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smokyray(at)yahoo.com
Guest

Posted: Fri Sep 28, 2007 7:12 am Post subject: Rocket-List Digest: 6 Msgs -

Jim,



  I trimmed 3" off my lower cowl lip on the standard Harmon cowl. This made my outlet area slightly larger than my inlet area in an effort to help my cowl "draft" a bit better. This lowered all my CHT's by 25-50 degrees and my oil to 185-200 all the time. 

I live where it gets hot and I have never had a temp problem at any power setting. 



Rob Ray



Jim Stone <jrstone(at)insightbb.com> wrote:[quote] --> Rocket-List message posted by: "Jim Stone" 



Good points and most have been considered.

1. Baffles are good.

2.  CHTs only high above 23 inches MAP

3.  Don't know how to measure such an irregular shape such as the cowl 

opening.  I did little to no trimming on John's stock cowl.

4.  Will have a look at the cylinder fins for flashing.

 Thanks,

Jim  Stone

Louisville

UPDATE  CHTs are now staying below 390 deg except for cyl #6 when above 23" 

MAP.  BTW, My oil cooler is aft of #6.  Oil temps are 200 ish and lately a 

bit less.  All indications are that the initial break in has occurred but I 

will continue to run it hard.  Did you know that Lycoming recommends running 

at 24"MAP and 2300rpm and every five minutes advance rpm to max and slowly 

retard to 2200 then back to 2300 and continue this routine for 20 minutes. 

After that, they don't really say.  Check out there videos on the Lycoming 

website under support.

---

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AV8ORJWC

Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"

Posted: Fri Sep 28, 2007 7:24 am Post subject: Rocket-List Digest: 6 Msgs -

Rob, can you post a picture of the final trim appearance?  

   

John Cox  

         

  

From: owner-rocket-list-server(at)matronics.com [mailto:owner-rocket-list-server(at)matronics.com] On Behalf Of Rob Ray

 Sent: Friday, September 28, 2007 8:12 AM

 To: rocket-list(at)matronics.com

 Subject: Re: Rocket-List: Rocket-List Digest: 6 Msgs -   

  

   [quote]Jim,



  I trimmed 3" off my lower cowl lip on the standard Harmon cowl. This made my outlet area slightly larger than my inlet area in an effort to help my cowl "draft" a bit better. This lowered all my CHT's by 25-50 degrees and my oil to 185-200 all the time. 

I live where it gets hot and I have never had a temp problem at any power setting. 



Rob Ray

  [b]

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smokyray(at)yahoo.com
Guest

Posted: Fri Sep 28, 2007 7:43 am Post subject: Rocket-List Digest: 6 Msgs -

Will do...



"John W. Cox" <johnwcox(at)pacificnw.com> wrote:[quote]              Rob, can you post a picture of the final trim appearance?

   

  John Cox

   

        

  From: owner-rocket-list-server(at)matronics.com [mailto:owner-rocket-list-server(at)matronics.com] On Behalf Of Rob Ray

 Sent: Friday, September 28, 2007 8:12 AM

 To: rocket-list(at)matronics.com

 Subject: Re: Rocket-List Digest: 6 Msgs - 

  

   

   	  Quote: 	
		  Jim,    I trimmed 3" off my lower cowl lip on the standard Harmon cowl. This made my outlet area slightly larger than my inlet area in an effort to help my cowl "draft" a bit better. This lowered all my CHT's by 25-50 degrees and my oil to 185-200 all the time.  I live where it gets hot and I have never had a temp problem at any power setting.   Rob Ray    http://www.matronics.com/Navigator?Rocket-List 	
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jrstone(at)insightbb.com
Guest

Posted: Fri Sep 28, 2007 9:47 am Post subject: Rocket-List Digest: 6 Msgs -

Rob,

 Shoot me a pic too.

 Thanks,

  

 Jim Stone

 Louisville

  

 Flight test update.  I hit 200 knots at 1500  feet yesterday and my right gear leg fairing failed, pics  available.

  

 [quote]   ---

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