[NSRCA-discussion] YS-160 round 1...ding, ding

Sun Jun 1 07:45:42 AKDT 2008

Wow Troy..I'm impressed!!

----- Original Message ----- 
From: "Troy Newman" <troy at troynewman.net>
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
Sent: Sunday, June 01, 2008 10:32 AM
Subject: Re: [NSRCA-discussion] YS-160 round 1...ding, ding

> Jason,
> 
> Regardless of the peanut galleries comments here is the skinny.
> 
> There are two parts...the black plastic check valve....and then the
> Brass Injector that goes into the head. The black plastic part can get
> loose, IF the injector fuel line is allowed to flop around. This is why
> it has a clip on it. Some folks will remove the clip and the fuel tubing
> is allowed to flop. Also some folks seem to thing they can remove the
> black plastic check valve and re-install it. Nope the Plastic goes on
> one time and to remove it the plastic breaks out and the hole is not
> larger from the barb damage.
> 
> The idea is to not mess with it.
> 
> 
> There have been a  few cases of mostly early 160's and mostly a couple
> years ago when the brass nozzle came out of the head. I know of 3 of
> these and one was in Japan, one in Australia and one in the USA.
> Extremely rare, but clean it up and yes I have been told JB weld will
> fix it. My understanding is that this nozzle is pressed in with some
> kind of adhesive at the factory. So the JB weld is the same kind of
> thing....You don't have that problem.
> 
> If the engine is allowed to hit the cowl of the model sometime the black
> plastic check valve will get knocked around....If it gets loose, just
> remove it and hook the fuel tubing direct to the injector nozzle. It
> will work fine. The check valve is there for long extended idles, and
> quick throttle ups.....Think F-07 Double Avalanche. The check valve
> prevents a burp on throttle up.
> 
> 
> If you engine is set properly you won't get the burp anyway...but if its
> just a  touch lean on the pump...then a tiny air bubble can migrate back
> into the injector fuel line. This is because the valve cover is the air
> box...and is under pressure...so the high pressure keeps the fuel from
> coming out of the injector until the valve on the engine opens. When the
> valve opens the pump gives a squirt and the fuel comes out.....
> 
> At idle the engine is not using much fuel at all....and the injector
> will leak a little fuel into the valve cover area....If the engine is
> too rich (pump)...this is what causes it to get a rough idle. If the
> pump is too lean then there is not enough fuel in the line and the
> pressure in the line is lower so the air box pressure pushes the fuel
> back in the injector line and right at the very end of the in injector
> line forms a little air bubble.
> 
> 
> The black plastic check valve prevents this from happening.
> 
> 
> So the long story aside if its flopping around pry it off with a large
> flat blade screw driver, just slowly inch it off...then hook the fuel
> line direct. It will work fine.
> 
> By the way the new 170's have a different clip on the injector line that
> keeps the fuel tubing from flopping around. This keeps the black plastic
> from turning and getting loose on the injector nozzle.
> 
> 
> The peanut gallery can now continue their comments.
> 
> Thanks
> Troy Newman
> 
> -----Original Message-----
> From: nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of JShulman
> Sent: Sunday, June 01, 2008 8:06 AM
> To: General pattern discussion
> Subject: Re: [NSRCA-discussion] YS-160 round 1...ding, ding
> 
> Oh yea... the check valve. Regs in front... duh. Where do I plug in the
> battery???
> 
> I'll check it and make sure I'm just seeing things. We're still learning
> about the new YS's. Maybe it always swiveled and I just now noticed it.
> 
> Regards,
> Jason
> www.jasonshulman.com
> www.shulmanaviation.com
> www.composite-arf.com
> 
> -----Original Message-----
> From: nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Mike
> Hester
> Sent: Sunday, June 01, 2008 10:35 AM
> To: General pattern discussion
> Subject: Re: [NSRCA-discussion] YS-160 round 1...ding, ding
> 
> 
> You mean the check valve? It is press fit. It swivels =)
> 
> As long as it's not loose, it's fine. Sometimes the fitting comes loose
> from the head where it's just pressed in. If that's the case, JB weld.
> But the black part just presses on to that.
> 
> if you mean the part that attaches on to the pushrod tubes, it's just
> plastic and if it's moving excessively, something might have broken.
> 
> -Mike
> 
> ----- Original Message -----
> From: "JShulman" <jshulman at cfl.rr.com>
> To: "NSRCA" <nsrca-discussion at lists.nsrca.org>
> Sent: Sunday, June 01, 2008 10:12 AM
> Subject: [NSRCA-discussion] YS-160 round 1...ding, ding
> 
> 
>> Sooooooooooo.... how do we tighten up the regulator (black piece at 
>> valve
>> cover) on the top of the motor? It seems that this one has come loose 
>> as it will swivel back and forth.
>>
>> BTW Chris... I am still flying electric <G>
>>
>> Regards,
>> Jason
>> www.jasonshulman.com
>> www.shulmanaviation.com
>> www.composite-arf.com
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