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Old 02-05-2010, 11:23 AM
  #16851  
Sharpeye22
 
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ORIGINAL: w8ye

I seriously doubt that will work for it is the cam for the left cylinder on a horizontal opposed twin Saito 100T. It will fit but I'm not so sure about the timing as that cylinder has the intake where you have the exhaust.

The number I gave you was for the rear cylinder on the inline twin 100Ti which runs the other direction on the cylinder with the intake and exhaust where they are now on your engine. But the cam doesn't fit the 56.

You are going to have fun setting the cam timing with the cam you ordered.

The engine will run but I don't think it will run with the same power like your other engine.


Horizon stated that the cam came with a dot at one location and a slash at another location. They said on my engine to place the slash at the 6:00 position with the engine at top dead center. It is on its way to me so I will soon see if they are correct.

Thanks for the responce.

Sharpeye
Old 02-05-2010, 01:51 PM
  #16852  
mike early
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Looking forward to results
Old 02-05-2010, 04:09 PM
  #16853  
w8ye
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Default RE: Welcome to Club SAITO !


ORIGINAL: Sharpeye22


ORIGINAL: w8ye

I seriously doubt that will work for it is the cam for the left cylinder on a horizontal opposed twin Saito 100T. It will fit but I'm not so sure about the timing as that cylinder has the intake where you have the exhaust.

The number I gave you was for the rear cylinder on the inline twin 100Ti which runs the other direction on the cylinder with the intake and exhaust where they are now on your engine. But the cam doesn't fit the 56.

You are going to have fun setting the cam timing with the cam you ordered.

The engine will run but I don't think it will run with the same power like your other engine.



Horizon stated that the cam came with a dot at one location and a slash at another location. They said on my engine to place the slash at the 6:00 position with the engine at top dead center. It is on its way to me so I will soon see if they are correct.

Thanks for the responce.

Sharpeye
That's the way to set that cam. Double check that the valve overlap is centered over top dead center of the piston.
Old 02-05-2010, 09:26 PM
  #16854  
mileshawk
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I think the problem is that my engine is probably 25 years old. it has open pushrods and rockerarms . the carb is different from the 30s ( on the horizon site) as the carb body fits, with O ring seal into a curved chromed intake tube which is secured with a set screw into the head. The idle mixture adjustment is a knurled knob out side the throttle arm. this is one of the first mass produced 4S engines available. I do not think that Saito supports this model any more. I was hopping that i might find someone with a stash of a old parts on this site. As soon as i get my camera back i will send some pictures. Vic
Old 02-06-2010, 09:14 AM
  #16855  
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Default RE: Welcome to Club SAITO !

w8ye
is there a way to make your own gascets
Old 02-06-2010, 10:03 AM
  #16856  
w8ye
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yes, you can use magazine covers

cut the interior - install in place and fasten down

then trim off the out outside
Old 02-06-2010, 10:16 AM
  #16857  
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Please note that the cam cover gasket has to be a specified thickness to properly set the cam gear lash. I don't know this number, but I am sure W8YE or BLW do. Magazine response cards (blow ins) are thicker than covers and may work for some gasket applications. Good luck.

Old 02-06-2010, 11:10 AM
  #16858  
w8ye
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The magic number quoted by Bill Robison was .007" but I measure the new ones I get and one was .012"
Old 02-06-2010, 05:36 PM
  #16859  
glowplugboy
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Another question regarding getting my .72 to idle reliably on a 3D profile. Is tank placement a possible issue? The reason why I ask this is:

1. I put the airplane up on a wing tip so I could adjust the idle mixture screw with the engine running. Therefore, the engine is now in the "upright" position and the tank is about an inch and a half below the carb centerline.

2. Low and behold, the idle settles down in this upright position, a steady 2,500, excellent transition, no problems. Idle screw is even with the plasitc throttle arm.

3. I proceed to put the plane back on its landing gear, and within seconds the idling engine sputters and stops.

4. The tank center is right on the centerline of the carb. Could it be loading up the carb in this side mounted position?

5. Would anyone care to guess if lowering the tank below the centerline of the carb might help?

I have been playing with four strokes for 30 years now, and if I can't get this motor to idle reliably soon, I'm sending it back to Horizon to let them look at it. I have never had a problem with a Saito until this .72.

Thoughts???? Ideas? And yes, all the obvious troubleshooting has taken place: new tank, new plug, fresh fuel line, balanced prop, properly set valves, fresh fuel, and so on.
Old 02-06-2010, 05:52 PM
  #16860  
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Default RE: Welcome to Club SAITO !

my first thought would be a hotter plug, like an OS-F... but you may have already tried that.

