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CHT temp and ram air duct question

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jeffrey-j-paris(at)excite
Guest

Posted: Thu Jul 12, 2012 1:36 pm Post subject: CHT temp and ram air duct question

Dear List,

   

  I am runnning a Jab 3300 on a Zenith CH601XLB experimental that I built.  The last few years I have been doing my best to get control and manage the cooling of my CHT's.  I'm am getting real close to pretty good temps with the addition of some baffles in my ram air ducts.  Before the baffles my #4 cylinder ran hottest, now that I have that under control my #5 and #6 cylinders are running as hottest almost neck to neck.  Without going into great detail, I am wondering what is the best action to take with what I assume will be to trim the inner ram airduct baffling to increase airflow to these cylinders without hurting the airflow on cylindeers #3 &  #4.

   

  Do I work front to back, or back to front and how much do I take off?  Thanks for your time and consideration.

   

  Jeff Paris 2 Jabs one in a Zentith the other in a Europa.  Rochester NY

   

 [quote][b]

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psm(at)att.net
Guest

Posted: Thu Jul 12, 2012 3:43 pm Post subject: CHT temp and ram air duct question

Hi Jeff,

     

     Just for fun you might try increasing the height of the low baffle     by 1/2 inch or even 1 inch in front of cyl #1 and/or #2.Â  I know     this makes no sense, but it worked for me on a similar setup.Â  I had     no problems at all with 2/4/6 and a nearly never ending battle with     1/3/5.

     

     Paul 

     Camas, WA

     Zodiac XL, Jab 3300 nearing end of phase I testing

     

     

     On 7/12/2012 2:36 PM, Jeffrey J Paris       wrote:

     

     [quote]                Dear List,

                Â 

                I am runnning a Jab 3300 on a Zenith CH601XLB experimental that         I built. Â The last few years I have been doing my best to get         control and manage the cooling of my CHT's. Â I'm am getting real         close to pretty good temps with the addition of some baffles in         my ram air ducts. Â Before the baffles my #4 cylinder ran         hottest, now that I have that under control my #5 and #6         cylinders are running as hottest almost neck to neck. Â Without         going into great detail, I am wondering what is the best action         to take with what I assume will be to trim the inner ram airduct         baffling to increase airflow to these cylinders without hurting         the airflow on cylindeers #3 & Â #4.

                Â 

                Do I work front to back, or back to front and how much do I take         off? Â Thanks for your time and consideration.

                Â 

                Jeff Paris 2 Jabs one in a Zentith the other in a Europa.         Â Rochester NY

                Â 

        	  Quote: 	
		  

	
     [b]

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DaveG601XL

Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh

Posted: Fri Jul 13, 2012 8:49 am Post subject: Re: CHT temp and ram air duct question

Jeff,



What kinds of CHT's are you seeing between climb and cruise?  I can understand why #5 and #6 are the hottest, but are they too hot?  No sense in chasing something if it is in limits.



I guess I was lucky that my CHT's were never really that close to or over the limits during phase 1.  After break-in, when they dropped off a bit, I did some tweaking to get even more margin.  Then I stopped playing with it and concentrated on my EGT for a while.  Now I just fly and review my EMS data every month or so.



Good luck,

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_________________
David Gallagher
Cincinnati, OH area

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