Henrik

iTrader: (5)

What are the benefits of a nitrided STI crank over the normal non nitrided crank in a WRX (2001+)?

Henrik

iTrader: (5)

Oh what a rookie mistake, please move to gen tech mods

chrisdicko

iTrader: (21)

They aren't nitrided in the STI are they??

The benefit is it hardens the surface, to reduce scoring if there is any slight contamination in the oil I think.

TonyBurns

iTrader: (3)

The benefits is that this has better oil feed than the normal STI crank (its a JDM twin scroll crank only, not fitted to any other market car).

Tony

daz1968

iTrader: (13)

Since I bought my jdm am finding out more good news to the choice I made all the time, does the uk sti have the same crank as the wrx then.

chris-RB5

Tony always spot on as per usual
Always a good upgrade for any impreza, especially the classic, that's why i put one in mine!
And it looks cause it's black

Shaun

I suspect this is all part and parcel for the higher 8200rpm rev limit of the loverly JDM STI's!

Henrik

iTrader: (5)

ok, so if you were building an engine that wouldn't go much past 7k, then it's an unnecessary expense?

JohnD

iTrader: (5)

although the nitriding has nothing to do with the oil feed, I assume it comes as a "package"
Nitriding is a low temp. surface hardening process where the componant is heated in a carbon rich atmosphere giving a very thin but very hard surface. It has the benefits of being applicable to an otherwise finished componant, just polishing of the bearing journals is required. As it's relatively low temp. it will not alter the structure of the metal therefore leaving it tough with that wear resistant surface. Any areas not requiring hardening can be coated to prevent the carbon impregnating. Obviously, re-grinds are a no-no!
I think I recall that the Mini Cooper S cranks were nitrided (or maybe tuftrided?) back in the '60's ?

JohnD

Midlife......

iTrader: (2)

I thought "Nitriding" used a nitrogen donor ?

Samurai swords were plunged hot into slaves and captives, the nitrogen in body tissues does the same thing........apparantly!

Shaun

TonyBurns

iTrader: (3)

It does use nitrogen, the benefits of this crank are the (cant remember if its drilled or just grooved, or just drilled and not grooved lol) but there is far better oil feed to the main bearings.
The main use to nitride anything is the fact its normally difficult objects to harden, so its a bit of a cheat but does the job, where as hardening a metal will harden it all, nitriding as John said will harden the surface only.

Tony

Midlife......

iTrader: (2)

Hi Tony..

See post 7

https://www.scoobynet.com/scoobynet-...cooby-bug.html

Shaun