Looking at a car for someone at the min,
Its using oil but engine comp is fine wet and dry,
Borescope shows no horrors (it is a fresh forged engine)
Valves dont seem to be passing oil,

I think its the turbo seals... But unsure is its high oil pressure thats blowing them (its a roller bearing) or if the engine has too much blow by?

It has more blowby than mine, can feel that just from taking oil cap off,

Hiw can you measure it? Or is the soloution to just breath to atmos instead?

 

If it's fresh it'll blow till it is run in. Regards the turbo, if it's bb it has got a restrictor in right? Plumb in a boost gauge with a vacuum side, coast down from 70 to 50, if it don't pull a good vacuum the rings are bedded in yet

 

leak down test would show how much blow by could occur in rings/valves.
i knackered a ball bearing turbo seals due to excessive oil pressure, turbonetics turbo didn't say to fit a restrictor, so i didn't seals are knackered

 

nar it hasnt got a restrictor... but its a "reputable" tuner thats done the work...

they advised him he needed a rebuild so he did....

still used oil,
then they re-conned turbo and said it was ok.... (charged again for this)

when he got home still useing oil...

ive got it at the min and theres no blue smoke when driving but you can smell the oil....
after driving for a few mins, if you drop a cog and GO for it.. big puff of blue/grey smoke and off ya go..

no smoke on start up at all,


anyway back to the restrictor... nope they never fitted one..... some GT28 conversions have got away with it... but i am sure its the turbo that using the oil....

 

All GT series are recommended an oil restrictor by Garrett.

 

I guess you can measure blow-by by fitting a boost gauge to block or cam cover, i've seen this on a Julian Godfrey engine they link it to ECU to back off if it gets too high, not sure what is too high though, maybe compare it with a similar engine that doesn't do it?

 

When i had my gt28 conversion done many many moons ago
(by same tuner) mine didnt have a restrictor either,

I know all roller bearing turbos need them and i have one in my blouch turbo too,

I think i will get one for him then he will have to sort out warrenty for the turbo.....
And i will recomend fitting a better breathing system,

I think the cars putting out about 340hp (thats what it feels like to drive)
So an uprated breather system maybe needed....