ENGINE BLOCK COMPONENTS
【Short block VR38 4.3L STEP Pro】
A short block that includes the VR38 4.3L Capacity Upgrade kit.
It further strengthened the crankshaft and crankshaft main bearing cap for assuming the circuit driving.
・Expected use scene: Circuit
・Assumed torque: ~ 1500 N∙m
The assumed torque came from the in-house test data. We do not guarantee the use of the product without any damage.
Please note that the allowable torque may vary depending on the specifications of a vehicle, road surface conditions, driving conditions, travel distances, and so on when using the product on the actual vehicle.
- The crank for STEP Pro changed the material to nitride steel and treated the surface with ion nitriding to improve durability by enhancing the surface hardness and hardened layer.
- Expand the R-corner of the fillet weld in the crankpin to improve the torsion strength.
- Prevents fretting by extending the crank nose 10 mm longer.
- HKS original main stud bolt with thicker screws is used.
- Enhance the strength by changing the material of #2 and #3 journals to Chromium-molybdenum steel.
- Line boring for securing the roundness of the journal.
- The main bearing and connecting rod bearing are highly selected through various tests.
- The crank damper pulley (provided) developed only for VR43 engines reduces torsion vibrations.
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HKS crank damper pulley only for VR4.3L
(Cooperatively developed with ATI PERFORMANCE PRODUCTS) -
Expand the R-corner of the fillet weld in the crankpin to improve the torsional rigidity of the crankshaft
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Connecting rod bearing specially for VR4.3L
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The billet crankshaft achieved reduced weight, improved response, and less torsion by using a high-efficient counterweight.
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The bearing caps in #2 and #3 of the journal changed to Chromium-molybdenum steel to enhance the quality of the material. The line boring improved the accuracy of the roundness.
Specifications
HKS 4.3L | Stock | |
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Bore | 95.5mm | 95.5mm |
Stroke | 99.0mm | 88.4mm |
Compression Ratio (t=0.8) | 8.6 | 9.0 |
Allowable Rotation Speed | 7,400rpm | 7,000rpm |
Displacement | 4,255cc | 3,799cc |
SHORT BLOCK VR38 4.3L STEP Pro
Block Modifications |
#2, #3 Chromium-molybdenum steel made cap |
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Provides the Clearance for the crank contacting section |
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Thicker main bearing screws | |
Enlarged bore and counter boring in the ladder beam bearing cap |
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Main bearing journal line boring | |
Honing | |
Main Bolt | HKS M12 stud bolt (625+) |
Piston | HKS billet, Molybdenum coating |
Connecting Rod | HKS H-beam (Clearance for fillet weld portion) |
Crankshaft | Nitriding steel billet (Tungsten crankshaft weight) |
Ion Plasma Nitrided | |
Expanded R-corner of the fillet weld in the crankpin |
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Extending the crank nose for attaching crank damper pulley. |
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Main Bearing | Made by ACL |
Connecting Rod Bearing |
Factory, fine particle peening (WPC treatment) |
Crank Pulley | HKS product for VR43 only |