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Cooling before shut down / carburettor adjustment

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richard.goode(at)russiana
Guest

Posted: Fri Jun 01, 2007 5:41 am Post subject: Cooling before shut down / carburettor adjustment

The principal carburettor adjustment to control temperature is that of the  compensating jets.   Since they are compensating, a smaller jet gives  a slightly richer mixture.   

  

 These are available in 0.1 mm increments from, I think, 1.1 mm up to 2.2  mm.  Obviously most aircraft work somewhere in the middle. 

  

 Rob Kent e-mail rkent(at)wlacrussianeng.co.uk (rkent(at)wlacrussianeng.co.uk) has sets  of jets.  

  

 Essentially you should set the engine up as lean as possible, but within  the constraint that it does not overheat during any normal operation.

  

 Separately, I notice that very few M14Ps are properly set up, mainly  because so few people in the West know how to adjust the carburettors.   

  

 It is well written up in the M14P manual, but is difficult to do in  practice, since the adjustments are very small, and effect each other. 

  

 

Richard Goode Aerobatics

Rhodds  Farm

Lyonshall

Herefordshire

HR5 3LW

United Kingdom

  

 Tel:    +44 (0) 1544 340120

Mob:  +44 (0) 7768  610389

Fax:   +44 (0) 1544 340129

www.russianaeros.com

   [quote][b]

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dsavarese(at)elmore.rr.co
Guest

Posted: Fri Jun 01, 2007 5:59 am Post subject: Cooling before shut down / carburettor adjustment

Richard, The M14P carburetor manual does not use the term  "compensating jets".  There are 3 jets listed which have multiple jet  sizes.  They are: the Suction jet; the Acceleration pump jet; and the Fuel  Jet .  Which of these three jets are you calling the compensating  jet?  Only the Suction jet sizes comes close to the sizes you mention; ie:  1.3 mm to 2.0 mm.  The Fuel jet is either 3.2 to 3.3 mm and the  acceleration pump jet is .9 to 1.4 mm.  Why do you call it the compensating  jet?  What is it compensating for?

 Thanks for your help on this.  I'm sure that many folks  on the list are wondering about this as well.

 Dennis

  

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richard.goode(at)russiana
Guest

Posted: Fri Jun 01, 2007 6:25 am Post subject: Cooling before shut down / carburettor adjustment

From Dennis's Mail,yes the Suction  jet.

 Russians have allways called it a  "compensating" jet in that it is an air jet,and the smaller the jet the richer  the mixture.

 Richard

  

 Richard Goode Aerobatics

Rhodds Farm

Lyonshall

Hereford

HR5  3LW

United Kingdom

  

 Tel:   +44 (0) 1544 340120

Fax:  +44 (0) 1544  340129

www.russianaeros.com



 [quote]   ---

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rkent(at)wlacrussianeng.c
Guest

Posted: Fri Jun 01, 2007 7:25 am Post subject: Cooling before shut down / carburettor adjustment

The ONLY difference between the suction jet and the acceleration jet is the size of the hole. A 1.3mm suction jet is IDENTICAL to a 1.3mm acceleration jet and despite the fact that the manual states the suction jet being 1.3mm to 2mm, I have never seen a 2mm jet. We have some original carburetor kits which include the jets but only up to 1.9mm.   

   

The jets compensate the mixture ratio. i.e if with standard set up there is too much air in the mixture, replacing the suction jet for a smaller one will compensate for the amount of air in the mixture.  

   

Only the suction jet and the acceleration jet should be adjusted. The 3.2 – 3.3mm fuel jet is set during manufacture/overhaul of the carburetor and should not be tampered with. I have the relevant part of the M14 manual with instructions etc for adjusting the carburetor. This is in pdf format and I will make this available to download asap.   

   

As Richard points out, jets are available from stock in sizes from 0.9mm up to an including 1.9mm.  

     

Rob Kent  

Stores Manager  

WLAC - Russian Engineering  

www.wlacrussianeng.co.uk  

   

Tel: +44 1628 829 165  

Fax: +44 1628 825 975  

Mob: +44 7842 964 358  

   

  

   

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