dependencies

82 SC
No visible leaks
One Litre of oil =250 Miles,
no visible smoke when driven, but a small cloud on start-up
(nearly) every time, hot or cold.

very slight whiff of burnt oil
(as if on exhaust)


so whats likely the cause.......

lewis9113.2

one litre per 250miles is very high oil consumption; what miles are on the engine?
regardless, sounds like a top end recon is in order.
so valve guides, valves, rings, etc etc....

In the mean time, you might want to go to a thicker 20/50 oil and see what happens then to the oil consumption and smoke

dependencies

Engine re-built, after serious crankshaft/bearings incident.

My piston/Barells were utilised, from original engine
(which was a non smoker)
why though,
Would mechanic not also use the matching head with all the matching valves-rockers etc,

I ask since valves/guides are the the only elements remaining
which I suspect of causing smoke

theiceman

Depends....
I guess you should ask the mechanic that question , how do you know he didn't use the same heads? . What oil are you running Brand / viscosity ? what was the milleage at the incident ? what is the millege now ?

I think really there is not enough info presently ro answer your quetions. After you talk to your mechanic we may be able to help. Did they put new rings in ? including the oil scraper ?


ice

Peter Zimmermann

Bad valve guides are rarely responsible for start-up smoke. That's the domain of piston/cylinder sets. The oil that produces the smoke enters the combustion chambers, usually past worn rings or a cylinder that is out of spec. If a ring was broken during assembly that could explain this. Also, if the pistons were not put inside the same cylinders, that could also be the problem. Needless to say, one qt/250 miles (approx) is really high consumption. FYI: valve guide smoke is noticeable on decel, after the engine is warm. Drive the car for the distance of a city block (2nd gear is OK) at about 4,000 rpm, then decelerate while watching your mirrors. Smoke = bad guides.
Pete

dependencies

I only point at the heads, since the original engine I've had for Five years, was most definately 'not a smoker'

I understand the pistons/barells old engine stayed together, as not needing changing,

yet the motor smokes (a lot) on start-up.

I should perhaps clarify

the engine I bought car with, had a failure of crank bearings,
and easiest way forward (we thought) was plonk another engine in car

rather than face a really expensive total rebuild


hmmmm, wonder if I've done the right thing here

dependencies

what time is it CA by the way?

UK its 11PM

Peter Zimmermann

I think that you're about 8 hours ahead of us. I can't remember if the British GP is on at 5:00 am, or 6:00 am (pst) - Sunday morning.
Pete

theiceman

Depends on daylight saving too I think Pete.