Scuba

The above...it seems every one I see has some sort of quick puff of blue/black smoke from the exhaust when they change gear of hard accelerate.

jameswrx

iTrader: (4)

The ones I've had used to do this. Puff of oil smoke when changing gear during hard acceleration and slowing fast from prolonged constant driving.

Worse they ever used to do it was after a motorway run and coming to a stop at end of slip road after being on the gas.

One of them had an engine rebuild which I ran in when I bought it, and it still did it.

Turbo?, ring tollerances?, not sure. I'd guess rings, because I even had a turbo rebuilt on one and it still did it.

All the Jap performance cars I've had have never used any oil between changes at all.

Rich D

iTrader: (12)

It's the turbo...

They're all old now and the turbo's don't last forever, although they can run like that for a long time!

class_A

Isn't it just the breather system working really hard?

J4CKO

iTrader: (1)

Cosworths ?

Make that all Sierra's,

Sod it,

All Fords over five years old.

jameswrx

iTrader: (4)

Can't agree there, had reconned turbo, no difference.

Scuba

Possibly the turbo stalling then spooling up the gas flo again during gear shifts?

si325i

valve stem seals??

Rich D

iTrader: (12)

Well maybe not the turbo in your case, but it's probably the case on quite a few of them...

Scot123

Yup its the valve stem seals. Oil gets sucked down when you close the throttle and poof.....

I don't get blue smoke though just a lovely shade of brown

dazc2

If the engine and turbo are in perfect condition then it's the breather system....

One of the first thing on a Cossie to upgrade is the breather system as they are not very good to start with. The uprated breather stops ANY oil at all being drawn into the inlet manifold as it breathes into an oil seperator (oil then returns to sump) then a catch tank and then to atmosphere.

If the car still puffs out on gear change then the turbo is probably getting a little tired as the thrust bearing begins to let the turbo shaft move back and forwards on and off load.

These cars always use a little bit of oil anyway. It even states that in the owners hand book. At the end of the day it's a glorified Pinto bottom end so tolerances are not ideal but are a lot better on the later cars.

[Edited by dazc2 - 1/7/2004 10:06:23 PM]

CC

a little bit of oil can sneak past the rings due to the pistons being forged as standard (quality ) and not cast ala scooby, they expand/contract and some oil can get through producing that 'puff' of smoke under load and hence y healthy cossies cam appear to use some oil.