Low oil pressure?

yellow rose said

I've broken enough parts to know for a fact that oil timing is what it is. It's been settled science for decades. Hell, I think it was settled between the wars. Maybe before.

As long as the hole in the main journal of the crank is lined up with the feed hole in the block at about 70 degrees after TDC it doesn't matter where that oil feed hole is located. It can be anywhere in the circle, within reason. You have to be able to drill the passage from the main out to the rod.

It's a constant flow system. Rod length makes ZERO difference.

I'm surprised more people don't know this. It's why Chrysler's, Buicks, Olds and Pontiacs don't oil very well at higher RPM's. Look at their oil timing.

Click to expand...

Agreed but it seems to me that the size of the hole in the bearing shell is much smaller than that counter bore in the bearing saddle.
If you slot the bearing shell as Sanborn does and Guitar jones does, you shift the degrees of rotation closer to that 70 degree position that you feel is ideal. The slotted bearing shell along with the counter bore
Extends the position where the crank oil passage can get pressurized oil. IMHO both these guys are doing this mod with apparent success.
I believe rightly or wrongly that this modification is adjusting the oil timing. Either my 69 340 block missed some machining operations back in 1969 or Chrysler made a running change and started adding those counter bores. We are way off topic in this thread. Lol