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Jetting and Pitching a 582

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dosmythe(at)cox.net
Guest

Posted: Fri Oct 27, 2006 3:41 am Post subject: Jetting and Pitching a 582

I'm probably going to open up another bag of  worms here.  Back several years ago when I was trying to get my 582 in the  air I was having a problem understanding the concept of jetting and pitching a  582.  Our good friend Bruce Harrington finally challenged me to write a  simple procedure for proper jetting/pitching.  He finally gave me a passing  grade on the following procedure.  Back then, no body ever came back and  said this procedure was bogus.  If I remember correctly, it didn't even  cause a stir.  Just curious with today's group if it will be  agreed upon.    Went something like this, take your best shots:   

  

 1.  Look ahead at the anticipated OAT's for  your local flight area.  (Example, it's November with average  daily temps of 60-70 degrees.  Temps in January expected to be 30-40  degrees)

  

 2.  Look on the recommended Rotax jetting  chart and select the proper main jet for your altitude and the projected  30-40 degrees OAT's.  Install jets.

  

 3.  Pitch the prop to a recommended starting  pitch.

  

 4.  Go fly the airplane.  Let it warm up  good and on a long downwind leg push the throttle to full while holding  firm forward stick to maintain as near perfect level flight as  possible.

  

 5.  Hold full throttle and level flight long  enough to let EGT's and RPM's stable out (about 10 seconds or  so).  Record readings.  EGT's should be around 1100-1150 (less than  1200).  RPM's should be near 6800.

  

 6.  If RPM are say, 6600, go back to the  hanger and take out 1/2 degree pitch.  Repeat steps 4 and 5 until RPM's are  near 6800.  You are done.

  

 Caution:  Do not let RPM's exceed 6800.   If so, reduce throttle and repeat step 6 by adding pitch in 1/2 to 1 degree  increments.

 Caution:  Avoid pitching the prop to simply  improve performance

    [quote][b]

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dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Fri Oct 27, 2006 4:17 am Post subject: Jetting and Pitching a 582

Don,  Very good info.

I will add though that EGT of 1200 is not bad "IF" the plugs look ok.

EGT is just a instrument to me to tell me what is going on inside the

combustion chamber. I am not saying to run at 1200 + for extended periods

of time but I will say  that your spark plugs will tell the story.



   Mine are over 60 hours on them and due for a change( last change early

July) .   I have been running 1150 to 1175 most of yesterday and like i

said I think that I can add a bit more pitch due to the fact that I am

getting over 6800 rpm  WOT now.   That being said I am looking forward

to colder and more denser air yet and a dump of snow in the next 2 to 6

weeks so more pitch might not be necessary quite yet but I think it

will happen.



Will report back findings  soon.  And GSC  props is working very well --

hard to say if it better or worse than the WARP but quite adequate so far.

  A few more tweaks and the story will be told.



Dave



On Fri, October 27, 2006 7:41 am, Don Smythe wrote:

 	  Quote: 	
		   I'm probably going to open up another bag of worms here.  Back several

 years ago when I was trying to get my 582 in the air I was having a

 problem understanding the concept of jetting and pitching a 582.  Our good

 friend Bruce Harrington finally challenged me to write a simple procedure

 for proper jetting/pitching.  He finally gave me a passing grade on the

 following procedure.  Back then, no body ever came back and said this

 procedure was bogus.  If I remember correctly, it didn't even cause a

 stir.  Just curious with today's group if it will be agreed upon.    Went

 something like this, take your best shots:



 1.  Look ahead at the anticipated OAT's for your local flight area.

 (Example, it's November with average daily temps of 60-70 degrees.  Temps

 in January expected to be 30-40 degrees)



 2.  Look on the recommended Rotax jetting chart and select the proper main

 jet for your altitude and the projected 30-40 degrees OAT's.  Install

 jets.



 3.  Pitch the prop to a recommended starting pitch.



 4.  Go fly the airplane.  Let it warm up good and on a long downwind leg

 push the throttle to full while holding firm forward stick to maintain as

 near perfect level flight as possible.



 5.  Hold full throttle and level flight long enough to let EGT's and RPM's

 stable out (about 10 seconds or so).  Record readings.  EGT's should be

 around 1100-1150 (less than 1200).  RPM's should be near 6800.



 6.  If RPM are say, 6600, go back to the hanger and take out 1/2 degree

 pitch.  Repeat steps 4 and 5 until RPM's are near 6800.  You are done.



 Caution:  Do not let RPM's exceed 6800.  If so, reduce throttle and repeat

 step 6 by adding pitch in 1/2 to 1 degree increments.

 Caution:  Avoid pitching the prop to simply improve performance

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dosmythe(at)cox.net
Guest

Posted: Fri Oct 27, 2006 4:30 am Post subject: Jetting and Pitching a 582

I agree 100%.  I use 1200 degrees as the absolute number simply because it 

is a Rotax max spec.



Don Smythe

Do Not Archive

 	  Quote: 	
		   I will add though that EGT of 1200 is not bad "IF" the plugs look ok.

 EGT is just a instrument to me to tell me what is going on inside the

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Malcolmbru(at)aol.com
Guest

Posted: Fri Oct 27, 2006 4:44 pm Post subject: Jetting and Pitching a 582

In michigan some people belive that adding a little pitch will lower the  egt in colder OAT. some kit foxes wil go VNE at 6800 rpm in livel flight.   if you set static rpm at 62500 like most recomend it usually won't do 68000 full  out.   malcolm 

  [quote][b]

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dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Sat Oct 28, 2006 6:10 am Post subject: Jetting and Pitching a 582

Malcolm,   I have to disagree  as mine is 6200 and goes to  7000  WOT with the new  prop blades from GSC,  but  I still got some tweaking .  winds forcast  25 to 40 knots here today  so I gonna do indoor sports. Would be agood day to do some backward flying  videos    

  

 Agree though on adding pitch to reduce EGT temp but that being said  I  set pitch for   RPM then adjust  needle in carb  to   change EGTs  if needed  depending on time of season. 

  

  

  

 Dave

  

  

 [quote]   ---

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Float Flyr

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

Posted: Sat Oct 28, 2006 5:22 pm Post subject: Jetting and Pitching a 582

It's a bit of a balancing act.  Cold  days can make the engine run lean.   

  

  

 

Noel [quote]   

   --

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