06-02-2014, 11:46 AM
Different strokes for different folks as always 
Petrols are completely different engines. They generally spin 50% faster so are much stronger by original design.
Remember the bulk of bottom end forces in a diesel engine are torque related at normal operating speeds, with not much expectation for high inertial loads from high rpm. Usually after 4000rpm the torque is much much lower in a diesel.
Throw in high rpm AND higher torque via tuning, AND some age, AND then also some resonance. Hmmmm.
It might be fine on 90% of cars, but then another customer might have a solid lower engine mount and get a resonant feedback loop and smash their gearbox, or split their crank?!
For me it's not something you can easily test for, and it's potentially a complete show-stopper... all for a novelty effect that has no performance benefits that I've heard.
At that point it's not really tuning for performance any more, and that is where my interest ends.
Dave
Petrols are completely different engines. They generally spin 50% faster so are much stronger by original design.
Remember the bulk of bottom end forces in a diesel engine are torque related at normal operating speeds, with not much expectation for high inertial loads from high rpm. Usually after 4000rpm the torque is much much lower in a diesel.
Throw in high rpm AND higher torque via tuning, AND some age, AND then also some resonance. Hmmmm.
It might be fine on 90% of cars, but then another customer might have a solid lower engine mount and get a resonant feedback loop and smash their gearbox, or split their crank?!
For me it's not something you can easily test for, and it's potentially a complete show-stopper... all for a novelty effect that has no performance benefits that I've heard.
At that point it's not really tuning for performance any more, and that is where my interest ends.
Dave