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New Saito 4 Cycle Gas Engine, 3 Cyl FG-84

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Old 01-25-2013, 09:33 AM
  #126
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Default RE: New Saito 4 Cycle Gas Engine, 3 Cyl FG-84

THe loser will be the SisT. The 450 wont fit in the cowl. I tried
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Old 01-25-2013, 09:43 AM
  #127
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Default RE: New Saito 4 Cycle Gas Engine, 3 Cyl FG-84

Thanks BobH, then I know and do not need to use my time trying that.

I think the Fg 57 is quite a good choice anyway :-)

Just some small surgery on the TF then.
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Old 01-26-2013, 10:47 AM
  #128
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Default RE: New Saito 4 Cycle Gas Engine, 3 Cyl FG-84


Quote:
ORIGINAL: w8ye


Quote:
ORIGINAL: SrTelemaster150


Quote:
ORIGINAL: Kinner

My Saito 450 3cyl is of the dual plug variety. Maybe I could get a 2 fer deal. I'd not really like to plug the glow plug holes since I paid dearly for three extra glow plugs.

Old Fart, I'd hope you got those fires under contol.

Ray W
All 450R3s have dual plugs.

Plug the extra holes & sell the glow plugs.
Easier said than done. - Use old burned out glow plugs in the holes.

I'm to the point that I'm taking perfectly good glow plugs & running a drill bit into the coil! Damned duel plug engines!

I do not have a single engine running on glow igntion. I have a NIB FA200Ti that will never see a glow starter. (I don't think my 300t has either)
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Old 02-07-2013, 09:14 AM
  #129
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Default RE: New Saito 4 Cycle Gas Engine, 3 Cyl FG-84



are there any confirmed rpm figures for this engine yet? the reason i ask is the uk importer quotes an output of 5.7hp @ 7000rpm and yet the 23x12 (from the video) @ 6400 is about 6.1hp. so something is not right. I do agree with telemaster in that this engine will not be a huge powerhouse. Also due to short stroke its likely not to have as much torque as longer stroke engines so may have trouble with big props.

while i know its not the same engine my 450 radial outputs about 4.5hp ( @ 7000rpm on menz 22x8 and 5% nitro fuel). this is vs an advertised output of 5.5hp @ 8000rpm (on, i assume 15% nitro). given this i would suggest that the new engine will give 5.7hp@ 7000rpm and about 5.5hp as a max useful power output as revving its bits off will kill it i am sure. if you calculate it all out it seems that a 24x10 prop @ 6200/6300rpm is where the engine will be. it should be noted that the uk importer recommends the 24x10 and gives the fuel consumption figures for a full throttle rpm of 6200. Given this i am reasonably sure the info above is accurate, but I am very interested in finding out if my predictions are on the money.

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Old 02-07-2013, 09:57 AM
  #130
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Default RE: New Saito 4 Cycle Gas Engine, 3 Cyl FG-84

Interesting information.. who's the uk importer so the rest of us can take a look?
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Old 02-07-2013, 11:01 AM
  #131
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Default RE: New Saito 4 Cycle Gas Engine, 3 Cyl FG-84

http://www.macgregor.co.uk/saito/fg84r3.htm<- direct link to the page. They do not quote the hp figure on the site, i phoned them and they got it from the data sheet saito sent them.
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Old 02-07-2013, 03:47 PM
  #132
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Default RE: New Saito 4 Cycle Gas Engine, 3 Cyl FG-84

thank you
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Old 02-08-2013, 05:23 AM
  #133
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Default RE: New Saito 4 Cycle Gas Engine, 3 Cyl FG-84

Look we've all been loyal to saito for years in one way or another.It's long past due to stop frigging around with what glo fourstrokes they have and invest in some serious carbys and a higher comp ratio for gas,i wish they wouild get real and do something like kolm engines are doing.And you might get an engine when you want and pay for one.
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Old 02-08-2013, 06:02 AM
  #134
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Default RE: New Saito 4 Cycle Gas Engine, 3 Cyl FG-84


Quote:
ORIGINAL: Old Fart

Look we've all been loyal to saito for years in one way or another.It's long past due to stop frigging around with what glo fourstrokes they have and invest in some serious carbys and a higher comp ratio for gas,i wish they wouild get real and do something like kolm engines are doing.And you might get an engine when you want and pay for one.
Higher compression W/gas is problematic W/the high CHT of air colled engines. Especially if the engine was not designed for gasoline & the elevated CHT associated W/gas compared to methanol.
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Old 02-08-2013, 02:43 PM
  #135
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Default RE: New Saito 4 Cycle Gas Engine, 3 Cyl FG-84

Saito already have issues with overheating exhaust valves on the FG series. Also the moki radials can crack cylinders and overheat badly if abused. While i understand what you are saying its a massive undertaking. kolm as a small company and can work small, saito cannot do that.
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Old 02-08-2013, 03:02 PM
  #136
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Default RE: New Saito 4 Cycle Gas Engine, 3 Cyl FG-84


Quote:
ORIGINAL: Carosel43

Saito already have issues with overheating exhaust valves on the FG series. Also the moki radials can crack cylinders and overheat badly if abused. While i understand what you are saying its a massive undertaking. kolm as a small company and can work small, saito cannot do that.
exsa fly but if you look at the first pic again you can see the 30cc satio with new better rocker covers to help provided more cool

I was shocked this motor did not have the red covers

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Old 02-08-2013, 05:20 PM
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Default RE: New Saito 4 Cycle Gas Engine, 3 Cyl FG-84

Is thermal shock loading a factor in model aircraft engines? and what do you consider to be tha max temps on the exhaust side for reliable operation??

I'm currently doing the inflow ducting for an fg 57 and pe reivers has an excellent site for reference.
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Old 02-09-2013, 01:29 AM
  #138
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Default RE: New Saito 4 Cycle Gas Engine, 3 Cyl FG-84

thermal shock is for sure an issue with the moki radials. if you push them hard and then cool them rapidly they dont appreciate it at all. they also like a warm up period (like any engine) after starting. as for max egt im not sure. i know that my laserengines run about 125'c on the head but it varies from engine to engine and installation to installation
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Old 07-18-2014, 02:29 AM
  #139
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Just bought one of these awesome engines

Looks realy nice, and hopefully it will perform well.
Seems to hae good compression on all 3 cylinders when just hand cranking it.

Only a little disapointed in the finish of the crank case iteslf, as it is quite pitted. All the other parts on the engine are perfect.
Did not expect this from a quialty manufacturer.

Never mind, it will not have any negative performance issues due to that. Only the re-sale value will go down if that day would ever come.
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Old 04-25-2015, 02:01 AM
  #140
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Have got a fg84 for my polikarpov i16. Searching for some info on the engine I found this thread, but it just some talk about spark ign. on glow engines. thread ruined from post #6

by the way here is mine fg84 on the test stand
https://www.youtube.com/watch?v=xHr6L00OmKw
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Old 04-25-2015, 11:33 AM
  #141
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Looks good...mine is just about ready to fire up....just need to make my cowl baffle
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Old 04-25-2015, 01:50 PM
  #142
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Looking forward to your performance report
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Old 04-26-2015, 02:39 AM
  #143
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Hopre my baffles work.
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Old 04-26-2015, 06:24 AM
  #144
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here is a little video of the saito engine in a starduster the plane is 12.9kg (28.4p)
https://www.youtube.com/watch?v=yzScrq5kjlk
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Old 04-26-2015, 06:32 AM
  #145
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Thanks for the video. Seems to have good power :-)
Im eager to see how it hauls my 15,5kg heavy yak around. 245cm span.
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Old 04-26-2015, 10:51 PM
  #146
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Quote:
Originally Posted by n8622t View Post
I think it's time for an engine clinic for you two ....somewhere else lol

I THINK SO TOO,
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Old 04-27-2015, 07:22 AM
  #147
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Wow, this engine sounds awesome :-)
Video does not even captue the awesome deep sound properly.

First engine start just to make sure it all works before going to the field for break in.
Only firing on one cylinder in the first part of the video. I then opened up the low speed neeldle 3/4 of a turn, and then all 3 cylinderrs where fireing in the last bit of the video.

https://youtu.be/B0Vratxl14o https://www.youtube.com/watch?v=B0Vratxl14o&feature=youtu.be

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Old 07-12-2015, 09:32 AM
  #148
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3rd flight on my Yak :-)
Still setting up the plane and changing CG...its still a bit pitch sensitive.

Stock engine runs great so far.....7 liters through it now.

https://www.youtube.com/watch?v=jhXmktYohnM
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