[NSRCA-discussion] YS140DZ idle question-answer

Tue Aug 1 04:47:09 AKDT 2006

Bob,

Try the Mejzlik  19x10.   I have used it on my OS 1.40 and it worked real
good.   The Mejzlik is much lighter then the APC and spool up is good.  It
flies much like an electric.
OS 1.40  15% Cool Power, Aeroslave c.f pipe set at 26" from plug to first
baffle.  It will run about 7500 rpm.  That seems low on the rpms but it has
plenty of pull. You will have to find the right bushing to make the prop
fit.

I am not sure how it would work on the YS motors thought.

Wayne Galligan

----- Original Message ----- 
From: "Bob Kane" <getterflash at yahoo.com>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Tuesday, August 01, 2006 6:04 AM
Subject: Re: [NSRCA-discussion] YS140DZ idle question-answer

> PowerMaster 30%DZ blend. If I were to buy new fuel
> right now I would buy 20%, no need for 30%, even at 95
> degree F temperatures.
>
> RPM? I don't know, I have not measured it. I will the
> next flying session.
>
> The 18.1X10 is heavy, I had to relieve the openings in
> the cowl due to the increased rotation of the engine
> on the Hyde mount during idle. I'm hoping Mejzlik
> comes out with a similar prop.
>
>
> --- Peter Pennisi <pentagon.systems at bigpond.com>
> wrote:
>
>>
>> Bob,
>>
>> What RPM are you getting with the 18.1 X 10 APC W
>> and what fuel are you
>> using?
>>
>> -----Original Message-----
>> From: nsrca-discussion-bounces at lists.nsrca.org
>> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On
>> Behalf Of Bob Kane
>> Sent: Tuesday, 1 August 2006 1:14 PM
>> To: NSRCA Mailing List
>> Subject: Re: [NSRCA-discussion] YS140DZ idle
>> question-answer
>>
>> No. The DZ series does not use a pressurized fuel
>> system. The fuel is "sucked" from the tank by the
>> fuel
>> pump on the down stroke of the intake pushrod (valve
>> closing), and "squirted" out to the injector as the
>> intake valve pushrod opens the valve. The regulator
>> on
>> the front of the fuel pump limits the fuel pressure
>> by
>> opening when the fuel pressure is sufficient to
>> overcome the spring tension in the regulator. The
>> spring is much stiffer than the spring in the FZ/L
>> series motors. There is no low end adjustment on the
>> carb in the DZ series, so the regulator is used to
>> set
>> the idle mixture. Start the engine, set the high end
>> needle as you would on any other YS, pull the
>> throttle
>> back to idle. If the engine slows down and dies, it
>> is
>> rich, turn the regulator out to lean it. If it
>> speeds
>> up and dies, it is lean, turn it in to richen it.
>> Recheck the high speed needle.
>>
>> These engines will not tolerate restrictive fuel
>> filters. I am currently using a Sullivan Crap Trap
>> to
>> keep the big boulders out of the fuel system and it
>> is
>> working well. I'm still playing with using a check
>> valve on the vent side of the tank. It works well
>> without it but I get some leakage out of the vent.
>>
>> I have recently been through an extensive learning
>> experience with the pump system on these engines. If
>> the fuel lines past the pump blow off the fittings,
>> the pump regulator is set too rich or is sticking
>> closed. If you are having trouble with the
>> adjustments
>> it might be time to have the pump/engine serviced.
>>
>> I will say the power of the 160DZ is incredible, way
>> more than what is needed to pull my Temptation
>> through
>> the Masters sequence. I'm running an APC 18.1X10
>> prop,
>> the thing pulls like a locomotive and slows down as
>> if
>> you threw the anchor out. Vertical uplines, even
>> with
>> rolls are just over half throttle. The only possible
>> disadvantage is the prop is heavy and will probably
>> cause more rapid conrod wear.
>>
>>
>> --- vicenterc at comcast.net wrote:
>>
>> > Eric,
>> >
>> > I got a new YS 160 DZ.  Is this procedure
>> equivalent
>> > for both engines?
>> >
>> > Thanks,
>> >
>> > Vicente "Vince" Bortone
>> >
>> > -------------- Original message -------------- 
