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Saito's New Engine: FG-90R3

Old 12-30-2021, 09:12 PM
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I didn't change the voltage, that is what it went down to after 6 hours of use.

I had this engine modified, part of the mods was the timing which should be 30 degrees BTDC. Stock from Saito they are arounf 40 or 45 degrees which is very advanced and aggressive, might give you a bit more on the top end but makes it a very lumpy and poor performing at lower RPM.

Upon checking mine #1 was 40, #2 30, and #3 was 33.
I'll fit the MMM timing hub which will have all at 30 degrees BTDC.
Have to get a new hub locating pin as I snapped it pulling the hub, was not out enough. New one plus original hub washer and nut on the way from MMM.


Happy New Year to all. Stay safe.



Old 12-31-2021, 04:43 AM
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Question to those which disassembled this engine:
Is it possible to remove back plate without damaging the gasket?
I like to inspect crankcase but without having spare gasket I'm affraid to touch anything.
Old 12-31-2021, 10:10 AM
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Originally Posted by planenutzz
Ran the engine again yesterday and it had a bad miss till it got over 4500RPM. I re-did the tappets, valves for you septics, cleaned the oil from plugs, they are new.

Tried tuning it out without success then about 8pm I checked the voltage on the 2S LiION ignition battery, 5.6V, it had about 6 hours of use on that charge. I suspect that is the problem.

Will be checking the timing later today to ensure it is set at 30 degrees. If not I will fit the MMM timing hub and adjust to 30.
Just a thought. Could be a small obstruction or dirt in the carb that impacts the low needle setting? I would try removing the needles and fuel line and give it a blast of solvent through the needle holes and fuel inlet.
Old 12-31-2021, 10:16 AM
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Originally Posted by darod07
Question to those which disassembled this engine:
Is it possible to remove back plate without damaging the gasket?
I like to inspect crankcase but without having spare gasket I'm affraid to touch anything.
Yes it is, as long as you take your time removing all components to get to the back plate, then remove the back plate slowly too.

Old 01-02-2022, 07:43 AM
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Today I made an inspection of the crankcase after 1st full season with few dozen of flights and I'm satisfied with findings. All is well greased and looks ok. Lubricating nipple fitted by Saito is in right place. Oil drops exactly where it should, on to the crankshaft with master rod and linked conrods.
All 3 spark plugs are the same colour with black stain, what tells me that engine is running slightly rich. I'm satisfied with performance so I'm not going to lean mixture.





Old 01-07-2022, 01:49 PM
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Originally Posted by darod07
Question to those which disassembled this engine:
Is it possible to remove back plate without damaging the gasket?
I like to inspect crankcase but without having spare gasket I'm affraid to touch anything.
I removed mine easily, just be careful. If it sticks get a fine razor blade and see if you can gently coax it up. Mine came off with no issues at all.
Old 01-07-2022, 01:52 PM
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Darod, looks nice and clean in there. What oil & % mix are you using?

I'm still waiting on the hub parts to arrive before fitting the MMM timing ring, setting timing and running it again.

cheers
me
Old 01-07-2022, 01:59 PM
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darod, thanks for the pics on the location of the upper lube exit point. When I tear mine down for inspections, I will add the lube point and nipples to both of my fg90r3 engines .
Old 01-07-2022, 04:27 PM
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Originally Posted by planenutzz
Darod, looks nice and clean in there. What oil & % mix are you using?
It's Klotz 200 with 1:15~17 ratio.
Old 01-08-2022, 02:46 PM
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Originally Posted by darod07
It's Klotz 200 with 1:15~17 ratio.
same as I am using.
Old 01-08-2022, 05:06 PM
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Originally Posted by darod07
It's Klotz 200 with 1:15~17 ratio.
Same here on the Klotz. Everything looks great. Little rich is not bad. What kind of RPMs and temps are you getting?

jim
Old 01-09-2022, 02:45 AM
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Originally Posted by jimkron
Same here on the Klotz. Everything looks great. Little rich is not bad. What kind of RPMs and temps are you getting?

jim
Here is a graph from one of the recent flights onboard telemetry. Temps are in Celsius:


Old 01-09-2022, 02:37 PM
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Those temps don't look a lot different to what I am getting on the test stand with no baffles. I think the worst I have seen was 136C @ max RPM of 6250.
Old 01-10-2022, 03:39 PM
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Those temps and rpm look fine to me. Temps could be a little cooler. But a lot depends on the air temp that day. If it was 90F air temp, those are good numbers. If it was 50F...I might worry about hotter days.
I like RPMs around 6500 in the air. Temps on warm day around 225F. This is not a cheap motor. Be nice to it.
Also, Depending on the plane, open up those cowl flaps...and use baffles.
Good job.

