OS Giken – RB31 Race Engine
The ultimate upgrade for your RB26, these complete pre-assembled bottom-end kits are rated to handle power outputs up to 1400hp. The RB31 features 88mm stroke and can also be supplied with 87mm pistons for 3.2 litre capacity. Normal combustion chamber volume comes to 10cc, but specially shaped pistons can also be custom-ordered. The RB31 is built using an N1 block, with the same specially-designed spacer and liner arrangement as the RB30, with an oil restrictor and piston cooler jets already fitted.OS Giken 8-bolt clutch required to suit this engine.
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