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HelicopterAvant RC Avant Aurora - Mostro › OS SZ-H W/pump POS!!!
07-08-2008 05:06 AM  9 years agoPost 1
jjacob

rrNovice

Oakley , California​- USA

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Well With just over a gallon thru my SZ-H , it went lean in flight and died before I could get her down. The main needle was open 2 turns and the mid was open 1 turn.I was checking the head temp after each flight and it was around 180 degrees.I bought the engine in August of 2006, in antisapation of the Aurora.I was glad I still had the receipt with a month left on the warranty.The engine has lost most of it's compression, I can turn it over with my fingers at the start shaft.What is the usual turn around time from Hobby Services?

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07-08-2008 06:14 AM  9 years agoPost 2
ThunderRobo

rrKey Veteran

Toronto, Canada

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What does this have to do with an aurora?

Hobby Services are actually pretty quick, 4-5 day turn around on their end.

Derek
Da' kid with the toyz!
"Time for some Muzak!"

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07-08-2008 02:39 PM  9 years agoPost 3
JA Allen

rrApprentice

Waxhaw, NC

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Two turns out should have been a tad rich, so thats not it. Something might have gotten through and clogged the needle or the fuel inlet, or clogged the filter, (if you are using one) causing that engine to go lean and overheat, killing the ring and liner.

When you drilled the tank for the exhaust nipple, (because your using a non-pumped SZ) did you make sure all of that plastic from drilling was out of the tank? Even if you think you did, some will remain that you cant see, so its best to rinse with fuel after words, to make sure it was all out. That can build up against a filter, or needle seat and clog fast. Or even clog the clunk or fuel magnet.

The SZ without pump I have been using, more than one, and are fine, Maybe you did have a bad carb (Machining debris in carb, whatever)

Just giving you some ideas to check. Take it apart, (Carb and tank) and/or check lines and investigate. I bet the flow is obstructed someway, they wont go lean like that from being defective, this was a slow lean, as it ran long lean and cooked. That is indicative of a fuel flow problem. Could also have been a folder clunk line in the tank, or soggy clunk line. Clunk fell out. After only a gallon, probably not, but you never know. Maybe even the brass inlets in the tank stopper had restriction from cutting, just enough to impede a good high end setting to be lean.

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07-08-2008 04:48 PM  9 years agoPost 4
jphilli

rrKey Veteran

Atlanta, Ga.

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You could also have had an exhaust leak. My SZ is 2-3 years old now and it's been flown really hard and it still flies great.

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07-08-2008 05:40 PM  9 years agoPost 5
RPMATLANTA

rrApprentice

Cumming GA

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turn around time

I just sent a os 91 sz hp by two day ground on the 27th of June and got a estimated return date on July 2nd for a return or ship date for July 10. I think that is pretty good with out doing over night! I had the same thing happen, it just flamed out in flight. Needle setting were fine but no matter they fixed it for free except for shipping. It was a year old engine with maybe 30 flights.

Team Horizon Pilot
Take offs are optional! Landings are not!

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07-08-2008 07:36 PM  9 years agoPost 6
jphilli

rrKey Veteran

Atlanta, Ga.

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Hey RPM, what club do you fly at?

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07-08-2008 11:55 PM  9 years agoPost 7
Doug L

rrVeteran

Minnesota

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The title of the topic says it's with pump?

If so, bad regulator? Mine had over 30 gallons before the regulator went bad. Otherwise a very consistent smooth running engine.

-----------------------------
www.3DRCMN.com

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07-09-2008 12:04 AM  9 years agoPost 8
RappyTappy

rrProfessor

North Denver,​Colorado

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My OS .91 SZ PS did the same thing in 4 tanks on my Aurora back on 06'. Get the non-pumped and either run it stock or a do a cline, I'd avoid the os pump like the plague.

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07-09-2008 12:34 AM  9 years agoPost 9
Dood

rrProfessor

Wescanson

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Thats where I'm at right now with my pumped SZ on the Aurora.

6th tank the pump went titz up, resulting in a forced auto.
The pump is removed, and I'm left with the OS regulated carb.

Right now I'm playing around with crank pressure & the OS regulated carb.

  ▲
▲ ▲

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07-09-2008 12:35 PM  9 years agoPost 10
rcnut

rrElite Veteran

Rockford, Illinois

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Why not just switch to the YS 91 SR? Is the YS a better motor??

.

