I"ve got a 5.0 liter Ford engine I put together and had to have it balanced. I went from stock TRW forged pistons to Mahle forged pistons. The Mahles were about 60 grams lighter per piston, but they were a matched set and weighed within one gram of each other. I even verified it because the engine builder I used at that time said as long as the Mahles each weighed the same it won"t make any difference in the balance of the motor. I put it back together and above 2200 rpm"s it would shake you out of the car. I changed flywheels, pressure plate, harmonic balancer..nothing changed it. I tore it back down and took the rotating assembly to my current machine shop. He laughed and said with that kind of weight difference of course it would vibrate. He balanced it for me and I put it back together and it is smooth as silk now. It madea believer out of me on balancing. Which OEM replacement pistons have to be within 10% of the original pistons weight or they aren"t supposed to be sold as OEM replacements.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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