[NSRCA-discussion] YS 140DZ tuning question

[Troy A. Newman]

 I would recommend leaning the HS a few clicks and try it out and see if its 
too lean. If its not too lean then fly it and see.

The DZ motors run in a leaner spot of the HS than an pressurized version 
will. Yes it will make great gobs of MOE rich but it will not idle well if 
its too rich and it will shake bad too. Just lean it down a bit and see 
where it wants to be. I usually end up with a fairly new motor about 
1.25turns out. You are a little further away and most like 1/4 turn on the 
needle will solve the problem for you.

Basically a good rule of thumb on any motor is to not be a prostitution 
where if it quits right now you can't make it back. I guess you learned that 
one this time.


Troy
----- Original Message ----- 
From: "Troy A. Newman" <troy_newman at msn.com>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Monday, May 01, 2006 12:42 PM
Subject: Re: [NSRCA-discussion] YS 140DZ tuning question


> Bob,
>
> too rich...most likely on the HS...but could be too much pressure out of 
> the
> pump.
>
> Its no longer a pressure regulator its a pump. This is common when the HS 
> is
> too rich...the raw fuel is dumped into the head of the engine and puts the
> fire out.
>
> Troy
> ----- Original Message ----- 
> From: "Bob Kane" <getterflash at yahoo.com>
> To: <nsrca-discussion at lists.nsrca.org>
> Sent: Monday, May 01, 2006 10:50 AM
> Subject: [NSRCA-discussion] YS 140DZ tuning question
>
>
>> You may have seen my previous post about replacement
>> landing gear for my Temptation which were broken by a
>> "landing" in a farmers field after an untimely
>> deadstick.
>>
>> I could use some DZ tuning guidance. I'm pretty good
>> at setting up the FZ/L series, but this experience
>> does not help much with the DZ.  The deadstick occured
>> on a downline after testing the vertical performance.
>> I pulled the plane vertical and rolled on the throtle,
>> it rocketed straight up. Satisfied with the ample
>> vertical performance, I rolled the throttle back and
>> did a sloppy wingover to get the plane pointed back
>> down. I pulled back to horizontal and rolled the
>> throtle up to about 1/2 and watched in shock as the
>> prop slowed and stopped. You know the rest of this
>> story.
>>
>> Is this a symptom of too rich, too lean, bad plug or?
>> The needle was open 1 5/8 turns, which seemd to be
>> good on the ground. I was running PowerMaster 20% DZ
>> blend, Mejzlik 16X12 prop, OS F plug. The tank is on
>> the CG, YS foam clunk, no header tank. The vent line
>> has a check valve to keep fuel from leaking out.  My
>> plan right now is to bench run the engine to see if I
>> can figure out the needle sweet spot, but I know
>> performance in the air can vary. Any help is
>> appreciated.
>>
>> Bob Kane
>> getterflash at yahoo.com
>>
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