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M14P Jet Mod

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threein60(at)yahoo.com
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Posted: Mon Oct 19, 2009 8:19 am Post subject: M14P Jet Mod

Just seeing what the consensus is..  Has anyone performed the jet mod on the M14 as described in this attachment?  If so what are your results?  Any concerns?

 Thanks in advance.

 N8181C

 Larry Pine

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M14_Carb_Mod.pdf

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threein60(at)yahoo.com
Guest

Posted: Mon Oct 19, 2009 8:42 am Post subject: M14P Jet Mod

 	  Quote: 	
		        

Just seeing what the consensus is..  Has anyone performed the jet mod on the M14 as described?  This is the mod that is to help eliminate throttle advance stumple.  If so what are your results?  Any concerns?

 Thanks in advance.

 N8181C

 Larry Pine





	


           [quote][b]

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dsavarese0812(at)bellsout
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Posted: Mon Oct 19, 2009 9:43 am Post subject: M14P Jet Mod

Although I have used this "fix" on several M14 carburetors,  Termikas has found an even better solution.  The problem has always been  the accelerator pump jet diameter being too large, including even the smallest  jet which is .9 mm.  What Termikas has found out (and I have done this on  my engine) is to remove the jet in the accelerator pump at the TOP of the  chamber just above the one shown in .pdf file pictures.  See  attached.  The jet at the top is always .6 mm and it seems that placing the  larger jet at the top of the accelerator pump does not have any negative  operational results.  It does remove the hesitation and the accelerator  pump remains in full operation.

 Dennis

  

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Carburetor_jet_swap.bmp

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scott-p(at)texas.net
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Posted: Mon Oct 19, 2009 12:36 pm Post subject: M14P Jet Mod

Yes.



Did this mod on my former SU-29 and my current Yak 55M. Does a great 

deal to reduce "stumbling" if power needs to be abruptly increased, and 

seems to reduce loading up while taxiing also, although that is much 

less pronounced.



I've been very happy with this mod.



Scott



Larry Pine wrote:

 	  Quote: 	
		  

 Just seeing what the consensus is..  Has anyone performed the jet mod 

 on the M14 as described in this attachment?  If so what are your 

 results?  Any concerns?

 Thanks in advance.

 N8181C

 /Larry Pine/

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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cjpilot710(at)aol.com
Guest

Posted: Mon Oct 19, 2009 7:08 pm Post subject: M14P Jet Mod

When I got my engine new direct from Aerostar, it stumbled badly when  advancing the throttle quickly.  Scare the popo out me sometimes.

 The engine came with a whole selection of jets as part of the parts kit you  get with a new engine.  I put in the smallest one I could fine.  I  really don't know the size.  The engine stopped its stumbling and has been  fine now for 1,500 plus hours.

  

 I've heard of both the plugging and using the .6 mm jet.  From  all accounts, both seem to work OK.

  

 Jim "Pappy" Goolsby.

  

  

  In a message dated 10/19/2009 4:37:46 P.M. Eastern Daylight Time,  scott-p(at)texas.net writes:

  	  Quote: 	
		  -->    Yak-List message posted by: Scott Poehlmann    <scott-p(at)texas.net>



Yes.



Did this mod on my former SU-29    and my current Yak 55M. Does a great 

deal to reduce "stumbling" if power    needs to be abruptly increased, and 

seems to reduce loading up while    taxiing also, although that is much 

less pronounced.



I've been very    happy with this mod.



Scott



Larry Pine wrote:

 	  Quote: 	
		  

    Just seeing what the consensus is..  Has anyone performed the jet mod    

 on the M14 as described in this attachment?  If so what are your    

 results?  Any concerns?

 Thanks in advance.

    N8181C

 /Larry  ================================================e  ties  Day  ================================================               - MATRONICS WEB FORUMS  ================================================             - List Contribution Web Site  sp;                             ===================================================


	


	


  [quote][b]

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dsavarese0812(at)bellsout
Guest

Posted: Tue Oct 20, 2009 3:06 am Post subject: M14P Jet Mod

The difference between plugging and swapping the two  jets is, by swapping the two jets the accelerator pump is not degraded or  disabled.  Personally, I think it is a better solution even though for 7  years I had been running mine with the lower jet (1.0 mm in mine)  plugged.

 Dennis

 [quote]   ---

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richard.goode(at)russiana
Guest

Posted: Tue Oct 20, 2009 8:53 am Post subject: M14P Jet Mod

I find it odd that owners/pilots should do  this sort of crude modification when they clearly have no idea what is the  purpose of that jet.  

  

 This jet is part of the acceleration pump,  which, when the throttle is opened allows a certain amount of extra fuel to be  pumped into the carburettor.   

  

 The reason that many M14P engines hesitate  when the throttle is opened is simply that this jet is too rich and is putting  in too much fuel. 

  

 This jet is designed to be adjustable, and  five different jets are made varying from 0.9 to 1.4mm.  Even the 0.9 can  be too large with some engines, in which case one can fill the jet with solder,  and drill out a smaller hole. 

  

 Note that, with the jet blocked, you are  also likely to get a stumble, but in this case through too weak a  mixture.   

  

 The best way of assessing which jet that you  need, is to open the throttle when the engine is running on the ground, to see  if it does stumble, and if there is obvious black smoke denoting  over-richness.  If so, then go to a small jet.   

  

 Also, few owners change compensating  jets.  Engines when new are usually set up rich, and again there is a range  (I think 1.2 - 2.1mm), and the right jet is very important to control the  cylinder temperatures and also fuel consumption.  

  

 Richard Goode Aerobatics 

Rhodds Farm  

Lyonshall

Herefordshire

HR5 3LW 

United Kingdom

  

 Tel: +44 (0) 1544 340 120

Fax: +44 (0)  1544 340 129 

www.russianaeros.com



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