Glow Engines Discuss RC glow engines

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Old 08-11-2008, 05:45 PM
  #11701  
rlmcnii
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O.F.,

If H. has run a .62 on a 13.5x6 perhaps that engine will run well with a 13x6 (13x7?).

Maybe you should put it back on the bench with the 13" prop, stock muffler with pressure to the tank, and tune it with that prop. See how it does.

Apparently, the engine became difficult when you went to the larger prop and installed it your plane. You could have a carburetor problem, but it seems that the prop and installation are more likely the origin of your troubles.

Four turns out on the HS is probably far too rich, especially if the engine is slowed by a large prop. Tune it...HS first at WOT and then LS. Adjustment of the LS is a must or the engine will not run properly.

Let us know what happens! Good luck, mate[8D] !
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Old 08-11-2008, 06:04 PM
  #11702  
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I just ran my 2nd .62 a few minutes ago.
Fuel===WildCat 15% with 18% all synthetic
Plug===Fox Miracle
Stock exhaust

Bolly 12.5x6==10,350 home grown for you OF
Graupner 12.5x6==9.950
APC 12x7=====9,950

The HS needle is about 1.75 turns out from bottomed out and will barely run at 3 turns out.
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Old 08-11-2008, 10:42 PM
  #11703  
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Has any one tried a K&B four stroke plug ?? There is a hobby shop going out of buisiness and they have a ton of them , might be around 3.50 each.

Andy
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Old 08-12-2008, 12:04 AM
  #11704  
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Can anyone help me locate a crankshaft and gasket set for an old Saito FA-120. This is the engine BEFORE the last 120 (also discontinued because of the 125.)
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Old 08-12-2008, 12:11 AM
  #11705  
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As far as I know the crankshafts are interchangeable between the early 120 and the 120S.

You can make the gaskets yourself. The valve cover gaskets are the same as the last 120S, 150S, etc

Edit: The cranks are different in the sizes of the bearing journals and are not interchangeable
The Old 120 uses a R6 in the front which measures .325 X .875 X .287 in inches. The rear bearing is a metric 6902 (15 X 28 X 7)

The 120S uses a metric 6000 in front (10 X 26 X 8) and a metric 16003 in the rear (17 X 35 X 8)
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Old 08-12-2008, 12:47 AM
  #11706  
romonte
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Sorry for my English, which I have mounted prop 3 blade on my Saito 125 for a flight pattern?
Thank you
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Old 08-12-2008, 05:03 AM
  #11707  
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Hi all

Can the Saito 125 run on 15% reliably or at least 20% nitro?
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Old 08-12-2008, 05:24 AM
  #11708  
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Magna,

The 15% does fine.

Jim
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Old 08-12-2008, 06:04 AM
  #11709  
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Thanks for the support rimcnii and hobbsy

I hope the photo uploads ok and some one will say wow no you don't do that!
All i can say is the engine has a very broad hsn range that fluctuates with patience.
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Old 08-12-2008, 06:16 AM
  #11710  
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I see a refueler valve, they are famous for leaking and causing exactly the problems you are having. It also appears that the bottom left mounting bolt is banging on the HS needle when the engine moves on the soft mounts.
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Old 08-12-2008, 06:57 AM
  #11711  
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Wondering why a Saito 1.00 runs fine when the LSNV is turned all the way in, i.e., bottomed out? I've been trying to tune out a vibration problem (at half throttle) and discovered that even with the LS needle valve turned in all the way it accelerates without stumbling or burbling. Maybe it runs out of threads before the valve reaches "bottom"? Any suggestions?

Thanks
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Old 08-12-2008, 08:05 AM
  #11712  
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Is the HS needle at absolute peak when you set the LS needle? The two needles effect each other somewhat and since the HS needle has a fixed seat it needs to be peaked to get the LS needle correct, then the HS needle can richened down about 200 rpm without changing the LS setting.
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Old 08-12-2008, 08:12 AM
  #11713  
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ORIGINAL: Hobbsy

Is the HS needle at absolute peak when you set the LS needle? The two needles effect each other somewhat and since the HS needle has a fixed seat it needs to be peaked to get the LS needle correct, then the HS needle can richened down about 200 rpm without changing the LS setting.
Maybe not "absolute" since I was adjusting both needles trying to get it to smooth out. I'll try again paying special attention to the adjustment of the HSNV.
Thanks,
Bob
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Old 08-12-2008, 10:03 AM
  #11714  
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ORIGINAL: RC Specialties

Magna,

The 15% does fine.

Jim
Hi Jim

Is 15% the min recommended nitro level? Am I compromising the optimum performance at 15%. For example the YS need at least 20% to be consider optimized.

The problem in our local hobby shop there is no 20% or 25% available. They skip it from 15 to 30%!
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Old 08-12-2008, 10:23 AM
  #11715  
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Saito specs read 10-30%
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Old 08-12-2008, 10:44 AM
  #11716  
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Thanks for the response. When I spoke with Horizon, they told me that the counter weight on the newer crank is lighter. Would this make a difference? The Horizon people seemed to think so, but they also seemed to be in a bit of hurry to finish with me.

Apparently, the piston and con rod of the newer 120 are lighter. Can the newer piston and con rod be used in the older cylinder?

How does one go about making the complex gasket that's used under the cam cover?

Again, thank you for the help.
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Old 08-12-2008, 11:00 AM
  #11717  
rlmcnii
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O.F.,

A soft mount is not necessary for a .62.
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Old 08-12-2008, 01:10 PM
  #11718  
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As promised, here are the pictures of my AT-6 Texan with Saito FA82.
http://picasaweb.google.hr/rvt464/AT6Texan
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Old 08-12-2008, 02:03 PM
  #11719  
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Very nice looking plane
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Old 08-12-2008, 02:55 PM
  #11720  
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As sodbuster points out, Saito says 10-30%. You asked if the 15% is okay. I run 15% in all of my engines and they perform well. I have not tried the 30% but others claim a performance increase over the 15%. For everyday flying I don't see the advantage vs. additional cost.

Jim
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Old 08-12-2008, 06:52 PM
  #11721  
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Hi Jim and Sod

Thanks! I just want to make at least I can get the fuel from LHS to run the Saito 125.
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Old 08-12-2008, 07:14 PM
  #11722  
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Magna, if you can get 5% nitro fuel, the 1.25 will run just fine on 5%, I have never bought into the old, "engines are easier to tune on 20%" myth. The only Saito that is a little touchy on the 5% fuel is the little .30 and all it needs is to idle slighly faster.
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Old 08-12-2008, 08:16 PM
  #11723  
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All,

I need a few ideas. My trusty Saito .72 has well over 100 hours in the air, and now is showing signs of slowing down. Where it previously would turn 10,500 on an APC 13x6 using 15% powermaster fuel and an OS F plug, it now only does 9800. I've done the obvious, including setting the valves and changing to a new plug. Compression feels good and I can't feel any roughness or play in the bearings. On the positive side, fuel consumption seems to have decreased. I've also run it without the muffler and only picked up a few hundred rpm. It doesn't feel worn out, but I am stumped on getting it back to full performance.

Bob
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Old 08-12-2008, 08:28 PM
  #11724  
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Bob,

Check the cam , if everything else is good, compression , valve clearence , ect . you might have a worn out or wearing cam.

Andy
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Old 08-12-2008, 08:36 PM
  #11725  
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72's are bad about the back plate warping and then the intake will move in and out and you will have a intake manifold vacuum leak. They require a new style back plate and new Orings on the intake manifold
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