Today's Message Index:
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1. 07:17 AM - High Oil Temps (airman@appledumplings.com)
2. 07:51 AM - Re: High Oil Temps (flyv35b)
Message 1
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--> TeamGrumman-List message posted by: "airman@appledumplings.com" <airman@appledumplings.com>
Ok I went flying yesterday and the Oil temp climbed up to around 230
again.
When just flying around in the airport area a few days before the
temp stayed at 180-190. But I only flew for 20-30 min.
So Yesterday I flew around for about an hour. At first the temps
stayed down but then they started to get up to 210-220 range.
I stopped and got some fuel. On my way back to my airport I noticed
that the temps went up. I was in cruise and I went to full rich to
see if that would help and then i tried reducing power. It steadiy
increased. I think it may have have gone as high as 235 but was able
to get it to stabilize around 230.
I previously did some sealing on the baffle seals near the oil
cooler and on both sides between the cylinders. Does anyone have
pictures of what the baffle/baffle seals should look . I am also
considering redoing all the baffling and baffle seals ... are there
kits?They dont look that great to my untrained eyes. What are the
thoughts on oil coolers?
I know there are high dollar changes such as new cowlings and cowling
mods but I think i should be able to get a handle with the stock
config also(at least reasonable temps) ... with maybe a stcd oil cooler.
Thanks
Thomas 74225 D73
Message 2
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| Subject: | Re: High Oil Temps |
--> TeamGrumman-List message posted by: "flyv35b" <flyv35b@ashcreekwireless.com>
> Ok I went flying yesterday and the Oil temp climbed up to around 230
> again.
> When just flying around in the airport area a few days before the temp
> stayed at 180-190. But I only flew for 20-30 min.
>
> So Yesterday I flew around for about an hour. At first the temps stayed
> down but then they started to get up to 210-220 range.
> I stopped and got some fuel. On my way back to my airport I noticed that
> the temps went up. I was in cruise and I went to full rich to see if
> that would help and then i tried reducing power. It steadiy increased. I
> think it may have have gone as high as 235 but was able to get it to
> stabilize around 230.
>
> I previously did some sealing on the baffle seals near the oil cooler
> and on both sides between the cylinders. Does anyone have pictures of
> what the baffle/baffle seals should look . I am also considering redoing
> all the baffling and baffle seals ... are there kits?They dont look that
> great to my untrained eyes. What are the thoughts on oil coolers?
>
>
> I know there are high dollar changes such as new cowlings and cowling
> mods but I think i should be able to get a handle with the stock config
> also(at least reasonable temps) ... with maybe a stcd oil cooler.
First off let me say it is very helpful if when you post a question or
comment to say 1) what model of Grumman you have and 2) what engine it has,
especially if is not stock or is modified in any way. This has an important
bearing on how the question is answered instead of trying to guess what the
configuration is. This applies even if you have previously stated this as
some time may have elapsed and people forget. Heaven forbid!
One thing that jumps out is your comment about stopping for gas and then the
oil temp climbed higher on the next leg of the flight. This is exactly what
I would expect it to do. The engine sits on the ramp and heat soaks when
you are stopped and then when climbing out at low airspeed it increases even
further. If you have a 2 place with the O-235-C2C engine it is pretty
normal for the oil temp to run up near the redline on climb anytime the
ambient is high. Also, how was it outside when you were flying? If you
have a Tiger or Cheetah the oil temp will usually not run over 200F unless
you have the HC engine conversion on the Cheetah and the stock cooler. A
larger Tiger cooler can be installed on a Cheetah.
Also, running rich or lean will not have very much impact on oil temperature
as it can on cylinder head temperature. Obviously, running with hotter
cylinders will heat the oil up a bit more in time. But it does take some
time for the oil to react.. The front baffle seals on a Cheetah and Tiger
that are hidden inside the nose bowl are every bit as important as the ones
you can see on the side and rear of the engine. The Cheetah is even harder
to seal than the Tiger because of the jogs around the NACA air inlet duct.
Cliff A&P/IA
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