Description
Brand new, never used with ZERO miles STI Type RA / S209 engine long block assembly. This is a fully assembled bare long block EJ257. All it needs is your accessories transferred to this new engine. If you don’t want to transfer your accessories over, you may purchase an accessory kit from us that can come with the engine or pre-installed at our facility for extra. Just contact us for pricing.
What’s included:
- Brand new Type RA / S209 EJ257 Short Block 2.5L OEM 10103AD020
- Brand new Type RA / S209 N25 Cylinder Heads OEM 11039AC730, 11063AC010
- Brand new Type RA / S209 Head Gaskets OEM 11044AA910
- Brand new ARP 11mm Head Studs
- Brand new Cam Seals OEM 806742160
- Fully assembled by our SAP certified technician and torqued to spec
Warranty: 3 years or 36,000 miles, whichever comes first. Warranty is honored by Subaru of America. Your VIN must match the 10103AD020 part number. Engine must be installed by an ASE certified shop. Brand new OEM VF48 Turbo, oil cooler, oil pump, oil feed banjo bolts, avcs solenoids, and cam gears also must be installed for warranty purposes (must show proof of purchase or purchase directly from us.)
Shipping: This item will be shipping via freight. Price advertised is to a business address with a forklift or loading dock. You must have a business address with a forklift or loading dock in order to qualify for free shipping. If you do not have one, we can ship to your residential address, but it will cost roughly $150 to 350 extra (depending on where you are located) for the residential surcharge and liftgate service. Special note: This item is subject to a 5% cancellation fee. We are also unable to accommodate address changes on this particular item, so make sure you list the correct shipping address, otherwise a 5% cancellation charge will occur in we need to change the address.
The block is the same casting as the latest engines, numbered “705.” The crankshaft is the same nitrided, full-counterweight design found in previous EJ25s. Unfortunately, the crankshaft doesn’t have the additional oiling ports found in other special edition EJs. The bearings and clearances thus far have been within typical late-model EJ257 specs as well.
Type RA Piston Differences
Upon initial impression, the Type RA and STI piston are both machined cast pistons. The dish volume measured out very close to each other and the valve reliefs are the same depth. Unfortunately the Type RA does not have forged pistons as some had hoped for, although we haven’t ruled out the possibility that the Type RA pistons are made from a different alloy that is less susceptible to fracturing (more ductile), as they are supplied by Hitachi rather than Aisin. The crown on the Type RA pistons appears to be 1 – 2mm thicker than the STI piston as well, which is hard to discern from the picture.
From the side profile you can see a few differences. First, the coating at the top ringland is extended to the crown on the earlier STI pistons. This is likely due to manufacturing differences (less tooling / different tooling) rather than any specific performance difference. Second, there is considerably more material supporting the wrist pin on the Type RA piston.
Compression height, ring position, and other dimensions appear to be the same. Meaning, there are no changes to the ringlands in position or thickness. Top ring gaps were 0.010″, 0.010″, 0.011″, 0.011″. and lower ring gaps were 0.014″, 0.014″, 0.014″ 0.015″.
From the bottom you can see how much material was added to the wrist pin area (in red) as well as the reduction in the large center support (in green). The Type RA design is superior for piston rigidity since it reduces the amount of cantilever, as well as giving better support to the wrist pin itself.
Earlier STI pistons weigh in at 414 grams while the Type RA pistons weigh 424 grams. The extra 10 grams of weight is not a big deal when you consider the improvements made to the piston design. For comparison, forged pistons for the EJ257 typically weigh in the 370 – 400 gram range depending on bore size and design. The wrist pins weighed the same for both motors.
Type RA Con Rod Differences
The Type RA rods are identical to the GR STI’s rods as far as my eyes tell me. Not a big surprise considering the rods are definitely not the weak link in the motor. There are some differences in the late model rods compared to the earlier EJ257 rods and the EJ207 rods, notably the closed channel on the big end’s internal bore and the lack of a perpendicular reinforcement rib .
No visual differences between the GR STI rod, and in fact, the 2018 STI and Type RA rods share the same part number.
Part Number:
Type RA Engine Assembly (Shortblock)
10103AD020
Warranty Disclaimer: Subaru of America will only warranty parts installed by a CERTIFIED Subaru Dealership. The part being installed must also match the vehicle VIN. IE If you install an STi block in a WRX at your friends shop, do not expect a warranty claim to come through if it explodes! Please use your best judgement.
