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Old 14-06-2018, 07:44 PM   #1  
Russ6334
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Default Sierra cosworth oil consumption

Hi all

after years of wanting one I finally got a cossie, 4x4, 69k miles ans very good condition

just working through some issues, I fully serviced it today, I drove it back to Plymouth from Hull and some short trips and have done 400 miles, itís never missed a beat but when I checked the dipstick after the 400 miles barely over a tank of fuel the dipstick barely showed any oil. It was toppers when I left hull!

i drained the oil out and only had 1800ml in the sump and filter!

All 3 forward plugs are brown but dry the rear one is slightly wet but nothing compared to my Norton commando!

it doesnít smoke oil but does spit soot out of the exhaust, I got a napkin and held it up to the exhaust for 10 seconds and it had spatterings all over it though itís soot not oil.

it does chuff loads of misty oil out of the uprated oil breather which then gets sucked back into the cabin! But other than that canít see any issues

i read they drink oil and that ford say a pint every 600 miles somewhere on a forum but 2+ litres in 400 miles???? Thatís excessive!

As I say plugs are dry bar one and doesnít have oily exhaust could it just be breathing out of the breather?

also worth noting no great amount of oil underneath the engine and none on garage floor.

will do a compression test this weekend

russ This is all that came out after 400 miles
Noticed this after revving it a bit itís all soot powder no oil
Again just soot that wipes off
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Old 14-06-2018, 07:48 PM   #2  
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Forgot to say itís got a T4 turbo, remapped, and bigger cams plus charge cooler thatís water cooled with separate system thatís the main mods have print outs of 348bhp but havenít gone through enough of the history to show proof of whatís been done but has been modded
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Old 14-06-2018, 08:37 PM   #3  
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Sorry for the bombarding!!!

so did a compression test all pistons 125psi but the rear piston with slight wet plug was 136psi which would make sense as oil giving a better seal but still nothing to worry about

so Iím fresh out of ideas maybe cossies just drink! Front 3 125psi rear 136psi
From left to right is front to back after 3 miles drive when warm on new plugs
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Old 14-06-2018, 09:05 PM   #4  
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That does sound like excessive oil consumption but they do like to drink it. Some seem to be a lot worse than others.

They like to eat valve guides too, Maybe that's your problem but you'd expect smoke on start up?

What injectors are you running?
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Old 14-06-2018, 09:06 PM   #5  
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It's probably worth taking it somewhere to get it setup on a dyno
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Old 14-06-2018, 09:09 PM   #6  
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Looks very rich to me. And only 348bhp and with a T4 and cams.

Check all breather hoses and clean. Check all turbo pipes for oil.
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Old 14-06-2018, 09:25 PM   #7  
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Iím slowly going through it but will check all that when I can

if the guides were leaking I would expect to see oil on plugs or in exhaust.

my commando is always wet on one pipe cause the guides are gone and havenít got round to fixing it

ive put in 10w 50 now see if that makes a difference, itís running green injectors but like you say maybe itís not set up, has loads of history but like all history 50 pages of print outs from ford for wipers and bulbs means [email protected] all!

Have to to go through the history properly! Have to say itís most powerful car Iíve ever driven closest was 170bhp bmw but whilst it is quick it doesnít blow your mind, I used to drive Volvo T5ís and they gilt comparable so maybe it does need setting up?

anyone know of a good place in the south west?

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Old 14-06-2018, 09:37 PM   #8  
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I am wondering if its something to do with the oil breather system not working properly and oil is getting blown out of it and not going back into the sump. For it to use that much oil in 400 miles is not normal If it is not blowing out blue smoke on start up or when coming on boost and there is no signs of any major oil leaks that cuts out the usual things that you would think are causing it to have such a high oil consumption.I just did 370 miles in my 2wd Saff to Santa Pod in hot weather and some fast driving and when I checked the oil it needed less than half a pint to top it up again and my rebuilt engine has done about the same miles as yours.
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Old 14-06-2018, 09:38 PM   #9  
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Didn't the guy from msd set up a place in Devon somewhere?

Definitely sounds like it needs setting up.
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Old 14-06-2018, 09:43 PM   #10  
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Didn't the guy from msd set up a place in Devon somewhere?

Definitely sounds like it needs setting up.
It needs setting up properly as the black soot points to an over rich mixture but I cant see that has anything to do with it losing so much oil in such a short journey.
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Old 14-06-2018, 10:20 PM   #11  
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What do you mean by uprated breather? WRC type?

Mine fired most of its oil out the dipstick until I sorted a proper breather system - its well worth making sure everything is clear and functional (maybe a hose has collapsed for some reason or something simple?). Can you see any sign's of oil on the engine/ anywhere?
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Old 15-06-2018, 02:32 AM   #12  
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Quote:
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Didn't the guy from msd set up a place in Devon somewhere?
Autodynamix.

Greens and a T4 dont go together.

