quote:It would show up as a higher ppm of wear metals in the UOA, but take into consideration that because it's coming off more parts, the wear level in comparison to a 4 cylinder probably evens out. IOW, 8ppm of iron in an 8 cylinder engine is much like 4ppm of iron in a 4 cylinder (if they are of similar metal construction that is) When I had my 98 Formula with the 6 speed transmission (with it's .50 overdrive!!) and it's stock 3.42 rear end, the rpms at 60mph were only 1300! Even when I modified it later with a 4.10 rear end, it only revved at just under 1600rpm at 60mph. My current Formula has a 3.23 rear end and an automatic trans with a .70 overdrive, so it revs at about 1900rpm at 60mph.
Originally posted by mkosem: One thing you may want to consider tho..... 8 cylinder engines have more moving(and thus wearing due to friction) parts in them. 8 cilinders, double the number of cam journals, double the number of crank journals, etc. wouldn't that contribute to additional wear? --Matt
quote:This is an old wive's tale that dates back to the old Ford flathead V-8's. ALL engine configurations have sideways thrust on the pistons, it has nothing to do with the angle of the cylinder, only the direction of the engine rotation. Do Subarus and Porsches wear out their cylinders on the bottom? Does jacking the back end of your car up make it go faster since it's always going downhill?
Originally posted by JohnBrowning: The thrust side of a V/W engine cuases abnormal wear and interferes with ring sealing after 50,000-60,000 miles. This might be offset some by today by almost all engines being tilted for packageing though.
quote:Although this is true in a "static" sense ..there tend to be distinct differences. The "V" configuration tends to have a shorter rod length to stroke ratio. That is the amount of reactive thrust tends to be "less". The longer the rod to stroke ratio ..the higher the torque. This is due to less angular deflection ...and, hence, less lateral thrust.
ALL engine configurations have sideways thrust on the pistons