Re: Insert bearings
Technology has greatly aided the poured bearing process. Infrared temperature guns has taken the 'art' out of tinning and babbit pour temperatures.
The hydrodynamic principle requires adequate oil feed on the un loaded side of the bearing gravity or pressure. Insert bearings perform best when pressurized,it helps keep them clean and cool and will reduce the incident of failure with an A engine.Vendors love insert bearings,its straight forward work,line bore the block,snap in the bearings,ship the job.The risks are way less than the pouring process risk..and when they do fail its well out of warranty..win-win from a business perspective.What amuses me is how they sell inserts by propagating myths about poured bearings..they wont handle compression,they don't last,you name it.No bearing tolerates the torsional vibration inherent in a model a engine,Ford Engineering identified the issue in development..throwing in inserts and a counterbalanced crankshaft doesn't exempt you from that hard and fast rule.
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