>> > From: "Grow Pattern" <pattern4u at comcast.net>
>> >
>> > Michael,
>> >              The big and first thing to remember
>> is
>> > that the DZ uses a pump. If you keep thinking
>> about
>> > the pump as a regulator it may not help you set
>> your
>> > engine. Unfortunately the instructions call it a
>> > regulator. The fuel is metered out to the carb by
>> > the pushrod action and the "pulsating" crankcase
>> > pressure operates the pump side.
>> >
>> > The next thing is that the carb does two things.
>> It
>> > controls the air flow to the inlet valve and the
>> > fuel supply to the injector. Even though the
>> needle
>> > effects all of the fuel flow it is not the right
>> > thing to use to get a good idle. Many people
>> > accidentally/unintentionally override the pump
>> > settings with the main needle to get a good
>> low-end
>> > rpm.
>> >
>> > The "regulator" screw restricts the primary fuel
>> > flow and is the one that you must use to set an
>> idle
>> > and transition. If you get the big brass screw set
>> a
>> > bit too rich it will keep dousing the plug,
>> > especially at low rpm.
>> >
>> > The trick to a good setting is to keep closing the
>> > pumped fuel supply until the engine will not run
>> any
>> > more.
>> >
>> > You do this by turning the big brass screw
>> clockwise
>> > about 1/8 of a turn and then start and warm up
>> the
>> > engine. Keep the main needle at about 1.5 turns or
>> > more and don't worry if it runs a bit rich as you
>> > open the throttle about half way, in short bursts.
>> > Do this again and again until the engine will not
>> > start or keep running at idle or open up.
>> >
>> > You are now very close. Turn the brass screw back
>> > anti-clockwise about 1/8 of turn. and see if the
>> > engine will start and idle. It should be able to
>> go
>> > as low as, and hold about, 1.500 rpm.for about a
>> > minute. If the throttle smoothly increases the rpm
>> > you have a good low-end setting. (Go more "open"
>> on
>> > the brass screw if it is needed to keep it
>> running).
>> >
>> > Now is the time set your top-end needle. It may
>> need
>> > more or less fuel so please open up carefully and
>> > listen for the warning "bark". Richen the main
>> > needle if it barks. If all goes well, set the
>> > high-end needle for max rpm and then richen it
>> back
>> > about 500 rpm.
>> >
>> > After that it should run like a Swiss-watch, start
>> > better, and last a good while. It should not quit
>> in
>> > the air or on the ground.
>> >
>> > Please let me know if this worked for you.
>> >
>> > Regards,
>> >
>> > Eric.
>> > ----- Original Message ----- 
>> > From: Michael Cohen
>> > To: NSRCA Mailing List
>> > Sent: Sunday, July 30, 2006 2:31 PM
>> > Subject: [NSRCA-discussion] YS140DZ idle question
>> >
>> >
>> > OK list, I have a question for you.  I have a
>> 140DZ
>> > that will not idle below 2300ish RPM.  Richard
>> > Lindberg and I have adjusted the regulator, but it
>> > appears to have little or no effect.  I might be
>> > able to get one flight in, but eventually, on a
>> down
>> > line, it will die and 7 dead sticks are not that
>> fun
>> > to try.   Full power seems to hold just fine.  We
>> > figured there might be an air leak, and that is
>> why
>> > it seemed to idle worse after a warm up flight, so
>> I
>> > replaced the valve cover gasket and the other
>> > gaskets at the backplate, but that did not seam to
>> > make a difference.  Anybody got any ideas besides
>> > the usual OS/Webra/Mintor/E-power/power slope
>> > soaring comments?
>> >
>> >
>> >
>> > _______________________________________________
>> > NSRCA-discussion mailing list
>> > NSRCA-discussion at lists.nsrca.org
>> >
>>
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion>
>> _______________________________________________
>> > NSRCA-discussion mailing list
>> > NSRCA-discussion at lists.nsrca.org
>>
> === message truncated ===
>
>
> Bob Kane
> getterflash at yahoo.com
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>
>