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Munda's Rb26 Rebuild

MUNDA

By MUNDA,
in Engines & Forced Induction

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MUNDA Explorer

MUNDA

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Posted (edited)

MUNDA's RB26 Rebuild

Bottom End Parts

Block

Standard RB26 Bottom (acid dipped, machined)

Crank

TOMEI Forged Full-Counter Crankshaft

Connecting Rods

TOMEI Forged H-BEAM 21mm PIN

Pistons

TOMEI Forged Pistons 87.0 Bore 21mm PIN

Piston Rings

TOMEI Forged Piston Rings

Conrod Bearing

NISMO Conrod Bearings

Crank Bearing

NISMO Crank Bearings

Oil Pump

NISMO Oil Pump

Gaskit Kit

TOMEI Gasket Kit 87.0 Bore 1.8mm Thickness

Timing Belt

TOMEI Strengthened Timing Belt

Bolts/Studs

TOMEI Cam & TOMEI Crank Cap Studs

Top End Parts

Head

Standard RB26 Head

Cams

JUN High Lift Camshafts

Injectors

SARD Injectors 1.10 msec

Coil Pack

SPLITFIRE Direct Ignition

Fuel Rail

HKS Fuel Rail

Fuel Pump

TOMEI Fuel Pump & Regulator

Alright, now I believe that I have figured most of the main parts and things out, all I need to figure out are the turbos (I want to do twin turbo), wastegate (external or internal), manifold and intake pipes. What I want to know is, what turbos will be able to push what HP on this motor, money should not be a problem for me. I know I will need a upgraded driveshaft, tranny, the works, I will get that all done. I am looking for somewhere in the 600-700 rwhp range.

Some other questions that I had are what sort of lift and duration do the camshafts need? Should I keep the standard 86.5mm bore or up it by 0.5mm to go 87.0mm bore, and whats the difference between the two, which is more stable? How thick should the head gasket be?

Also, if I am missing any other main parts please point that out to me, I am slowing learning, and just want to get my homework done before I go and purchase any parts.

Thanks a lot guys, im looking forward to hear from you,

MUNDA

Edited by MUNDA
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https://www.sau.com.au/forums/topic/259070-mundas-rb26-rebuild/
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The Dan Grand Master

The Dan

Posted
Posted

To start with, you are going to meed an N1 block to go safely to 87mm. You can still do it on the standard RB26 block but I have heard of people who have had issues doing it reliably. The extra 0.5mm is not going to make you any more hp.

The turbos you'll need are 707160-5's and you need to wring their necks to get them there, or you can go for the 707160-10's and do it a little more easily.

The head gasket doesn't need to be 1.8mm, in fact no more than 1.5mm should be ok. It really depends on how much hp you want to make on pump fuel, if you want to make 700hp on pulp then maybe stay with the 1.8mm gasket and put up with the lower compression.

For the camshafts, you won't need anything bigger than 260 x 9.15mm. Standard camshafts on a GTR are pretty good and you could probably leave them, but there are still advantages to be had by upgrading.

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