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Old 03-10-2019, 10:26 AM
  #39301  
Hobbsy
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OK Pap, they have different part numbers Sait50 and Sai56, the engine code for the 50 GK is F, here is that page: https://www.horizonhobby.com/SearchD...ain=&pageView=

The code for the 50 plain is E

My 50 GK has the Sai56 valves in, mine is a later 50 model. If you haven't used those engine codes just type in Saito F in the Horizon search bar.
Old 03-10-2019, 11:19 AM
  #39302  
Papa51
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So if I buy thr FA-56 valves they will have the relief cut under the valve heads and they will work in my FA-50?
Old 03-10-2019, 11:23 AM
  #39303  
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I believe so, they have the F designation, I just ordered a set.
Old 03-10-2019, 12:25 PM
  #39304  
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Well got to run the 150 with 120 crank.
Turning a 16X8 at 8000. So is that good or bad.

Old 03-10-2019, 12:35 PM
  #39305  
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The 120s is rated at 2.2hp, the 150 at 2.5hp. On my static thrust calc it shows an APC 16x8 @8000 to be 1.933hp. I'm amazed it runs that good! How is the idle and transition?
Old 03-10-2019, 12:50 PM
  #39306  
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Originally Posted by Glowgeek
The 120s is rated at 2.2hp, the 150 at 2.5hp. On my static thrust calc it shows an APC 16x8 @8000 to be 1.933hp. I'm amazed it runs that good! How is the idle and transition?
it idles vary well and transition excellent
Can’t play with the low speed we found that they run different up north then down south. Don’t know if it’s the cold humidity or the hot and dry.
Old 03-10-2019, 01:26 PM
  #39307  
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So i just built a Saito 135.
Hmmmmm
Old 03-10-2019, 04:20 PM
  #39308  
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So, what you have is a 34 mm bore and a 24.8 mm stroke

The 270 twin has the same 32 mm bore as the 120 but a 28 mm stroke, interesting numbers.
Old 03-10-2019, 04:27 PM
  #39309  
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Originally Posted by Hobbsy
So, what you have is a 34 mm bore and a 24.8 mm stroke

The 270 twin has the same 32 mm bore as the 120 but a 28 mm stroke, interesting numbers.
compared to the numbers from your 150 how do they stack up
Old 03-10-2019, 04:36 PM
  #39310  
the Wasp
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Under Cut Valves

guys, yes-yes a Saito may not be a Chevy SB, but the increase in the Fuel/Air Mix flow with Under Cut Valves in a Saito should be a percentage of the same result in a Chevy SB. otherwise Saito would not be using Under Cut Valves, I have read more than once that Under Cut Chevy 2.02 valves flow 40 percent more fuel/air mix than a Non Under Cut 2.02 valve

Jim
Old 03-10-2019, 04:39 PM
  #39311  
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The 150 is 34 mm x 27.6, if memory serves my High Compression 150 turns a 16 x 8 ? brand at 9,250.
Old 03-10-2019, 05:44 PM
  #39312  
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Originally Posted by Hobbsy
The 150 is 34 mm x 27.6, if memory serves my High Compression 150 turns a 16 x 8 ? brand at 9,250.
so the 135 is off a bit.
I wounder if the ch ignition will help a little
Old 03-10-2019, 06:27 PM
  #39313  
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Originally Posted by Captcrunch44


so the 135 is off a bit.
I wounder if the ch ignition will help a little
There are some things you can try Crunchy. Understroked like it is the compression ratio is less, and the squish zone is widened. Both of those things will retard the fuel ignition timing in a glow engine. In order to advance the timing you can try a hotter glow plug and increase the nitro content in an attemp to get the rpm up to 9000 with a 16x8. If those don't get you there perhaps an elect ignition would.
Old 03-10-2019, 07:08 PM
  #39314  
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Originally Posted by Glowgeek
There are some things you can try Crunchy. Understroked like it is the compression ratio is less, and the squish zone is widened. Both of those things will retard the fuel ignition timing in a glow engine. In order to advance the timing you can try a hotter glow plug and increase the nitro content in an attemp to get the rpm up to 9000 with a 16x8. If those don't get you there perhaps an elect ignition would.
well as far as nitro I’m running 30%
but Ch ignition should be here this week.
Old 03-11-2019, 12:39 AM
  #39315  
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Originally Posted by Captcrunch44
Well got to run the 150 with 120 crank.
Turning a 16X8 at 8000. So is that good or bad.

