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Re: Conversion to oil as coolant?
Hummm. lots of replies in a short time. Thanks.
Advantages... well actually over a 50/50 maybe not as much as I was first thinking... too many raw water cooled and corrosion and plugging issues in my past that a 50/50 and heat exchanger wouldn't have now that I think about it although the raw water side of the exchanger would still have those issues... just less costly and easier to fix than an engine.
Exhaust will be cooled via the discharge of the raw water coming from the heat exchanger as is normal... I'd just like to have the exchanger's raw water jacket self drain upon pulling... one less thing to prep for winter. I'd like the configure the exhuast system to do the same if possible. May not be able to.
Only reason I wondered is I have a 4 cyl Deutz 2011 (about 50 hp) that is oil cooled and sitting in the shop waiting for me to do something with (I need to custom build a special sleeve for one cylinder due to it swallowing a valve). Got the whole complete engine for 75 bucks so I took a chance I could repair it. Not sure what I'll do with it, but I'll think of something on this place it can do.
Not sure what their assumed advantage is, but Duetz charges a premium for their oil cooled engines. They circulate the lube oil through the cylinder and head cooling jackets and then through a what in essence is a very large conventional oil cooler using air as the ambient medium (like a radiator). Since these are hard working industrial engines designed to work at 90% capacity and periods at 100% 24/7 it has the benefit of cooling the oil too (hard working engines can get pretty high oil temps in continuous operation). Maybe its only advantage is one cooling system and not a radiator and oil cooler both being cooled by the same air (a common problem on all our vehicles too BTW). I think Duetz is just drawing out of the oil pan for the cooing system and not connected with the lube pressure system direct... they'd have to do it like this due to flow and pressure differences between the two systems I believe.
Flamability?... actually there are non-flamable oils... but heck diesel is burnable but not classified "flammable" in the true sense as it takes quite a bit to ignite it (high vapor point, low vapor presure).
For long cruises under power in a marine installation it is a continuous work application... maybe not at 90%, but for sure at 80% continuous if propped right and not quite full throttle in cruise mode... so it made me wonder. Doesn't matter if its 26 hp or 2600 hp, temp control needs are still there.
I'm doing the swap this summer, so now is the time to think through any system changes.
1980 Seafarer Swiftsure 30
1978 Bayliner Buccaneer 270 (now sold and being restored in FL)
1962 SeaMac 14' Plywood Runabout, mahogany decked, with 1959 Evinrude 35 Big Twin (owned since age 17, I'm now 60)
Last edited by dem45133; 07-28-2013 at 03:39 PM.