hi im a newy just joined today love this place you lot have some awsome cars right here goes had my 2wd saffy for about 8 months done about 300 miles in it been great took out today soon as i go down hills on over run or lift off plumes of blue smoke comes out the back doesnt do it on boost or on a constant throttle got a new turbo on it its done 55 k with all old mots any ideas

 

hi mate welcome to the site. get some pics up of your car sounds like it could be worn rings.have you done a compression test?

p.s what oil you got in it? does it use oil? what breather has it got on?

 

as above fella what grade of oil you using?what power you running etc

 

ive got 10/40 semi syth its stage 3 but only running t3 hybred so not big bhp could wrong oil make it smoke

 

could still be turbo mate.

 

that oil aint no good for ya cossie!change it asap fella u need fully syth in her either mobile 1 motorsport 15w-50 or 10-60w siklene-pro not sure of the spelling of the second one!plus you really need a breather kit on a stage 3

 

excuse me for being nieve ive got a pipe comming out of the block going into the breather and one from rocker cover into breather and one more pipe coming out of breather to atmosphere

 

that sounds like an uprated one.

 

pipes go into a alloy canister looks a bit shit to be honest no oil in inlet or intercooler. could the wrong oil really make it smoke on over run want about valve guides appreciate you help guys

 

ah yes in that case you got a uprated breather kit by the sounds of it!might be stem seals,valve guides etc but in my opinion i would get the correct type of oil in her as the oil you have in her aint up to the task fella!

 

thank you for your help ill get the right oil in it tomorrow and give it a go

 

no probs!

 

mine is really bad on overun ,i've been running mine on 10-40 semi for about a year , just about too change to pro s , to see if it cures it , although i know my t3 is worn just not got round to gettting it upgraded/fixed yet . i'm going to change my oil this week , i thought exactly the same about the right oil . i'm running everything standard at moment .(daft question but would a millers engine flush help not sure whether to use it or not i figure it could do no harm ????)

cheers
gaz.

 

people will have different opinions on the engine oil flush!but in my opinion it is a BIG no no!pure and simply because you could move some crap to somewhere you dont want it i.e oil supply gallery etc!10-40 semi is no where near good enough oil for a cossie as it wil break down at the high engine temps when giving it plenty of right foot action!

 

change oil first ,and check play in turbo

if all else is ok rings could be the problem

how much oil is it useing?

 

change your oil 1st!

Then id do stem seals, then failing that rings!

Ive gone thru thu the same on a 50K motor! Been stood doesnt help them!!

 

welcome to the site blue. cant help you with your smoking probs on your cosworth, but cheers for the reminder, i need to change mine b4 winter.

 

hi there iv got a 3dr its gives a good blanket off black smoke when i pull off ie give it sum and i find it smokes when brakeing from high speeds . its runin stage 3 it has an uprated breather on it iv got 15/50 oil in it any ideas of what it could be thanks

 

poss requires a set up?a cossie will always smoke when being driven hard specially when you back off so would not worry about that side of things!

 

cheers mechanic28 , thats my fear on the oil flush and with 95k on clock i think it could move some friendly deposits ,
mines has always had a little play in the shaft of turbo but has only started smoking more since it has'nt been used everyday .
my turbo has recently been making a squelling noise when first started too , so roll on end of oct so i can get it sent away before it packs in , anyone elso had the squeeling problem when cold ??

cheers gaz .

 

turbo usualy makes a siren type noise when its on boost not on first start up!you sure its your turbo making the noise?

 

black smoke is fuel

 

its when i blip the throttle a little just to get it to idle , dodgy idle valve needs a bit of persuading to work when cold , thinking about it could be a dry throttle body thingy making the noise (really technical me )maybe , was told by msd that my tps was giving an odd dodgy signal aswell when they set it up , maybe these are all related .
just presumed it was turbo cos it sounds like it does when i press the stage 1 button and the turbo is spooling up . think i'l have a busy winter in garage trying to find out so any pointers would be nice .

cheers gaz .

 

hard to say with hearing to be honest fella!maybe take your idle valve out and give her a good clean with some brake cleaner then give her a spray of wd40 to help keep it nice and free

 

yeh think i'l do that anyway while i'm changing the oil , it may have dried up since it was done when set up in jan , only done about 500 miles since .

soz for hi jacking your thread too cosworthlee.



cheers gaz .

 

also as your moaning off black smoke your noise could well be a air leak somewhere!might well be worth having a look around!

 

doesnt have to oil in intercooler to be turbo could be dumping it straight in the exhaust. if turbo isnt very old and no play in the shaft its unlikely to be turbo seal imo.

 

I'd say changing the oil isn't going to stop 'plumes of smoke' bellowing out the back!

My old 2wd used to do this, had the turbo refurbed and it made no difference.. can only assume it was piston ring or bore wear.

 

update on this discussion , changed my oil and filter last weekend to silkolene pro-s from semi synth , defo reduced the blue smoke from my exhaust on overun , only done about 150 miles so far but much better
Still not found the cause of the noise tho , sounds like a dry bearing but goes after a few seconds , have had all the belts done and tensioner , something may be over tight and causing this onstart up , getting it checked once i can get it to garage which did it .

cheers
gaz .

 

does the smoky car in question have the centre box removed? This can cause smoke on overrun as the backpressure is reduced and the turbo seals dont work as efficiently.

 

dont ever use wd40 on idle valves, just thin regular oil.....

 

Hi also new to this site and i have to say so far so good soo much info on here ! i have the same problem with my 2wd, what compresion psi should i get? also i was told once that 2wd are pron to i bit of ware at the top of the piston stroke due the the pin being centered? heard of this ? plus any one know what the fuel pressure should be ? running std fuel pump and 803's stage 3 on a t3 turbo?