Team GTR RB26/30 Engine Build Progress

After 2 years of drag racing at Santa Pod it was time to upgrade the 2.6 litre displacement for a 3 litre engine. The engine build is in progress, spec below slideshow

Block Preparation:

• Core plugs removed and block soda blasted then hot washed after machining work.
• Bored +0.5 mm.
• Block decked by 10 thou (not because it had an issue, but to ensure the finish was suitable for the head gasket).
• Block modified to accept RB26 head bolts (larger than Rb25/30)
• Block and bore scrubbed by hand with cleaning solution until completely clean.
• Tomei 0.5 mm oil restrictors fitted in head oil feed, centre feed blocked.
• Drilled and tapped to accept twin cam style tensioners

Crank Preparation:

• All journals polished.
• Dynamically balanced, with front pulley, clutch and flywheel.
• Nose of crank machined for interference fit of JUN oil pump drive collar.
• Genuine JUN crank collar fitted and grub screwed.

Specification:

Bottom end

• Rb30 Block bored +0.5mm
• Balanced crank
• ACL Race Main bearings (all clearances checked with plastigauge)
• ARP Main bearing cap bolts
• Spool forged conrods, balanced end to end.
• ACL Race Big End bearings.
• ARP rod bolts
• Tomei oil restrictor
• JUN drive collar
• JUN oil pump
• Rips Racing AWD Sump adaptor
• Trust sump extension
• Genuine N1 water pump + genuine Nissan water pump gasket
• New core plugs (from Nissan)
• New RB25 Front pulley bolt
• New thermostat
• Polished thermostat housing
• New RB26 Pilot bearing installed

Head

• Good condition RB26 head as a base.
• 1.6 mm Cosworth multi layer steel head gasket
• HKS Cam gears
• Tomei High lift inlet camshaft IN280°- 11.50mm
• Tomei High lift exhast camshaft EX280°- 11.50mm
• Tomei Solid Valve lifters
• Tomei Valve Springs
• Tomei Titanium Valve Spring Retainers
• Supertech oversized valves 1mm
• Supertech Bronze valve guides
• Spool head drain kit
• ARP RB26 Cylinder heap stud and nut kit
• Head skimmed to ensure flat and suitable for head gasket
• Head ported and polished by Chesman Motorsport (over £1500 worth of work), this is a very special head.
• New Nissan valve stem oil seals
• Genuine Nissan gaskets and seals (i.e Crank, cam, water pump)
• Genuine Nissan cambelt tensioners
• Modified lower cambelt cover (extended to suit RB30)
• Squish pad removed on exhaust side as per NISMO
• Combustion chambers smoothed and balanced

Planned work

Once the engine is back at Team GTR HQ we'll be adding some extras to the engine build.

• A very special Turbo, using HKS T51 Kai casing and custom 'top secret' internals
• HKS 11mm fuel rail
• Injector dynamics 2000cc fuel injectors
• Life Racing F88 ECU
• Direct port Nitrous
• JUN inlet plenum
• OS Giken 1-5 speed transmission
• OS Giken Triple plate clutch