stobbie Posted November 1, 2016 Share Posted November 1, 2016 I have a 3,9 V8 in een Defender. It was running hot on idle. I have now fitted bigger fans en blanked off the oil cooler and now it sits at 88 degrees for hours. The extra heat of the oil cooler adds a few degrees to the coolant. I don't have much space for an external oil cooler because I allready have a auto gearbox cooler and an aircon condensor in front of the rad. Can the 3,9 be run without the oil cooler for normal road use? I do have a customer who's running one without oil cooler but that's an old man who does 1000 miles a year... Quote Link to comment Share on other sites More sharing options...
Davo Posted November 1, 2016 Share Posted November 1, 2016 I don't see why not, after all people put a 3.9 in place of a 3.5 without necessarily adding a cooler. I still wonder if there's something else going on, though. It's not exactly a hot climate up that way. Quote Link to comment Share on other sites More sharing options...
Cynic-al Posted November 1, 2016 Share Posted November 1, 2016 I don't know if you could fit it but the disco had a single radiator with engine water, engine oil and gearbox oil all in one unit. That's what I used when I put a 3.9 in my rrc but obviously it's a different shape at the front. If you run without just keep an eye on the pressure gauge, warmer oil will flow easier and make less pressure. Guess you could put thicker oil in? I ran mine on 20w50 anyway. Quote Link to comment Share on other sites More sharing options...
stobbie Posted November 1, 2016 Author Share Posted November 1, 2016 @Davo, yes it is strange, but I can't think of anything anymore.. I have a puma heater so it the flow of coolant will be blocked off at the heater when it is set at cold and that's not a good thing with a V8, but we don't have a thermostat fitted, so there should be flow. But that is the last bit that could cause some strange behavior. @cynic-al, I have a td radiator fitted. But because of the hot oil the water is hotter as well, so the temp is higher with the oil cooler in the radiator Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted November 1, 2016 Share Posted November 1, 2016 Should be able to run it happily without a cooler. I run both 4.6's with no cooler, one of them doesn't have a heater plumbed in and both are fine. Both run stats, both run twin electric fans. Temperature telltale labels are your friends: Quote Link to comment Share on other sites More sharing options...
stobbie Posted November 1, 2016 Author Share Posted November 1, 2016 I'll buy a few of those.. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted November 2, 2016 Share Posted November 2, 2016 I tend to slap one on the oil filter, never seen them get anywhere near too hot. Bear in mind oil can happily run much hotter than your coolant, and cold oil doesn't work as well. Quote Link to comment Share on other sites More sharing options...
stobbie Posted November 2, 2016 Author Share Posted November 2, 2016 that's a good idea! Quote Link to comment Share on other sites More sharing options...
skauldy Posted November 2, 2016 Share Posted November 2, 2016 plenty of guys on V8forum close off the oil cooler ports, then again there not towing much Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted November 3, 2016 Share Posted November 3, 2016 How about a 4.6 V8 with no oil cooler towing a 4.6 V8 with no oil cooler? 2 Quote Link to comment Share on other sites More sharing options...
skauldy Posted November 3, 2016 Share Posted November 3, 2016 Badass Quote Link to comment Share on other sites More sharing options...
Cynic-al Posted November 3, 2016 Share Posted November 3, 2016 Yes, I can see it, just to the right of the telegraph pole, a newly formed hole in the ozone Quote Link to comment Share on other sites More sharing options...
Arjan Posted November 4, 2016 Share Posted November 4, 2016 That's a nice picture !!!! Can you tell more about the 110 please ? Quote Link to comment Share on other sites More sharing options...
HoSS Posted November 4, 2016 Share Posted November 4, 2016 You can, i did. But why not put one in, it only helps. I fitted a Mocal just behind the radiator (and remote filter). Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted November 4, 2016 Share Posted November 4, 2016 38 minutes ago, HoSS said: You can, i did. But why not put one in, it only helps. I fitted a Mocal just behind the radiator (and remote filter). My reasons: More plumbing to do Less space in engine bay Another thing to leak, get damaged, fill with mud, or go wrong Over-cool oil is as bad as over-hot oil Another thing to buy It's not actually needed (temperature stickers say so) 1 Quote Link to comment Share on other sites More sharing options...
honitonhobbit Posted November 4, 2016 Share Posted November 4, 2016 Arjan, It's a 109, with some portals slapped on and a 4.6 V8 to drag it along Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted November 4, 2016 Share Posted November 4, 2016 Arjan: 109" Classic Restoration Quote Link to comment Share on other sites More sharing options...
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