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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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 Posted: Thu Jun 19, 2008 10:06 am Post subject: Oil Temperature and Power Flow. |
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I just read the Star's article on oil temperature and the Power Flow Exhaust System.
I've installed somewhere in the 15 to 20 range of PFSs. I've yet to experience as high of an oil temperature increase as reported. And, I lived on the desert for way too many years. That said . . . .
I did have a customer (79 Tiger, metal cooling ramps) with the original donkey dick PFS. He complained of high oil temps. A clean-up of the baffles helped a little. When we installed the short stack version, a couple of years later, he again complained of high oil temps. Soooo . . .
I installed a set of the larger fiberglass cooling exit ramps. These are similar to the stock fiberglass cooling exit ramps but about an inch and a quarter taller. That makes about 18 square inches of increased cooling area.
I had made these new ramps to get rid of the metal ramps on 78 and newer planes. I had noticed a lot of cracking in the lower right half corner of the cowling on the later planes. It seems that the fiberglass ramp would absorb the vibration and cracking became less of an issue. While at it, I made them a little larger.
The result was a 15 to 20 degree decrease in the oil temperature. Note: He already had the larger oil cooler. I didn't notice any difference in the CHTs.
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Regarding cooling area.
I have been recording massive amounts of data on my new cowling. When I went from the stock exhaust system to the short stack power flow, I didn't notice any difference, outside of the typical range, of any of the temperatures. I didn't change the cooling exit area. I did reduce the inlet cooling area by a little over 1/2.
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Oil temps with my new cowling: Normal operation
In climb on a hot day, I can see just over 200 degrees. Cruise, it usually settles in at 181 degrees. I have the larger oil cooler.
On the airplane with the first production cowling, we're seeing similar results. It has the smaller oil cooler.
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Oil temps with my new cowling: Flight Test, climb cooling test at Vy
When I was told that the oil temp and CHTs would come down as I climbed through 5,000 to 7,000 feet, I didn't believe it. Sure enough, there was nothing I could do to make the CHTs higher or the oil temp higher after about 7,000 feet. Surprised me. The air temp at 1,000 feet, as I began the climb, was 95 degrees.
On the airplane with the first production cowling, we'll be doing the climb test shortly.
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Gary
AuCountry Aviation
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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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| Posted: Thu Jun 19, 2008 8:11 pm Post subject: Oil Temperature and Power Flow. |
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I tried to send this to Lynn, the author, but the email in the Star is wrong. If you know him, could you please forward it to him? Thanks
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| | - The Matronics TeamGrumman-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Gary
AuCountry Aviation
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