Turbo

Perhaps a few english lessons wouldn't go astray.......

Hi Ross could you please ask what ever you need to ask again , but this time read it before posting because there is alot of peaple who can help but only if we understand what your asking ??

Im not having a go at you mate I just got a little lost reading your post

Regards JB.

I must admit that a turbo running on roller bearings is not something I have heard of before, usually they run a hydro-dynamic bearing (turbo shaft floats on a film of force-fed oil). Assuming it is actually running on roller bearings as the metal heats up it expands, due to different shapes and metal/alloy types in the turbo and bearings, at some point a part will expand to the point where it fouls against another, resulting in scoring and damage of that part. After it cools it may be totally stuffed or it may just be an irregular shape or scored, which will also eventually stuff it. Hydro-dynamic bearings would definitely be the better choice for turbos.

Roller bearing turbo's are the weapon of choice in the high performance industry. Their main benefit is the ability to spool up the turbo faster thus allowing a larger turbo than usual therefore increasing airflow and more horsepower. Quite a few of the competition 4x4 guys are now using roller bearing turbo's as they are getting more power and less lag than with the old floating bearing type.
One major problem of the roller bearing turbo's however, is that if it needs a rebuild then generally the whole centre cartridge needs to be replaced rather than just a centre bearing and a couple of seals.
Regards Andrew.