Clevite MB3829VXL(25) Main Bearing Set (Custom Nascar Performance 2.017in Journal)


Clevite Main BearingsMain Bearing SetVarious kinds of main bearing grooving have been used over theyears. We are incessantly asked what difference grooving makes.First, its very important to keep in mind that bearings rely on afilm of oil to keep them separated from the shaft surface. This oilfilm is developed by shaft rotation. as the shaft rotates it pullsoil into the loaded area of the bearing and rides up in this filmmuch like a tire hydroplaning on wet pavement. Grooving in abearing acts like tread in a tire to get a divorce the oil film. Whileyou want your tires to grip the street, you dont want your bearingsto grip the shaft.The principle reason for having any grooving in a main bearing isto provide oil to the connecting rods. Without rod bearings tofeed, a simple oil hole would be sufficient to lubricate a mainbearing. Many early engines used full grooved bearings and someeven used a couple of grooves. As engine and bearing technologydeveloped, bearing grooving was once got rid of from up to date lower mainbearings. The result’s in a thicker film of oil for the shaft toride on. This gives a better safety margin and improved bearinglife. Upper main shells, which see lower quite a bit than the lowers,have retained a groove to provide theconnecting rods with oil.To be able to develop the most efficient conceivable main bearing designsfor performance engines, weve investigated the effects of mainbearing grooving on bearing performance. The graphs at the nextpage illustrate that a simple 180 groove within the upper main shellis still the most efficient overall design.Whilst a fairly shorter groove of 140 provides a marginalgain, a few of the benefit is to the upper shell, which doesnt needimprovement. Then again, extending the groove into the lowerhalf, at the same time as little as 20 at every parting line (220 in total),takes away from upper bearing performance without providing anybenefit to the lower half. Its also interesting to notice that asgroove length increases so do horsepower loss and Peak Oil FilmPressure which i


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