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Engines and Mufflers Having problems or need advice on Engines or Mufflers?


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Old 04-07-2021, 04:48 PM   #1 (permalink)
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Default OS 55-HZR Temps

For those of you that monitor your motor temps, what range does your 55 like? Itís only part of my tuning adjustments. I also listen and watch but Iím just now jumping back in after about 10 years away.

Thanks in advance.

Last edited by jakeg1999; 04-08-2021 at 04:39 AM..
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Old 04-08-2021, 05:07 PM   #2 (permalink)
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Quote:
For those of you that monitor your motor temps, what range does your 55 like?
There is no standard place on the motor for measuring its running temperature. So, asking "what's typical" is kind of a waste because it depends on where it is being measured.
Personally, I place the sensor next to the glowplug and glue it down with Arctic Silver 2-part Thermal epoxy.
But, the reality is that it is only a reference and should not be part of the tuning process.
You tune for power, sound and smoke. Then, assuming you haven't run the engine lean, note the temp using the sensor mounted where you like. That way, if you start seeing the temp rise above the expected peak, you know something has changed in the engine and its time to take a closer look.
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Old 04-09-2021, 05:03 PM   #3 (permalink)
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I agree and maybe I should have noted to list the location of where you’re checking your temp. I am aware of the other signs to look for, I was just curious what other temps folks are finding that this particular motor likes.

Checking temps is something I do just about every flight, mostly with my telemetry but also with a handheld. It’s a good way for me to monitor what’s going on with the motor. A sudden air leak such as a forgotten plug or lose bolt in my experience doesn’t show it self as quickly via sound as it does via a telemetry alarm. (Had this happen)

I’m not looking to start a how to tune thread or a this is better than that thread, just curious for those other folks who also enjoy monitoring their temps as part of the hobby, what their OS 55’s happy temp range is.
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Old 04-15-2021, 09:35 AM   #4 (permalink)
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Default OS 55 Temps

Agreed smoke and sound are important. Here is feedback from OS.

OS55hz Temp rangeÖ

Synergy N566 Helifreak forum.

07-11-2018, 10:16 PM
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thebirdman
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Ok spoke with OS direct today and they were more than happy to educate me
Ideal cylinder head temperature's are in the 230-240F range for the OS55hz and HZR
Temperatures above 250F will ensure short engine life.

So now I can stop freeking out about the alarm going off at 210F lol
And start tunning/tweeking for some more fuel economy
Birdman

Brute71
The motor definitely wakes up in the 230~250įF range for me measured at the base of the cylinder head. More than enough power for me with the hatori pipe.
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Old 04-15-2021, 12:23 PM   #5 (permalink)
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Great info! Thanks for sharing. I’m just under 200f and I can tell it’s still rich but plenty of power for my needs. Good too know I have some headroom!
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Old 04-21-2021, 01:24 AM   #6 (permalink)
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I'm just below 240F with great power. I don't want to squeeze more power out of the motor as it will definitely start to go lean.
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