Gtr Block

[N I B]

Yes a factory standard issue block.

[Guest acxacx]

so your saying a factory standard 05U will do the job?

[N I B]

Ive seen to many N1s with cracks down the bore but never seen one factory block split a bore tho i have seen cracks from head stud holes.

Go a new block and prep that and cryo treat it.Dont know if it works or not but i havent seen and broken treated parts.

[Swiper the Fox]

so your saying a factory standard 05U will do the job?

Yes

[Tommyk]

Well its up to you. You can go with your standard block, but I dont like that idea. Nissan ran endurance tests on 05u and 24u blocks. They found 9/10 standard blocks cracked after 2000kms of testing on 05u blocks. 0/10 24u n1 blocks cracked after this endurance testing.

I dont care what you say, but have a look at this. It should convince you otherwise.

A comparison with a gt and a 05u block. I know I certainly would not go for an 05u if i was running 86.5 or 87mm bore, or even running big power through it.

And 'Doughboy's' block is gone, and will be in my capable hands on thursday

[Tommyk]

Just a bit more

Consider running an 86.5mm bore. That gives you just under 5mm wall thickness on either side of the piston, with an n1 block. Although I dont know the wall thickness of a standard block, based on the pictures, they look to be about half that of the gt block. Assuming that, you only have a 3mm wall thickness with a 86 mm bore and less than that if you go 86.5mm. Carrying around 100hp per cylinder, i wouldnt trust it to last terribly long with less than 3mm of wall thickness at those sorts of cylinder pressures.

Food for thought I suppose. Does anyone know the standard block wall thickness ???

[Mik]

Just a bit more

Consider running an 86.5mm bore. That gives you just under 5mm wall thickness on either side of the piston, with an n1 block. Although I dont know the wall thickness of a standard block, based on the pictures, they look to be about half that of the gt block. Assuming that, you only have a 3mm wall thickness with a 86 mm bore and less than that if you go 86.5mm. Carrying around 100hp per cylinder, i wouldnt trust it to last terribly long with less than 3mm of wall thickness at those sorts of cylinder pressures.

Food for thought I suppose. Does anyone know the standard block wall thickness ???

Another interesting point is that Nissan had a recall on 05U blocks due to them leaking coolant between 3&4 above the oil boss.

But every casting is different, so I guess with blocks, it is the luck of the draw.

But, ask Darren from Just Jap how long an 05U block lasts him in his Targa car, and he wouldn't be running more than about 500hp.

[wrxhoon]

Tommy amd Mik you both been reading to many books, just listen to the pro above , dont worry about Nismo, how would they know what they are doing ?

Well i dont know about you Tommy but i know Mik hasn'tand still doesn't read or buy any books!!

[Beer Baron]

Well its up to you. You can go with your standard block, but I dont like that idea. Nissan ran endurance tests on 05u and 24u blocks. They found 9/10 standard blocks cracked after 2000kms of testing on 05u blocks. 0/10 24u n1 blocks cracked after this endurance testing.

I dont care what you say, but have a look at this. It should convince you otherwise.

A comparison with a gt and a 05u block. I know I certainly would not go for an 05u if i was running 86.5 or 87mm bore, or even running big power through it.

And 'Doughboy's' block is gone, and will be in my capable hands on thursday

but that pic says that n1 block is 96 mm (which with a 87mm bore leave a cylinger wall thickness of 4.5mm) and GT is 98mm (which with same bore leaves 5.5mm). what is the thickness of the standard 32? and if the GT one is superior why are you getting the N1 block? i thought you were going crate engine?

[Tommyk]

Change of plans Richard. Its a secret

Not sure about stock block thickness

[Swiper the Fox]

Hahaha...the dynamic duo are at it again.

Never doubted the N1 product or even the GT500 block....point was....is it needed for his application....and from his response....i think not.

acxacx i hope this information provided has been useful in your decision...the 05U product is not as bad as some people may lead you to believe....yes the N1 item is better....but in most applications its overkill.

[AdamsR33]

No they don't

Umm yes they do!

http://www.justjap.com/engines.htm

[Mik]

Umm yes they do!

http://www.justjap.com/engines.htm

In that case, I'll have 5 please. Can they help me out?? I think not...

[Swiper the Fox]

Umm yes they do!

http://www.justjap.com/engines.htm

yeah i may as well order one too....while their hot!!

[Tommyk]

Ok well lets see

Ive been trying to source an n1 block for the last month. In Australia, nissan parramatta has 1 block. they want 3700 for it. TRADE PRICE

Justjap dont have stock. Give them a call. Hi octane have no stock. Sorry I believe they have a gt block for 6k. no thanks

I called my contacts in japan. Nissan japan has NO STOCK. Go on. Give them a call. You will find there are none. Nissan has no plans to recommit to further production. There are some specialised workshops in japan that have a small amount of inventory left, but they sell these as parts of complete motors. You may be able to find a 2nd hand on yahoo japan, or at a 2nd hand parts shop. My japanese parts broker has quoted me 200,000 yen plus shipping for a brand new n1 and this is after extensive searching and there is apparently a 4 month wait invovled ? So they definitely are around, if you have the money and time and patience.

At the end of the day, Paul believes you dont need one, so dont get one. When you start losing coolant and start to wonder why, come back to this thread. Im not saying it will happen or it wont happen, but im not a mechanic. When I do my build, I dont want to pull out my motor again for another 100,000 kms. Paul on the other hand can pull out his engine, refit a new block with pistons rods and crank. New bearings, new rings, new headgasket and new bolts. Oh and the pleasure of running it in again. I dont have the mechanical ability to do that. NOR do i want to be spending any more money after. Do it once, do it right.

Believe what you want to believe. Pauls running 460awkw through his block and its fine. You should listen to him

[Swiper the Fox]

Believe what you want to believe. Pauls running 460awkw through his block and its fine. You should listen to him

Just trying to help the guy make an informed decision....not trying to sway him either way.

Chicken little said the sky would fall too.....

The way you guys are going on you'd swear everybody without an N1 or GT500 block has a timebomb under their hood.

BTW..... the best AWKW figure we have seen is only 443.

Good luck with your build

Edited April 19, 2006 by DiRTgarage