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cooling cylinder heads s/n 346 3300

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larryanddee(at)q.com
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Posted: Tue Aug 26, 2008 9:05 am Post subject: cooling cylinder heads s/n 346 3300

To: Peter/Jan Disher:

  

 I am having CHT problems too and have worked with  the air dams inside the ram air ducts.My heads have 3 small vertical holes  drilled upward from the bottom that intersect a larger 5/8 inch  horizontal hole drilled from the outside of the head that also intersects  the upper cooling fins. I have installed a tube to draw cooling air from UNDER  the head and dump it over board. I MAY install a cooling air line to the 5/8  dia. hole to put more air into the head to help with cooling. I am told the  newer head design does not have these extra holes, what s/n I don't know. I have  installed 8mm ring thermocouples under the head bolt above the spark plugs and  found them to be about 50-60 F degrees lower than the 12mm ring thermocouples  under the plugs, be careful with bolt length! This was NOT a good  test. I am also not happy with the fit of the 12mm rings and the plugs. I  am now using large copper washers under the plugs with the ring thermocouples  between the copper and the head. I also had oil temp problems but seem to be OK  now after three oil coolers and 4 years of work and many failed attempts. I  ended up with a Positech aviation 200003c cooler with a 1 to 3 area ratio. I now  have to worry about low oil temp in the cooler months. 

 I very much want to see more comments on this  problem.

  

 Larry Pritchard, located in Arizona, 100  to  110+ F degrees  

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icubob(at)newnorth.net
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Posted: Tue Aug 26, 2008 10:33 am Post subject: cooling cylinder heads s/n 346 3300

larry,

  consider putting a thermostat in your cooler  lines. below 180 deg. it shunts the oil back to the engine without going thru  the cooler. i have installed one but am not done building yet. others have said  it works well.

                               bob noffs

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pjdisher(at)bigpond.com
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Posted: Tue Aug 26, 2008 2:11 pm Post subject: cooling cylinder heads s/n 346 3300

Hi Larry, I really can't comment at this time for I  haven't flown my bird as yet, also our temp. here in Australia where I live may  get to 100 Deg in summer only gets down to about 60 Deg in winter.

 People here tell me all different things like the  engine will have heating problems and others tell me I won't, they  will be cooling problems, so really I'm not sure what to expect.

 What I have done is allowed ducted cooling air to  the sump that I can control from in the aircraft.

 I hope to be flying soon.

 Pete D

  

   

  

  

  

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imap8ntr(at)cox.net
Guest

Posted: Tue Aug 26, 2008 9:19 pm Post subject: cooling cylinder heads s/n 346 3300

My oil temps in Phoenix reach 224F  on climbout in 90+ degree weather.  I have a J-250 and have had the oil  cooler flange installed as per service bulletin with great success

 Ivan

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