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N1468

 
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dusterdan



Joined: 11 Feb 2006
Posts: 80

PostPosted: Sun Aug 07, 2011 4:57 pm    Post subject: N1468 Reply with quote

Hi guys. I'm enjoying flying and working the bugs out of my SA-300 again. Fixed a fuel leak and an oil leak, both minor probs. Got my oil pressure up to the 70-80 range with Don's help. Currently working an oil temp problem. It creeps up to about the 215-220 range and I would like to see 210 or less. My first attempt at baffling didn't look so good so I used the re-enforced type across the back top of my LYC IO360. It still tends to lean forward and down slightly due probably to the stretch on the top curvature. Seems like the air pressure should cause it to seal properly but I'm considering a temporary solution using aluminum tape to secure the baffle to the inside of the cowl top for a few flights. The sides appear to be well sealed. I love what the HB tailwheel has done for landing this airplane. It now does a nice 3-point from an approach at 80 with just a tad of power to prevent a high sink from developing. The tail sits slightly lower to the ground so I was hoping for this result. I'm wanting to get to one nice fall fly-in if everything works out.
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Dan Benkert, N1468
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Bob E.



Joined: 31 Oct 2007
Posts: 147
Location: Central ND

PostPosted: Sun Aug 07, 2011 7:25 pm    Post subject: Reply with quote

Dan,

Good to here things are working out with the duster. As for the cooling issue, have you considered the exit area at the bottom of the cowl? Do you have a "lip" on the forward edge of the opening? Sometimes this area can be the cause of improper cooling as much as baffles not sealing correctly. Just a thought.

Bob
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dusterdan



Joined: 11 Feb 2006
Posts: 80

PostPosted: Mon Aug 08, 2011 7:09 pm    Post subject: Reply with quote

Bob, it has a lip, is that good or bad?
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Dan Benkert, N1468
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Bob E.



Joined: 31 Oct 2007
Posts: 147
Location: Central ND

PostPosted: Mon Aug 08, 2011 7:44 pm    Post subject: Reply with quote

Thats probably good, they are found on other "store bought" airplanes. The lip helps create a low pressure and aids in the air exiting the lower cowl.

A few years back I was involved with an engine modification program where we were converting a 1340 powered Air Tractor to a 600HP liquid cooled V8 Orenda engine. We were having cooling issues and kept adding openings in various locations on the cowl to let air out which we thought would improve airflow through the radiator. We even did an airflow study where we had several airspeed indicators set up with tubes running to different areas inside the cowl to measure airflow. It turns out the openings didn't do a whole lot until we added "lips" to the leading edges of the openings! The temps during our climb cooling tests improved considerably.
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dusterdan



Joined: 11 Feb 2006
Posts: 80

PostPosted: Wed Sep 28, 2011 9:10 pm    Post subject: oil temps Reply with quote

This oil temp issue is persistent. I have calibrated the indicator, installed a new 50% larger oil cooler, improved the baffling , and installed a new vernatherm. All I'm seeing is a minor improvement. ( temps cycle between 200 and 215). On the last flight I landed on pavement and noticed a slight popping in the exhaust. Engine has just under 5hrs SMOH. Timing is OK so now I'm wondering about valve guide clearances. If the guides are tight, would this relate to elevated temps? Maybe it's time for the rope trick and a reamer. Any thoughts on this would be welcome. Dan P.S. Is it possible for a cooler installed with the hoses at the bottom to entrap air and lose efficiency that way???
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Dan Benkert, N1468
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jsh



Joined: 19 Dec 2005
Posts: 354
Location: Burnet, TX

PostPosted: Thu Sep 29, 2011 5:47 am    Post subject: Reply with quote

Dan, couple of comments.....in your first post you said you wanted 210 or less, you now have 200-215. sounds pretty close to me. second, it has been my experience and understanding that until the break in point on your engine (you have only 5 hrs?) you will see slightly elevated oil temps. mine certainly did this. at about the 8 hour point on mine, I saw about 10-15 degree drop. it was dramatic, occurring during a single 20 minute flight. if it was me, I would fly it another 5 hours and watch for a temp drop during that time, before I started doing other things.
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dusterdan



Joined: 11 Feb 2006
Posts: 80

PostPosted: Thu Sep 29, 2011 6:52 am    Post subject: Reply with quote

Good points JSH. I didn't mention that the cylinders are cerminil which seat the rings much sooner than steel or chrome. The oil temps are OK on cooler days, but my main concern now is the possible valve sticking indications. Given that mags and harness are new and set by the book I can't think of any other reason for the popping exhaust even when properly leaned at idle. Cold compressions are also 78s. I will continue short hops for a while to get more data but need to see improvement soon. If it is the guides, they will get worse. Dan
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Dan Benkert, N1468
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bmcj



Joined: 05 Dec 2005
Posts: 810
Location: California, Fresno

PostPosted: Fri Dec 02, 2011 11:16 am    Post subject: Reply with quote

Just wondering... when I look at all of the threads on this forum, this particular thread name is displayed in a slightly lighter blue. Does anyone else see it this way and does anyone know why it would be this way?

Sorry to divert from the original topic, but I thought the best place to ask this question is in the affected thread.

Bruce Confused
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Bruce

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Dan Benkert



Joined: 02 Dec 2005
Posts: 76
Location: Rapid City, SD

PostPosted: Tue Jun 19, 2012 9:58 pm    Post subject: oil temp Reply with quote

I have 4 flights on N1468 with the new 3 way gauge installed. It registers better oil pressure(80-85) and oil temps (190-195). If the new gauges are truly superior to the old ones, I never had an oil temp issue and the pressure was acceptable as well. Time to plan some extended trips and have some fun. Dan
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Dan Benkert



Joined: 02 Dec 2005
Posts: 76
Location: Rapid City, SD

PostPosted: Mon Jul 16, 2012 5:34 pm    Post subject: Birthday flight Reply with quote

I was honored to give a birthday ride last Sat to a 92 year old combat veteran of WWII. Chuck Childs flew 37 combat missions in B17s for 15th Air Force out of Italy. Prior to that deployment he instructed Army Air Corps students in B17s, B24s, B25s, P40s, P51s, and several others. It wasn't easy for him to get in/out of the front cockpit but the smile on his face after landing was well worth the effort. I was smiling as well when he presented me with an autographed copy of his book detailing every mission he flew. He has personal memories of guys like Doolittle, LeMay, Twining, 3 fingered Jack Ryan, and many escort pilots including the Red Tails. I'll savor this memory forever.
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Tom Wilson



Joined: 04 Dec 2005
Posts: 150
Location: Fallbrook, California

PostPosted: Mon Jul 16, 2012 9:14 pm    Post subject: Reply with quote

Good on you, Dan.

Meeting those WWII pilots is a special pleasure that's gotten all too rare.

So glad you were able to make the ride happen.
tw
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