Meticulous Mouse For The Mule
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Since the aluminum block "moves around" and "grows" a lot as with an increase in temperature, the tolerances like those for the main bearings are tightened to reduce the amount of oil flopping off the crank. For an aluminum block, Urban sets the main bearing clearances at .0018 inch, versus .0025 inch on an iron block (this is on everything but the rear main). On the rear, he runs .0025 inch versus .0030 inch with iron. Urban told me, "Stielow, you'll shift this thing at 7,000 rpm, and I want a little oil on the thrust bearing to prevent a problem." We've brought him back problems before! Here's a tech tip: Urban always line hones and measures the mains with the oil pump bolted to the main cap. "It's amazing how much the torque of the oil pump stud will pull the main out of round," he says, "So I always bolt up a dummy oil pump before doing that machine work." View Related Article
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Ford Mustang Research
Consider the Ford Mustang for your next new car, and browse reviews featuring information on test drives, comparisons, options and features. The 2010 Mustang has fuel economy of 20 mpg, and comes with comparable warranty coverage to other vehicles in its class. Other similar vehicles are the Chevy Camaro and the Pontica GTO.
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