Capt why the rubber gloves when holding the tacho,is it somehow toxic,just kidding,but how come it only reads to 10,000rpm,did you used to own a saito fa125? on a serious note if it helps you to scale what your 16x8 unknown as you did'nt say prop should pull on the fa150 re max rpm...my fa115 will pull a steady 9000 on 10% swinging a mas classic 15x8.Someone here mentioned the mas scimitar q tip props and i like their 14x10 flying the fa115 as well.

Dave i looked at the horizon site re the fa56 parts new.YOU guys pay next to nothing for new parts over there.I could have bought all those parts and put it together over there for the same price as i'd pay here for a new boxed engine with a valve lash adjuster as thick as my house front door mat.I spun my small cap 232 in at low level and bent the crank on an fa82,cost me no change out of a c note.
Old 03-11-2019, 02:07 AM
  #39316  
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Delete

Last edited by Jesse Open; 03-11-2019 at 03:06 AM.
Old 03-11-2019, 04:04 AM
  #39317  
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Originally Posted by Rudolph Hart
Capt why the rubber gloves when holding the tacho,is it somehow toxic,just kidding,but how come it only reads to 10,000rpm,did you used to own a saito fa125? on a serious note if it helps you to scale what your 16x8 unknown as you did'nt say prop should pull on the fa150 re max rpm...my fa115 will pull a steady 9000 on 10% swinging a mas classic 15x8.Someone here mentioned the mas scimitar q tip props and i like their 14x10 flying the fa115 as well.

Dave i looked at the horizon site re the fa56 parts new.YOU guys pay next to nothing for new parts over there.I could have bought all those parts and put it together over there for the same price as i'd pay here for a new boxed engine with a valve lash adjuster as thick as my house front door mat.I spun my small cap 232 in at low level and bent the crank on an fa82,cost me no change out of a c note.
I started using the OS Feeler Gauge .04 mm, I think. I have one of those old ACE tach's I bought in 1990 or so, my old Saito 80 has spent most of it's life wearing a Scinitar 13 x 6. I had a Cap 230, powered by the Saito 150, for several years, it had a habit of dropping the left wing when it went into ground effect. I flew next to a guy down in south western Va. who had an identical one with a Saito 180 it too would drop the left wing in ground effect. It demanded all your attention. My Cermark Cap with a Webra P-5 91 did not not do that.

Last edited by Hobbsy; 03-11-2019 at 04:10 AM. Reason: Add content
Old 03-11-2019, 05:45 AM
  #39318  
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Well the tac was for you older gentleman, thought a nostalgia moment. The gloves well it’s only 28 degrees up here and i was on call for the ambulance service and didn’t want to get glow fuel all over and they protect the hands from the 100 mph wind that would freeze my delicate hands. HaHa.
I don’t like how the 135 turns the 16-8 ao i will order the 150 crank and get the RPM’s back up to speed.
Old 03-11-2019, 05:50 AM
  #39319  
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We'll certainly look forward to that. I use so many three blade props that I have to have a tach with choices.

Last edited by Hobbsy; 03-11-2019 at 05:52 AM.
Old 03-11-2019, 05:57 AM
  #39320  
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Originally Posted by Hobbsy
We'll certainly look forward to that. I use so many three blade props that I have to have a tach with choices.
yeah I need to get a new digital tac one of the number’s is missing part of it. the ace tac is like new and works pretty good. It doesn’t jump around like the digital tac’s do.
Old 03-11-2019, 06:01 AM
  #39321  
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Hobbsy got a minute? Can i pm you
Old 03-11-2019, 07:16 AM
  #39322  
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What I want to know Crunch, is how you took a picture with both hands holding the tach?
Old 03-11-2019, 07:29 AM
  #39323  
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Originally Posted by acdii
What I want to know Crunch, is how you took a picture with both hands holding the tach?
Well he always has been a little odd that should be a clue.
Old 03-11-2019, 08:01 AM
  #39324  
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Originally Posted by acdii
What I want to know Crunch, is how you took a picture with both hands holding the tach?
well there is Captcrunch JR. She is a lot of help.
Old 03-11-2019, 08:03 AM
  #39325  
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Originally Posted by FlyerInOKC
Well he always has been a little odd that should be a clue.
Thought you guys would like the nostalgic tac. I kinda like it.


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