Wyvern
Well-Known Member
I'd wager the Avenger piston is lighter weight.This is the Avenger, Phantom and MS380 pistons. All are 51.8mm diameter, avenger is 40.5mm height while phantom and ms380 are 39.3 height.
What is interesting is the other two have sipes for oil on the wrist pin where the Avenger does not.
I wonder how much compression the Avenger loses/blow by vs. a standard 2 ring design.
Also with less ring, less heat from the piston is going into the cylinder wall, but it's also less friction, so it may be a wash.
I'd love to get a phantom to compare, I do not believe the Avenger is an entire HP shy of a Phantom, but I also know, even with more surface area, this engine still generates gobs of heat and is still a "problem ”