That could explain how it would run nicely at idle with the cylinder pointing up, but drown out when the cylinder points. down. You might also look at your tank pressure line.. make sure that it's connected well and providing good pressure to the tank. Other than that, a trip back to Horizon might be in order.
Old 02-06-2010, 06:14 PM
  #16861  
glowplugboy
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Yes, OS "F" plug, tested perfectly. Pressure fuel line is attached around the nipple. I'm going to lower the tank and see what happens.
Old 02-07-2010, 12:30 AM
  #16862  
Campgems
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A few years back, I aquired a Saito 45 with both the mounting lugs broke off at the front hole. I found a new crank case and ordered some new bearings and did a rebuild. The Gaskets were all still in one piece so I didn't use new ones. Well, I ran into two issues. When I tightened down the cam housing, it locked up. No wink on the gears and almost impossible to turn the engine over. The second issue was the back plate, It was dragging on the crank pin. I cut some shims from a coke can and all was well again. I still used the old gaskets in addition to the shims. I didn't measure the gear wink, but the engine ran very stong, so I expect it was OK. Maybe a new set of gaskets would have prevented this extra work. Who knows?

Don
Old 02-09-2010, 07:26 AM
  #16863  
Rudolph Hart
 
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Many thanks to the late bill robison and economy of words,his explanation of cam timing is brilliant,again many thanks.Changed a crankshaft in an 82 and bearings in another today.Nobody told me saito pistons suck so hard when you pull the the conrod end down after you remove the head,good valve seal
Old 02-09-2010, 09:18 AM
  #16864  
Hobbsy
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Hey OF, we have much snow here and even mucher cold. Opening either valve or removing the glow plug makes movin that piston easy peazy.
Old 02-10-2010, 07:00 PM
  #16865  
dirtrod
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Default RE: Welcome to Club SAITO !

Hey guys havn't posted in a while but have been keeping up with everyone.
I have a little problem with my saito 100 the durn header has broke off at the
head after about 20 flights, not sure why the prop was balanced, the motor mount
is the factory one that came with the plane. The plane is a H9 Ultra stick. I have
had this happen in the past with a os .91 but never with one of my babys(SAITO's)
The os was replaced by hobby services do to exesive internal vibration. Just
looking for a little help to decide what should be my next step.

Thanks for any help,
Ty
Old 02-10-2010, 07:11 PM
  #16866  
mike early
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It gets loose and the vibration causes it eventually to break. Next time, use teflon plumber's thread tape and re-tighten when it's hot.
Old 02-10-2010, 07:38 PM
  #16867  
dirtrod
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Default RE: Welcome to Club SAITO !

Thanks Mike so it more than likely came loose during flite and then broke? It
did come loose one time before but put a good tightening (i thought)and had
flown several flights before this happened.Is it possible that when it came loose
before it stressed it and then finally broke?
Thanks again,
Ty
Old 02-10-2010, 07:59 PM
  #16868  
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Default RE: Welcome to Club SAITO !

Ty,

You may want to consider a TurboHeader to replace the stock muffler and pipe. Ask Mike Early how he likes his. Let me know if I can help.

Jim
rcspecialties.net
Old 02-10-2010, 08:16 PM
  #16869  
dirtrod
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Jim, u must have read my mind i had thought of that and have heard all the good praise
about them, i will get back to you when i've made my decision,not sure how long i'm going to
keep this plane but i do have a dozen or more saito's i am thinking of one for one of my .65's
i have three of them. what size range does the one for the .65 fit or does it only fit the .65?
Thanks,
Ty
Old 02-10-2010, 08:21 PM
  #16870  
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Ty,

My apologies to the forum. I meant to send a PM. I will send you a PM to discuss this.

Jim
Old 02-10-2010, 08:52 PM
  #16871  
Hobbsy
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Ty. here is an example of what you can do with a TurboHeader (s) using the 90 degree adapter, it makes a very flexible set up.
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Old 02-10-2010, 09:13 PM
  #16872  
w8ye
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The Turbo Header weighs a lot less than the original Saito exhaust system
Old 02-10-2010, 10:17 PM
  #16873  
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In the case of the 2.20 the TurboHeader weighs half as much
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Old 02-10-2010, 10:43 PM
  #16874  
mike early
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Saito Mfg needs to get off their asses and start buying TurboHeaders as fast as the good man Jim can make them, and include them with their engines.
Old 02-10-2010, 11:03 PM
  #16875  
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Default RE: Welcome to Club SAITO !

Mike,

I appreciate the kind words. I am sorry I put you on the spot.

Jim

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