This page is going to be a detailed instruction guide for building a RB34 using the SPOOL billet 95mm stroker crank. The trial motor's bottom end is assembled and waiting for the R34 NEO cylinder head to come back from reconditioning.
The trial RB34 stroker motor will be identical to the RB30DET that was in the SPOOL IMPORTS R33 4 Door SpoolImportsR33.asp - apart from the 95mm stroker crank. This way I can make a true ( apples for apples ) comparison between a RB30/25 and a RB34/25.
So basically everything in the SPOOL IMPORTS R33 is going to be used with the new RB34:
RB34 SPECS:
RB30 Block - bored 40thou
CP Forged pistons
Decked
SPOOL Billet main caps and girdle
Cometic headgasket
ARP Head studs and mains studs
SPOOL 95mm Stroker crank
SPOOL I Beam custom conrods - L19 Bolts
ACL race series bearings
Jun oil pump - crank snout modified to suit
R34 NEO head - HKS 272 / 9.35 cams, Performance Valve Springs, ported and polished by JHH performance
Garrett T04Z turbo 0.96 ex housing
Sard 850cc injectors
6 Boost manifold - HKS 60mm wastegate
Greddy Plenum - VH45 90mm throttle body
OS Giken Twin Plate Clutch
3 x 044 Bosch Fuel Pumps
3.5 inch dump, exhaust and catalytic convertor
This way we can overlay the 2 dyno charts and make a comparison between the differences in torque, where the two engines make boost, full boost , full power and revs.
Due to the huge stroke, the block needs to be clareanced to allow the conrods to rotate without fouling on the cylinder block. Leaving 50 thou of clearance allows for stretch at high rpm.
The bottom of each bore has to be clearanced to give that little bit extra room for the I beam conrods.
Annular groove is cut into each main bearing seat to allow for better oil distribution using the multi hole GTR ( RB26 ) main bearings
GTR main bearing smeared with assembly lube - notice the 4 extra holes ( with the recessed groove ) in the GTR bearings compared to just the one hole in the RB30 main bearings.
Block threads are cleaned using a tap - this ensures all threads are clean and free from damage and corrosion. Oil restrictors are fitted to the block to prevent over oiling - a common problem with RB engines. Inside main tunnel is measured with bearings fitted to check bearing to crank main clearance Crankshaft main journal is measured to ascertain bearing clearance
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Oil restrictors are fitted to the block to prevent over oiling - a common problem with RB engines.
Inside main tunnel is measured with bearings fitted to check bearing to crank main clearance
Crankshaft main journal is measured to ascertain bearing clearance
