YS .91 idle setting/ Troy

Tue Apr 8 08:04:37 AKDT 2003

yes low vis...long car ride home yesterday


TN
----- Original Message -----
From: "Terry Brox" <tbrox at cox.net>
To: <discussion at nsrca.org>
Sent: Tuesday, April 08, 2003 9:02 AM
Subject: Re: YS .91 idle setting/ Troy


> You mean "low viscosity oil" don't you?
> ----- Original Message -----
> From: "Troy Newman" <troy_newman at msn.com>
> To: <discussion at nsrca.org>
> Sent: Tuesday, April 08, 2003 10:43 AM
> Subject: Re: YS .91 idle setting
>
>
> > on YS motors all except the DZ the magic number on idle RPM's is
> 2000....not
> > 2200 not 1900....2000 even....The reason for this is at 2000 rpm the
> motors
> > are no longer being force fed fuel...rather they are sucking it.....like
a
> > normal motor....To set the idle you need a tach...trim the rpms to 2000
> even
> > then watch the tach...if it surges slightly up then down and dies off
its
> > lean...if it sets at 2000 and the just dies off 19-18-17 dead...its
> rich....
> >
> > On the FZ style motors (140 FZ, 63FZ and so on....) The 91AC and the
120SC
> > the throttle barrel has a Idle adjustment air bleed screw...On the screw
> on
> > the throttle barrel in is rich and out is lean....In some case you can
> take
> > the screw almost out and its not lean enough. This is the case on early
> > motors with this function.....There are 2 fixes...Take the throttle
barrel
> > out and remove the adjustment screw completely...then drill the hole in
> the
> > butterfly larger...Re-install the screw and you now have more adjustment
> > available as the bigger the hole the more lean you can make it...This is
a
> > rare need...But I have had it happen....The regulator adjustment is made
> at
> > about 3000-4000 rpms.....Set like 3500 even...The watch the tach if it
> > climbs then falls off the regulator is lean...dial it out...If the motor
> > just slows down then its rich....
> >
> > Now at the idle setting if its too rich..before you re-drill the air
bleed
> > hole chances are the regulator is building too much pressure...meaning
its
> > rich anyway....So try to setup the midrange first.
> >
> >
> > OK these are the adjustments.....order of operation is......High end
> needle
> > first...then idle...every change to the low end idle means you need to
> clear
> > the motor out and then reset tot he 2000 rpm and see what happens
> > again....Then once the idle is set re-do the high speed needle....Then
> > re-check the low end...Once they are good then go to the regulator and
set
> > the mid range....The go through the process again...Highend-low end-mid
> > range.....they will all interact a little....
> >
> > another thing with the mid range...If the motor is running fine at first
> but
> > richens up after just a couple minutes of flying then the regulator is
> > probably a little rich...Dial it out...What is happening is as pressure
> > builds too much pressure gets built up and the motor is being force fed
> > fuel....Leaner on the regulator means less pressure...hence less
> > fuel....This is not a fuel pump...It pumps air! and meters the pressure
in
> > the tank.
> >
> > #2 goal is to not get the motors too hot on the ground...If you are
> running
> > more than about 2-3mins on the ground jacking with the setting its too
> long
> > and the motor is hot...Shut it down let it cool off then start
> again...Once
> > they are hot you will never get them set right....so they need to be
> watched
> > when running on the ground...If its good enough to fly..fly it and make
a
> > minor adjustment next flight. The worst thing you can do to a motor is
> > ground run it..jacking with it...It gets hot...In the air the air
flowing
> > past cools thing down....On the ground the prop doesn't move enough air
> over
> > the and around the motor...
> >
> > As the motors break in from new the settings with stabilize....when they
> are
> > new...a richer setting is achieved because the motors parts are tighter
> and
> > make more heat...as the motor breaks in the setting will be too rich to
> run
> > and needs leaning...Usually this is high end and sometimes the low speed
> > idle...but rarely the regulator screw....
> >
> > Starting points......High speed- 2 turns open, Low speed 1.5 turns
> > open...Regulator screw flush with the case...maybe a little inside the
> > case...You will always want the idle a little rich...So transition takes
> > just a few moments....and instant screamin' eagle will make for a hot
> > running motor as the instant throttle up will cause the motor to go
> slightly
> > lean then richen up...You can usually see this in the smoke trail the
