1. it's billet
2. it only lasts a few hours, and then scrapped
Yes, 1.25" can be done, just not an on-the-shelf piston.
Not exactly on topic, but: given that an L6 doesn't need percentage balancing?
Does anyone know what the counterweights actually weigh?
Santucci cuts quite a bit off which helps accel, but is the stock weight more or less than the rotating total?
Journal size: (sorry if this is already obvious) pump pressure does not pressurize the crank against the bearing shell for support.
Actual local oil pressure (at the journal) is far, far higher than the 50, 60 psi from the pump.
This is developed by the relative speeds of the journal itself against the bearing in f/s (not the RPM or journal size), bearing width (to the closest leak), oil viscosity and temperature, balanced against clearance (leakage rate).
All pump pressure does is "fill in the hole" and refresh the oil in the annular space at least as fast as the leak expels it (which increases with pressure and load).
This is why low-speed engines have very large journals - so the rotational speed sufficient for the load is high with a modest pump and low leaks.
A very high speed motor can use the same rotational speed, but accomplished with a small journal and high RPM.
(deep breath)
What I don't know (stop laughing!): do these factors (RPM × journal circumference = "skin" speed in f/s) contribute equally? Meaning: if you reduce the journal by 10% and keep the RPM do you lose 10% of the load capacity? If you increase RPM by 10% and reduce journal size by 10% do they self-cancel?
