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Engine cooling

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08 Jan 2018 16:59 #1367 by Chris Carlisle
Replied by Chris Carlisle on topic Engine cooling
Well....... As it turns out, if you look closely at the pic, there are little holes on either side of the big oval center hole under the spinner. They are backed with nut plates. Looks like someone in this poor plane's long past put SOMETHING over that hole which has long since been lost.

So, I took Larry's very helpful Skyport engineering drawings and enlarged them on my printer enough so that the resultant size just overlapped those holes, traced it onto a 0.040/30 piece of scrap aluminum stock, and cut it out on the band saw. Screwed it in place with lock washers and now the oil temp comes off the peg in anything over about 20 deg OAT. The cabin heater works better too.

Thanks again Larry for your help. Anyone else need the template let me know and I'd be glad to mail a copy for the usual fee of $5000 :)

Actually, it's free and I'll even pay for the stamp.

Chris

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18 Dec 2017 10:05 #1336 by Jack Arthur
Replied by Jack Arthur on topic Engine cooling
I have used some foam like from a foan cushion, cut it a little large and stuff it in the hole behind the prop and it helps.

Jack

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17 Dec 2017 19:49 #1335 by Chris Carlisle
Replied by Chris Carlisle on topic Engine cooling
Thanks Larry. That'll be a big help, even if for no other reason I know what hole to plug up now.

Chris

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17 Dec 2017 08:13 #1334 by Larry Snyder
Replied by Larry Snyder on topic Engine cooling
Skyport used to make and sell a plate to cover the oil cooling opening directly below the propeller on the standard nose bowl. When I had asked about it in the past, they sent me the drawings and my mechanic made one up for me. It raises the oil temp 10-15 degrees. I am attaching the drawings to this message, and I'll make sure they are in the files section of this web site.
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16 Dec 2017 18:43 #1333 by Henry Pasquet
Replied by Henry Pasquet on topic Engine cooling
My oil temp does not come off the peg in cool weather either. I think it reads low even in the summer. I use Phillips 20 X 50, so am not concerned. A 50 weight oil could be a problem.

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16 Dec 2017 17:10 #1332 by Chris Carlisle
Engine cooling was created by Chris Carlisle
Dang, it's cold up here in South Dakota and when I fly my 415C, Ser# 504 with a C85-12F in it, with OAT's of less than 35 deg or so, the oil temp never comes off the peg (100 deg F). I can't get a clear answer as to whether there was ever a 'winterization kit' for these planes. I kind of doubt there were wind tunnel tests or CG simulations when the cooling holes in the front cowl were designed but I know that wind flow through it can be quite critical and if disturbed or altered might leave one or more cylinders with inadequate flow. Here's a picture. The small hole on the right of the cowl (left side in the pic) is connected to tubing that leads to the generator and mags to direct cooling air onto those accessories so I'm inclined to leave it alone. The one that's taped over has no such tubing attached and is open to the engine compartment as a whole. Taping it over made no difference in oil temp whatsoever. Temptation is to put a piece of styrofoam in the center hole above the carb intake which opens onto the base of the intake spider where the mixture from the carb is distributed to the individual pistons.

Any suggestions?

Chris

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