SP63 Top Dog 2.5L Short Block | Ecoboost
SP63 Top Dog 2.5L Short Block | Ecoboost
The rod/stroke ratio affects several engine dynamics, including piston speed and acceleration, piston dwell at top dead center and bottom dead center, piston side loads, cylinder loading and bearing loads. Many of these elements play roles in engine aspiration, combustion and wear. Generally, a lower ratio means a high rod angle, creating greater potential for accelerated wear to cylinder walls, pistons and rings. A low enough ratio, due to the severity of its rod angle, can drive a piston right into the cylinder wall. Higher ratio engines, on the other hand, don't have the same friction concerns, but compromise in other areas.
Air does not fill the intake ports with the same velocity, and there is less demand for the ports to flow as well since there is more time to fill and scavenge the cylinder (we discuss this phenomenon later). This typically means stagnant airflow at low revs and weaker torque.In a stroked motor, the piston ultimately reaches greater speeds to cover the additional stroke. The speed makes intake, compression and exhaust strokes more turbulent and, consequently, more powerful. It also comes with its price in component wear, something to consider when looking into parts that increase stroke that why we use custom and forged components.
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Product Includes
- SP63 Custom 89mm Pistons
- SP63 Custom H Tuff Rods
- Sleeves
- Custom 2.5L Crankshaft
- King Rod Bearings
- ACL Main bearings
- ARP2000 Main Studs
- BSD Kit
- Keyed Crankshaft
- Rear Main Seal
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Video
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Machine Shop Services
Your used block will go through our entire machine shop process to ensure it meets the highest specifications. We start off with a hot tank cleaning service to bring it back to factory clean and then inspect it for any cracks. The block is then bored and plate honed using a torque plate. Final clearances are checked and the block goes through a final cleaning to make sure there is no debris left over from the machining process.
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Crank Keying
The Ford Ecoboost engine relies on 2 friction washers between the crank pulley and sprockets to help keep the motor in time. This works very well for stock power levels and even mild big turbo setups. Once you reach the 450whp mark, slipping timing can become a problem. This can lead to catastrophic engine failure amounting to thousands of dollars in repairs. We have developed a square keyway which locks the crank pulley and sprockets from slipping on the crankshaft and eliminates the need to replace the friction washers and crank bolt every time it is loosened.
*Please note the crank pulley and sprockets are not included and must be purchased separately*
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Shipping
All blocks have a fixed shipping. Our short blocks shipping is $450. Price is to the contiguous USA only.