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At What Point Do I Need An N1 Block?

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R31Nismoid Grand Master

R31Nismoid

Posted
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

I'd imagine there would be quite a number of big RPM launches behind the car that split the block around that point :)

luke20t Collaborator

luke20t

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.

i dont know of many r34's but i have heard of N1 r33 with smiliar problems.

why not spend a little extra for better peace of mind.

rob82 standard r32 oil pumps are weak as

rob82 Mentor

rob82

Posted
Posted
i dont know of many r34's but i have heard of N1 r33 with smiliar problems.

why not spend a little extra for better peace of mind.

rob82 standard r32 oil pumps are weak as

Are you saying that because the r32 have the small oil pump drive or because you geniunely know that the pumps are weak? So R33 GTR oil pumps are fine?

Brockas Proficient

Brockas

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

Well, now you have.

R34 N1 motor, straight from Nissan, 15,000kms on the clock, cracked crank journal in the N1 pump.

Still have the pump sitting at home if you want pictures.

STR8E180 Proficient

STR8E180

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.

im sure the N1 oil pump is good, i neva said it wasnt

all im saying is if ur going to rebuild ur engine and u have ur engine in piece's ur beter of spending that little bit extra and getting some thing better

this is coming from some one who runs a custom machined CNC stainless billet oil pump which has been heat treated

alot of research went into this oil pump the 1st one machined up had some problems with the valve staying closed but with more researching and testing we got it right

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

I haven't heard of ONE pump failure among anyone here in Vic i know using them.

Being most of them DONT do big RPM launches and mainly track work or street... all of them have been totally fine.

Some of the users that posted here over the years about their failures were as Paul said... people with built "some" parts, and untouched 15yr old others.

And also a fair number at the same time were doing big launches @ the drags etc.

I've never seen a legit reason among many cars here to say a N1 isnt upto the task for moderate power ups.

Only people posting here without any idea of what thier build included or how they drive/treat the car mostly

Sydneykid Grand Master

Sydneykid

Posted
Posted
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.

I agree with Paul, we must have used over 30 N1 oil pumps over the years and not had 1 single falilue. Why not us? Carefull balancing of the engine and a decent harmonic balancer are the only answers I have as well.

Cheers

Gary

RPMGTR Community Regular

RPMGTR

Posted
Posted

You can break ANY oil pump in an RB if you try hard enough!

We have broken them all... Jun, Tomei, HKS, N1, and standard ones too.

99.5% of the time it's due to the loose nut behind the wheel.

If you continually smash it on to the rev-limiter and it will break the pump.

If you are unsure why it broke (as no-one ever thrashes their new engines!), have a look at the drive faces inside the gear.

Tell-tale sign is wear on the driveside AND non driveside of the gear....thats what the rev-limiter/launch control does!

cheers

Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted
You can break ANY oil pump in an RB if you try hard enough!

We have broken them all... Jun, Tomei, HKS, N1, and standard ones too.

99.5% of the time it's due to the loose nut behind the wheel.

If you continually smash it on to the rev-limiter and it will break the pump.

If you are unsure why it broke (as no-one ever thrashes their new engines!), have a look at the drive faces inside the gear.

Tell-tale sign is wear on the driveside AND non driveside of the gear....thats what the rev-limiter/launch control does!

cheers

thats how we finally broke ours...3 years of flogging it to death was not a problem...it was when we changed the set-up to a ignition cut launch limiter...it broke on the 2nd pass.

Brockas Proficient

Brockas

Posted
Posted
I agree with Paul, we must have used over 30 N1 oil pumps over the years and not had 1 single falilue. Why not us? Carefull balancing of the engine and a decent harmonic balancer are the only answers I have as well.

Cheers

Gary

http://www.skylinesaustralia.com/forums/Fa...view=getnewpost

Antimatter Experienced

Antimatter

Posted
  • Author
Posted

for the record the roundy roundy bits went outside because the bore filled with water.

I will post a pic tomorrow of where the water came from...

:(

lol worst or most?

btw I don't think a n1 block is able to keep roundy roundy bits inside when they let go any more than a standard one is :P

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