Nismo N1 Block

[MR33]

well last night i cracked my block in cyclinder 3 right down the bore after making 688hp at the wheels without the NOS on not reved out, the block was a nismo N1 block which we just fitted in after cracking the std one, so looks like the nismo ones are not as strong after all, i was told today that u can get a stronger block called the group a block does anyone have any ideas where these can be bought from?

[GTRgeoff]

Maybe stop chasing the perfect block and make one using perfect bore cylinder liners.

Can't help with the Group A. Try some of the old Gibson people maybe.

Good effort though

[MR33]

Maybe stop chasing the perfect block and make one using perfect bore cylinder liners.

i was going to look into that too but has anyone done this before?

[GTRgeoff]

Maybe Sydneykid would know with a few race GTR's. Engines would be someting they'd be on top of.

[NXTIME]

Was anything done to the block to strengthen it at all or was it just a std N1 block?

great result with the HP figure.

[MR33]

it was a std nismo n1 block, but we have weigh the std gtr33 block and the nismo one and there is no difference in weight thats why its got me wondered if there any different, the most i have made is just over 800hp in all four wheels and she was holding.

[Duncan]

well certainly a liner can be stronger than the original cylinders

but was the block checked in the first place? was it brand new? dropped off a pallet on the way over?

[Gav]

it was a std nismo n1 block, but we have weigh the std gtr33 block and the nismo one and there is no difference in weight thats why its got me wondered if there any different, the most i have made is just over 800hp in all four wheels and she was holding.

<{POST_SNAPBACK}>

There is certainly a difference in price between the std (05U) and the N1(24U) blocks!

I thought that the N1 blocks had thicker wall castings (i.e. smaller water jacket galleries) - perhaps the additional metal is minimal in weight?

[Guest]

A few bare blocks for high hp GTR's were sourced for mates through Grahame at www.japanparts.com he knows all the different variants and what they are worth.

Send an email with exactly what you need ad he can reply with a price delivered to your door if needed.

[MR33]

thanks guys for your help, ill send him a email.

[Guest]

He has sourced things for the USA like 1990 300Z complete front ends made new buy Nissan and for me he has some 1987 Century badges coming and Toyota Japan are doing some new ones for us which delayed the bits by 3 weeks.

If Graham cant get the bit nobody can.

Edited September 18, 2005 by Guest

[Fitzpatrick Speed Works]

maybe on the new block if its drag race only grout fill it. On the a brand new rb30 we are building we are grout filling the block as well as running chomoly cylinder liners and a custom sump girdle, that lines the inside of the block and join the thin parts of the block to the girdle.

[Leewah]

Hmmm. Sounds a bit strange that yr cracking blocks like that.

I made 604awkw on a standard prepped block.

Blocks are pretty hard to come by these days considering their not being made anymore.

[MR33]

usally i make around 650hp without the NOS and this time when we where tuning it we played around with cam timing and found more power so it was going for 700 with out the NOS so maybe the nismo blocks arent as strong as everyone thinks they are. im only runing 87mm pistons so there not to big, i might have to look into cyl liners or the gt block which they claim its thicker again but double the price.

[Gav]

usally i make around 650hp without the NOS and this time when we where tuning it we played around with cam timing and found more power so it was going for 700 with out the NOS so maybe the nismo blocks arent as strong as everyone thinks they are. im only runing 87mm pistons so there not to big,  i might have to look into cyl liners or the gt block which they claim its thicker again but double the price.

<{POST_SNAPBACK}>

Just a question - the new N1 (or standard for that matter) blocks have an 86mm bore. Presumably retaining this bore size would improve strength?

[blk180]

N1 blocks are 87mm arnt they

[Duncan]

nope the are definately 86mm

[MR33]

there all 86mm blocks from nissan. even the gt block but nismo bore it out to 87mm

[Gav]

It's interesting that HKS 2.8L kit uses 87mm piston as standard. This is a very common drag (i.e. high hp) setup.

Perhaps retaining the 86mm bore doesn't afford a great deal of additional strength?

[Tosh]

a few things to clarify

NISMO DO NOT MAKE an N1 Block

NISSAN make the N1 block. It has a higher Nickel content than the Standard RB26 Block and is stronger.

NISMO just realeased their GT Block this year to co-incide(spelling??) with the release of the R34 GTR Z tune. It is the same block used in the GT500 Race Cars.

Gav, increasing the bore size helps you increase the displacement in the engine. Hence why the HKS 2.8L Kit uses 87mm Pistons.

Retaining the original bore size or only going to 86.5mm pistons aids in developing fantastic engine response (not something that is overly focused on in drag setups). Also going to an 87mm bore rasies concerns about the overall strength of the block. It's fine if you run a drag car that gets re-built often but for a street car that need to last, it's an unnecessary risk IMHO.