Glow Engines Discuss RC glow engines

Welcome to Club SAITO !

Old 09-19-2007, 06:05 PM
  #8501
w8ye
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Throw it together and go. The ring if you disturbed its location will reseat itself in that engine during the first tank of gas.
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Old 09-19-2007, 07:20 PM
  #8502
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I just realized that this thread has been going for over 2 years now (Aug 28, 2005 was the first post).

I have a question regarding the exhaust on my Saito .82. It's a M12x1 thread, about 40mm long. It's just the wrong length to put into a Funtana X 50 that I'm planning.

About the only thing that I can find regaring an exhaust extension is a 5" extension for about $56 and that's a bit much. I'd like to get a manifold about 50mm long, but can't find anything. I even contemplated fabricating one, but a die would cost me $32 to $55 depending on type/style.

I also have a second question. On the existing exhaust manifold, one end is squared off, and the other end has a 'relief' cut in it. Which end goes where? I didn't see anything in the instructions pointing this out. I think that the squared-off end goes into the cylinder while the end with the relief cut in it goes into the muffler. Is this right?

Thanks for any help/light you can shed on this,

Bob
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Old 09-19-2007, 07:31 PM
  #8503
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N1EDM,

Have you thought about going shorter and coming out of the bottom of the cowl with the exhaust? Are you mounting inverted or horizontal?

Jim
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Old 09-19-2007, 07:59 PM
  #8504
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Hi Jim,

I was going to mount horizontal, per the instructions. I hadn't thought about the exhaust inside the cowl. I suppose that I could cut a nipple down and mount it close. Then just put a piece of tubing on the outlet. Is that what you were getting at? And, are there already some short nipples cut to the right size, or do I jsut take a Dremel cutoff wheel to the one that I have?

Also, do you know which end of the manifold goes into the exhaust and which goes into the engine?

Thanks, Jim

Bob
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Old 09-19-2007, 08:31 PM
  #8505
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N1EDM,

As for the manifold, I don't think it really matters unless it is screwed in against the the flange in the engine. Most of the time it is screwed in and backed off for positioning and the jamnut tightened.

If you mount horizontal you may be able to use the stock arrangement. If you need more flexibility use a 90 degree adapter. The stock manifold and muffler would fit that as well. Check out my AD# 321647. It shows a photo of a stock muffler with the 90 adapter. It will give you an idea of possibilities. Good luck.

Jim
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Old 09-19-2007, 09:41 PM
  #8506
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I've a problem with my horizontally mounted Saito 72 on a Sportsman Aviation Corby Starlet. It has a remote glow, Sullivan fueler, and right angle adapter on the exhaust to keep the muffler in the cowl.

Broke the engine in just fine, followed the instructions & Saito site to the letter. High speed peaks at 10,400 rpm with 13x6 APC prop, set it for 10,000 rpm. Problem is the low speed needle setting. I can lean it out and get the idle down to ~2600-2700 rpm with good transition, but after about 20-30 seconds idling, the rpm drops off (say to 2200-2400 rpm) and the engine is really not broken in enough to run reliably down there. This makes for interesting (read hot) landing approaches on calm days. I've noticed this problem doesn't happen if I leave the glow driver on, so I've put in new OS-F and/or Hangar 9 3011 plugs but nothing really changed.

Anyone ever have such a problem? Any suggestions?
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Old 09-19-2007, 11:47 PM
  #8507
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This note is for EdBerg. I had a Saito 91s cyl that was worse than the one shown. I sent it to Clarence Lee and for $28.50 he did a fantastic job on it and now the eng runs great and the exhaust port is stronger than ever. Send it to Lee and he will fix you up. You pay the shipping to him and he repairs it and pays the shipping back to you for $28.50. and the turnaround time is good too. A new cyl is around $100.
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Old 09-19-2007, 11:59 PM
  #8508
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This is general info for anyone who has need of it. I have several Saito engs and none of them had velosity stacks on them. I was always getting a lot of fuel coming from the carb and spraying all over making a mess. I just made a velocity stack for one of my 91s and could not believe the difference it made. The fuel mess behind the eng cleared up and the eng runs much better. The eng will sit and tick over slowly like a fine watch and seems better on top end also, and did I mention the no mess part? Now I have to find out if I have any more tubing to make more stacks.
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Old 09-20-2007, 12:06 AM
  #8509
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Redball I think your idle mixture is still a little rich
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Old 09-20-2007, 01:07 AM
  #8510
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Just found Club Saito - better late than never! Seems to be many Saito experts here, so I'm hoping someone can help resolve an annoying problem I'm having with my Saito 125.

I have a GP Venus II with the Saito 125 mounted inverted. The plane is built per the mfg recommendations, including mounting the tank right behind the firewall so the distance to the engine is only a couple inches. I built the plane about 6 months ago with the intention of using it for a practice plane for Intermediate pattern ( I use a Focus II / OS140 RX for competition).

For several months, probably 50-75 flights, everything was great. Not an excessive amount of power, but adequate, and it ran like a clock. In fact, things were going so well with it, I used it in one contest when the Focus had a problem and won the class. The next week in practice, I had a couple dead stick landings. Each time I did the outside loop from the top, the engine would sag and die just before the loop was completed, say at the 10 or 11 o'clock position. All other maneuvers are done without problem and the engine runs fine.

