YS 140 problem

[John Ferrell]

I am glad it came out so simple! I will probably have to try a couple of 17 inch props as a result of the discussion. I think your engine is more potent than any I have. 


John Ferrell    
http://DixieNC.US

  ----- Original Message ----- 
  From: Daniel J. Hamlett 
  To: discussion at nsrca.org 
  Sent: Monday, July 25, 2005 9:56 AM
  Subject: Re: YS 140 problem


  I really hate to do this to myself but I think that I owe it to all the people that offered an opinion to me about my engine.  The engine has been idling at 2150-2200 all along.  The tach that I was using was taking a really long time to settle down.  It had been a while since I had used it.  I had a friend help me at the field before I went drilling hole and what not.  When he put the tach on the engine he waited a little bit longer than I was apparently and the engine or actually the display on the tach dropped right into line.  Come to find out the battery in the tach was very very low.  I replaced it and now the tach reads pretty quick.  So I guess all that to say I am a big DUMMY.

  I thought that I would share this as a little humor.  Again thanks to all that gave there input.

  See you all at the next contest.

  Dan

  John Ferrell wrote: 
    I still say if you back down to a 15-12 or a 16-10 you will find the idle will be fine. And you will have the strongest YS140 around!

    The increased air bleed has worked for lots of engines as well. I have never had to resort to it.

    John Ferrell    
    http://DixieNC.US

      ----- Original Message ----- 
      From: Daniel J. Hamlett 
      To: discussion at nsrca.org 
      Sent: Saturday, July 16, 2005 10:22 AM
      Subject: Re: YS 140 problem


      I am getting 8400-8450.  That is why I thought that I was ok on the size.

      John Ferrell wrote: 
        My two cents worth....
        That is the first time I have heard of that much prop on a Sport 140. It is way too much prop for break in of a new engine. I don't know if there is any damage due to that load. I use about 40 ounces of fuel on tat engine to break it in with a 15-10 prop at about 8200 rpm. 

        I feel the bigger prop will generate more heat and will need more latitude for mixture control than the YS system provides. When more prop than a 15-12 or 16-10 is used on a YS 140 engine (not DZ!) more nitro is needed. There is more oxygen available in the higher nitro fuel so you have a wider needle available.

        BTW, what is the max rpm you get out of a 17-10 with 20% fuel?

        John Ferrell    
        http://DixieNC.US

          ----- Original Message ----- 
          From: Daniel J. Hamlett 
          To: discussion at nsrca.org 
          Sent: Thursday, July 14, 2005 10:06 PM
          Subject: Re: YS 140 problem


          The engine is a sport.  It has less than 40oz through it.  I am running  the 1.40, NHP 5/8th header and ES carbon 5/8th inlet pipe.  Sorry I forgot to add this on the original post.

          Bob Kane wrote: 
Which 140?  FZ, L, DZ, Sport?  I assume it must be a
DZ swinging a 17X10?

      
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