VEMS Subaru EJ25 Block

The EJ25 engine has been plagued with ringland issues for years. We finally have a solution to fix the issue. Now, this isn’t meant to replace a forged engine, but more so another option for the daily driver or pump gas cars out there. We have successfully tested this over the course of the last two and a half years in cars making 300HP-500HP on 93 octane and haven’t seen any failures.   You hear all sorts of things as to why they crack and the most common thing you hear is detonation. While this can be true, we do not see that as the number one cause. The number one cause is heat. Which comes in the form of torque, boost, fuel type, lambda targets, etc. What we need to really pay attention to is the in-cylinder temps that specifically come with using pump gas. Compared to ethanol, pump gas will have much higher in-cylinder temps which transfers heat into the top of the piston. This is important to recognize because almost all OEM cast pistons are hypereutectic which will allow more of