There isn't much surface area on a sump, compared to the volume of oil it contains. Also, located on the bottom of the engine, the air flow is questionable. Sure, you lose a little heat with those piddly fins on there, but it's not its prime function. An oil cooler system with proper air flow is the only way you'll get rid of most oil heat in an air-cooled engine.
I'm not advocating a higher-volume oil pump. At least, not without addressing the oil system as a whole. Just dropping one in and expecting it will somehow "help" is just asking for trouble. If you start losing oil out of an engine, it isn't going to make a difference what volume the oil pump is. When you lose oil *pressure*, it's just a matter of (not much) time before the engine seizes. Why did you lose engines twice? ________________________________ From: Gary Hinkle <Gary19521 at verizon.net> Sent: Saturday, April 30, 2016 9:43 PM To: KRnet Cc: Brian C Wagner Subject: Re: KR> FW: Type 1 Cylinder Heads - cooling The sump is not the worst place to shed heat. Do the math and look at how many square inchs of surface there is. Why do you think there are fins on the sump? Not only that, the heat is wicked around the entire crank case. This is why the top of the case gets hot. The oil cools the crank, rods, pistons, valves, and so on. The heads aren't the only path for heat transfer. And yes, I use a cooler. Look up the amount of Btus that a cooler can shed per Sq in. You may be surprised how limited it is. I'm not trying to be a pain. But if someone is going to all the work to pump a large volume of oil into the heads, for which it was never designed to handle, they most likely could be landing when they don't want to due to engine failure. Have you ever flown an airplane with oil comming out of the engine at a high rate. I have, and you will have one heck of a pucker factor. And I have lost engines in flight twice. Pumping extra oil into the heads would be best be done in a test cell for many hours of running to get it right. If at all. Sent from my Verizon Wireless 4G LTE smartphone -------- Original message -------- From: Brian C Wagner via KRnet <krnet at list.krnet.org> List-Post: krnet@list.krnet.org Date: 04/30/2016 09:29 (GMT-05:00) To: KRnet <krnet at list.krnet.org> Cc: Brian C Wagner <brianw at siu.edu> Subject: Re: KR> FW: Type 1 Cylinder Heads - cooling I'm sorry, but this is wrong. The sump is the worst place for cooling to happen. Heat is radiated away only at that relatively small amount of surface area, per volume of oil. I'm not familiar with VW aircraft installations. Are you using an oil cooler of any type? A car installation includes the integral cooler that air is forced through. It is there, and throughout the engine's radiating surface, where heat is exchanged to the air. ________________________________________ From: KRnet <krnet-bounces at list.krnet.org> on behalf of Gary Hinkle via KRnet <krnet at list.krnet.org> Sent: Friday, April 29, 2016 9:52 PM To: KRnet Cc: Gary Hinkle Subject: Re: KR> FW: Type 1 Cylinder Heads - cooling While everyone is toying with extra oil to cool the heads. Don't forget, you would pull more oil from the sump. Which would leave less to be cooled. Leading to hotter oil, hotter heads.This is a bad idea. Period! The engineering to fugure out the amount of oil needed in sump, out put of pump, thermal shed, and so on, is way beyond anything worth doing for the amount of return.Power = temperature. This little engine is pretty much putting out all it can, and still remain reliable. NASCAR doesn't use Detroit engines from production cars. They are specially designed just for that class car and special usage.I don't want to seem like a poop. It's just how it is.Gary Hinkle. Corp, Cargo pilot, and seems like forever A&P. Sent from my Verizon Wireless 4G LTE smartphone -------- Original message -------- From: Chris Prata via KRnet <krnet at list.krnet.org> List-Post: krnet@list.krnet.org Date: 04/27/2016 02:40 (GMT-05:00) To: krnet at list.krnet.org Cc: Chris Prata <chrisprata at live.com> Subject: KR> FW: Type 1 Cylinder Heads - cooling thats an interesting angle. your oil post also reminded me I was going to ask about *additional* oil to cool the heads, as in a high vol oil pump, and an oil line to each head spraying oil on the hottest area (between the valves?). would that almost make them "liquid cooled heads"? List-Post: krnet@list.krnet.org Date: Tue, 26 Apr 2016 12:28:29 -0500 Subject: Re: KR> Type 1 Cylinder Heads From: lrffrench at gmail.com To: krnet at list.krnet.org CC: chrisprata at live.com Hi KR league, of all the discussions that are so important about controlling heat, I am surprised that so little discussion of oil happens. This is a big decision. My research for my 1835 vw and oil has led me to Quaker State DEFY. I am running the 10w30 and the API-SL class. This is a semi- synthetic with boosted zinc for anti-friction. In aircraft we can't use a full synthetic because lead in av-gas will destroy the anti-friction adds in the pure synthetics. Even if we plan to use mogas primarily, there may be the need to use av-gas all of which have high lead. The molecule size in synthetics, even the blends, is smaller and is known to run cooler. Note: Quaker State DEFY is in almost identical containers with API-SN class oil. (Strange). SN doesn't have the boosted Zinc. You have to read the small print to get API-SL. The SN class has been made for the auto engines with catalytic converters because the high zinc has been known to ruin the catalytic converters. Since aviation does use them (yet), we can benefit from the zinc friction reduction. Hope this isn't noise on many of the great signals I read everyday from you pros.Cheers,Rene Ffrench N44774. Austin, Texas _______________________________________________ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options _______________________________________________ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options _______________________________________________ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options