I assumed a tank problem, so I completely rebuilt the tank with new tubing, even added a YS clunk with the foam cover. Also remounted the tank in foam rubber to eliminate the possibility of foaming in the tank. No luck, still cut out in exactly the same place on each outside loop. Frustrated, I added a Perry Oscillating pump (VP-20). After some tinkering with needle settings, it ran ok, about the same as without the pump. Test flight - this had to cure the problem - but no, same result: engine quit as the loop is being completed. Now I'm beyond frustrated; kept trying different needle settings, anything I could think of. Finally, on a day too windy to be trying to slove this problem, it quit and I didn't make it back to the runway. Scratch on Venus.

I really liked the plane so I got another one. Built it with all the new hardware, including a new tank ( but I did reuse the YS foam clunk). Flies great, just like the first one - including the engine cut out on outside loops!!! AAAARRRGH!!!!!

I'm at a loss for things to try next. I've come to the conclusion that the problem must be in the engine itself - nothing else left. The engine has great compression (I have adjusted the valves, changed plugs - OS#8) starts easily, idles at 2200rpm, transitions perfectly and runs a steady 82-8300rpm using an APC 15x8 prop and Magnum #1 fuel. Our field elevation is 6500ft, so power is down from what you get at sea level. In level flight, verticals, hammerheads, spins, inverted flight, inside loops, snaps - you name it - it'll run all day. Just don't do an outside loop from the top!

Anyone have a problem like this? Any inputs greatly appreciated.

Jack
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Old 09-20-2007, 03:16 PM
  #8511
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I have used 1/8 aircraft ply with 320 sandpaper glued to both sides. Have done this on a 91 saito so prop will clear cowl. I cut mine with a 1" hole saw and enlarge the center hole as needed. This is very light and presents no vibration problems. Place it between prop or spinner backplate and the engine and TIGHTEN it. Good luck.
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Old 09-20-2007, 09:30 PM
  #8512
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Saito experts here! Great, i'll ask a question too. exhaust pipe on a 82. I purchased #SAI65111 (elbow and flex pipe aprox 6" long, 12mm thread) trouble is, it has no pressure fitting for the fuel tank. What do I do? No threads at the end either. I thought I could put the straight muffler on the end of the flex pipe. HELP thanks Ricky.
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Old 09-20-2007, 09:43 PM
  #8513
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Is the pipe supposed to act like a muffler? And, I wonder if you could tap for a pressure fitting, and if so, how good would the pressure be? I see some flex pipe fittings on the Horizon website but they're for 10 & 14MM as well as for the 450. The .82 is 12mm, I believe.

I'd be interested in this answer too,

Bob
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Old 09-20-2007, 09:43 PM
  #8514
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http://www.horizonhobby.com/Products...D=SAI182TD1112

http://www.horizonhobby.com/Products...D=SAI182TD1111
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Old 09-20-2007, 09:49 PM
  #8515
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http://www.horizonhobby.com/Products...rodID=SAI65140

http://www.horizonhobby.com/Products...rodID=SAI65143
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Old 09-20-2007, 09:51 PM
  #8516
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Thanks. Still wondering how this one is to be used SAI 65111 ? maybe for pump only engines? Will they run good without a pressurized fuel tank? Ricky
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Old 09-21-2007, 07:18 AM
  #8517
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Ricky,

Without a pump you will need the muffler pressure to the tank.

Jim
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Old 09-21-2007, 06:29 PM
  #8518
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Where can I send one of my motors to be rebuilt?
Any good rebuilders out there.?


I know its probably in this thread somewhere, but its kinda a big thread and Im too lazy

Sorry
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Old 09-21-2007, 07:15 PM
  #8519
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You can send the engine to these people

Frank C Bowman
1211 N Allen Ave
Farmington, NM 87401-3568
505-327-0696
ringmaster46@msn.com

Bill Jensen
51 Hillside Dr.
Beacon Falls, CT 06403
203 888 4819
WBillJensen@cs.com
www.bj-model-engines.com
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Old 09-21-2007, 07:23 PM
  #8520
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What is the problem (he said, just being curious). Is the motor broken or just running poorly?

Have you contacted Horizon Hobby tech support yet? I'd be curious to see what it's like to deal with them.

Just my $.02

Bob
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Old 09-21-2007, 07:26 PM
  #8521
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Oops, sorry W8YE, your post and mine crossed in the ether. Else, I wouldn't have posted mine.

Bob
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Old 09-21-2007, 07:26 PM
  #8522
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I own a brand new Saito 120S that I have had for about two years. On the box it says FA 120S and then right next to the S there is a small white circle with the letter H inside the circle. The white cirlce appears to be a sticker very intentionally placed and it is on both sides of the box. The side of the engine has a small plate that says 120S. Can anyone tell me what the white circle with the H, that immediately follows the box lettering FA120S, means. Is this engine somehow different than a standard Saito 120? Thanks.

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Old 09-21-2007, 07:30 PM
  #8523
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Quote:
ORIGINAL: N1EDM

What is the problem (he said, just being curious). Is the motor broken or just running poorly?
Its a old .100 with lots-o-hours on it. It needs some TLC...
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Old 09-21-2007, 07:54 PM
  #8524
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There were two 120S models.

the first one had a tubular intake like the Saito 125

The last ones had a compression nut holding a cast intake manifold just like the Saito 150
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Old 09-21-2007, 08:56 PM
  #8525
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I am ready to make my membership official. My saito 90t showed up today and I am stoked. It looks great on the nose of my recovered BlueMax. Should sound and fly great. Will have longer pipes like on the se5's. Not completely finished yet but getting really close for dawn patrol maiden.

See ya,
Rod
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