jim
Old 01-10-2022, 04:38 PM
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Originally Posted by jimkron
Those temps and rpm look fine to me. Temps could be a little cooler. But a lot depends on the air temp that day. If it was 90F air temp, those are good numbers. If it was 50F...I might worry about hotter days.
I like RPMs around 6500 in the air. Temps on warm day around 225F. This is not a cheap motor. Be nice to it.
Also, Depending on the plane, open up those cowl flaps...and use baffles.
Good job.

jim
I'll add that when I have been ground running mine on the test stand the days have been about 32 - 35C as it is our summer here. Will be creating an opening in the bottom where the exhaust outlet comes out to get a bit more hot air out.
Old 01-26-2022, 09:14 AM
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if i want to place a temp sensor wire around one of the cylinders which one is best to check and where on the cyl should the wire be placed.. i have spektrum telem rx for reading in flight.

also does the newest 90 need a hub ring swapped to correct timing or has saito addressed the issue and fixed it on this motor stock
Old 01-26-2022, 01:45 PM
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Originally Posted by horsefeetky
if i want to place a temp sensor wire around one of the cylinders which one is best to check and where on the cyl should the wire be placed.. i have spektrum telem rx for reading in flight.

also does the newest 90 need a hub ring swapped to correct timing or has saito addressed the issue and fixed it on this motor stock
Saito have not addressed the timing issue. They come set at 45 degrees. I'd suggest getting the timing ring, inudction back plate as well from Morris Mini Motors. He also have the Rxcel timing bits you will need and has a Youtube channel where he explains how to set the timing.
Old 01-26-2022, 11:32 PM
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Originally Posted by horsefeetky
if i want to place a temp sensor wire around one of the cylinders which one is best to check and where on the cyl should the wire be placed.. i have spektrum telem rx for reading in flight.

also does the newest 90 need a hub ring swapped to correct timing or has saito addressed the issue and fixed it on this motor stock
Top cylinder is best to measure as it will get hottest on any radial engine. I place the sensor on the cylinder as high as possible without touching the exhaust port.
Old 01-27-2022, 01:33 PM
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Originally Posted by ClausBN
Top cylinder is best to measure as it will get hottest on any radial engine. I place the sensor on the cylinder as high as possible without touching the exhaust port.
I'm using Cockpit V2 telemetry system as I have an older JR 12X radio with no telemetry. One of the modules has RPM and 3 x temperature thermocouple probes so I can measure each cylinder.

#1 is in fact quite good on mine, it is mainly #2 that gets hotter. I expect that will settle down once the engine has more time on it. So far it has have about 6 hours of ground running, this will suffice till it goes in the model.

What is with the new layout of the RCU website? I really do not like it one bit.
Old 02-02-2022, 07:22 PM
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Just wondering if this engine was selling at $1499 last year. I had a note on my desk for that price, but now it's $1699. Let me know if I'm correct in this price change. BTW, does Saito ever have sales on their engines? Thanks
Old 02-03-2022, 02:23 AM
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Originally Posted by hkusp45
Just wondering if this engine was selling at $1499 last year. I had a note on my desk for that price, but now it's $1699. Let me know if I'm correct in this price change. BTW, does Saito ever have sales on their engines? Thanks
Hi
Here in Germany, the prices have also risen from 1520 to 1750, the motor now costs.
Old 02-03-2022, 04:24 AM
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Originally Posted by hkusp45
Just wondering if this engine was selling at $1499 last year. I had a note on my desk for that price, but now it's $1699. Let me know if I'm correct in this price change. BTW, does Saito ever have sales on their engines? Thanks
Yep, have you been to the grocery store lately or the gas station? Everything is going up
Old 02-03-2022, 12:34 PM
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so now the prices are high enough and you still need some mods installed after purchase i am going with a ums radial from c and h ignitions.. better support and i can get a 5 cyl for not much more investment. has the ring exhaust also included.
Old 02-03-2022, 04:46 PM
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most of it is the cost of transportation.
While the transport of a standard 40-foot container from Shanghai to Rotterdam in January 2020 still cost around 2,000 US dollars, freight rates are now (13.01.2022) at over 14,000 dollars (World Container Index).
And the end user pays for that
Old 02-05-2022, 07:44 AM
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xicoy and others have gone to air pkg individual or small multi packs inside a box for shipping engines. no container needed and they take too long to get here and in our hands that way. it ads 60.00 to each turbine xicoy sends here. long way from the price increase saito put on these. big importers only think one way and that is container and large profits. ums still works with dealers to keep things coming in steady and at only an increase as needed to cover upcharges.

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