Clevite MB2036H1U(5) Main Bearing (Chrysler NHRA Prostock Engines Individual)


Individual Main BearingsIndividual Main BearingsVarious types of main bearing grooving have been used over theyears. We are steadily asked what difference grooving makes.First, its crucial to remember the fact 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 more than one grooves. As engine and bearing technologydeveloped, bearing grooving was once got rid of from brand new lower mainbearings. The result’s in a thicker film of oil for the shaft toride on. This offers a better safety margin and improved bearinglife. Upper main shells, which see lower lots than the lowers,have retained a groove to offer theconnecting rods with oil.So to develop the most productive imaginable 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 productive overall design.Even as a fairly shorter groove of 140 provides a marginalgain, the various benefit is to the upper shell, which doesnt needimprovement. However, extending the groove into the lowerhalf, while 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 FilmPress


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