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aox1969(at)earthlink.net
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 Posted: Tue Jan 08, 2013 1:17 pm Post subject: Jabiru 3300 Ideal Oil Temp |
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Gentlemen,
This is my first winter with a Jabiru J-230 (with a Jabiru 3300 engine); and, I'd like your thoughts on the ideal Oil Temp, and the methods that you use to increase the Oil Temp.
My cruise (2800-2900 RPMs) Oil Temp was 140 F with an OAT of 30 F.
Since I was under the impression that the Oil Temp should be at least 180 F, to boil off the impurities; I covered the Oil Cooler Inlet to attempt to raise the Oil Temp.
With 1/3 of the Oil Cooler covered the Oil Temp increased to 152 F.
Next, I covered 2/3s of the Oil Cooler and that increased the Oil Temp to 163 F.
Then, I covered All of the Oil Cooler and that increased the Oil Temp to 174 F (it did get to 186 F in a 90 kt climb).
Please help me with your thoughts on this issue.
Thank you
OldNavy w/a Jab
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BARRY CHECK 6
Joined: 15 Mar 2011
Posts: 738
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| Posted: Wed Jan 09, 2013 7:23 am Post subject: Jabiru 3300 Ideal Oil Temp |
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Tally Ho Old Navy - This is Old Air Force:
Yes, you are correct about the temps. They should be around 180 F (170 to 200 F). Those temps are for a reason:
1 - It is what the oil manufacture recommends.
If you fly a multi-grade oil say 15 W 50 at lower temps you will never see the 50 weight. so you are not getting the proper viscosity for ring sealing nor the proper pressure rating (EP).
2 - When at the temp range of 170 to 200 F what you are burning off is the moisture. I would not call it contamination. It is, but just a bit misleading. When the moisture goes away so do the acid effects of the oil. So, in a way you are correct - - - It is a contamination. But, fits the question which came first, the chicken or the egg? I got the answer to that too.
Blocking off the oil cooler is the first step in maintaining temps. Other tricks are:
1 - Reduce the IN FLOW air
2 - Reduce the OUT FLOW air
3 - Change the flow pattern under the cowl.
Manufactures like Lycoming recommend a MAX CHT difference of 50 Degrees between all cylinders.
I don't quit till I see only 20 degrees difference.
I have installed two oil temp probes on a Lycoming engine. One at the rear of the engine on the accessory case and another at the front of the engine near the Prop Thrust Bearing. Where do you think I saw the highest temps? If you said at the Prop Thrust Bearing you are WRONG! Yea, I would have put my money there also.
Point being - Where are you reading your oil temp?
Check 6
Barry
On Tue, Jan 8, 2013 at 4:16 PM, mdaniels <aox1969(at)earthlink.net (aox1969(at)earthlink.net)> wrote:
[quote]--> Jabiru-List message posted by: mdaniels <aox1969(at)earthlink.net (aox1969(at)earthlink.net)>
Gentlemen,
This is my first winter with a Jabiru J-230 (with a Jabiru 3300 engine); and, I'd like your thoughts on the ideal Oil Temp, and the methods that you use to increase the Oil Temp.
My cruise (2800-2900 RPMs) Oil Temp was 140 F with an OAT of 30 F.
Since I was under the impression that the Oil Temp should be at least 180 F, to boil off the impurities; I covered the Oil Cooler Inlet to attempt to raise the Oil Temp.
With 1/3 of the Oil Cooler covered the Oil Temp increased to 152 F.
Next, I covered 2/3s of the Oil Cooler and that increased the Oil Temp to 163 F.
Then, I covered All of the Oil Cooler and that increased the Oil Temp to 174 F (it did get to 186 F in a 90 kt climb).
Please help me with your thoughts on this issue.
Thank you
OldNavy w/a Jab
[b]
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