some abnormal oil circulation, especially at low power settings, that is allowing cold oil to stagnate around the temp probe for awhile, even after startup.

 

 Every other indication, as far as I can tell, is normal. CHT temps will come up to ~ 75-100degC while waiting for the oil temp to come up.

 

 Any thoughts would be greatly appreciated.

 Thanks!

 Andrew

 

 --------

 Andrew Patton

 Yak-50

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=477374#477374

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

_________________
Viperdoc

JL2A

Joined: 07 Apr 2015
Posts: 112
Location: Australia

Posted: Mon Feb 05, 2018 7:51 pm Post subject: Re: Super-cool oil temp

I think closing the gill shutters on the ground (at any time) but especially to increase oil temperature is bad advice.



With no airflow over the cylinders the CHT probe is not necessarily telling you the hottest temperature. With stagnant air there could be undected hotspots creating all sorts of ugly things to be happening to the cylinders.



Cooking cylinders to get the oil to warm up a bit quicker could be a pyrrhic victory!



Oil lubricates despite it's temperature - its the high pressure that is the problem and usually only through the oil cooler as the cooling vanes in these are the weakest link with regards to excess pressure. Hoses in correct condition and the engine itself can handle much higher pressures than redline. Try using multi-grade, clicking oil pump PRV down a notch. 



With single weight oils temperature is just a good proxy for pressure.



Stand to be corrected on any of this.

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

Display posts from previous:

	Matronics Email Lists Forum Index -> Yak-List	All times are GMT - 8 Hours Goto page Previous 1, 2
Page 2 of 2

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum