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Saito's New Engine: FG-90R3

Old 02-05-2022, 01:44 PM
  #601  
Jesse Open
 
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Originally Posted by BarracudaHockey View Post
Yep, have you been to the grocery store lately or the gas station? Everything is going up
I see some grocery stores are going to use remote control pricing signs, similar to a small version those used in gas stations.
Some prices are going up three times a day.
Seems inflation is becoming a lot like pre-war Germany. History repeats.
Old 02-07-2022, 06:41 PM
  #602  
Edgar Perez
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Anyone know what is the minimum temperatures when a cylinder is running?
Doing my break-in and always getting a cylinder with much cooler than the other two. I rotate the engine, so it not always the same one (not even always the bottom one)

My measured temperature before starting was 82 degrees Fahrenheit. Temperature varied widely when running very rich from 160 degrees to 230 degrees Fahrenheit. However sometimes one cylinder will be say 120 degrees. Thinking it was still running but wondering if it was just the heat transfer from the other cylinders..

Thanks
Old 03-06-2022, 03:04 PM
  #603  
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Getting ready to install the FG90 on a TRC Zero. Question for those who have the Keleo exhaust ring.
What are you using to seal the threads?
Thinking Teflon tape will be OK or is something like Ultra Copper or Ultra Black a better choice???

Thanks - J Tab
Old 03-09-2022, 06:54 PM
  #604  
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Teflon tape is better than the silicone stuff.
I have been using anaerobic teflon paste called SWAK, which can be hard to find and and the miserly type groan over the price

Better yet, Loctite makes a similar anaerobic teflon paste that is easier to find and comes in smaller, cheaper tubes. I much prefer either over the best of teflon tapes.


Prevents loosening, lubricates and protects threads.

Last edited by Jesse Open; 03-09-2022 at 07:07 PM.
Old 03-12-2022, 11:16 AM
  #605  
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what do you guys use for a plug wrench i cant get any sockets or other wrenches to work....help with a link or picture of something i can buy that will fit. it seems its 14mm
Old 03-12-2022, 12:02 PM
  #606  
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The CM-6 plug is 14mm or 9/16" sae . I use the sparkplug tool that came with the engine .
Old 06-14-2022, 07:13 AM
  #607  
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Iím starting to fly my Boeing F4B with a Saito FG-90 radial. I wanted to fly yesterday but I could only get 4700 rpm with a 24x12 prop. Iím going to check valve lash first. Any other reason for this?
I've also noticed that the ignition is using about 900 mAh per flight from a dedicated ignition battery. Seems like a lot. I didnít even fly yesterday and I put 2000 mAh in the pack when charging this morning. Luckily, my ignition battery is a 6800 mAh LiThium Ion. Anyone else seeing this?
Old 06-14-2022, 07:35 AM
  #608  
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I'm flying 7 minutes and using maybe 350mah total (including the HV flight servos and a tech aero IBEC powering the ignition) on my H9 Corsair.
Old 06-14-2022, 03:22 PM
  #609  
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I've got one on the front of a Gilmore Red Lion. Uses about 300-400 mah per flight. I'm always amazed at how little fuel it burns in an 8 minute flight!
Old 06-14-2022, 11:46 PM
  #610  
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Originally Posted by RCdude13 View Post
Iím starting to fly my Boeing F4B with a Saito FG-90 radial. I wanted to fly yesterday but I could only get 4700 rpm with a 24x12 prop. Iím going to check valve lash first. Any other reason for this?
I've also noticed that the ignition is using about 900 mAh per flight from a dedicated ignition battery. Seems like a lot. I didnít even fly yesterday and I put 2000 mAh in the pack when charging this morning. Luckily, my ignition battery is a 6800 mAh LiThium Ion. Anyone else seeing this?
Check the spark plugs and set the gap as per the manual. Next I would lean it out on the the needle to see if its too rich
Old 07-09-2022, 08:40 AM
  #611  
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Just to report what a difference a change in props makes on my 33# TRC Zero. I was using the Biela Corsair style 23 x 10 x 3. Performance was not so good, and the temps climbed above 250F when going to full throttle. Switched to a Xoar 24 x 12 x 2. Temps stay under 235F and the performance difference is remarkable. One other prop I would like to try is a Biela 22 x 12 x 3, but I don't believe any scale 3 blade is going to outperform a 2 blade prop.

Regards - J Tab
Old 07-09-2022, 12:08 PM
  #612  
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Xoar 23x10x3 WW II prop performs pretty nicely on my H9 Corsair
Old 08-21-2022, 09:48 AM
  #613  
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The Saito FG90R3 ignition appears to have going kaput suddenly. After several hours of excellent fly time, the ignition appears to have gone bad.
Warming up for a flight and the engine quit for no explanation. Voltage good and nothing else on engine out of ordinary.
Questions: Anyone else experience a bad ignition module? Is there any test for the ignition I can perform before contacting Horizon?

Hoping that Horizon will except only the return of the module for warranty without sending in the 6-month-old engine.

Thanks - J Tab

BTW - the FG90R3 is the easiest starting and best running engine in my fleet. No complaints up to now.

Old 08-21-2022, 12:50 PM
  #614  
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Jaketab, at first I thought it was the ignition too but I was getting spark at the plugs. I found that mine was not drawing fuel so the carburetor just gave up pumping fuel. I replaced the carburetor and that solved the problem. The FG 90 is back to running like a well oiled Swiss watch.
Old 08-21-2022, 12:56 PM
  #615  
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First check whether the Hall element is not the issue. Extremely rare but known to happen, or possibly a wire breakage.
Old 08-21-2022, 02:57 PM
  #616  
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Originally Posted by 1967brutus View Post
First check whether the Hall element is not the issue. Extremely rare but known to happen, or possibly a wire breakage.
It could be the hall sensor, but it looks good by visual exam. The carb is pumping and working fine. Very wet.
I removed the plugs from cylinders and inserted the plugs back into the caps. Ignition module connected directly to charged 7.4 v Li Ion. Rotation of prop reveals no spark being sent to or produced by the spark plugs.
Old 08-21-2022, 03:47 PM
  #617  
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Perhaps the passing distance between sensor and magnet has changed? Are the magnets still "magnetic"? If you have had a hot run, and the shaft got over 170F, there is a possibility the magnetism is gone.,
Old 08-30-2022, 12:53 PM
  #618  
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Installed the new warranty replacement ignition today. That confirmed 100% that the ignition was the problem.
The original ignition decided to quit without advance warning symptoms. Back to flying now.

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