[Short block RB26 3.0L STEP3]
Newly developed 2-piece piston realizes increased stroke and connecting rod length while maintaining block height.
- The 3.0L dedicated crank is a full counter machined from nitriding steel, and ion nitriding treatment has increased the surface hardness to the limit and improved fatigue strength.
- In preparation for higher torque, a dedicated I-section connecting rod is used to improve buckling strength by 36%. In addition, we also adopted a φ22 thicker piston pin.
- As a countermeasure against the heat generated by the high power output, the valve guide and seat materials have been changed, and a sodium-filled EX valve and a piston with a cooling channel have been adopted.
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Dedicated full counter crank
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Dedicated I-beam connecting rod with 36% higher buckling strength and 6mm longer shaft distance
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Machined 2-piece piston
By making the piston two pieces and raising the pin position, it became possible to reduce the compression height. This made it possible to lengthen the connecting rod and increase the length of the rod without increasing the deck.
In addition, the piston is super lightweight at 313g and has a cooling channel for oil cooling.
Specifications
| HKS 3.0L | genuine | |
|---|---|---|
| boa | 86.5mm | 86.0mm |
| stroke | 84.0mm | 73.7mm |
| Compression ratio (t=0.84) | 8.7 | - |
| Allowable rotation speed | 9,000rpm | 7,600 rpm |
| Displacement | 2,996cc | 2,568cc |
SHORT BLOCK RB26 3.0L STEP3
| Block (24U) processing details |
Surface grinding (parallelism correction with the main journal), water hole processing, deck surface hole chamfering (crack countermeasures), edge removal processing at the bottom end of the cylinder, boring |
|---|---|
| piston | HKS 2 piece machined |
| piston pin | Φ22 reinforced product |
| connecting rod | HKS I cross section Center distance: 127.5mm |
| Crankshaft | Nitriding steel machined full counter ion nitriding treatment |
| main bearing | ACLs |
| connecting rod bearing | ACLs |