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503 Running Cold

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Tom463(at)aol.com
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Posted: Fri May 26, 2006 5:44 pm Post subject: 503 Running Cold

I have a Rotax 503 DCDI, with oil injection, on a Firestar  II.  The engine 

is about 50 hours out from a total rebuild and has been  performing flawlessly, 

except during the past 5 or 6 hours, it has started  running cold.  The EGT's 

stay around 9 and 10 on the gauges at 5000 RPM,  which is where I regularly 

cruise. My one CHT gauge used to read around 2.5, but  lately it is getting 

down to 1.5 or less. I suspected a problem with the  gauge; however, when I 

throttle back to idle for landing, it will climb back up  to between 2 and 2.5, by 

the time I'm at a full stop on the ground. The  readings on the EGT's increase 

and decrease in conjunction with the RPM's of the  engine. The engine doesn't 

seem to perform or sound any differently. The Tiny  Tach says my max RPM on 

take-off is 6200 on a 3 blade Warp Drive.  I'm no  mechanic. Any suggestions?

 

_Tom463(at)aol.com_ (mailto:Tom463(at)aol.com) 

 

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HShack(at)AOL.COM
Guest

Posted: Fri May 26, 2006 7:32 pm Post subject: 503 Running Cold

In a message dated 5/26/2006 9:45:06 PM Eastern Standard Time, Tom463(at)aol.com 

writes:

I suspected a problem with the  gauge; however, when I 

throttle back to idle for landing, it will climb back up  to between 2 and 

2.5, by 

the time I'm at a full stop on the ground. The  readings on the EGT's 

increase 

and decrease in conjunction with the RPM's of the  engine. The engine doesn't 

seem to perform or sound any differently. The Tiny  Tach says my max RPM on 

take-off is 6200 on a 3 blade Warp Drive.  I'm no  mechanic. Any suggestions?

My guess is that either your gage or sensor or wiring is wrong.  Temps should 

be around 300 degrees or so; what's with the 1.5, 2.0, etc.?  Can't think of 

anything that would actually make CHT's go down.



I also think your max RPM on takeoff should be about 200 rpm higher; take 

about 1 degree pitch out of your prop.



Howard Shackleford

FS II

SC

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