> motor
> > has...As the motor will smoke slightly then go away and then smoke
> > more....This is a little lean in the middle...Smoke at the very
bottom-mid
> > range and top end is great...Of course the volume will vary but the
color
> of
> > the trail should be pretty constant....The High viscosity oils like the
> Cool
> > Power Heli Pro 20% or 30% work great in the DZ and also in the std
> pressure
> > systems of the YS....these fuels will smoke a little more.....and I have
> > just started setting my motors based on my tach for idle and my ear and
> the
> > smoke trail...I can tell by flight times and by looking at the trail if
> the
> > motor is too rich or lean.....
> >
> > Ok hope this helps you out....
> > good Luck
> >
> > Troy Newman
> > ----- Original Message -----
> > From: "Craig Miller" <cmiller51 at hotmail.com>
> > To: <discussion at nsrca.org>
> > Sent: Tuesday, April 08, 2003 5:48 AM
> > Subject: Re: YS .91 idle setting
> >
> >
> > > I have an AC that I've been flying with for the last two summers, and
I
> > > don't think I have the idle down to 2000 RPM, maybe at about 2400. It
> > might
> > > be that you have the idle too low (especially for a new engine). All
you
> > > need is an idle slow enough to land, and of course so the ship doesn't
> > start
> > > rolling before announcing your take off!
> > >
> > >
> > >
> > > Craig Miller
> > > Remsen, Iowa
> > > AMA 66900
> > > NSRCA 2255
> > > http://user.midlands.net/cmiller
> > >
> > >
> > >
> > >
> > >
> > > >From: "Keith Hoard" <khoard at midsouth.rr.com>
> > > >Reply-To: discussion at nsrca.org
> > > >To: <discussion at nsrca.org>
> > > >Subject: Re: YS .91 idle setting
> > > >Date: Mon, 7 Apr 2003 17:12:43 -0500
> > > >
> > > >Yup, got that. . . left is lean, right is rich. . . Just came in from
> > > >messing with the low speed needle and it is set good for the
> transition,
> > > >but it still won't idle for more than 20-30 seconds.  I run it full
> > > >throttle for about 10 seconds to pressurize the tank then drop it to
> > idle -
> > > >2000 to 2400 RPM.  The engine idles at this speed for about 20-30
> seconds
> > > >then the RPM slowly decays until it quits, then fuel drips out of the
> > carb
> > > >(engine inverted).  I relight the glow plug, spin the engine and it
> > starts
> > > >right up again and repeats.
> > > >
> > > >
> > > >
> > > >Keith L. Hoard
> > > >Cordova, TN
> > > >klhoard at midsouth.rr.com
> > > >   ----- Original Message -----
> > > >   From: Terry Brox
> > > >   To: discussion at nsrca.org
> > > >   Sent: Monday, April 07, 2003 5:03 PM
> > > >   Subject: Re: YS .91 idle setting
> > > >
> > > >
> > > >   Low speed is an airbleed. Out is leaner, in is richer. Opposite
from
> > the
> > > >high speed.
> > > >     ----- Original Message -----
> > > >     From: Keith Hoard
> > > >     To: NSRCA Mailing List
> > > >     Sent: Monday, April 07, 2003 4:51 PM
> > > >     Subject: Fw: YS .91 idle setting
> > > >
> > > >
> > > >
> > > >     From: Keith Hoard
> > > >     To: NSRCA Mailing List
> > > >     Sent: Monday, April 07, 2003 3:06 PM
> > > >     Subject: YS .91 idle setting
> > > >
> > > >
> > > >     Gentlemen,
> > > >
> > > >        I'm breaking in my YS .91FZ and seem to have gotten the top
end
> > > >working fine, but the engine idles at 2000 RPM for about 10 seconds
> then
> > > >slowly dies.  I don't remember which way to turn the low speed
needle,
> > and
> > > >the YS Performance page seems to have been hijacked.  Thanks!!
> > > >
> > > >
> > > >
> > > >
> > > >     Keith L. Hoard
> > > >     Cordova, TN
> > > >     klhoard at midsouth.rr.com
> > >
> > >
> > > _________________________________________________________________
> > > STOP MORE SPAM with the new MSN 8 and get 2 months FREE*
> > > http://join.msn.com/?page=features/junkmail
> > >
> > > =====================================
> > > # To be removed from this list, send a message to
> > > # discussion-request at nsrca.org
> > > # and put leave discussion on the first line of the body.
> > > #
> > >
> > >
> > =====================================
> > # To be removed from this list, send a message to
> > # discussion-request at nsrca.org
> > # and put leave discussion on the first line of the body.
> > #
> >
> >
>
>
> =====================================
> # To be removed from this list, send a message to
> # discussion-request at nsrca.org
> # and put leave discussion on the first line of the body.
> #
>
>
=====================================
# To be removed from this list, send a message to 
# discussion-request at nsrca.org
# and put leave discussion on the first line of the body.
#