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kj7sr(at)earthlink.net
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 Posted: Sun Oct 19, 2008 11:25 am Post subject: EGT's & Oil Temp |
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A question for those with 80hp Rotax 912's. What do you consider a normal EGT and Oil temp when at cruise at about 5500rpm?
Thanks
Chuck
Kitfox Model IV
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Sbennett3(at)aol.com
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| Posted: Sun Oct 19, 2008 11:39 am Post subject: EGT's & Oil Temp |
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EGT 1300 to 1400. Oil temp should be 190 or above. I put tape over half my oil cooler to get the temp up. Steve Bennett
In a message dated 10/19/2008 3:26:47 P.M. Eastern Daylight Time, kj7sr(at)earthlink.net writes:
| Quote: | A question for those with 80hp Rotax 912's. What do you consider a normal EGT and Oil temp when at cruise at about 5500rpm?
Thanks
Chuck
Kitfox Model IV
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wingnut
Joined: 11 Jan 2006
Posts: 356
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| Posted: Mon Oct 20, 2008 11:22 am Post subject: Re: EGT's & Oil Temp |
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The Rotax operators manual indicates the following for oil temp:
Min: 120
Max: 285
Normal: 190 to 230
I can't find anything in the manual regarding EGT. Mine runs a bit on the hot side around 1450.
I'm curious. Is 5500 what you usually cruise at? According to the manual, that's the max continuous rpm for the 912UL. Does it affect the tbo to run at that speed all the time? I generally run at 5100 to 5200 and between 25 and 27 inch/hg manifold pressure (depending on how big of a rush I'm in).
| Quote: | | A question for those with 80hp Rotax 912's. What do you consider a normal EGT and Oil temp when at cruise at about 5500rpm? |
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Luis Rodriguez
Model IV 1200
Rotax 912UL
Flying Weekly
Laurens, SC (34A) |
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michaega(at)verizon.net
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| Posted: Mon Oct 20, 2008 12:42 pm Post subject: EGT's & Oil Temp |
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EGT -- look in (online) 912 installation manual under exhaust page 41. Normal range 1470f -- max 1560f -- take off 1616f.
George
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wingnut
Joined: 11 Jan 2006
Posts: 356
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| Posted: Mon Oct 20, 2008 1:39 pm Post subject: Re: EGT's & Oil Temp |
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Wow. So I'm actually running on the cold side at 1450. My Westach EGT gage only goes up to 1500. Does this mean that my carbs are running a little too rich? How does one adjust the EGT on a 912? Interesting that this is in the installation manual but not the operating manual.
| Quote: | EGT -- look in (online) 912 installation manual under exhaust page
41. Normal range 1470f -- max 1560f -- take off 1616f. |
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Luis Rodriguez
Model IV 1200
Rotax 912UL
Flying Weekly
Laurens, SC (34A) |
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lcfitt(at)sbcglobal.net
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| Posted: Mon Oct 20, 2008 3:46 pm Post subject: EGT's & Oil Temp |
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Louis,
It has been long my understanding that the EGTs on a 912 are pretty much to
look at from time to time and wonder what the number means. The carbs are
altitude compensating up to about 10,000 ft. as I recall. The best check on
mixture is to look at the plugs. This is problematic in a way, because we
usually check the plugs after idling back to the hangar after running them
hard in flight. The idle and high speed jets are set separately. I have
heard that it is wise, from time to time, check the plug color after flight
with minimal idle - like pulling to the side of a grass strip - you lucky
guys.
Regarding the cruise RPM, the max cruise is 5500 and most of the guys I flew
with ran that or close to that as we allways flew at the speed of the
slowest airplane. I also know folks that use that as a max RPM - Just flew
in a SeaRay that the guy maxes at 5300. I have heard Eric Tucker say 5500
is fine for contiuous cruise. I also understand that the biggest factor
with RPM and the 912, is running it too slow in cruise as torsional
vibration at the lower RPMs are not good for the gearbox. Keep it over 5000
to 5100 minimum in cruise.
Lowell Fitt
Cameron Park, CA
Model IV-1200 R-912 UL
Currently focusing on the Left Wing Rudder Gapseal Cuffs and Landing Gear
Fairing
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Tue Oct 21, 2008 2:39 pm Post subject: EGT's & Oil Temp |
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It is especially true to check the plugs with as little idling as possible
on the two stroke engines where oil is burned with the fuel.
Noel
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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JetPilot
Joined: 10 Jan 2006
Posts: 1246
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| Posted: Tue Oct 26, 2010 12:03 pm Post subject: Rotax 912 Series cruise RPM |
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I hit wrong button and posted twice.
Mike
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"NO FEAR" - If you have no fear you did not go as fast as you could have !!!
Kolb MK-III Xtra, 912-S |
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Tue Oct 26, 2010 12:41 pm Post subject: Re: EGT's & Oil Temp |
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Depending on where you live and the altitude you fly EGT's will run 1350F to 1470F under normal conditions. There are several factors that effect this and not purely the fuel. In the warmer months 1420F-1470F is very normal. I would question EGT's over 1500F because even though it can fly there that usually isn't normal. The EGT's can be cooler than 1350F if you fly really high or it is really cold out. Normal oil can be anywhere from 175F-230F for normal temps, again it all depends on altitude and OAT. I also tape my radiator during the winter and try to keep oil temps to at least 200F+. If you live where it is really cold this can be a challenge.
If you live where it is cold you may want to look into a Tanis engine preheat system. they are designed with the Rotax in mind and work extremely well. With OAT around zero the Tanis can have you entire engine block and oil up to 65F-70F. I have installed several of these and highly recommend them. You can see a video on the ROAN website. Quite impressive.
"Normal" cruise depending on your plane is 5000-5300 rpm with the max WOT set to 5500 rpm for the fixed pitch guys. Yes it will run at 5500 all day, but it does cause more wear and tear over time. Of course the 5500 WOT setting may need tweaking if you have special circumstances like flying out of a high elevation field or constantly heavily loaded. And your right, over pitching your prop or running 4400-4700 rpm for cruise is not good for the engine.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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