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Rotax 447

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dave(at)cfisher.com
Guest

Posted: Wed Sep 06, 2006 6:18 am Post subject: Rotax 447

I have a 503 single carb and use a rectangular pump with no issues.



I would try that.



What was the issue ?  I must have missed that last week ?

Dave

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jfesch(at)earthlink.net
Guest

Posted: Fri Sep 08, 2006 6:56 am Post subject: Rotax 447

 	  Quote: 	
		  Have you replaced your impulse line to the fuel pump ?


	


Dave

I replaced the pulse line with a new and one bought from CPS about 11 hours ago. It appears to be holding up.

I pulled the exhaust manifold off last night didn't find any carbon on the piston rings only the normal buildup on top of the pistons and exhaust. Nothing excessive.  The piston skirts are nice and shiney.

 	  Quote: 	
		  From what I can see there is no buildup of carbon on the other ports. I will see if I can borrow a bore scope to get a better look at the heads.

My new pump, air and fuel filter should be here in a day or two.  I have a feeling it might be the fuel delivery system that might have been the cause. The only thing is why it affected only one cylinder? Maybe I caught it pretty quickly and EGT never caught up on the #1 cylinder. Who knows, things happened pretty fast and I wasn't interested in watching the instruments at the time, just to get myself back on the ground before things really went south.
	


John



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dave(at)cfisher.com
Guest

Posted: Fri Sep 08, 2006 8:13 am Post subject: Rotax 447

Good stuff.



I had plane that  I was test flying last year for a guy with a 503 single 

carb.  I forget the egts at the time but it lost power on climbout and would 

only get about 5000  rpm max.

I not sure what happened but I landed and tried several crop hops after that 

and it would get full power and just get airbourne and then lose power . 

This  happened to me a few more times.  I was convinced that is was a fuel 

starvation problem.

Don't ask me why but I turned off the fuel at the tank valve and it was a 

ball type i think  , you know about 1/4 turn to make it open or closed.  I 

ran it till it stopped taxing.

Then I opened fuel again and primed it - hit the key  -- and it was running

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NYTerminat(at)aol.com
Guest

Posted: Fri Sep 08, 2006 6:06 pm Post subject: Rotax 447

John,

 By any chance do you have a primer bulb in the fuel line? A friend of mine  has an C.G Hawk Ultralight and he was having surges in the engine. He replaced  the fuel line, cleaned the fuel tank, replaced the fuel pump and would sometimes  still have the surges. He was told to replace his bulb primer and that took care  of the problem. The check valve in the primer bulb was sticking. Just a thought.  Good luck.

  

 Bob Spudis 

  

  

 In a message dated 9/8/2006 10:58:28 A.M. Eastern Daylight Time,  jfesch(at)earthlink.net writes:

  	  Quote: 	
		  >Have    you replaced your impulse line to the fuel pump ?



Dave

I replaced    the pulse line with a new and one bought from CPS about 11 hours ago. It    appears to be holding up.

I pulled the exhaust manifold off last night    didn't find any carbon on the piston rings only the normal buildup on top of    the pistons and exhaust. Nothing excessive.  The piston skirts are nice    and shiney.

 	  Quote: 	
		  From what I can see there is no buildup of carbon on the    other ports. I will see if I can borrow a bore scope to get a better look at    the heads.

My new pump, air and fuel filter should be here in a day or    two.  I have a feeling it might be the fuel delivery system that might    have been the cause. The only thing is why it affected only one cylinder?    Maybe I caught it pretty quickly and EGT never caught up on the #1 cylinder.    Who knows, things happened pretty fast and I wasn't interested in watching the    instruments at the time, just to get myself back on the ground before things    really went south.
	


John



	


 

  

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Malcolmbru(at)aol.com
Guest

Posted: Fri Sep 08, 2006 8:19 pm Post subject: Rotax 447

I havent folowed the hole topic and dont like to go off on a tangent but  have you tried cheking the gage? they go bad prety fast  just change the  conections and see if it makes a diferences  the gage can be sent back for  calabration real cheep.or swap the sending units. if all  lookes good and  you see no sign of a temp spike on the piston or plug.   mal michigan  kit fox 582   

  [quote][b]

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