YS 140 problem

[Bob Richards]

Don't feel bad!

I have to cringe a little whenever I see someone using
a tach and then start working on the engine as a
result. Like the guy in our club that kept trying to
tweak his needle, leaning the engine to starvation,
trying to get the same reading he was getting the day
before. Finally he said "I was getting 12,000 rpm
yesterday, now I'm only getting 8000". I looked at his
tach -- he had it set for three bladed props, he was
using a two blade prop. :-)

Don't get hung up on rpms. If it pulls with authority,
and idles enough to land -- run with it.

Bob R.


--- "Daniel J. Hamlett" <d77hamlett at comcast.net>
wrote:

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