This pump is not meant to support engines with variable valve timing and displacement on demand. The flow rate of the has been reduced to match the lubrication needs of aftermarket blocks with priority main oiling systems. This eliminates the need to modify a stock pump to reduce its output. Its reduced displacement requires less power to operate.
All the features that make our performance wet sump oil pumps best in class have been utilized in the new low volume pump. Skip to the beginning of the images gallery. Features and Benefits 8. Specifications Drop Ship Item No. Reference Documents. Reviews 1. Write Your Own Review. Overall 1 star 2 stars 3 stars 4 stars 5 stars. Add your photo. I recommend this product. Submit Review. Related Products. Check items to add to the cart or select all. Out of stock. Contact us. All rights reserved. These pumps offer several advantages over a stock replacement pump that you might want to consider.
The and are both CNC machined and hard anodized for additional wear resistance. Both pumps come with a CNC-machined and phosphate coating on the pump cover and use countersunk screws in the cover for improved timing cover clearance.
This is helpful if you are using a dual-row timing set that requires the pump be spaced 0. Higher volume pumps have found a place in some LS engines, especially high mileage aluminum block engines that suffer from excessive lifter bore clearance.
GM originally produced these engines with slightly wider lifter bore clearances to allow these engines to start and run in extreme cold climates. This slightly increased lifter bore clearance creates a significant internal hydraulic leak that effectively increases the pump volume of oil. Often it is much easier to add a slightly higher volume pump than to refurbish the lifter bores with aftermarket bushings.
For these engines, Melling offers an oil pump that puts out 33 percent more volume than the Melling While the LS engine architecture offers multiple advantages over the old Gen I small-block, it also has its assembly technique peculiarities.
One aspect that can cause serious performance issues is the seemingly insignificant O-ring seal placed around the oil pump inlet tube as it fits inside the oil pump. There is quite a bit of confusion surrounding this simple little seal since there are two different seals that can be used. Melling has created an easy-to-follow guide that references the correct O-ring seal to be used with the three different pickup tubes.
The point to remember is the different O-rings are necessary because of various tube designs, not because of changes to the oil pumps. The reason this seal is so important is that with the oil pump at the front of the engine and the sump at the rear, this necessitates a inch long tube from the pickup to the pump. If the seal is cut or does not make a complete seal, air is introduced into the inlet side of the pump and pump performance suffers dramatically.
Once the correct seal is in place and the engine is assembled, the oil pump and oil filter need to be pre-filled to help the engine make immediate oil pressure when it starts. This is important anytime the oil pump has been replaced or if the engine is new. Melling offers a quick two-minute video that explains how this works.
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