Don't know for the turbo size but the B engine if you keep your EGT between 600F and 1100F and your water temps below 100C. The psi between 0-10psi.. The B engine is strong enough to take it.
I rebuild 2 engine and see the difference between the B, 3B and newer motor.
3B is hard as hell, B engine is hard and strong and new engine is 3 or 4 time smaller in every part. 1 Connecting rod of the B engine is 3 times the size of a new connecting rod from other diesel motor. So if you put a turbo on a B your engine will do maybe 400 000km against 600 000km if you don't have a turbo. So: this mean the turbo shortens engine life?
By the way... I read a lot on piston skirt. The only effect is to cool down the piston.. not for oiling it. Thats scrap your oil faster because the piston is really hot ... and need more oil change to keep it good. Thats good for a race car that need lot of power in not long time. If you keep your EGT between what I tell, the pistons skirt is good.. but not as good as everybody tell us. You really need it when you run 35'' tire in mud and your feet on the floor. By the way.. the piston skirt run only at a certain psi that I don't know because of the lack of oil at low rpm that all B serie engine have
If you have a B engine, you can machined piston oill skirter. Do you know where to drill to fix the oil squirter? i supposed it must meet engine's oil galleys..
