My big bore RB22,6. Need help planning my setup

[Tomzern]

Hi!

 

So I bought a couple of RB's recently. First I bought one, which turned out to be in a worse state than I anticipated. I contacted the seller, and he had another RB20 which he called a "stroker". He kindly GAVE me this engine as well, so now I have two for the cheap price of one! 

The "stroker" engine is now opened for inspection, and what I found was 83mm forged pistons, stock crank and rods. An engine calculator translated this to 2,26L of displacement.

The head featured what I think is Tomei cams with adjustable Tomei pulleys. The cams are stamped "64 - 8.5" at the rear ends, and they both have a white T written on them. I believe this means they are 264's with 8.5mm lift. Can anyone verify this?

The big bore engine also came with a HKS dual plate clutch. The other one came with a single plate ACT clutch. Which one should I use on my engine? The car is a street car and I want a clutch that is not too harsh. 

As for the power output I am hoping to be able to run around 300rwkw, but in the start I will use the stock RB25 turbo that came with the other engine. 

 

I also wonder where I can find an 83mm bore MLS head gasket for my engine?

As for engine management system, I have a cheap AEM Series 2 PnP ECU on hand. Is this a good choice?

 

And oh, the engine is going into my 1970 Datsun 240Z, along with a stock RB20 tranny.

There will probably be more questions later, so I thought it was a good idea to collect them all in this thread

 

Best regards,

Tomzern

[WantGTR]

Scrap everything and buy an rb25

[Tomzern]

20 minutes ago, WantGTR said:

Scrap everything and buy an rb25

Not an option. Thanks for your help though?

 

[GeeDog]

12 hours ago, Tomzern said:

I am hoping to be able to run around 300rwkw,

 

12 hours ago, Tomzern said:

along with a stock RB20 tranny

This may be a problem.

[KiwiRS4T]

You really need the big box RB25 Gearbox as the RB20 one won't last long with 300kw. What box is in the Z?

[Tomzern]

I thought the gearbox might be to weak for those power figures myself?

What is the maximum safe HP/NM that the RB20 box can handle? 

In the beginning I will run this setup with a stock RB25 turbo, so the power output won't be that high. I am hoping the stock tranny will work with the initial setup.

If I decide to upgrade later, will the driveshaft fit the RB25 box as well?

The box that is in the Z now, is a much older 5-speed Z-box.

[KiwiRS4T]

Here's a source of gearbox information:

https://www.jdmjunkies.ch/wordpress/2016-06-07/240z-transmissions-manuals-swap-possibillities/