YS 140 problem

Mon Jul 25 10:15:40 AKDT 2005

This engine sounds so strong, it though it must be a 140DZ.

Randy

-------------- Original message -------------- 

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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