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
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
List-Post: krnet@list.krnet.org
Date: 04/30/2016 09:29 (GMT-05:00)
To: KRnet
Cc: Brian C Wagner
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 on behalf of Gary Hinkle via
KRnet
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
Sent from my Verizon Wireless 4G LTE smartphone
Original message
From: Chris Prata via KRnet
List-Post: krnet@list.krnet.org
Date: 04/27/2016 02:40 (GMT-05:00)
To: krnet at list.krnet.org
Cc: Chris Prata
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 primaril