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Saito 100 turns 7500 Max

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Old 03-16-2017, 02:11 PM
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tailskid
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Question Saito 100 turns 7500 Max

Brought out an old Saito 100 and had it cleaned up and now it only go go to 7500 RPM w/ 14-8 MAS....drags a H9 Funtana 90 around just above stall speed Suggestions? Using some 20% Pattern/Heli fuel.

Jerry
Old 03-16-2017, 05:10 PM
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High speed needle peaked?
Old 03-16-2017, 10:05 PM
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Yep, the rpm's drop off as I lean it out to about 7500.....transition is good, idle about 1900-2050.

jerry
Old 03-17-2017, 04:06 AM
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7,500 would be with the throttle about 50% open, so I don't know what the problem is or could be.
Old 03-17-2017, 04:43 AM
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I wish I could give it a physical.
Old 03-17-2017, 05:44 AM
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check the valve springs and lash
Old 03-17-2017, 06:51 AM
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Hi!
First of all the MA prop is worthless ! Use an APC, RAM or Graupner G-Sonic instead!
Second. You said you have cleaned it. Do you mean changing bearings ?
Old 03-17-2017, 01:23 PM
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tailskid
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Bearings were good and not replaced.....maybe the cam gear is one tooth off?

I will check it again....thanks for the suggestions....

jerry
Old 03-17-2017, 02:01 PM
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Skid, there is an easy way to check without pulling the cam cover off. Place the piston at tdc on the end of the exhaust stroke and the beginning of the intake stroke. Both valves should be open an equal amount and should alternately open and close a little when rocking the crankshaft back and forth at tdc
Old 03-17-2017, 05:25 PM
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My buddy found the exhaust valve was out of tolerance! We will test it tomorrow.....and the cam was correctly installed.
Old 03-18-2017, 07:09 PM
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A) I agree, for sure check your Tappet Lash, it's a must,

B) make sure you are using a quality Glow Plug, I wouldn't take a brand new TT 4St Plug for free !!

C) know that for the most part that most wood props do load an engine more than plastic props,, example> if you are turning 8000 with an APC 14x8 you would need a quality wood prop around 14x5 or 14x6 to turn that same, or close to that 8000,

but then again there is the Cam Timing, I have read about Saito's Cam Timings being off

Jim

Last edited by the Wasp; 03-18-2017 at 07:15 PM. Reason: I'm addicted to the edit button, it makes feel all warm and cozy inside, but then I need to do it again
Old 03-18-2017, 10:24 PM
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tailskid
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It might be fixed! Got a solid 8500 with that same MAS ...... Got to try some other props on Monday.

Update to follow
Old 03-19-2017, 03:39 AM
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TS, as you put additional time on it, it may wake up some more as the new fuel cleans it out. Was the exhaust valve lash too small or excessive? Too loose will seldom effect the rpm much. Thanks, Dave
Old 03-20-2017, 03:17 PM
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Found the problem. ... .. When the valves were set, we were 180 degrees OFF! It wasn't on the TDC of the Compression stroke. She pulled the Showtime around like the old days!

Thank all you guys who helped!!!

jerry

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