[DavidBoren]

So, I'm pretty sold on the idea of running oil squirters and an LS9 (or similar) oil pump. But in researching oil squirters, I got to thinking, which can be dangerous for someone who doesn't know much.

Now, in relation to increased stroke causing an increase in heat/ friction...

Would the decreased circumference of a smaller bore translate into less friction (heat) being generated for the same stroke with a larger diameter bore/ piston?

We discussed the decreased surface area of the smaller bore being less efficient at transferring heat to the cooling system, and we talked about how increasing stroke will generate more heat. But it was never covered if increasing bore diameter has comparable increase in friction heat.

An undersquare motor would have smaller pistons, think smaller piston ring surface area, traveling a longer distance.

An oversquare engine would have more piston ring surface area traveling a shorter distance.

With both engines in question being of equal displacement, both spinning to the same redline, does one really generate more or less heat than the other?

Does less surface area traveling further generate more friction than more surface area traveling less?

More specifically, would MY proposed undersquare six liter, with its 3.78" bore and 4" stroke, generate LESS friction heat than, say, the LS2 with its 4.00" bore and a shorter 3.6" stroke? The 4.00" pistons have almost four more square inches of surface area interacting with the cylinder walls!

Using a relatively generic 1.2mm, 1.5mm, and 2.5mm ring set for both, the 3.78" piston has 61.78 square inches of surface interaction, per piston. The 4" bore piston, with the same ring set, has 65.36 square inches of piston ring surface, per piston.

Math:
3.78" x 25.4 = 96.01mm
Pi x 96.01mm = 301.63mm
301.63mm x (1.2mm + 1.5mm + 2.5mm) = 1568.48sq/mm
1568.48sq/mm / 25.4 = 61.78sq/in