N1 Oil Pump - Epic Fail

[Duncan]

just another state laws of physics difference....just like NSW has a SBS problem

[R31Nismoid]

hahaha I wasn't gonna bring that one up - Although the baron is on holidays so he cant get exicted about it

[rad100]

well funds arent permitting me getting a nitto pump right now.

i have a built 25, ross metal jacket, jun collar.

whats a good way to protect the N1 pump?

car is grip raced.

cheers

[Duncan]

don't tunnel bore the block, stay off the limiter, get the internals balanced.

[rad100]

engine was fully balanced, grub screwed etc.

safe to keep revs ~7500rpm?

[Nee-san]

had 2 N1 Oil pumps thus far, first one was attached to an engine that was dropped off a stand smashing a big crack in it, went strong for ages, never lost pressure once. replaced it once i found it obviously (long story) new one is going awesome.

[R31Nismoid]

engine was fully balanced, grub screwed etc.

safe to keep revs ~7500rpm?

Mine see's 8000rpm very regularly. 7.5 won't be a problem, just don't slap the limiter.

All 3 RB motors i've had built so far, all N1 pumps, all 8000rpm - no problems. I just don't limiter

[Moodles2]

If the limiter is set low to like 7200rpm, is it the ignition cut (i believe that's the method the stock ecu/nistune) itself that puts the stress on the pump gears?

[rad100]

yeh i wont be out to sit on limiter.

its more of exiting a corner and losing traction.

[Nee-san]

Mine see's 8000rpm very regularly. 7.5 won't be a problem, just don't slap the limiter.

All 3 RB motors i've had built so far, all N1 pumps, all 8000rpm - no problems. I just don't limiter

LOL

[Legionnaire]

If the limiter is set low to like 7200rpm, is it the ignition cut (i believe that's the method the stock ecu/nistune) itself that puts the stress on the pump gears?

Speaking of stock ecu, I believe it uses fuel cut. When certain amount of revs is reached, fuel gets cut and crank starts to decelerate until it reaches so called "fuel recovery threshold", RPM point at which ecu resumes fuelling, and crank accelerates again. So if you're flat on throttle by that time, i.e. sitting on the limiter, this process repeats and crank speeds up and slows down in rapid succession, hitting pump drive planes and wearing them. The (bad) solution for this is to set limit level 300-500rpm higher than rpm at which you shift to reduce your chances of hitting the limiter.

[STATUS]

don't tunnel bore the block

What issues have you come across with tunnel bored rb's?

[R31Nismoid]

If the limiter is set low to like 7200rpm, is it the ignition cut (i believe that's the method the stock ecu/nistune) itself that puts the stress on the pump gears?

Yep.

Doesn't matter where you hit it, it's still not a good idea.

Obviously if things are turning 1000rpm less, there is less overall stress etc - but not really worth the chance.

I remember on guy a while back - using a BeeR limiter thing and smashed a pump even @ lower rpm/shooting flames!

[Duncan]

just a theory trent. tunnel boring moves the crank off centre compared to the oil pump.

[STATUS]

just a theory trent. tunnel boring moves the crank off centre compared to the oil pump.

OK, no stress, was just making sure i hadnt overlooked something.

We actually tunnel bore all our engines so just wanted to know your experiences... bad or good.

[SECURITY]

does anyone know if a soft-cut is useful when running an N1?

[waxracing]

What you can do is to reduce the timing and add fuel up top. the engine will not hit a limiter but it will just lean over and stop making power.

You will then change gear. All good

the other solution is dont run an n1 pump

[bigmikespec]

the other solution is dont run an n1 pump

Don't understand why people won't spend an extra $500-$700 on a better pump rather than play oil pump roulette... I will build mine to last the hard time I want to give it not baby it because I am too much of a tight ass.

[Deano 1]

Don't understand why people won't spend an extra $500-$700 on a better pump rather than play oil pump roulette... I will build mine to last the hard time I want to give it not baby it because I am too much of a tight ass.

+1

[R31Nismoid]

Don't understand why people won't spend an extra $500-$700 on a better pump rather than play oil pump roulette... I will build mine to last the hard time I want to give it not baby it because I am too much of a tight ass.

No pump is safe from being destroyed if you limiter bash. Even Tomei's can be killed.

spending more is not necessarily 100% fail proof due to the pump design!