Well as some of you may have seen in fleas mapping section, i had my 16vt re-mapped about 3 weeks ago and am very satified with the results!
Only prob i've now got is the car has been letting some quite large puffs of white ish smoke out when pulling up at trafic lights now and again?

To be honest the smoking is gradually gettin less and less, a mechanic has told me to drive it for a thousand or so miles as he says it could be doing it as before mapping my bores were getting washed, and now fuelling is right i should give it chance to CARBON UP as this will create a better seal on the pistons??

The car is driving superb and is alot more responsive and faster since fleas map, also tickover is the best its ever been!

Car is going to motormech again this week to have the timing of my c&b cams checked as it has ALWAYS sounded a little to tapety for my liking since rebuild so i'll prob get pauls oppinion on the above anyway!

Also thinking of replacing my tubular manifold as it has been nothing but trouble.... the massive heat that is created where the 4 pipes meet the flange is causing it to keep splitting, must have welded it atleast 5 times now!!
Thinking of putting the standard one back on, but will ask motormech to port it first!?

Is it just the 4 ports that are ported or can you port the Flange bit thats bolts to turbo??

Oppinions please??

Nick

could be the bore wash since your new rebuild if the smoke is getting less n less thats a win in my eyes.

As for the manifold the guys who built my turbo said it could easily flow 400bhp so im sticking with my oe one.

Does the flea map make the car smoother and worth it?

Power delivery is loads smoother and i'd say fleas work is worth every penny! Gonna go on the rolling road i normally go on once timing has been checked and smoking has stopped! Hopefully i'll be able to see what power 1.45 bar can make? Was only able to get 1.2 bar on the rollers flea uses, but still made 305 bhp! Nick.

very nice cant wait for those results

So you finally got an internet connection again then Nick!

Good to hear it's driving well, how are the coolant temps doing as that was the only thing worrying me (especially after your recent blown head gasket), even with your fans manually switched on it was still getting too hot in city traffic.

Turbo? Valve Stems? Rings?

White smoke is usually water, head gasket more than likely

although it's mentioned that you have recently had a head gasket go if so anti freeze takes ages to burn away so it may be that and as such nothing to worry about, you need to see if the header tank is getting pressurized and if not just run it for a while and see if the smoke goes away

I've got a horrible feeling it may be rings as i've ran quite rich for around the first 6000 miles of my rebuilt engines life, and also my compressions seem quite low! All below 120? Although the smoke doesn't seem blue at all?! I'm desperately hoping i'm wrong as i won't be happy about a possible rebuild.... Again! Gonna take it to motormech next monday and get pauls opinion! Till then gonna clock up some miles and see if i can get the smoking to stop and maybe test compression again?! Nick...

Sorry flea.... Coolant temps are fine now, think i had an air lock after the new head gasket was fitted?? It got quite hot one night last week, the header tank vented a little water from the cap and since then the temps have been fine! Nick....

White smoke can be oil, oil smoke stays present for a while, water (steam) will dissipate almost instantly. 120psi is a little low.

Thick white smoke is usually the turbo.

Worn rings, low compression will not usually cause heavy smoking. But it may push oil out the breather, do you have a catch tank?

Cams can lower the compression test results. Try a leak test. 120 is too low though.

Haven't got a catch tank, infact i haven't even got a pipe coming off my oil breather so it will pretty much vent to atmosphere, so surely i'd see some oil in the engine bay? What is a leak test? So cams may have lowered compression?? Also although its already been discussed i'm sure my wossner pistons will have had a negative effect on the compression as they were so dished in comparison with standard ones? Both the guy who built my engine and the guy who built my turbo have said the same.... Although members on this forum have infactically said they are definately the same compression as standard?? I would be very suprised if it was the turbo, was rebuilt to the highest spec! Also it doesn't smoke at all when on boost, its when i come off the throttle or dip the clutch the smoke is prominent! Nick...

I had this on my old punto gt it was the valve stem seals but you would have had yours changed with the head recon.

I didnt think cams could lower compression but "low compression pistons would" like you have in your car

Thats the point, people on here like begbie and kenneth who obviously know there stuff about 16 vt's have both said the pistons should be the same compression as standard? Nick

Cams can have an effect on compression because compression only start when both valves are closed.

Oil from the rings will go away on boost due to the forces pushing them out words plus you say that it’s not breathing heavy. Heavy white smoke on idle and often on boost indicates turbo.

Just check there is no oil in the intake system.
Check the plugs to see if they are oil fouled.

It's sounding more like valve stem seals. As for the low compression I would also guess that this is head related, possibly tappets or valves are not fully lapped in.

Is it head off to check tappets and valves or is it just rocker cover and cams out? If thats the case why has it just started after re map? Is it simply coincidence or would the extra fuel have prevented it from smoking some how? Nick..........

Remap is probably a coincidence

Wip the valve cover off and check the clearances with a feeler gauge.

Symptoms of burning oil for worn valve guides/seals and a worn turbo are virtually the same. 2 difference are, if its the turbo it wont smoke right on startup, guides will. Also, worn guides may show deposits on the plugs, turbo wont. Also if it heavy white smoke its the turbo, guides produce blue smoke and it gets worse slowly, not overnight.

If you want to know the true compression ratio you should CC the chamber.

A leak test is a way of finding where the compression is leaking out, if at all.

To test, you basically add compressed air through the spark plug boss with a special fitting.

Air out the breather = rings
Air out the exhaust = ex valves
Air out the coolant tank = headgasket
etc
With a test figure of 120, the ammount of air leaking is going to be very minimal, it may take an experenced operator to diagnose it correctly. If there is no detectable leak you can assume your engine is healthy and the test figure, although low is "good". The low test figure could be due to piston dish size etc