ok i have put the car back together and its smoking, the problem is when you start it after its been parked up for a while or left to cool down if you drive the car the smoke clears but when sat at the lights and stopped when you go back on the throttle to pull away it smokes again just a puff then nothink it doesn't always do it. there is no smoke on boost or when you let off the gas, i have done a compression test and cold its 6 bar and when warm its 8 bar, i have checked all the group a breather system and this is clear the inlet and head and every think was chemically cleaned i have had new bronze valve guides fitted along with new stem seals and had the valves re cut new mountune multi layer gasket arp nut and stud kit all new gaskets for top end. is this head gasket re useable ?

if you leave the car parked up for a bit and pull the plugs out you can see a small amount of oil in the bowls of the pistons all 4 i will be investigating it tomorrow with a bore scope but any help would be great

 

Was it new pistons/rebore ?
tabetha

 

pistons were not new this time round they have done about 5000 miles since they were replaced with genuine cosworth wrc items there was not any wear on bores at all, just very weired that its only all 4 piston crowns started it this morning and no smoke will drive it again later and see and will have a look with the bore scope

 

ok just done the leak test and the readings i got were as follows

no1: 10 % no2: 6% no3: 6% no4:10%

re tested and got

no1: 8% no2: 4% no3: 5% no4:5%

also had a look with the bore scope and can't see much just a very small film of oil in the bowls of the pistons also had a look up the inlet and there is no oil there no oil in the intercooler either

what you guys think pull the engine out and strip it or any think else i can do to fix it.
to me it still sounds like valve guides but just had these done by ctm in dagenham

 

if its the bottom end how much do you think i will have to spend £2000

 

Turbo????

 

turbo has just been rebuilt and i have opened the waste gate and removed the oil feed and stuffed a rag in the front of it and run it but no change

 

My engine's just been rebuilt and sounds very similar. Bit of oil in the cylinders, puffs of smoke, perfectly normal.

Charlie

 

its smoke alot now though when you first start it its like starting it with the turbo blown but its not as it been rebuilt and the oil is burning off in the cylinders