turbo oil feed

[Pappu1]

do turbos have a higher rate of death if there is over flow of oil or under flow

(banjo bolt either too big or too small)

not extreme difference but slightly either way

[boon]

Undersized. If there's too much oil flow it will just 'push' a little bit of oil through the bearings resulting in smokey exhaust. It's like running an engine rich vs running it lean. Rich is inefficient but you're unlikely to break anything (except maybe your plugs after a while, haha)

[jpar196]

Has your turbo done a bearing ? as far as I know journal bearing with undersized feeds will break their bearing, and bb turbos with oversized feeds will make the seals go resulting oil burning through the exhaust

[soopersubaru]

Banjo bolt exit hole(turbo entry) carefully sized to match turbo...Journal or ball bearing...and size of turbo. Would not alter personally.

[Pappu1]

my mate is buying a blown one and rebuilding

in fact 2 ppl i know of are doing that lol

anyway the guy was asking me and i have no idea..

i gather from the above that its better to overfeed than underfeed..?

obviously not ideal but just if u didnt have the right size bolt and had option of either under or over, which one will be the go.....?

oh the turbo is a jurnal bearing unit...

whats the effect of that on the seals?

[WRXONP]

If you go over it wouldn't be so bad at all as theirs a restrictor in the turbo - if you have a smaller banjo than the restrictor in the turbo your going to cook it

[Stoffa]

I put a vf36 core in my car and ordered a banjo bolt off a v8 spec c chassis number so I had the correct one

[soopersubaru]

 pappu said:

my mate is buying a blown one and rebuilding

in fact 2 ppl i know of are doing that lol

anyway the guy was asking me and i have no idea..

i gather from the above that its better to overfeed than underfeed..?

obviously not ideal but just if u didnt have the right size bolt and had option of either under or over, which one will be the go.....?

oh the turbo is a jurnal bearing unit...

whats the effect of that on the seals?

better to overfeed journal bearing....but not ball...would be inclined to find the correct sized one though...seal failure can occur if too much pressure is in either type of bearing.

[vorigan]

ok each turbo has a specific feed as in oil volume that is specified by the manufacturer.

Over feed is just as bad as under too much creates excessive parasitic drag slowing response and over heating the bearings, again SEALS DO NOT JUST FAIL !!!!!!!!!!!!!!!!!!!!!! FFFFFFFFFFFFFFFFFFUUUUUUUUUUUUUUUUUUUUUUUUUUUUU..........and the last bit.

Seals do NOT move or rotate, ok?

Seals are there to help any in balance between boost exhaust and oil pressure all being equal there's isn't an issue things like excessive crankcase pressure will cause leakage again the seals haven't failed.

Turbos don't have an issue with pressure volume they do thus why oil feed is very important so NO more is not best and pending bearing clearances and thrust design depicts the volume and that you dont guess at.

ps: if your mates are having a go at rebuilding turbos there's a good reason why i have a 40k balancer ....and keeping the alignment taking them apart isn't good enough at least not in my shop.