tfarmer96

what are you guys using for a choke on this motor. I have hell getting her started some times.


Thanks

jagdpanther9

hi farmer, i have this engine in my TF giant corsair arf and am just loving it. i use the standard long threaded tool that is supplied with the engine and for me is a real trick to lite this engine up by flip starting it. when i choke the engine i have throttle closed not set @ idle but closed with the throttle cut off switch. i pull out on the choke tool and slowly turn the prop through 6-7 times of felt compression not 6-7 revolutions . then i open throttle to 1/2 and with just a few flips she will come to life @ about 3500rpm so be ready and make sure the model is held and anchored well !. even if i do this perfectly it dosn't always work that well when the engine is warm and i have tried not choking it at all after it has been started and still no start. so i bought a electric starter off ebay from china for 70 bucks ,run it on a 2200 3s lipo and she pops off much easier than flip,flip,flip,flip.
this is the starter that i bought .TOC Roto Terminator Starter for 20-80cc Engine, rc airplane D52*H30mm . i am really surprised the power/torque that this thing has on a 3s battery.

tfarmer96

Ok so at least I'm not alone with this....

luckymacy

first start of the day I use a hand held electric 3S electric starter. Takes a full second or two at a high idle setting and it starts. Rest of the I can hand flip if I want and it will start in a couple of flips.

tfarmer96

I have a second 90 so I have it all broke in with 2.5 gallons put through it on the ground at 3k with the adjustments out as fare as they would go just like it did for the one I am flying in my FW190. But now I am about the experiment. I got a walbro carb from mini motors in the uk. yesterday I ran it on the ground and it did fine. I only got 5600 out of it on the ground with a 24x10 prop and that was where it wasn't over lean it don't mind motors a little rich. I'm not done with this experiment yet.

SJN

My carb is inside the fuselage, so I squirt gas into the carb for every start.......the stock choke system is terrible :-(

tfarmer96

the hope is this carb with a real choke will fix some of the startup issues. we will see

deadstick79

I hve the mini motor carb on mu fg 60r3 and it is still on the test stand. to start i just open the throttlle squirt some fuel in the carb. then i grab the prop and turn her thru, feel the little "bump" and she'll fire off in just one or two flips.... almost everytime

Chris Nicastro

My Feedback: (3)

From a storage or dry carb condition I use the starter and turn the 84 for 3-5 seconds with the ignition off to prime it. Then I turn on the ignition and use the starter and it fires up at idle speed very quickly. I've not had to use the stock choke this way. Then once the engine has been flown during that day it will flip start almost immediately for me.

I lije the Walbro carb mod idea too but so far it's running fine. I'm getting over 7000rpm in flight on a Xoar 24x14 wood prop currently so I'm going to switch to 24x10 x 3 blade to slow it down a bit.

This 84 is in a TF Corsair by the way, just though I'd mention how easy it is to start.

chandley43231

My Feedback: (2)

jagdpanther im getting this for my top flite corsiar thanks for your help

chandley43231

My Feedback: (2)

how much of the fire wall do you have to cut to get the motor into the topflite corsair??

koenvlieg

Did somebody try the 90/84 with keleo ring and smoke system

kevarc

My Feedback: (2)

I have engine in the Hanger 9 Corsair. After my initial problem with it it now seems to run fine.
I have telemetry on it and it is turning about 6,000 rpms with a 24/10 prop.
I do have keleo ring but no smoke and am using the exhaust pressure.
I have about 2 gallons through it, and it starts right up using a starter after 10 flips or so choked.
On my second flight the engine ran good but every so often it would miss. Here is a video where you can hear it.
I had the idle a bit to low and it died on my landing approach. Hit hard enough to jam the gear through the top of the wing,
Got that repaired and on the third flight the engine preformed good but still had that miss from time to time.
Also noted that on a steep climb out the engine missed enough I did not do that again.
I need to figure out how to hold it nose up on the ground, Yikes.
Few questions.
What might be the cause of the misses?
Are you using the exhaust pressure?
My throttle response is all in the bottom half of the curve, hardly any rpm increase from half to full?
What kind of temps should it be running at?
Thanks in advance!
Kevin

n8622t

My Feedback: (8)

What battery are you running? Seems like that ignition requires 7.2?

kevarc

My Feedback: (2)

I am using a 6.6 volt life battery from Electrodynamics. The manual indicates 6 to 12 volts so figured it would be OK.
I have no idea how the ignition module works. Does it regulate the voltage down to a certain voltage or pass through what ever is coming in.
I can change to a Lipo easy enough.

n8622t

My Feedback: (8)

sounds like you have good voltage and electrodynamics makes good stuff....you could send the ignition in to HH and they could test it for you, but before you do that you might try changing all the plugs. Also. Is the switch easy to change? That would eliminate everything but the ignition

n8622t

My Feedback: (8)

Is the pulse tube securely hooked to the carb? Man that hurts watching that video, that's a nice plane

BobH

My Feedback: (2)

Try changing spark plugs and make sure the plug wires are tight on the plugs. If it keeps missing either the ignition is bad or there's bad wiring some where.

koenvlieg

if you use an electronic spark switch, it can be the reason. Easy to test : connect the battery direct to the ignition and see what happens

n8622t

My Feedback: (8)

good idea....take some fresh plugs with you so you can try those after

ClausBN

Listening to your video it sounds like the misfires in flight are do to too rich mix.

Chris Nicastro

My Feedback: (3)

Just run it and tune it as you get to know the engine. The stock 84 also did the same thing as you described with the stumble or miss and it concerned me too. I flew two different Corsairs with 84's and Keleo rings and both concerned me for the same reason. We sent one to be modified, the intake manifold is this engines weakness. After the mods telemetry reads 7400rpm in flight with a 24x14 Xoar prop. It pulls the TF Corsair around like nothing's there and runs clean and consistent.
The newer engine is supposed to be a development of the Ray English mod for the 84. You should be able to tune that stumble out. Use Klotz oil and Non-Ethanol 92 gas. Watch those peak rpm's too. Temps should be even between all cylinders and watch that they are under 200F. Mine runs around 175F on a typical day.

jagdpanther9

how did the 24x10 3 blade work out ? mine is just screaming with the 24x12 and i sure do not want to grenade this FG90.

Chris Nicastro

My Feedback: (3)

I still need to get the Solo hub for my blades. I have 4 matching scale 24 inch blades I plan to use. I'll set the pitch to a max RPM at full power to keep it inside the safe range.
I don't recommend a thin prop blade on these engines. From past experience the thin blade props like Mejzlik allow the engine to over rev. I use Xoar most of the time but there isn't a prop for this requirement.

jimkron

Hey Chris and other Saito masters,
Trying to tune a FG 84. Starting with 3 turns on the High and 5 turns on the Low. Low end needle is responsive but getting no response with the main needle. Tried turning in a full turn...and out a full turn...no response. Tach is reading 5600.
Any ideas why the main is not responsive?

Thanks,

jim