Originally Posted by nautic a
Not sure if the Beetles had raw water
circulating through the oil cooler (heat exchanger) though. It seems to me, it is not "air cooled" as you would like to think however, I am not an engineer
I'm not knocking air cooling
per se. I have a 1970 Porsche 911S which I adore. It has a big oil radiator under the right front fender
, a dry sump with separate oil tank holding 12 liters of oil, and two big oil pumps. Does it get some cooling
from oil? Oh, definitely. But since it also has a ducted fan blowing air over heads and cylinders with cooling fins on them, it is officially air-cooled. 90%, at least, of the engine's waste heat is carried off by air. Elaborate measures to cool the oil are made primarily for the sake of better lubrication, not cooling.
Kubota make good engines, and those engines too are fine if they're used for their intended purpose - light duty occasional use without extended high revs or heavy loads.
You'll see here that the engine
manufacturer do not refer to the OC60 as "oil cooled": http://www.kubotaengine.com/products...ries-2/oc60-e4
hype from Mastervolt. Oil has less than half of the specific heat of water
, and therefore less than half of the ability to carry heat. A truly oil-cooled engine
would have to have massive cooling jackets circulating large volumes of oil. An engine pressure lubrication system is not suitable for cooling, other than specific parts
, sometimes (some engines, like my Porsche's, use jets of oil to cool piston crowns, for example). The volume of oil circulated is far too small to provide any major part of the cooling.