If the motor is healthy then greys and good map would be my next move. Good luck with it
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Old 15-06-2018, 05:36 AM   #13  
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The injectors are definitely green but as for the turbo I can only go on what I was told, donít know enough about turbo identification to id the turbo but looking online looks standard
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Old 15-06-2018, 05:37 AM   #14  
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And breather system it has a big allow tank and filter that catches condensation and a swirl pot to return the oil, it does catch condensation but as said before sometimes you can see oil mist blowing out the nonentity vent and it dribbles down the inside of the wing
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Old 15-06-2018, 05:49 AM   #15  
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Itís a hybrid t34 turbo apparently but again wouldnít know how to confirm
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Old 15-06-2018, 07:48 AM   #16  
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Quote:
Originally Posted by costina View Post
Looks very rich to me. And only 348bhp and with a T4 and cams.

Check all breather hoses and clean. Check all turbo pipes for oil.
It's a t34 not a T4
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Old 15-06-2018, 07:51 AM   #17  
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Is there much difference between T34 and T4?

i have printouts with no dates or registration that shows numerous runs as low as 280 to 348 bhp

not sure what itís actislly running but think it needs setting up as too rich This is where the exhaust sits in the garage
Iím starting an exhaust art business!!!!
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Old 15-06-2018, 08:00 AM   #18  
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Quote:
Originally Posted by Russ6334 View Post
[left]Is there much difference between T34 and T4?
About 80 bhp
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Old 15-06-2018, 08:08 AM   #19  
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Buying a Cossy is not like buying most normal cars and accurate history is very important. I am suprised that who ever you bought it from did not give you a detailed breakdown of what has been done to it. If you take it for a rolling road set-up whoever does it will need to know exactly how the engine has been built up or what modifications have been done. My advice would be to find a Cosworth specialist who can help you sort out the obvious problems and once that is done you will be able to enjoy driving it without having to worry about it running out of oil etc.
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Old 15-06-2018, 08:12 AM   #20  
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Check the turbo for end float it should be negligible
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Old 16-06-2018, 07:53 AM   #21  
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Thanks all for the advice greatly appreciated

I read through receipts and it has a t34 cams though reading receipt doesnít say uprated albeit was done by a tuning company and a lot of money spent with that firm

was dynoíd a few times but last time was over 10 years ago so think I will have it set up again

thanks
russ
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Old 16-06-2018, 08:35 AM   #22  
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There old cars now and most have been abused and fooked about with. If that’s the car you like and want then none of that really matters. The car will end up as good as your prepared to spend on it. Best thing you can do as already said is take to to a cosworth specialist who has the equipment to check the fuelling / set up be that on the rolling road or on the road.
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Old 16-06-2018, 08:53 AM   #23  
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Quote:
Originally Posted by Russ6334 View Post
Thanks all for the advice greatly appreciated

I read through receipts and it has a t34 cams though reading receipt doesn’t say uprated albeit was done by a tuning company and a lot of money spent with that firm

was dyno’d a few times but last time was over 10 years ago so think I will have it set up again

thanks
russ
I think T34 is the turbo, most up-rated cams start with a BD prefix. Popular upgrades are BD 10,12,14 and 16. See if any receipts are for those. Study the receipts and try to get an accurate assessment of what has been done to the engine as who ever sets it up will need this information. Good luck and I hope you get to the bottom of the high oil consumption.

Last edited by cossynut2; 16-06-2018 at 08:56 AM.
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Old 16-06-2018, 01:03 PM   #24  
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Apologies should have been a comma there -t34, cams etc


However now has grey injectors
BD10 cams not sure if thatís updated or standard
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Old 16-06-2018, 03:10 PM   #25  
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Quote:
Originally Posted by Russ6334 View Post
Sorry for the bombarding!!!

so did a compression test all pistons 125psi but the rear piston with slight wet plug was 136psi which would make sense as oil giving a better seal but still nothing to worry about

so Iím fresh out of ideas maybe cossies just drink! Front 3 125psi rear 136psi
From left to right is front to back after 3 miles drive when warm on new plugs
Do a leak down test this will tell you much more than a compression test.

Mark
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Old 16-06-2018, 03:26 PM   #26  
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Quote:
Originally Posted by Mark Shead View Post
Do a leak down test this will tell you much more than a compression test.

Mark
had a look in eBay appreciate they are cheap but canít find one that goes over 100psi my pistons are 125psi so could bugger the gauge before even started
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Old 16-06-2018, 07:01 PM   #27  
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had a look in eBay appreciate they are cheap but canít find one that goes over 100psi my pistons are 125psi so could bugger the gauge before even started
cranking compression has nothing to do with leak down.

Mark
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Old 16-06-2018, 07:26 PM   #28  
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Not sure I understand how it works then, one assumes you would crank it to get your pressure then the other gauge shows the loss over time?

or am I misunderstanding itís design?

Apologies never heard of a leak down test before today
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Old 16-06-2018, 08:23 PM   #29  
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Not sure I understand how it works then, one assumes you would crank it to get your pressure then the other gauge shows the loss over time?

or am I misunderstanding itís design?

Apologies never heard of a leak down test before today
The tester measures how much leakage through the valves or pistons and you listen to where the air goes and this will give you a much better guide. If all the air is going past the rings this will tell you that itís why itís using oil.
Any good garage should have a leak down tester.

Mark
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Old 17-06-2018, 10:51 AM   #30  
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Got it! Have ordered one online will report back in a week
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