i thought the supra was a high performance engine.why doesn it have four bolt mains like a camaro?
first reason is that the main journals in the 2jz engine are absolutely massive.they are some of the biggest mains you’ll ever see in an automotive engine, so block flex is not an issue as it is with domestic blocks.second reason is that the 2jz crankshaft is already a precision balanced component with twelve counterweights.as such, it does not require extra restraint or externally balancers.third reason is that with the inline configuration of this engine there are seven main journals taking the load, not just five as there are with domestic v-8 engines.in summary, the box stock lower end of the 2jz engine is nearly indestructible and is capable of delivering well over 900 horsepower reliably to the rest of the powertrain.it was “designed” as a high performance engine, not modified to be one.
