smoke - ideas?


nicole_

Well-Known Member
Joined
Jan 29, 2014
Messages
676
This is really annoying me, and no one seems to have much of a clue why it does it lol, so i'm open to ideas...

Bumbling along in slow moving traffic and coming to a stop, i get quite a plume of smoke when I come to a stop. Always when I've been at low revs, and as far as I'm aware its clear when I'm boosting or 'giving it death'. No smoke when I start it up either.
Just seems to be whenever I let off when I'm not going very fast. Smoke is bluey white everytime.
Temperature doesn't seem to effect it...

I thought possibly stem seals as it does it when you're letting off but not sure, its symptons altogether dont quite match up with all the usual things and it's annoying. Isn't really getting any worse but its hard to tell.
 
Does it do it on start up when it's been driven then switched off for 5 mins then re started?
 
Sounds turbo related.
Seals in the centre section will encounter different pressure ratio at low engine speed compared to on boost.
If the turbo isnt garrett/borg/kkk etc it would be my first place to look.
 
Sounds turbo related.
Seals in the centre section will encounter different pressure ratio at low engine speed compared to on boost.
If the turbo isnt garrett/borg/kkk etc it would be my first place to look.

its a brand new Garrett GTX, be miffed if its that!
 
I've never really done that tbh, but I dont think so?
Ok, my theory was the same as what John has suggested, oil leaking in to the exhaust housing.
 
If it's ****** I'll have it lol
 
If its what I am hinting at its exaserbated by low exhaust back pressure - ie 3" system with no cat on a small displacement engine is pretty loose at low speed.

Turbos are often designed for only a trickle of oil - people fit restriction. If you are pumping it in and it overcomes the back pressure it may weep.

I dont know if the seals are actually damaged in that situation or if its just a charactetistic.

I'm only 50/50 on this if I was a betting man, but thought I would offer it as a possibility.
 
You could be along the right lines John , iirc a ball bearing turbo needs a restrictor on the supply line and a journal bearing turbo is wet float so it needs more oil flow and no restrictor

If the turbo is ball bearing and getting too much oil then that could be the issue
 
Would i be able to see it? I've had the downpipe off and it all looked dry, no sign of oil leaks or charcoal build up etc

I do have an oil restrictor on - are there different sizes that allow less through?
 
Its oil pressure related as to what restrictor you would need. The oil is burning so there wouldnt necessarily be a sign - maybe some sooting.
 
I had a similar situation with an old car i had like yourself brand new built engine and turbo, could be a few things, first thing i would do is drop the decat/downpipe and check for oil this would point to something turbo related, seals ? Failing that check compression as the rings may be letting a small amount of oil into the combustion chamber due to not seated correctly although dont rely entirely on the compression tester if possible check the bores with a scope and check for any unusual scoreing, im no mechanic but these were a few of the steps i went through and never really got to the bottom of it, doesnt affect performance but when you pay all that money for a smokey car it gets on your nerves also if you have oem stem seals i highly doubt they will be the problem

If you need anymore help fire me a pm like i said im not a mechanic by any means but if i can help i will :)
 
I had the exact same issue with the b16a(turbo) I had in my EK9 previously, turned out to be worn exhaust guides
 
I read the Honda spec for valve play and was a bit frightened by how far out my head was. (From a smokey b18c)

I expect in the main stuffed stem seals mean worn guides.
I got mine bronze sleeved and honed.

However the b18c bottom end's piston tops were carbontastic. I also have nicole's old bottom end and the pistons were clean....so the guide probably arent terrible anyway.
 
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