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01-12-2006 11:31 PM  13 years ago
Topic Vote0Post 1
BJames111

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San Diego, California

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os91 sz-h tuning?
I just got this thing and I totally expected a lot more power. I was using a tt90, muscle pipe, and cp 30%, and was pretty happy with it, but the alure of more power caused me to buy the os. I am no pro at engine tuning, but i had my TT engine purring pretty nicely.

I broke in the OS, and started leaning following the instructions as best I could. The thing is, I had to go back to using a revolution muffler, and I bought 15% fuel thinking that i'd try to keep my fuel costs down.

It seemed like my prior set up was more power. I'll be going back to my MP, and cp30%, is that going to be a huge change? If I lean the OS any more, it starts to get a little warmer than I'd like. (finger on the back plate)

What Is a good baseline setting for the mid and high needle on this engine? The manual's setting isn't clear to me. I know needle settings change a lot, but there's a lot of us So Cal guys, and it should be similar...
Help?
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01-13-2006 12:09 AM  13 years ago
ESWLFSE

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Liberty Hill, TX

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Mines still uninstalled, but I read one post on a German forum that stated 15%, 46 degrees, and one click over 1 turn on the mid and 4 clicks over 1 turn on the high. For what thats worth.
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01-13-2006 01:23 AM  13 years ago
Chris.C

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Hong Kong

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My SZ has gone through one gallon of CP30 with Hatori muffler. High speed needle is a one turn and a half, mid needle is at few clicks over one turn. It still sounds four stroke in idle up and the back plate is cold to warm.

I am going to leave the needle setting there until it goes thru another 2 bottles of CP30.

Chris
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01-13-2006 02:17 AM  13 years ago
BJames111

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San Diego, California

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thanks for the reply, how's the weather over there? is it close to southern california? I know my settings will be slightly different 'cuz of the different muffler. At least I know I'm in the ball park.
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01-13-2006 03:50 AM  13 years ago
Chris.C

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Hong Kong

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Weather here in HK: around 15 to 20 degree Celsius day time, dry and sunny.

Chris
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01-13-2006 06:35 PM  13 years ago
MooneyDriver

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Kent, Ohio

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You have to break that motor in before it really makes power. Takes a few gallons.

-Neil
Hey man, why does my lipo get bigger every time I charge it?
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01-13-2006 07:16 PM  13 years ago
timebandit

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In the Sticks, Oxford, UK

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I tuned mine starting with factory 2 turns out high and mid (ran it like this for about 1.5 gallons.
Then did what the manual said.
Tune the low end screw for spool and tranistion to hover. Then tune the top end with hard climbouts.
Only then I leaned the mid needle

Using Magnum 30 with a MP2, it's making tons of power
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01-14-2006 12:44 PM  13 years ago
Swing_racer

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Singapore

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have run mine at rather rich side for the first 20 flights. Now, it rocks ! I'm happy with it. about 1.5 turn out (high)

kevin
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01-14-2006 09:12 PM  13 years ago
MikeO

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Chesapeake, VA

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Received my sz-h today. In a related question, was is the purpose of the enclosed shims? and how would you know that you need them. Also what is the woodruff key used for? Looked in the manual, I couldn't find any info. Thanks

Mike
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01-14-2006 11:45 PM  13 years ago
dbcaster

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Petaluma, Ca

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The key depends on the heli that you use it on but I don't think too many of them use it. The head shims are to adjust the compression for fuel type used. I am using 15% and did not need to add shim. Some that are using 30% have added one shim.
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01-15-2006 02:28 AM  13 years ago
ESWLFSE

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Liberty Hill, TX

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Why the second shim then? It makes more sense that one would be for ~15% and two for ~30%???
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01-15-2006 04:34 AM  13 years ago
dbcaster

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Petaluma, Ca

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That is correct, I believe that there is one installed from the factory. Adding one more would give two shims for 30%.
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01-15-2006 02:19 PM  13 years ago
MikeO

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Chesapeake, VA

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Two seperate shims are included in the box. A .2mm and .1mm The engine is for a 90SE and I'm burning CP 30%. What shims would I use? How would I know that I need to use the shims? Any thoughts on what a woodruff key is used for? That was also in the box.
Thanks.

-Mike
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01-15-2006 02:54 PM  13 years ago
ESWLFSE

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Liberty Hill, TX

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I guess I would feel safer using both them with 30% or certainly the larger one then. I'd rather give up a little power than have some detonation going on that I may not hear?? I don't think I've ever heard of anyone using over 30% in a heli, and bigger engines generally require less nitro.
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01-15-2006 03:06 PM  13 years ago
z11355

rrMaster

New England

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Any thoughts on what a woodruff key is used for? That was also in the box.
to attach certain fans or clutches; depends on the specific
helicopter. The most common methods to fix the fan are

collets
threaded
Woodruff key
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01-16-2006 01:32 AM  13 years ago
MikeO

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Chesapeake, VA

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Ok...Still don't see an answer so i'll ask this. How do I know if I need the shims? Do I risk damage to the new engine if I don't use the shims? (Burning 30% Cool Power)
Thanks

-Mike
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01-16-2006 01:42 AM  13 years ago
Chris.C

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Hong Kong

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I too have the same question myself about the additional shims. I put the 0.1 shim together with the standard one before I started to run in the engine for the reason that I am going to use CP30 all the way.

After 2 bottles of CP30, I removed the 0.1 and then continue with the same needle setting(still on rich side). It looks to me there is no difference. It hovers smooth, no vibration(no foams in the fuel tank), plug looks normal to me.

Now it has gone through 4 bottles of CP30 and the needles still stay the same cause the power is enough for me.

One note: put a header tank. I have a few times the engine quit during aerobatics. Now the engine can run until the main tank is dry.

Cheers,

Chris
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01-16-2006 02:09 AM  13 years ago
ESWLFSE

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Liberty Hill, TX

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More head shims = larger safety margin against detonation with higher nitro fuel. Once upon a time I knew how to calculate an effective compression ratio on a model engine but no more. I'm adding the .2mm shim with my 30% to be safe.

It may run fine on 30% with no additional shims right now but couldn't that change when the temps go up??
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01-16-2006 08:42 PM  13 years ago
MikeO

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Chesapeake, VA

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How would you know that you needed to use the shims? What would be the indications?

-Mike
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01-17-2006 06:13 AM  13 years ago
ESWLFSE

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Liberty Hill, TX

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You would get detonation (pre-ignition) with insufficient head clearance. I've never heard it in a model engine but I think it gives the head and piston top a sandblasted look, kills glow plugs, etc. I am sure someone here knows a lot more about it than me.

Too much head clearance will just cost you some power.
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