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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07-09-2008 12:47 PM  9 years agoPost 11
RPMATLANTA

rrApprentice

Cumming GA

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I wouldn't say better

They are both fine motors with different charachteristics! Once again to each their own! One nice thing for sure about the YS Sr is that its $50.00 + cheaper than the OS but that only applies if your starting from scratch. I wouldn't bail on the engine I already have if there was a chance it could be fixed cheap. They only charged me shipping to replace all internals in my OS 91 sz ph! Its like everthing else mechanically produced in this world, all brands have there ringers and duds. I know fellow pilots who have gone years on either brand of engine with out problems! More times than not we have probably done the damage unintentionally by adjusting to much on the needle valves or running with an exhaust leak!

Team Horizon Pilot
Take offs are optional! Landings are not!

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07-09-2008 12:52 PM  9 years agoPost 12
Heliguychris

rrKey Veteran

Perth, West​Australia

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Ya know, the pumped version has no more power than a well set up non pumped. Any chance the pump died? What type of pump was it?

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07-11-2008 03:07 PM  9 years agoPost 13
Havoc

rrElite Veteran

Ky.

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I had the cursed SZ with pump as well. Mine never died but would go lean to the point I'd hit throttle hold or I also found you can bump the collective and knock it out of that lean spot. You can also use muffler pressure but that is not why I bought a pumped engine. I think the fact that this is a crap engine is a poorly kept secret within the OS clique. I replaced the pump and reg three times. Now I run a non pumped with cline mod.

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07-11-2008 10:43 PM  9 years agoPost 14
airboss

rrElite Veteran

OC ,california

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the pumped engine will go lean if the preassure tap isnt being used. that engine performs much better on lean settings and it wont run the propper needle setting without preassure from pipe.

Urukay HPS3 KSE 700 HPS3

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07-11-2008 11:05 PM  9 years agoPost 15
John Benario

rrVeteran

Las Vegas

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The SZ has vibration issues, but the pump/regulator combo works very well. Of course make sure there is no trash in the regulator. If it is going lean in the midrange try running muffler pressure. With muffler pressure you will probably have the opposite issue, the midrange will be rich with the hover needle all the way in. The stock SZ head is undercompressed, make sure you are only using the one 0.008 shim that comes installed on the engine. If you have previous engines, the blue head from the pump C-spec is the best running head of all the OS 90 heads. The Viperhead also runs well, with one 0.008 and one 0.004 shim. The blue pump C-Spec head is the OS head that is closest to the Viperhead, although the Viperhead is slightly higher compression than the blue pump head, thus the extra half shim.

John Benario

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07-11-2008 11:25 PM  9 years agoPost 16
Heliguychris

rrKey Veteran

Perth, West​Australia

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You can also use muffler pressure but that is not why I bought a pumped engine. I think the fact that this is a crap engine is a poorly kept secret within the OS clique.
The OS SZ-H will not run properly with out muffler pressure. You guys that are having dramas with ya pumps,, your using the usual filters, clean fuel etc...? Any kinda artifact in ya fuel may well be hurting ya engines, pumps, etc..

Another one of my pet hates is the poxy fuel line most of the manufactures give ya for inside the tank. Had this TZ chopper that when ya sucked in one one end of the fuel line that would go in the tank, the whole pipe would collapes on itself, it was so flexible. YA could just imagine what was happening to it under full throttle.

Before i started mixing my own fuel at my LHS, i was getting my filters full of lint, after every gallon. What caused it was the guys mixing the fuel were sure trying hard, the were cleaning all the plastic mixing containers with cloth, which was leaving behind the lint,,, juss a thought...we now use microfibre cloths.

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07-12-2008 02:29 AM  9 years agoPost 17
RappyTappy

rrProfessor

North Denver,​Colorado

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Wierd my 3 SZ engines never had vibration issues, maybe its cause I high point and dial indicate? As far as shims, it ran great with all shims, both .0008 and .0004. When I tried .0004 only it ran crappy, not smooth, detonating basically all the signs of overcompression on 30%, so maybe that why people have vibration issues with the engine cause they don't have enough shims.

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07-12-2008 04:11 AM  9 years agoPost 18
airboss

rrElite Veteran

OC ,california

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never had any trouble with my pumpers and I use muffler preassure .

Urukay HPS3 KSE 700 HPS3

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HelicopterAvant RC Avant Aurora - Mostro › OS SZ-H W/pump POS!!!
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