YS 140 problem

[Daniel J. Hamlett]

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 <mailto:d77hamlett at comcast.net>
>     *To:* discussion at nsrca.org <mailto: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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