Wednesday, February 12, 2014
Rotation Direction for a Pontiac 350 Engine
Pontiac has always been GMs excitement division, and its V-8 production strategy was one reason its stayed that way for so long. Unlike many other divisions that had large- and small-block engine families, Pontiac had only one engine that spanned from 265 all the way up to 455 cubic inches. Smaller-displacement engines like the 350 were oft-overlooked cult classics, mostly because of serious junkyard upgrades in the form of higher flowing heads, intakes and cam packages for the 428 and 455.
Rotation Direction
Most V-8 and V-6 engines use common-journal crankshafts, meaning that the connecting rods from two opposing cylinders ride on one arm of the crankshaft. Such is the case here: Pistons 1 and 2 share a crankshaft arm, as do 3 and 4, 5 and 6, and 7 and 8. Knowing this, and the fact that the even numbers are on the passenger side of the block, you can figure out the direction of rotation from the engines firing order.
The Pontiacs firing order is 2-1-8-4-3-6-5-7. Notice that in this order, you have a couple of pairs: 2-1 and 6-5. Since you know that those cylinders share a common arm, you can deduce that the crankshaft hits the passenger side first, and then the driver side. Theore, the crankshaft rotation is clockwise when looking at the engine from the front, counterclockwise when looking at it from the rear. Inside the distributor, the rotor spins counterclockwise.
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