240 degree oil temperature

[wild85]

When I cruise down the highway in my truck with 357 and th350, 3.73 gears and 28 inch tires at 3000 rpm or like 64mph. The oil will get to 230-240 and I am just cruising easy. What the hell is that all about. Max oil temp is supposed to be 190 I have read. What could be wrong with my engine to have this happen? The engine has 6500 miles on it. I have the autometer gauges and the oil temp sender is in the oil pan. I personally believe the engine is a dog from my 14.31 1/4 mile times. Just wonder what is making it a dog and why the oil temp and water temp like to skyrocket. Water temp will between 200-212 on the highway in 77-86 degree weather. Can you help me out here guys. The truck is parked now but I wonder WTF. http://www.s10v8.com/images/smilies/icon_frown.gif

[wild85]

Oh yah, it doesn\'t matter if I have synthetic or regular oil in it either.

[spacecadet]

Oil is the engines life blood. The oil touchs every compont inside the engine preventing it from overheating. The oil gets hot due to the friction and the heat from the combustion chamber. The oil temp will rise in proportion to the water temp.

I would be lead to believe there is a cooling system problem that may be starting. According to which tstat your running it might be right on. The 195 tstat will operate @ 200 to 210. Most go with a 160 tstat so their cooling system will stay under 190. If your systme can handle a higher pressure rad cap, install one. For every 1 pound of cap pressuer it will raise boiling point by 3 degres.

[wild85]

space.

I have the 4.3 rad brand new, victor jr h20 pump, 160 mr gasket tstat, two 12\" e fans. and water wetter. and 16 lb rad cap

[wild85]

I have also found that the oil temp does not correlate to the water temp, is different all the time.

[spacecadet]

Honestly I wouldn\'t be too concerned with the oil temp, in comparison to the water temp. The 2 12e fans may work great in traffic or at an idle but they may be the problem at crusing speed. At speed the air gets pushed onto the rad creating a \'high pressure zone\', and the airflow under the truck creates a vaccume. The air gets sucked through the rad. If their is too much fan + housing in the way it will restrict the airflow and make the truck run warmer than it should.



My only example I could think of is a s10 blazer with the hatch open. If the hatch glass is open and the door windows are closed the exahust fumes roll in through the back window and lingre. If you roll the windows down there is a tremendous breeze that blows right on through nad cleans all the fumes and alot of the papers laying on the back seat out the window. If the back window wasn\'t open, the breeze you usually get in an s10 blazer is equavilent to the rush of wind when someone walks past you briskly.

Maybe it was a bad example but, it gives you an idead how the wind gets sucked through the rad and not just pushed.

Maybe an airdam mounted to the bottom of the rad support might help. Or a 18\" pump operated flex fan.

Space.

[wild85]

the efans are on the inside of the rad pulling, I have an air dam, I have even cut the cradle so more rad is showing, then before

[afghanimobilerawks]

oil cooler? dunno if its a good idea.... but.... could help.....

[wild85]

Its a good idea. I have two tranny coolers and don\'t think I need both so I will flush one of them and run engine oil through it. I still don\'t think I should be seeing that much heat though.

[92sdime]

Two things I can think of that can cause an engine to get hot quick is timing being off carb not being right for it...IE not enough gas....Im no expert by anymeans, just a thought.

[wild85]

I agree, timing is at 43 total, I am told that not enough timing creates heat, not too much, carb is a 670 avenger

[92sdime]

43 total...seems like a bit much to me..Usually its around 34-38 total timing for optimal performance on most street sbc\'s. To much timing can also create a problem with heat.

[wild85]

I forget which way retards the timing? How much would I turn it to get 36 form the already 43?

[MOREPOWER]

I d say don\'t worry about it.. U don\'t think of the rpms of the motor ?? THats alot of heat to disipate. At 3000 rpms constantly! Mine runs same. Running a colder t stat. 160.. In my opioion Didn\'t do notin except make it run hotter.. But notin is all alike. UR choice.

[QuickV8s10]

Your timing is one reason it getting hot. You need to set it at about 36 and you need to check the jetting of the carb if it to lean it can cause it to get hot and to lean it not good for a motor. You need to pull a plug and check the color if its white or real light brown you are running to lean if its black its to rich the plug should be a dusty brown color. I run a 180 in mine and it stays at 190 to 195

[wild85]

The plugs are white and a little bit brown. Probably lean.

[QuickV8s10]

yep just go up a jet size front and back and set you timing. You should be good to go

[speeder]

I believe that the oil temp is supposed to be hotter than the water. Also you need to check is the temp your oil can handle. I think that your exhaust being close to the block can heat up the motor. I would not add any cooler, just make sure your oil does not break down by observing its color and smell.