YS 140 problem

[John Ferrell]

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?

      
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20050725/cae326b1/attachment.html