Jump to content
SAU Community

Ohmagoshbang!

Moanie

By Moanie,
in New South Wales

 Share

Recommended Posts

wilch Grand Master

wilch

Posted
Posted

OUCH!

and oi Chris.. You might provide the cable ties, but remember I'm the one that does the tieing! :(

oh, and I'm with thomas RB26!

This is a VERY complex discussion that can go on for ages, and will surely piss the rest of the whores off if we discuss it in this thread, but in a nutshell, all things being equal, a normal stroke RB26 is better for big power on street fuel than using an RB30 crank for the following reasons-

*The piston speed is lower at the same revs

*There is less side thrust exerted on the bores by the pistons, due to less conrod angular/side motion (less heat/friction)

*The Piston spends more time in the dwell state at TDC and BDC

*The Bore/Stroke ratio is much better (over-square engines like to rev harder)

Which helps, briefly, with the following

*Keeps frictional losses down (engine lasts longer, makes power more easily)

*Helps secondary balance

*Optimises manifold air speed at high revs

And blahdy, blahdy, blah. [/end rant]

Nissan could have made the engine 3L if they wanted to, but they didn't.

P.s 2JZ's and RB30's both have around 6800rpm limits from the factory, which is the same piston speed as an RB26 at 8000rpm.

  • Replies 240
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

DoughBoy Veteran

DoughBoy

Posted
Posted

Ouch... how much damage to the head (esp the combustion chamber on 6)?

Pretty respectable effort, haven't seen something that smashed for a long time!

Edit - that quote from R32R at the top of the page is wrong, very very wrong. I think he's got things crossed up.

Abo Bob Grand Master

Abo Bob

Posted
Posted
Ouch... how much damage to the head (esp the combustion chamber on 6)?

Pretty respectable effort, haven't seen something that smashed for a long time!

Edit - that quote from R32R at the top of the page is wrong, very very wrong. I think he's got things crossed up.

That's what I thought too but I'm glad somebody more knowledgable than me said it first.

wilch Grand Master

wilch

Posted
Posted

But but but, if RB30 bottom ends are so good, then why can't I get a crate engine with an RB30 bottom end shipped from Japan? (innocent look)

No one will do it for me! They all say something along the lines of, "Are you stupid?" (innocent look)

(...stupid for asking them to build it, not stupid for asking them to build one and send it)

Seriously though, I'd like to hear someone that is all for RB30's tell me why they're better. I have no idea.

..uhm..so as not to hijack mona's thread, this is for your benefit too moonie :huh::(

GoldZilla Grand Master

GoldZilla

Posted
Posted
i've heard RB20DE
It will be sweet when it has the CA18DE in there, should be an animal,ooops I've said too much.........

Personally, I'd be going for an L16 and turbo, blowing through a decent sized carbie of some sort - 45mm Weber, Dellorto or SU, side-draught of course... :huh:

im sure u can cable tie it back together.. no biggy
Bit of gaffa tape and she'll be all good again..

Ahhh, cable ties and gaffa/electrical tape - the drift/drag/circuit racer's and mechanic's best friend! :(

Seriously though, that is some heavy duty damage. :rofl: Mona, you should keep the parts and display them somehow for memories. Ahhh, the good times!

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


×
×
  • Create New...