More on the Subaru build please!!!
Yes, more info on the billet block build please.
Sure!
The Subaru build is an engine for my 2008 STI. It is a 2.5L flat-4 engine. Most Subaru builds revolve around upgrading parts inside the factory case, and it is not common to actually upgrade the engine case. Just a few years ago a company in Australia started working on a complete billet aluminum EJ257 case. (they also make a billet VR38). It is machined from a two solid pieces of 6061, and it has significantly improved contours with much thicker material in many locations.
This case has the equivalent of a '4 bolt main' setup, as there is an extra set of fasteners to help with case clamping.
All of the threads are rolled instead of cut for extra strength. For those not familiar, that hole there is for the wrist pin to go in, as you install the wrist pins into the piston/rod after it is in the engine.
Internally, there is a Manley Crank, IAG/CP Pistons, Manley Rods, a custom IAG Steel O-Ring Head interface, and 14mm head studs.
The sleeves are Darton DDI2017 sleeves which use their Top Fuel material.
I am going to start out with a Precision 6870 using the ETS tubing and ETS 4” intercooler.
You can see the groove in the top of the sleeve. There is a steel ring that fits into that groove and is compressed into the head gasket.
The heads are Cosworth heads with Cosworth 274 cam, valves, springs, and Ti retainers.
I’m using IAG fuel rails, with Radium dampeners, Injector Dynamics 2000cc injectors, and my own custom fuel lines.
This is where I am right now, with the heads attached, the oil pump, pickup, and baffle installed, water pump installed, and some of the timing system install.
Today I need to check the valve/bucket lash, then finish up the cam cap install and get ready to do the timing belt.
It is a fun build, and I really like doing Subaru engines. They are super easy to assemble and have great cross chassis compatibility. This little guy should be somewhere in the 900whp range (so probably around 1000 crank hp), which isn’t bad for a 2.5L 4 cylinder. The car is around 3200lbs, so pretty light in contrast to my GTR.
Jeff