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What Parts To Buy For My Rb26 Engine Build?

kitto

By kitto,
in Engines & Forced Induction

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kitto Mentor

kitto

Posted
Posted

Hey everyone, i'll try and keep this short so its easy to read.

I'm building an RB26 for race use. Now i dont have unlimited cash for it, but i havn't really set out a budget yet either. But i'm looking to buy the best quality parts i can get without being rediculous...

What i want the engine to be able to do;

Power: 300 - 350kW

Power range: 3,000 - 8,500/9,000RPM, yes i want it to rev high!

Reliability and longevity

Response within that rev range.

Now i'm not interested in talking about turbos, manifolds or fuel systems at this point, just engine internal parts, block and head..

Basically what i'm asking for is your advice on what parts i should be getting, your personal opinion, value for money, have you heard of XX part failing and what happened etc etc. Just wanting some input so i can make up my mind and start purchasing.

I'll be after advice on;

Rods

Pistons

Rings

Bearings

ARP Studs will be used throughout...

Gaskets (mainly head gasket)

Oil pumps - I'm thinking Tomei

Harmonic balancer

Clutch - I'll need this for when the engine is being assembled...

Head components;

Cams

Valve springs

Valves

Valve guides/seats

Just throw us some feedback on what you thinks good guys.

I'm hoping to have ALL the long motor parts for $8k - $10k. Then there will be engine assembly, manifolds, turbo, fuel system, management, pipework etc costs on top of that.

My main goal is to make this engine last for a long time!

OMGGTR Mentor

OMGGTR

Posted
Posted

Lets see,

In a nutshell that power is attainable without forging... but if u wana boooosttttt ull need to start changing bits in order to get that power and still be safe

There is a kit on HighOctane that has everything you need for a forged build for 4600 i think its perfect for what you want as im geting the same one! :)

One of the main ones is the oil pump .. in a nutshell GO TOMEI lol ull thank god so much in the long run that u spent the extra moneys on that as oil issues is huge on the 26 also make sure u get that oil restrictor

Headgasket and all other gaskets in this kit are tomei so u have no dramas with quality ur option on what size u want

Now with that 8500 to 9000 rpm u want ur going to have to go sexy cams with double valvesprings i highly recommend you have a look at CAMTECH cams they have kits to suit the 26 and are far more advanced than ur off the shelf crap from hks and tomei as advertised durations are not correctly displayed these guys are the shit :)

let me know how it goes choosing !

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

10k is pretty restrictive for that RPM range.

I know you don't want to talk turbos etc, but that choice is quite critical in you decision.

The reason i say this is because for 300-350rwkw, all turbos that fit that power range do not need more than 7500rpm or there abouts. Hence aiming for 8500+ is kinda pointless and will add excessive cost when you simply don't need it :)

Also with regards to parts, any can be killed and there are is always a horror story. So that request in itself is hard to answer and it will more so come down to how well the motor is assembled and tuned over and above the specific brand.

r33_racer Grand Master

r33_racer

Posted
Posted

10k is pretty restrictive for that RPM range.

I know you don't want to talk turbos etc, but that choice is quite critical in you decision.

The reason i say this is because for 300-350rwkw, all turbos that fit that power range do not need more than 7500rpm or there abouts. Hence aiming for 8500+ is kinda pointless and will add excessive cost when you simply don't need it :)

Also with regards to parts, any can be killed and there are is always a horror story. So that request in itself is hard to answer and it will more so come down to how well the motor is assembled and tuned over and above the specific brand.

Bang on there!

Generally the lower you can keep your revs the longer everything will last.

kitto Mentor

kitto

Posted
  • Author
Posted

I know, i have thought of this. Small power output, needs a smaller turbo. Higher revs needs a larger turbo = more power. To get a 26 to rev to that, you'd a fairly large turbo so that it operates in its efficiency range.

I just love a high revving engine, its just bliss!

Tomei pump is pretty much a goer, yes i have looked at camtech cams before.

I will be running forged internals, even though stock Nissan items would cope, i want that piece of mind.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

It might be bliss to the ears but it's excruciating pain to the wallet and IMO 10k isn't going to be enough anyway.

I mean just between the clutch, oil pump, new crank & pistons you are already @ around 5.5k-6k - Shit gets expensive if you want more RPM, very expensive.

I get the feeling you are going towards:

330-340rwkw

As much response as possible

And we can forget 8500+ :teehee:

For 10k, with the bits you want... 8000rpm limit, 2.6l bottom end done, head rebuild - i reckon you won't have a cent left outta 10k

Plus its a race motor, going to have its balls rung each time it goes out. Makes sense to keep RPM lower if you don't really need it.

kitto Mentor

kitto

Posted
  • Author
Posted

I can see your point, and i agree with it. Probably wanting something that just isn't realistic. Yes i'm chasing around 350kW, as anything more just isn't going to be any use in an R31.

I did know it was going to be an impossible task to get an engine to rev high on a budget but ah well.

The more important factors are;

Reliability and longevity and response.

marksuxass Collaborator

marksuxass

Posted
Posted

Maybe look at getting a mild port done, remove the bumps in the exhaust port and polish, 80 grit the inlets and knife edge the splitter, polish combustion chambers and leave quench area (maybe just chamfer the edge on it). I ended up doing this to my head myself, just purchased a head porting kit of ebay, came up really good. As for the turbos -7s, -5s, even -9s? all depends on what you want out of your engine. Cams you dont really need to change, maybe just get adjustable cam gears and have them dialed in when tunning it? Could even use direct drop 260 degree 9.15mm in/ex but again all depends what you want out of your engine. Im actually going through a rebuild with mine atm and am way over the 10 grand mark!

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