To put it simply, an oil cooler is basically a radiator with oil running through it instead of water. Oil coolers are an important part in keeping any well running engine continually running well even when pushed to the limits. Maintaining a proper oil temperature is important not only to keep the oil at its proper lubricating state, but also to help the engine coolant in keeping the engine cool.
Most production cars these day uses a Heat exchanger for both cooling and heating the fluids.On Cold starts the oil and water will help each other get to working temperature.But when things really get hot the oil temperature can make the coolant temperature rise and vica versa.There is also the risk of rupture in the heat exchanger, this can let the fluid with the higher pressure into the lower pressure side, which could lead to oil or water dilution and the end of your engine, or transmission.
The basic rule of thumb, most will add as big an oil cooler as can fit in a space that they have with good airflow, and then later add a thermostat so that the oil can be kept at a proper temperature.
The oil cooler is designed to come in a one pass, or multiple pass design. This means the amount of times the oil will pass across the length of the cooler before it exits. The idea being that the more passes the oil makes across the cooling front, the more heat the oil will be able to shed. Another important part of the design is inlet and outlet size. Be sure to choose a size that will not be too small and restrictive, as this will cause a drop in oil pressure.
Usually -8an or -10 an size fittings are sufficient. Also be sure to try and minimize length and number of bends in the oil lines as your run them to the coolers location.
A cars engine is happiest when it has good, clean oil running through it. To do this oil wants to be between 82 - 98 degrees Celcuis. If the oil is too hot, it will start to break down and separate causing the oil to thin, and the oil pressure to drop to dangerous levels. Having oil that is too cold can be damaging as well since the oil will not be up to temperature and not at its proper viscosity level. The best solution is to add a thermostatic controlled oil cooler.
What the thermostat does is keep the oil cooler semi closed, so that oil can be quickly brought up to temperature. Then the cooler is variably opened to maintain proper oil temperatures. If you opt to not install an oil cooler thermostat, make sure to warm your car up before driving to give the oil time to heat up to a proper level.
NOW..We start modifying the car , more power = more heat being produced, this puts alot of stess on the cooling parts of the engine, oil teperature starts running away, coolant teperature getting out of hand, and so the story goes....
Most of SAiC's products is designed specifically for this HEAT MANAGEMENT!!