#4 cylinder is almost gone in my 02 wrx. Looking at my options and the ej257 block swap has really caught my attention. What modifications need done for a reliable swap? If you can list out the mods required that would be a big help.
Yep, they bolt right up but due to the different bore size the 2.0 heads are made for, more knock prone. There sre companies (equilibrium comes to mind) that will match the combustion chamber to the larger bore of the new block.
When you guys mention knock, are you talking detonation or rod knock? The detonation issue would probably be from higher compression and boost levels. From what I've read the CR will be around 8.7. This would limit boost to around 17-18psi safely on 93 octane. Reliability should come from the tune itself though.
CR is ~9:1. And detonation is more common on these engines due to the mismatched combustion chambers causing areas of higher heat than they would with matched heads. It's a physical problem, not a tuning one. And boost is not limited to what you're thinking with a stock turbo.
When you guys mention knock, are you talking detonation or rod knock? The detonation issue would probably be from higher compression and boost levels. From what I've read the CR will be around 8.7. This would limit boost to around 17-18psi safely on 93 octane. Reliability should come from the tune itself though.
Ill be staying away from the 2.5L. The cars a daily and i dont care about making more power than stock. I was only looking at the 2.5 as an alternative if it wasnt that much more expensive but it is for what i use the car for. A brand new Subaru Shortblock is $2300 from my local dealer. Thats including a gasket kit. I think i can just put new OEM pistons in my current block and get the machine work done and come out way a head of what a new shortblock costs. Ill never be going for more power with this car.
$2300, damn I'd be looking else where. I bought one for a car and it was only $1800 shipped. Maybe prices have gone up, but if your just looking to keep it stock and drive it then I'd just go that route. Trust me when I say that for machine work, replacement pistons gasket kit and various odds and ends it's cheaper to go with a factory short block, plus you get a warranty.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Subaru WRX Forum
329.6K posts
38.3K members
Since 2002
We're a forum community dedicated to the Subaru WRX. Come join the discussion on performance modifications, accessories, turbo upgrades, maintenance and more!