Crankshafts
Your crankshaft goes from 0 to 3000 rpm in about two seconds. When the air fuel mixture expands in the cylinder head it forces the piston and connecting rod down into the crankshaft. At 8,000 rpm it does this 4,000 times a minute. The crankshaft only appears to be rigid. It isn't. Anytime a load is applied to a part the part deflects. All parts ultimately act as a spring in response to a load. In the case of the crankshaft that movement will be very small but it will be intense. It will also happen very quickly. When the engineers designed your engine they did a lot of calculations and they created a crankshaft that could withstand all of these forces. Now decades later you’re changing everything. You’re trying to get more horsepower out of your old engine, which blows up all those original calculations. You’re applying a lot more stress than the designer ever envisioned. And, you’re asking a fifty-year old part to do this. Maintenance Schedule: Tom Lieb, founder of Scat Cra...