ACM
20+ Year Contributor
- 679
- 56
- Dec 11, 2002
-
Jamaica Plain,
Massachusetts
The problem that occurs in 4G63Ts - including Evos - is that the oil stays in the head and doesn't drain down; on top of that, instead of the oil draining back into the pan, the oil climbs the wall of the block and just stays there. Given the second issue, I can see that excessive roll would encourage that even without race tyre levels of grip - just how extreme is the roll ? From guys who raced 1Gs, the opinion is that the 1G pan/pickup setup is inferior to the 2G/Evo - but that's heresay, I've only run one 1G motor (7 bolt) and promptly starved it immediately ! But I was already starving 2G motors every few events at that time, so as a data point it's little help.
The cure in autocross is to use the biggest AccuSump available and overfill the oil. This works for a/x because the car's never holds a turn longer than a few seconds, and then we swap direction and a lot of the oil gets back to the pan during that transition - but if you try hitting a skid pad you'll still starve the motor of oil, even with all the above mods. 17 seconds turning left could never happen in my car - it would be spitting bearings out no later that 10 seconds into it.
Autocrossers don't run the Moroso pan because it offers no more protection than the AccuSump, and locates all the extra weight on the front of the car, whereas with an AcuSump we can locate the extra weight of the oil and reservoir anywhere helpful, RR corner in my case. With your situation, my reaction would be to run both setups, but also to work on improving drainage back to the pan, if that's possible. Last century's methods of enlarging/improving drainage from the head, polishing the inner block walls and painting them with Glyptal may help with this, though if it's extreme roll-induced, maybe not so much. I might have some other ideas, but nothing's popping right now.
The cure in autocross is to use the biggest AccuSump available and overfill the oil. This works for a/x because the car's never holds a turn longer than a few seconds, and then we swap direction and a lot of the oil gets back to the pan during that transition - but if you try hitting a skid pad you'll still starve the motor of oil, even with all the above mods. 17 seconds turning left could never happen in my car - it would be spitting bearings out no later that 10 seconds into it.
Autocrossers don't run the Moroso pan because it offers no more protection than the AccuSump, and locates all the extra weight on the front of the car, whereas with an AcuSump we can locate the extra weight of the oil and reservoir anywhere helpful, RR corner in my case. With your situation, my reaction would be to run both setups, but also to work on improving drainage back to the pan, if that's possible. Last century's methods of enlarging/improving drainage from the head, polishing the inner block walls and painting them with Glyptal may help with this, though if it's extreme roll-induced, maybe not so much. I might have some other ideas, but nothing's popping right now.