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Cylinder head temps

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cdschieffer(at)msn.com
Guest

Posted: Wed May 14, 2008 6:38 pm Post subject: Cylinder head temps

Hi guys,

 I have about 33 hours flown off of my 40 hours on  my RV-7A at CMA.  I have a Superior O-360 with electronic ignitions and a  Hartzell CS prop with 8.5:1 pistons.  I usually use full power to climb to  1000' then go to 25"/2500 until about 2500' then level off and go to  23:/2350.  My cylinder head temps at 2500' are usually #1 & 2 about 380  to 400 degrees with #s 3 and 4 about 415 to 420 deg on a 70 deg day.  Oil  temp usually stays between 170 and 185.   I was hoping during break-in  the CHTs would drop by this time.  My oil consumption seems to be about  1/4th of a quart per hour so I think the majority of my engine break-in is  done.  I have sealed all the significant holes in the upper cowl pressure  area and are now considering adding the lower cowl louvers to try to get more  CHT cooling.  Any thoughts from you guys who have been down this  road.  

 Thanks,

 Chuck Schieffer

  

   [quote][b]

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kboatright1(at)comcast.ne
Guest

Posted: Wed May 14, 2008 7:22 pm Post subject: Cylinder head temps

Honestly, your temperatures are not bad, and are  certainly not a danger to your engine.  But, since you want to improve  things, how 'bout a little more data?

  

 What climb speed are you using?   I  recommend 120 knots or more unless you've got an obstacle to clear.

  

 What type CHT probes are you using and where are  they mounted (screw-in probe, spark plug ring <top plugs or bottom?>,  etc)?

  

 Do you have a cylinder blocker on #1?

  

 FYI, my 0-320 powered RV-6 typically has a peak CHT  of 400 degrees or so on #3 cylinder during climb out.  Lowering the nose to  achieve 120+ knots lowers it.  On a hot day, #3 may reach 420 or 425.   Before I installed a cylinder blocker on #1, the temperatures on #3 were 25  degrees higher than they are today.

  

 Kyle Boatright

 [quote]   ---

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bicyclop(at)pacbell.net
Guest

Posted: Wed May 14, 2008 10:35 pm Post subject: Cylinder head temps

Chuck,



One thing to think about; when you pull the throttle for your initial 

power reduction,  you come off the carb's enrichener circuit and it runs 

somewhat leaner. This may be contributing to higher CHTs during climb. 

What are your EGTs doing when you pull?



It might be better to leave the throttle forward and come back about 100 

RPM on the prop, if you want to lower the noise level, for climbout 

until you are ready to reduce power for cruise.



That said, the temps do seem a little high for a cool day. Are you sure 

of your ignition timing? As has been said, a little higher climbout 

speed makes a difference in temps, also.



Pax,



Ed Holyoke



Chuck & Deanna Schieffer wrote:

 	  Quote: 	
		   Hi guys,

 I have about 33 hours flown off of my 40 hours on my RV-7A at CMA.  I 

 have a Superior O-360 with electronic ignitions and a Hartzell CS prop 

 with 8.5:1 pistons.  I usually use full power to climb to 1000' then 

 go to 25"/2500 until about 2500' then level off and go to 23:/2350.  

 My cylinder head temps at 2500' are usually #1 & 2 about 380 to 400 

 degrees with #s 3 and 4 about 415 to 420 deg on a 70 deg day.  Oil 

 temp usually stays between 170 and 185.   I was hoping during break-in 

 the CHTs would drop by this time.  My oil consumption seems to be 

 about 1/4th of a quart per hour so I think the majority of my engine 

 break-in is done.  I have sealed all the significant holes in the 

 upper cowl pressure area and are now considering adding the lower cowl 

 louvers to try to get more CHT cooling.  Any thoughts from you guys 

 who have been down this road. 

 Thanks,

 Chuck Schieffer

  

 *

 *

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bobbyhester(at)newwavecom
Guest

Posted: Thu May 15, 2008 3:25 am Post subject: Cylinder head temps

Here is a dicussion on that subject that is ging on over at VAF:

  	  Quote: 	
		  http://www.vansairforce.com/community/showthread.php?t 9981



I see about the same thing and also have a Superior XP-0360

I installed the lower louvers and they did not seem to help much.

I don't use hardly any oil. I have found that the engine oil level likes to stay about 6.5 on the dip stick. If there is more it seems to go away until it gets to 6.5 and then it stays there for a long time.



When I see the CHT's going over 410 I usually level off and pull the throttle back until it comes back down then continue my climb.

----

Surfing the web from Hopkinsville, KY

Visit my flying RV7A web page:

http://home.newwavecomm.net/bobbyhester/MyFlyingRV7A.htm



	
 

 

 Chuck & Deanna Schieffer wrote: [quote]            Hi guys,

   I have about 33 hours flown off of my 40 hours on my RV-7A at CMA.  I have a Superior O-360 with electronic ignitions and a Hartzell CS prop with 8.5:1 pistons.  I usually use full power to climb to 1000' then go to 25"/2500 until about 2500' then level off and go to 23:/2350.  My cylinder head temps at 2500' are usually #1 & 2 about 380 to 400 degrees with #s 3 and 4 about 415 to 420 deg on a 70 deg day.  Oil temp usually stays between 170 and 185.   I was hoping during break-in the CHTs would drop by this time.  My oil consumption seems to be about 1/4th of a quart per hour so I think the majority of my engine break-in is done.  I have sealed all the significant holes in the upper cowl pressure area and are now considering adding the lower cowl louvers to try to get more CHT cooling.  Any thoughts from you guys who have been down this road.  

   Thanks,

   Chuck Schieffer

    

    	  Quote: 	
		  



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