YS 140 problem

[John Ferrell]

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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