Quote:
Originally Posted by Dimman
The EJ20 he mentioned is a Subaru motor.
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But the F-series are much like the EJ's for anyone who hasn't seen the insides of them.
Quote:
Originally Posted by slow_frs
Hmm odd I've seen more subaru engines have piston ring failures than Toyota think about the design the pistons are sideways, gravity is constantly pulling the piston down on its side mix that with the stroking motion and it's like running something across a file over time the bottom side of the piston will flatten its just physics
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You really think 1G of force downward is a concern to a piston's life cycle?
The piston ring failures largely come from the tight rings from the factory. The hyper eutectic castings are also brittle in failure, so a good detonation and failure yet again. It's all compromises that the EJ25 had to make to fit a decent rod ratio with a short deck and meet cold start emissions...the piston got the short end with it's shortened compression height.
Boxers all have a bit of an oily start up and some smoke from them sitting in their oil whenever shut off though. Unlike most engines, the oil puddles at the bottom of the cylinder and will collect in the rings, which under start up goes out the tailpipe, all the more reason for the tight PTW, ringlands and ring gaps to pass EPA and Euro testing from the factory.
As for Accelerated, it'll be interested to see where this goes!
-Micah