SUPER Crank Scrapers for IH 304, 345-392  Crank scrapers are a very inexpensive and simple -- but effective -- way to improve the performance of your engine! A crank scraper is a piece of metal that disrupts the oil-filled windage cloud that forms around the spinning crankshaft and rods. The scraper actively removes excess oil from that cloud and returns it to the pan. Crank scrapers have been in use for at least 40 years and are considered to be a well proven technology by professional automotive engineers. Scrapers come in a number of different designs and are present in many stock engines. Yes, they really do work. In the mid-1980s Chrysler and Mobil Oil did joint research on the windage losses for the 2.2 engine in the Shelby Charger. After designing and installing a crank scraper type windage tray they recovered 7 hp at 6000 rpm and 9 hp when using Mobil-1 synthetic oil. Ishihara-Johnson crank scrapers are constructed from 12 gauge mild steel (about .10” or 2.5mm thick) and include installation instructions. The scrapers are installed between the oil pan and engine block or along the main bearing caps.
What are some of the benefits?
· Less rotating mass for the engine to accelerate because of the removed oil
· Less loss of power because of excessive drag caused by the windage cloud
· Helps avoid oil starvation by keeping the oil in the pan during hard braking and
turning as well as during off-road driving
· Helps to cool critical engine parts by quickly returning heated oil to the sump
· Helps to prevent the cylinder walls from being overloaded with oil
· Can help with fuel efficiency