You went from 30 weight hot to 50 weight hot which is an improvement but not twice the viscosity. And, as you have experienced, doubling the viscosity does not double the pressure drop from the pump to the crankcase. As long as there is an open flow path for a gear pump increasing the viscosity does increase pressure drop from pump to bearing exit but only so much as the viscosity affects the pressure drop, which is not one to one and is not linear.
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Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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