Frequently Asked Questions

Can I adjust or change the oil pressure?: Only the by-pass pressure can be changed by changing the by-pass spring, not the idle pressure. Some of Melling Select Performance oil pumps offer spring options.
How far from the bottom of the pan should my screen be?: Oil pump pickup screens need to be 3/8” to ½” from the bottom of the pan.
Why do I have low oil pressure?: This is commonly caused by increased clearances within the engine, i.e., worn engine. It could also be caused by low oil levels and by the oil pump ingesting air, or because the by-pass valve is not functioning properly.
Why do I have high oil pressure?: This can be caused by using the wrong viscosity (thickness) of motor oil in your engine, or because the by-pass valve is not functioning properly. Another common cause is tight engine clearances, i.e., new engine.
Is it better to replace only the timing chain and sprockets or should all the timing components, such as tensioners, guides pulleys, etc., be replaced?: If a complete set is offered for your engine application, it is strongly recommended to use the complete set.
Why does my oil pressure drop at high rpm’s?: The oil pump screen could be sucking air, or oil is not returning to the pan properly. Every situation is different, because every engine, and every engine builder, is different. These are some of the more common occurrences we experience.
Will a hi-volume oil pump eliminate my low oil pressure?: No, a hi-volume oil pump is not a band-aid.
How should I break in my camshaft?: Start the engine, after it starts, check for oil pressure and bring the rpm to 1500-2000. If the pressure is good, run the engine at this rpm range for 20 minutes. After this run-in period, final adjustments can be made and the engine put in service.
When replacing my stock cam with a Melling Torque Cam, what ignition timing settings do I use?: Always set your base timing to factory specifications for the break-in period. After the cam is broken in using an advance meter timing light, check your total mechanical and vacuum timing advance. Most engines can only use 34 to 38 degrees in total advance, depending on fuel and compression.
Do the marks on the pump spur gears have any significance? (i.e. timing): No, they are manufacturer's marks that normally both face the same direction.
Can I block the filter bypass on my engine?: Many performance engine builders do. It is strictly a matter of choice. Some filters can create excessive resistance to the pump.
Will the use of an oil cooler substantially restrict oil flow to my engine?: Carefully research the purchase of an oil cooler. A high quality cooler with matched lines will only create a minor flow restriction.