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way to cool cylinder head temps

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davemader(at)bresnan.net
Guest

Posted: Fri Jan 06, 2006 10:05 am Post subject: way to cool cylinder head temps



having just put about 3 hrs. on my newly completed RV-6, I have a queston

about cylinder head temps. The temps are reading between 150-200. This just

doesn't seems possible. My question is what to check first. Should I

calibrate my temp guage? block off the air inlet? I'm not sure what to do

first as all my other temps are normal. Oil is 170-180, EGT's are 1200-1500.

RPM's are all normal, 2300 static, 2750 full throttle, both mags seems to

work fine, and the engine sounds good. I just don't know if I am doing any

harm by continuing to run at these indicated temps. The outside temperature

here in Sheridan Wy. has been in the 40's lately and shouldn't be a factor.

sbuc(at)hiwaay.net
Guest

Posted: Fri Jan 06, 2006 10:40 am Post subject: way to cool cylinder head temps



DAVE MADER wrote:

duanehopper(at)sprintmail
Guest

Posted: Fri Jan 06, 2006 10:58 am Post subject: way to cool cylinder head temps



Dave,

Perhaps you're seeing temperatures in C versus F on CHT; and F for both

oil and EGT?

If you're guage is reporting on the Celsius scale for CHT in the 150-200

range, you're closing matching "normal" range in Fahrenheit, at least

from my own experience with my new RV-6A. That'd be approximately

300-390 F, which is where my CHT's are operating at the rpm's you noted

after about 15 hours of operation. And my oil and EGT numbers are right

where yours are in Fahrenheit degrees (although I'm seeing a max of

about 1350 on EGT, not 1500).

Hope this was helpful,

Duane Hopper

DAVE MADER wrote:

having just put about 3 hrs. on my newly completed RV-6, I have a queston

about cylinder head temps. The temps are reading between 150-200. This just

doesn't seems possible. My question is what to check first. Should I

calibrate my temp guage? block off the air inlet? I'm not sure what to do

first as all my other temps are normal. Oil is 170-180, EGT's are 1200-1500.

RPM's are all normal, 2300 static, 2750 full throttle, both mags seems to

work fine, and the engine sounds good. I just don't know if I am doing any

harm by continuing to run at these indicated temps. The outside temperature

here in Sheridan Wy. has been in the 40's lately and shouldn't be a factor.

pat_hatch(at)msn.com
Guest

Posted: Fri Jan 06, 2006 11:15 am Post subject: way to cool cylinder head temps



What kind of probes do you have: the bayonets that go into the bottom of the

cylinders or the ring thermocouples around the spark plug? Do you have a

probe for each cylinder? Have you checked for calibration? I would get a

coffee can or equivalent, put some water in it, mount it on the engine

somewhere within reach of the probe and put a torch to it until it boils.

Check for 212 degrees F at the instrument (roughly). You obviously have an

indication problem, so you need to troubleshoot to find out if it's a

thermocouple, wiring, or indicator problem. Sounds like you have only one

probe, so this might make it more difficult to troubleshoot. Hope this

helps.

Pat Hatch

Do not archive

RV-6

RV-7

Vanremog(at)aol.com
Guest

Posted: Fri Jan 06, 2006 4:10 pm Post subject: way to cool cylinder head temps

jpoint(at)mindspring.com
Guest

Posted: Fri Jan 06, 2006 4:31 pm Post subject: way to cool cylinder head temps



Uh, yeah, but isn't "spell check" two words? That's what my spelchekur

says.

Jeff Point

RV-6

Milwaukee

do not archive

Vanremog(at)aol.com wrote:

 	  Quote: 	
		  I see your problem. You should really have installed a gauge. Use

spellcheck people.

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jsflyrv

Joined: 03 Jan 2006
Posts: 22

Posted: Fri Jan 06, 2006 4:38 pm Post subject: way to cool cylinder head temps



Vanremog(at)aol.com wrote:

davemader(at)bresnan.net
Guest

Posted: Fri Jan 06, 2006 5:09 pm Post subject: way to cool cylinder head temps



Guys

Found my problem today and am almost embarassed to say what it is. (I don't

think spelling it correctly would have solved it) What I did was put the

probes in the wrong spot on each cylinder. On the 0-360 there are 2,

sometimes 3 different threaded taps for various things. Probes, primer, etc.

What I did was install the CHT sensors directly above where the intake tube

connect to the bottom of the cylinder. The probe was seeing much cooler temps

from the fuel, air mixture coming in. The CHT probe goes in the threaded hole

in the bottom center of each cylinder. DUH! Temps all normal now and

everything in the green. Maybe this post will help the 1 in a thousand that

didn't know this.

Dave Mader

RV-6.....3.8 hrs today

On Fri, 6 Jan 2006 19:10:14 EST

Vanremog(at)aol.com wrote:

pat_hatch(at)msn.com
Guest

Posted: Fri Jan 06, 2006 6:02 pm Post subject: way to cool cylinder head temps



Dave,

Glad to hear you found your problem...Another cue is that the probes are NOT

pipe threads, so if you tried one of the 1/8" pipe fitting taps, it should

not thread properly, indicating that you are in the wrong hole. Don't ask

how I know...You mentioned the proper hole is in the bottom center of the

cylinder--also, the proper hole is not capped or plugged.

Pat Hatch

truflite(at)yahoo.com
Guest

Posted: Fri Jan 06, 2006 8:33 pm Post subject: way to cool cylinder head temps



An older A&P once told me the best way to calibrate

CHT probes was to immerse them in almost boiling

water. When it boils, the guage should read 212

degrees. If not, adjust appropriately.

Dave

--- DAVE MADER <davemader(at)bresnan.net> wrote:

<davemader(at)bresnan.net>

klwerner(at)comcast.net
Guest

Posted: Fri Jan 06, 2006 10:16 pm Post subject: way to cool cylinder head temps



Dave,

Perhaps (at) Sealevel. Boilingpoint varies with altitude/-airpressure. Lower air pressurelower boilingpoint of water.

Albuquerque is at ~5000+ft. and Spaghetti cooking takes longer here because of the lower boiling temperatures.

Do not archive

Vanremog(at)aol.com
Guest

Posted: Fri Jan 06, 2006 11:46 pm Post subject: way to cool cylinder head temps

alexpeterson(at)earthlink
Guest

Posted: Sat Jan 07, 2006 6:59 am Post subject: way to cool cylinder head temps



 	  Quote: 	
		  

Good job picking up on the obvious. Don't you wish I was

giving out prizes.

)

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