YS DZ Fuel Hunger...

[Earl Haury]

Mark

Troy's covered most of the bases. Don't overlook the front seal for oil
leakage - if the front of the engine is wet the seal is the likely culprit.
On fuel consumption, if you are using an open vented tank, loop the vent to
behind the tank - then forward and out. If plumbed directly from the vent
line overboard a lot of fuel will flow out of the vent on downlines.

Earl
----- Original Message ----- 
From: "Troy Newman" <troy_newman at msn.com>
To: <discussion at nsrca.org>
Sent: Sunday, June 13, 2004 10:57 PM
Subject: Re: YS DZ Fuel Hunger...


> Mark,
>
> I can get 11-12 sometimes in calm even 13-14 mins out a 140DZ on a 20oz
> tank.
>
> My guess if this...Too rich for starters....lean it down a bit and see if
> its barking. Just go couple clicks at a time. Next thing is throttle
> control. If you go to Full power much it will eat much much fuel...I'm
> running both the 140's and the 160. The 160 seems to be a little more
hungry
> at times...Windy conditions..
>
> How does your cowl area look...It its just soaking with oil then you have
a
> leak. Look to the head gasket, the o-rings on the intake tube. Since the
DZ
> only has "air" in the intake tube it can leak and you will not know
> it...Then you will need a richer needle setting to accommodate the extra
> air....If its leaking then you have what I tend to call the externally
> lubricated version. I have one of these it is a sloppy pig. I could not
> figure out where the excess oil-fuel was coming from...Then I took it
apart
> and added a 2nd head gasket....The motor is as dry as the other
> externally....It was a fuel hog too. But now is as good as the others.
>
> From the number you give of 8400 on a 17-12 std on 30% Heli/DZ fuel I know
> which brand you are using....This number is high. In fact fairly new 140's
> turn that prop about 8000-8100. You might have a real stump puller. I have
> one of those, and it eats more fuel....Look to trying the carb insert it
> will get you a few more minutes.  Plus it helps manage the afterburner
mode.
>
> The last question is are you flying 24oz dry or is it barking at 9mins
> landing with 3-4-5oz in the tank. If this is the case then your fuel tank
> setup is not the best. Perhaps the line is short on the pickup(clunk in
the
> very very back), or put some foam around the tank to reduce foaming in the
> tank. If you are using the foam clunk...look at the aluminum body and
orient
> the holes horizontal in the tank rather than vertical. This may
help....Also
> what tank? the Dubro and Sullivan tanks are pretty wide footprint. They
get
> a lower depth of fuel quicker. The tettra tanks are more compact and
> sq-like...they will hold the depth level higher in the tank. Works better.
>
>
> Let me know if you find something....
>
>
> Troy
>
>
> ----- Original Message ----- 
> From: "Atwood, Mark" <atwoodm at paragon-inc.com>
> To: <discussion at nsrca.org>
> Sent: Sunday, June 13, 2004 6:33 PM
> Subject: YS DZ Fuel Hunger...
>
>
> Ok all you DZ experts...I need some advice.  My DZ is running
> awesome....spinning a 17x12 at 8400 rpm.  Never quits, seems to idle
> ..fair.
>
> Sooo...here's the problem.  It's slurping down 24oz of fuel in 9 minutes.
> Now I know they're hungry...but they shouldn't be THAT hungry.  It's
clearly
> running rich (that's pronounced "Smoke Trail") and if given time will load
> up slightly on the low end.   The main needle is 1 3/8 out and I'm nervous
> to dial it in much farther.
>
> Am I just being silly...crank it in...or is there something else I should
be
> doing???
>
> Any help would be greatly appreciated!!!
>
> -Mark
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