N1 Block

[aaronjod]

Hey guys,

Just wondering what are the advantages of using a N1 block over std? How do you differentiate the two?

[XKLABA]

the N1 block is a bit stronger/stiffer due to extra ribbing and things, std block has 05U in the casting where the N1 has 24U

[Piggaz]

N1 has thicker cylinder walls.

A standard block will have 05U casted into the side of it, the N1 will have 24U.

[marksuxass]

Doing some research for the actual advantages of 24U vs O5U, I contacted Endless-r in japan. They claim that the older rb26 blocks (used in the late model r32's) have the same nickel content as a 24U N1 items. They also claim that from years of being used it has "heat treated/strengthened" the block even further. The majority of the builds they do will have an older 05U block as the base rather then the 24U item.

Have seen plenty of 05U blocks crack (my old workshop had shelves upon shelves of them) but the majority of them where from earlier model GTR's (long nosed r32, r33 and r34). Usualy go between the coreplugs under the turbos, and in worse cases they will pop the core plug out. Also pretty common around the starter motor too. Never seen a 24U block crack. For me 24U block would be a must if your gonna chase more power/rape it.

[iplen]

That's 2 (almost 3) conflicting bits of info; 05U after years are as strong as 24U, 05U out of early RB26 powered cars break, then all 3 RB26 powered generations are listed as early RBs .. Just sayin'

[Piggaz]

That's 2 (almost 3) conflicting bits of info; 05U after years are as strong as 24U, 05U out of early RB26 powered cars break, then all 3 RB26 powered generations are listed as early RBs .. Just sayin'

The previous owner of my car split a standard (97 GTR) block within 1000 kms after putting a 77.7 mm crank in it. It got screwed back together with a RRR block (in 2006) and no issues with cracking blocks.

[GTR_JOEY]

The previous owner of my car split a standard (97 GTR) block within 1000 kms after putting a 77.7 mm crank in it. It got screwed back together with a RRR block (in 2006) and no issues with cracking blocks.

Yes yes, we re all very impressed by your $10,000 block, go to bed ya drunk

Edited August 5, 2012 by GTR_JOEY

[levinboy]

Yes yes, we re all very impressed by your $10,000 block, go to bed ya drunk

Hahaha zing

[GTR_NUTZ]

I've heard similar about the old 32 blocks getting stronger with age. Would still like to see proof of that. This might be the reason muscle car builders prefer seasoned blocks or weathered blocks. Look at the RB30, +25 years old and still going strong, look at the power these blocks can produce no worries.

I just bought a N1 block yesterday cheap cheap too :-) it's done 25000ks then spun a bearing :-/

[wedge_r34gtr]

The thermal cycling of a block essential acts as a heat treatment cycle, thus stress releiving the microstructure. Thus the older the block, generally the more heat cycles it's been through and thus the less residual stress, hence a stronger block.

In addition to the above, I have heard (not sure where sorry) the first 500 or so r32 rb26 blocks were made to the same spec(or just chemistry) as the n1 blocks, just not marked the same.

If I could get hold of some fragments of various blocks agross the years, I could properly get a spectro and microstructure analsys done through work.

Edited August 5, 2012 by wedge_r34gtr

[GTRsean]

I have just started getting blocks partial grout filled to lessen chance of cracking. 05U ones especially.

I do this on RB26 builds now....

[GTR_NUTZ]

What's the difference between 24U and 25U stamped blocks?

[GTRsean]

You mean 05U...

05U : standard block- strong-cheap

24U : N1 block- stronger-pricey

RRR : GT block- strongest-damn expensive

[GTR_NUTZ]

Just checked out Wikipedia (I know it's not a reliable sorce of intel) but they say N1 block is stamped with 24U or 25U.

No 25U?

Edit: it appears you can not rely on Wikipedia.

[GTRsean]

I'll fix wiki....thanks for the info

[marksuxass]

That's 2 (almost 3) conflicting bits of info; 05U after years are as strong as 24U, 05U out of early RB26 powered cars break, then all 3 RB26 powered generations are listed as early RBs .. Just sayin'

Replace the word early with late/vice versa

Edited August 6, 2012 by marksuxass