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582 Idle Speed - WAS PRop Drag

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msm_9949(at)yahoo.com
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Posted: Tue Oct 17, 2006 8:01 am Post subject: 582 Idle Speed - WAS PRop Drag

Noel, 

   

  I haven't been able to get my 582's idle speed below about 2400 rpms. I've adjusted the carb slides and throttle cables, rejetted the idle jets (twice), everything that's been suggested. It will go no lower. The only thing I've found that will slow it down further is to apply the choke. I don't do it for very long, not wanting to soot up my plugs, but by making the prop free-wheel, it works very well to stop the floating.



Noel Loveys <noelloveys(at)yahoo.ca> wrote:

   	  Quote: 	
		      I was advised to set my idle to around 1500 rpm.  and to use that speed only to assist in getting the plane back on the ground.  Once on the ground speed the idle up to at least 2000 rpm or higher if  required to get the engine to run smoothly.  

	




Marco Menezes

Model 2 582 N99KX

  [quote][b]

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Wed Oct 18, 2006 5:57 am Post subject: 582 Idle Speed - WAS PRop Drag

When I pull my throttle  all the way out the rpm will go all the way down to 1500.  Mind you if that  happens while on the ground there will be enough vibration to shake the fillings  out of your teeth.  That's not good for the engine or the  aircraft.

  

 What kind of tachometer do you  have???  The electronic "Kitfox tach or one of the newer digital tachs that  have no moving parts e.g. Tiny Tach?  last year I had a lot of problems  with my engine.  By the end of the season (floats) I came to the conclusion  that there was a problem with my tach.  The cheapest most accurate way to  tell if I was right was to install a tiny tach.  The short story is I  was right.

  

 My Kitfox tach was reading 250  rpm high per 1000rpm indicated. e.g. 2000rpm  indicated was actually  1500rpm,  6800 rpm (take off max) was actually 5100rpm..  Wonder why I  had problems getting into the air and climbing with floats or why I had to shim  the hinges in my elevator. ( from idle vibration)

  

  

 

Noel [quote]   

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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

msm_9949(at)yahoo.com
Guest

Posted: Thu Oct 19, 2006 8:14 am Post subject: 582 Idle Speed - WAS PRop Drag

Noel,

   

  I have a cheap analog tach for CDI ignitions purchased from ACS. I put it in after frying the analog Kitfox tach during initial run-ups. (I neglected to install the supplemental resistor in the tach's circuit, per the Rotax SB). I'm sure the current tach reads 200-300 rpm too high at idle. I've checked this with hand-held digital tach. The clutch manufacturer represents that clutch disengages at 2400 rpm. At idle (throttle full back) my tach reads about 2700 rpm, so in reality, it's probably turning just at the threshhold where clutch engages.

   

  I should probably invest in a more accurate tach, but that wouldn't resolve the puzzle of idle speed that won't go below 2400.



Noel Loveys <noelloveys(at)yahoo.ca> wrote:

  [quote]     When I pull my throttle all the way out the rpm will go all the way down to 1500.  Mind you if that happens while on the ground there will be enough vibration to shake the fillings out of your teeth.  That's not good for the engine or the aircraft.

   

  What kind of tachometer do you have???  The electronic "Kitfox tach or one of the newer digital tachs that have no moving parts e.g. Tiny Tach?  last year I had a lot of problems with my engine.  By the end of the season (floats) I came to the conclusion that there was a problem with my tach.  The cheapest most accurate way to tell if I was right was to install a tiny tach.  The short story is I was right.

   

  My Kitfox tach was reading 250 rpm high per 1000rpm indicated. e.g. 2000rpm  indicated was actually 1500rpm,  6800 rpm (take off max) was actually 5100rpm..  Wonder why I had problems getting into the air and climbing with floats or why I had to shim the hinges in my elevator. ( from idle vibration)

   

   

  Noel

  [quote]  

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dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Thu Oct 19, 2006 8:36 am Post subject: 582 Idle Speed - WAS PRop Drag

Marco , I would get a tiny tach.   They  are accurate and simple to install   ( about 1 minute) 

  

 I know nothing about cluthes nor  do I have  any use for one. But With the prop not engaged I think your 582 should easily  idle below 2000 and smooth as well. 

  

 I would call a Rotax guy like Bob Robertson to get  his opinion and order a tiny tach from him. They are cheap and Bob ships  overnight. 

  

  

 Dave

  

  

  

 [quote]   ---

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Thu Oct 19, 2006 11:49 am Post subject: 582 Idle Speed - WAS PRop Drag

Marco:

  

 I would suggest the first thing  to do is to get a more accurate tach.  Even if it is only a borrowed  optical tach that reads the prop speed.   That way you at least will  know what ball park you are in.

  

 I am thinking the clutches  that engage your clutch are supposed to be set up for 2400rpm but that may be  off too.  If the springs that disengage the clutch are stretched at all  than the clutch could be engaging at too low an engine  speed.   One thing I can tell you for sure that below 2000+ rpm the  engine will run rough as it can.  Shortly above 2000rpm the engine will  smooth out considerably.

  

  

 

Noel [quote]   

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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Thu Oct 19, 2006 11:54 am Post subject: 582 Idle Speed - WAS PRop Drag

I agree whole heartedly with  Dave.... I got my tiny tach from Bob.  Probably the best money I've  spent.

  

  

 

Noel [quote]   

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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

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