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ces308
Joined: 03 Nov 2008
Posts: 317
Location: houghton lake ,mi
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 Posted: Sun Jul 24, 2011 5:43 pm Post subject: new video...oil cooler test flight |
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Hello all...
I got the new oil cooler on and took her for a ride to see how she works....works good ! It dropped my cruise temp by 50* !
http://www.youtube.com/watch?v=DXlXdbL7_zI
Thanks for watching ! Safe trips to all going to Oshkosh...
chris ambrose
M3X/Jabiru A-2200 199.3 hrs
N327CS
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Mon Jul 25, 2011 4:35 am Post subject: Re: new video...oil cooler test flight |
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Chris,
I noticed in this video that you were flying with left door removed. Any affect on yaw with only one door removed?
I also noticed at the end of the video you mentioned that rear cylinders (CHT I presume) are running about 320F and your oil temp before installing the oil cooler was in the 220-230F at 75F OAT.
This summer, is the first time my oil temps got into the yellow area (>212F), so I was considering adding an oil cooler but probably won't since the heat wave seems to have passed. Yesterday, with now normal high temps in low 80s, I was seeing 195-200F oil temps and 270-280 CHTs.
FWIW, my CHTs rarely get to 300F except in extended climb at full throttle. I'm wondering why so much difference. My engine is serial #1574 (solid lifter). Is yours a solid lifter or hydraulic lifter engine. I've heard that the hydraulic lifter engines tend to run a bit hotter.
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Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
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zeprep251(at)aol.com
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| Posted: Mon Jul 25, 2011 5:03 am Post subject: new video...oil cooler test flight |
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Chris,
Notice any handling difference with one door of?
G.AmanMK3C
--
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ces308
Joined: 03 Nov 2008
Posts: 317
Location: houghton lake ,mi
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| Posted: Mon Jul 25, 2011 5:13 am Post subject: Re: new video...oil cooler test flight |
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Good morning Thom,
My ser # is 1228 and is a solid lifter engine...The heat probs were on the front (forward half of the engine) until last week. I had no idea what the rear cylinders were doing and is why I over heated that back cylinder last winter ground running it.Being that Jabiru is saying 358* in cruise,I figured 320* in cruise was ok...I am thinking of cutting the scoop off just above the spark plug hole and raising the top half about 2-3 inches in hopes of catching more air....any thoughts on that??
Only on 90* and up temps would my oil temp hover between 239-246 and when throttled back to 25-2600 it would come back down to 238-241...Last weekend when it was 95* my rear cylinders were 320-322 in cruise...I'm glad I finally put the cooler on...been kicking it around the 2 years now...
chris ambrose
M3X/Jabiru A 2200
N327CS
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Mon Jul 25, 2011 5:52 am Post subject: new video...oil cooler test flight |
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Chris,
I don't know that much about the cooling ducts provided by Jabiru and have not had to do anything to mine since I bought it. The builder did modify the entrance by trial and error placement and size of the aluminum plates in the lower part of the duct entrance. He said that getting this part right is the secret to getting all the cylinders cooling well. Next time I am at the hangar (late this week probably) I'll take some measurements and photos of how mine is set up and post them.
I'm also curious about your EGTs. I have installed only one and it has been running too cool at cruise and too hot at WOT climb so I ordered several leaner cruise jets (needle jet) and several richer main jets and installed them. Did not make much difference in cruise but did lower EGTs a bit on climb. My carb still has the original Bing jet needle, not the newer Jabiru designed one. What EGTs are you seeing and is your carb stock?
Thom
On Mon, Jul 25, 2011 at 9:13 AM, ces308 <ces308(at)ldaco.com (ces308(at)ldaco.com)> wrote:
[quote] --> Kolb-List message posted by: "ces308" <ces308(at)ldaco.com (ces308(at)ldaco.com)>
Good morning Thom,
My ser # is 1228 and is a solid lifter engine...The heat probs were on the front (forward half of the engine) until last week. I had no idea what the rear cylinders were doing and is why I over heated that back cylinder last winter ground running it.Being that Jabiru is saying 358* in cruise,I figured 320* in cruise was ok...I am thinking of cutting the scoop off just above the spark plug hole and raising the top half about 2-3 inches in hopes of catching more air....any thoughts on that??
Only on 90* and up temps would my oil temp hover between 239-246 and when throttled back to 25-2600 it would come back down to 238-241...Last weekend when it was 95* my rear cylinders were 320-322 in cruise...I'm glad I finally put the cooler on...been kicking it around the 2 years now...
chris ambrose
M3X/Jabiru A 2200
N327CS
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Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
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ces308
Joined: 03 Nov 2008
Posts: 317
Location: houghton lake ,mi
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| Posted: Mon Jul 25, 2011 12:24 pm Post subject: Re: new video...oil cooler test flight |
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Thom...
First thing ...I can tell no difference with 1 door off...I take alot of pictures and they come out much nicer with the door off...AND it's half as windy leaving 1 door on...lol
Second...Since I moved the temp probes to cylinders 1 & 2...my egt's are on 3 & 4 and they run 1310 and 1186 respectively... when I had the muffler off last week cyl 1,3,4, all had a nice dark tan / light brown to the exhaust pipes but 2 was a real light tan..like maybe running a little lean.Couldn't see where it could have been maybe sucking a little air...??
What the heck should they be running at anyway?? And Jabs seem to have weird fuel distribution habits....
chris ambrose
M3X/Jab
N327CS
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Mon Jul 25, 2011 1:11 pm Post subject: Re: new video...oil cooler test flight |
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Chris,
The target EGT range for cruise (70% power or less) is between 1256F and 1382F. At any power setting above 70% they want it richer, in the range of 1184F - 1256F. Mine runs up to over 1300F during climb at 55 mph and WOT but decreases to around 1250 or so if I increase the climb airspeed to 60 mph or above. That is good enough for me since 60 mph is Vy in my Slingshot. At cruise mine is running around 1225F or so, even with the leaner needle jet per Jabiru's recommendation. I think I need the Jabiru jet needle to get it right. Of course, it could be the our props that make the difference. Mine is a good bit longer than yours (64"). My plugs are a little on the dark side of ideal which more or less confirms the EGT readings.
Pete Krotje of Jabiru USA says you can bias the mixture a bit from one side to the other by tilting the carb 10-15 degrees or so to one side but I don't recall which way he says to tilt it for the bias you want. I have only one EGT probe and 3 CHTs. My CHTs all run within 20 degrees of each other under most all conditions.
In the hot wx we've had recently, I'd like very much to be able to fly without a door.
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Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
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