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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › ?'s about the 91 SZ-H
02-12-2006 04:39 PM  12 years agoPost 1
Blademan7065

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Greenfield, Ma.

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I want to know if anyone has had to do any mods to the SZ-H out of the box to make it run well?

Can I take this out of the box put it in the heil and expect it to run like the Hyper 50 as far as reliability? I like to fly not screw around with my motors every time I go to the field. Don't get me wrong, I know that there is some adjustments that go along with glow motors.

Just looking to get somthing reliable and stable.

Thanks

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02-12-2006 06:20 PM  12 years agoPost 2
Jerry Sudimick

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Connecticut

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The current version available has been reported to be a great engine when used with muffler pressure. OS put a larger cateye in the 60M-C carb, which eliminates the absolute need for a pump or regulator system for all but the most demanding users.



Jerry

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02-12-2006 07:19 PM  12 years agoPost 3
robhurlin

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Pretoria, South Africa

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I dropped mine into the R90, set the needles to 2 1/2 turns out as per the book and hit the starter. She started first time & I took her out to the flight line and flew out the tank! I'm about 1 3/4 turns out on the mid needle and 2 turns out on the top needle after 12 tanks and she is still perfectly consistent and reliable and starts first time every time (if I remember to release the fuel clip!). The idle screw started at mid point and is now about 30deg leaner - easy to set! I am flying with an MPII on 15% Nitro and already have lots of power even before she is fully run in.
I maidened my 50SE with new Hyper 2 weeks after the 91SZ and have exactly the same experience at the flight line - start her up, carry her out and fly They are both great out-of-the-box engines and a total pleasure after the TT experience.

Rob.

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02-12-2006 07:21 PM  12 years agoPost 4
Blademan7065

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Greenfield, Ma.

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That is what I wanted to hear. I am tired of messing around with motors half the day at the field in order to get flying. Got two on order.

Cant wait to get them.

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02-12-2006 07:47 PM  12 years agoPost 5
DOKEY

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Northamptonshire UK

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I know it is hard to believe, but this OS91SZ definitely has no DNA from the C-Spec engine.

From the running I have had on mine it does not need any mod what so ever.
I am running the factory installed 0.2mm washer, WC 30%, OS8 plug, MP2 and about 15,500 RPM (engine)

Ryan.

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02-12-2006 07:51 PM  12 years agoPost 6
robhurlin

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Pretoria, South Africa

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I feel the pain - I battled for 3 years with engines. Firstly with the TT36 on my R30v1, then I put an Irvine 39 in and had incurable wa-wahs. Sold it and got the R60 with TT70. The engine threw the ring after a few flights & I got a boom strike after the third time the engine quit - I was too low to autorotate that time. I upgraded to the R90 and paid in a bit extra on the new replacement TT70 (fourtunately replaced under guarantee) to get the TT90. Had endless hassles with needle settings and the engine losing power in the air although set very rich etc. Finally in November last year I lost patience and pre-ordered the new 91SZ from cyberheli before it was even released. It arrived on 20 Dec and first flight was 24 Dec! Finally the 3 year drought was over & I have been enjoying myself every time I go to the club - especially since the 50SE with Hyper came on line on 8 January. Now I enjoy flying instead of fiddling with the engine!! BTW the SZ worked perfectly on muffler pressure (MPII) without a header tank. It was even better with the header tank when I fitted it 2 weeks ago.
I'm sure you will love your SZ when it comes! Let us know

Rob.

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02-12-2006 08:42 PM  12 years agoPost 7
Blademan7065

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Greenfield, Ma.

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Thank you for your reply, I will certanly let everyone know what I think. I am starting to get a warm fuzy feeling about this motor

Thanks again

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05-29-2007 07:02 PM  11 years agoPost 8
Jef

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Baku, Azerbaijan

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Hi.
Is there any need of the gasket for the O.S. 91SZ

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05-29-2007 07:05 PM  11 years agoPost 9
Jef

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Baku, Azerbaijan

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did you use any gasket for your O.S. .91 SZ-H

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05-29-2007 09:32 PM  11 years agoPost 10
robhurlin

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Pretoria, South Africa

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Jef, on 20% nitro I am using the engine straight from the box with no problems and I'm still very happy with it. On 30% Nitro you should put one of the supplied extra gaskets/shims under the head. Some report flying without it but most advise using one - do a search to see which one is recommended.

Rob.

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05-30-2007 08:50 AM  11 years agoPost 11
Jef

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Baku, Azerbaijan

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thanks for the usefull advise

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05-30-2007 02:10 PM  11 years agoPost 12
Jef

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Baku, Azerbaijan

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My engine with the enitial set up exactly 2 turns with first tank worked well but after it works only with the glow plug on

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05-30-2007 04:11 PM  11 years agoPost 13
robhurlin

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Pretoria, South Africa

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That usually means the glo plug needs replacing or the mixture is too lean/rich on the bottom end. The mixture adjustment screw should be about 30 to 45 degrees in (leaner) from the center position.

Rob.

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05-31-2007 02:24 AM  11 years agoPost 14
StEdgar

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Las Vegas, Nevada

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Shims
I purchased a slightly used 91 SZ and it runs pretty well. I have a question about the shims everyone talks about. Where if I need them can I get the shims? Rick's, Heliproz, etc?

Thanks

Mike Mass invented CCPM, Inverted Flight and he did it all before 1980

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05-31-2007 11:07 AM  11 years agoPost 15
Jef

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Baku, Azerbaijan

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Thank you Rob. I will try this weekends

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