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Proper Jets

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DAquaNut(at)aol.com
Guest

Posted: Thu Jan 26, 2006 10:00 am Post subject: Proper Jets

Group,

 

  Thanks for the input on EGT. Seems I have the correct main of 165  ,as I am 

at around 45' above sea level and will not be in temps over 95*  I  guess I 

should have given more info on my egt question.

                                                             Firefly 447

                                      Full throttle take off:    EGT   1000 * 

  CHT   350*

                   WOT  level flight       6,450  rpms         75mph          

Temps about same as  above

                  Flying  slightly above stall speed      4500-5000   rpms   

EGT 1200*   CHT 350* 

 

       If I fly above 5200     or below 4000 or so, all temps are fine. Do 

these look like normal temps and I  will just have to avoid slow flying? Or is 

there some other trick. I just dont  want to ruin a new engine.

 

             Ed  Diebel ( Firefly #62)

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Thu Jan 26, 2006 10:13 am Post subject: Proper Jets

Subject: Re: Proper Jets

 |

|             Ed  Diebel ( Firefly #62)



Ed D/Gang:



I'd be happy with those temps if it was my airplane and engine.  Can't 

get any better than that.



john h

MKIII

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

Richard Pike

Joined: 09 Jan 2006
Posts: 1670
Location: Blountville, Tennessee

Posted: Thu Jan 26, 2006 11:01 am Post subject: Proper Jets

That doesn't sound dangerous to me, 1200 degrees is marginal by Rotax's 

current specs, although normal by their specs from former years, but at 

5000 rpm's or below an EGT of 1200 will be unlikely to hurt anything. 

And that temp will drop closer to the "normal" range when summer gets here.

 Do you have the jet needle and needle jet that Rotax calls for? A 

fatter needle than called for will give you less fuel in midrange. And 

so will a smaller needle jet.



Richard Pike

MKIII N420P (420ldPoops)

DAquaNut(at)aol.com wrote:



 	  Quote: 	
		  



Group,

 

  Thanks for the input on EGT. Seems I have the correct main of 165  ,as I am 

at around 45' above sea level and will not be in temps over 95*  I  guess I 

should have given more info on my egt question.

                                                             Firefly 447

                                      Full throttle take off:    EGT   1000 * 

  CHT   350*

                   WOT  level flight       6,450  rpms         75mph          

Temps about same as  above

                  Flying  slightly above stall speed      4500-5000   rpms   

EGT 1200*   CHT 350* 

 

       If I fly above 5200     or below 4000 or so, all temps are fine. Do 

these look like normal temps and I  will just have to avoid slow flying? Or is 

there some other trick. I just dont  want to ruin a new engine.

 

             Ed  Diebel ( Firefly #62)

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_________________
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.

DAquaNut(at)aol.com
Guest

Posted: Thu Jan 26, 2006 7:15 pm Post subject: Proper Jets

In a message dated 1/26/2006 1:02:17 P.M. Central Standard Time,  

richard(at)bcchapel.org writes:



Do you  have the jet needle and needle jet that Rotax calls for? A 

fatter needle  than called for will give you less fuel in midrange. And 

so will a smaller  needle jet.



Richard Pike

MKIII N420P  (420ldPoops)



Bro. Pike,

 

 

     I wouldn't know one needle from the other.  How do you tell what size 

needle you have. I dont have another one to compare it  to. It is what came in 

it new from the New Kolb Factory. Seems I dont have  to worry about the temps 

being 1200* as long as I'm under 5,000 rpms. Whenever  it goes to 1200* I goose 

it and the egt drops right away.  Sounds like a  rotax right?

 

                     Ed Diebel   (447 Firefly)

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