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At What Point Do I Need An N1 Block?

Antimatter
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Antimatter Experienced

Antimatter

Posted
Posted (edited)

Guys - as always, I enjoy the banter so.....

I am building a RB26 with the usuals:

Wiseco Forged pistons

Eagle Rods

R33 Crank

Tomei Head Gasket

N1 water pump

N1 oil pump

ACL Bearings

Stock Reco Head

Adjustable cam gears

Standard 05U Block (to be bored to first O/S / 86.5)

Turbos - still deciding -5's or -7's (or equivelent)

(would love a set of AX53B70's - anybody got some?)

Blah blah etc.

Will have the fuel and ecu to support plenty of power.

Anyway... question is:

At what point (power lever, type of usage etc) should I be considering a N1 block?

Your opinion matters ;)

What do you guys think?

Edited by Antimatter
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Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted
Not at those power levels ;)

Well above 400, 450 even

the fastest drag skyline in this country makes over 1200hp

our car is producing over 900hp

both run STD 05U Nissan blocks

N1's have a lot of wank factor in my opinion.

Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted (edited)
So I can make a 400kw on a standard block? is there any "special" prep for that sort of power? I.e that grouting / cement I hear about.

you can "hardbloc" it as i have done to a few...

but a correctly set-up engine that is properly balanced will go a long way to saving your block.

apoligies for the double post...

Hi Ash ;)

Edited by DiRTgarage
Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted
i personally would pick a tomei or JUN oil pump over a N1 oil pump

ur rebuilding the engine so u may as well spend abit more and get some thing stronger

N1 oil pumps are just fine on a street engine as long as 8000rpm is not exceeded too often and a decent balancer is used.

Piggaz Grand Master

Piggaz

Posted
Posted

Well my car (who was owned by Mik before me) cracked his stock block at 370 KW at the rears with a Tomei stroker. However this was a Series 3 R33 and from what i can gather these blocks were quite porous

STR8E180 Proficient

STR8E180

Posted
Posted
N1 oil pumps are just fine on a street engine as long as 8000rpm is not exceeded too often and a decent balancer is used.

i know a few people who have been threw more then 1 or 2 N1 oil pumps B4 going tomei oil pump

these are street cars that dont see over 8000rpm

Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted (edited)
i know a few people who have been threw more then 1 or 2 N1 oil pumps B4 going tomei oil pump

these are street cars that dont see over 8000rpm

and probably were wearing 13-15 year old rubber balancers on them that were doing little more than helping the belts go round on the front of the engine.

So many engines rebuilt with dodgy balancers slapped back on them without a thought.

I raced for over 3 years with an N1 at over 8500rpm not a problem. Engine was built by me and properly balanced with a new harmonic balancer fitted.

They are not indestructable but if engine is properly built and ran correctly they survive fine in a street application.

Yes the Tomei pumps are good...out of the aftermarket the Tomei and JUN are definately the pick of them.

Edited by DiRTgarage
Antimatter Experienced

Antimatter

Posted
  • Author
Posted

OK... so I am getting some thumbs down on my oil pump... ANYWAY

Looks like my block will put up with me screwing the guts out of a pair of -5's?

i wouldnt risk using a N1 oil pump, spend the extra on sumthin better for sure.
Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted (edited)
i wouldnt risk using a N1 oil pump, spend the extra on sumthin better for sure.

How many R34 N1 engines fracture oil pumps?...none that ive heard of...why not?

well balanced engine with good quality fresh balancer on the front.

its harmonic crank vibration that kills oil pumps...the higher the revs the worse the problem.

id spend the extra $600 on an ATI balancer and stick with your N1.

this is free advice from someone who has done a lot of work, testing and research on this very issue. At quite a bit of expense.

Edited by DiRTgarage
NYTSKY Grand Master

NYTSKY

Posted
Posted
How many R34 N1 engines fracture oil pumps?...none that ive heard of...why not?

well balanced engine with good quality fresh balancer on the front.

its harmonic crank vibration that kills oil pumps...the higher the revs the worse the problem.

id spend the extra $600 on an ATI balancer and stick with your N1.

this is free advice from someone who has done a lot of work, testing and research on this very issue. At quite a bit of expense.

Am i buying an ATI balancer now Paul? lol

Antimatter Experienced

Antimatter

Posted
  • Author
Posted

Maybe I will start a thread on oil pumps :(

Anyway - to look at my original question about the blocks.... what is it that hurts them?

I have a block that came out a car that would have not been making much more than 300kw. Block cracked between the waterjacket and the bore number 2, filled the bore with water (at revs), and ended with a piston sized hole in the side of the block....

It was a stock motor that was obviously leant on. What a way to go though... BOOM!

:P

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