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The automotive designers usually call for their engines to run at 212 F oil and water temperature with an oil thickness of 10. This is the viscosity of the oil, not the weight as labeled on the oil can. I want to stay away from those numbers as they are confusing. We are talking about oil thickness, not oil can labeling. This will be discussed later. Forget the numbers on that oil can for now. We are only discussing the thickness of the oil that the engine requires during normal operating conditions.

Where did you get your information?

 

because oil doesn't reach the same temp as water with equal engine heat loading. It takes the oil longer to get hot.

 

I was asking about that
"If your oil is the same as your coolant temp, then the oil isn't lubricating properly."

When oil and coolant are both 212F why oil is not lubricating?

 

For racing purposes the critical point for the 944 type motor is oiling to the #2 rod bearing. Practice shows that this biggest risk of failures. If you fail to keep the #2 bearing floating the motor will blow up quickly. As a result the oils #1 job is to ensure is to keep that bearing. Wear in the rest of the system is really a far smaller concern.

Experience shows that #2 rod bearings fail due to a number of reasons, but hot oil temps, high rpms, and open clearances are big contributors.

So to combat all this thicker oil is a major factor. Thicker (higher viscosity oil) is important because it takes less oil flow to carry the load at the rod bearing. More heat thins the the oil and more rpm generate more heat. Open clearnaces also require more oil flow. All of these mean thin oil can just flow right out past the bearing journals and never carry the loads. As soon as you get metal to metal contact the beraings wil spin. So keeping that film of oil is critical.

I have heard of other race motors unsing thin oil to make more hp, but in the 944 motor it is very likely to cause the #2 bearing to spin. I have seen it too many times.

For my race car I use AMSOIL 20w50 Series 2000 Racing oil. I have found this is best oil to use to protect the rod bearings and ony key factor is that oil pressure is maintained when racing. With Mobil 1 15w50 my oil pressure at 5000-6000 rpm was .5 bar lower than with 25w50 AMSOIL.

 

How much oil pressure you get wit Amsoil at 5000 and at 6000 rpm during racing?

 

Well
I used to see 4 to maybe 4.5 bar in that range with AMSOIL

Now it has been dropping to 3.5 bar. I think my motor is just getting old and tired. I have been racing on it for 5 years now. That is even with a an external 951 oil cooler and oil temps at 230-260F in the sump depending on outside temp and if I am running right behind a car or not.

 

I got my informaton from an oil manufacturer. I'm sure I can find it online someplace though.

This might be a little off topic, but, I'm a crane operator by trade. My crane takes 13 different kinds of oil/grease. It takes 110 gallons of 90w140 gear oil alone.

There is alot of competition for oil manufactures in my industry (because of the massive ammounts of it we use), so they all hand out thier information on thier different products. They all vary a little here and there, but what remains pretty constant is the operating temp for the different products. Thats why oil comes in so many differerent weights. You have to match the weight to the temp. Oils will always lubricate to some extent, but they are made to perform at certian temps. 212 is to cold for an oil to perform at its peak. As I stated before, MOST of them are designed to live between 230 and 250....ish.

 

Thats why the 951 has a oil thermostat

 

And it opens at ?
Part code should be 95110715501

 

I run Shell Rotella T 15w40. Go ahead and **** your pants, those of you who are uneducated in the way of the oil.

 

Oil for "Diesel" engines have alot more detergent in them than "regular" oils.

Sometimes it can cause seals to leak because it cleans all the "sludge" from around the seals..... but if you have a dirty engine, then this is great.

Thats about the only difference. It won't help, or hurt your engine. Just a different mix.

 

Do you track your car? If you do how much oil pressure you get at 6000 rpm wile on track?

 

Link would be nice. I did not find that information myself.

 

Not sure when it opens,, Will have to do some research

 

Engine life and oil temperature
http://www.elephantracing.com/techto...emperature.htm