Today's Message Index:
----------------------
1. 10:05 AM - Re: cooling cylinder heads s/n 346 3300 (Larry and Dee Pritchard)
2. 11:33 AM - Re: cooling cylinder heads s/n 346 3300 (bob noffs)
3. 03:11 PM - Re: cooling cylinder heads s/n 346 3300 (Peter and Jan Disher)
4. 10:19 PM - Re: cooling cylinder heads s/n 346 3300 (Ivan)
Message 1
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| Subject: | Re: 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
Message 2
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| Subject: | Re: 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
----- Original Message -----
From: Larry and Dee Pritchard
To: jabiruengine-list@matronics.com
Sent: Tuesday, August 26, 2008 12:03 PM
Subject: Re: JabiruEngine-List: 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
Message 3
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| Subject: | Re: 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
----- Original Message -----
From: Larry and Dee Pritchard
To: jabiruengine-list@matronics.com
Sent: Wednesday, August 27, 2008 3:03 AM
Subject: Re: JabiruEngine-List: 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
Checked by AVG - http://www.avg.com
8/25/2008 8:48 PM
Message 4
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| Subject: | Re: 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
----- Original Message -----
From: Larry and Dee Pritchard
To: jabiruengine-list@matronics.com
Sent: Tuesday, August 26, 2008 10:03 AM
Subject: Re: JabiruEngine-List: 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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