all the redex drained out of the chambers

BMCC · Post by **BMCC** » Tue Jul 31, 2012 12:42 pm

I thought black smoke would be unburnt fuel? Maybe your car's over fuelled or the ignition system is weak. What about getting the car dyno'd to look at torque/BHP and air to fuel ratio?

2lude · Post by **2lude** » Tue Jul 31, 2012 1:18 pm

Could this not be down to the scores in the frm liners ?

bennyboy · Post by **bennyboy** » Tue Jul 31, 2012 1:27 pm

lewd lude lover wrote: i then glugged in 35ml to each chamber and let it sit for an hour.

By that point, wont the engine have started to cool down pretty well? I only say as surely that would then allow a tiny amount past the rings, since when they are up to temp, they must expand slightly?
Note this is only from a 'common sense' understanding, not a mechanics?!!

Also - My 176k H22A2 was run on 10-40 for at least 10 years and I used to use up to 1l per 1000 miles.
The new engine is on 0-40 and hasn't burnt any at all in over 1000miles

BUT it is effectively brand new I guess.

judderod · Post by **judderod** » Tue Jul 31, 2012 1:40 pm

If it ain't broke don't fix it.

But mixing oil with redex (naptha) will significantly thin your oil, increasing wear, and could even cause a fire/explosion inside the crank case. Then it will be broke, and you'll have to fix it

From my experience, cleaning an old engine isn't usually a good idea. The carbon deposits can actually help compression and keep a barrier between air/fuel and oil. Redex in the fuel to clean the injectors can help, but if they're blocked it should be done properly by removing them and getting them ultrasonic cleaned. But engine flushes often do more harm than good.

H22's run pig rich at WOT to allow for differences in fuel quality and to stop the engine getting ruined with the likes of us folk shove an induction kit and phat exhaust on for sh*ts and giggles without altering the fuel ratios to make up for the changes in volumetric efficiency. Hence black smoke isn't usually anything to worry about.

Post by **lewd lude lover** » Wed Aug 01, 2012 1:02 am

cheers guys. some useful info there.

I dont remember saying anything about colour of smoke. black smoke out of a h22 is normal.

the big puffs of blue that come out on over run however are not

it is these i am attempting to effect. thus trying to dislodge any carbon deposits on the piston rings to help the seal of the rings.

i didnt mention age either to be honest... the head was fully rebuilt less than 3k ago and the bottom has less than 70k on it.

judderod · Post by **judderod** » Wed Aug 01, 2012 11:14 am

Have you done a hot WOT compression test?

Sounds like the oil rings have given up. There are a few engine additives that might help, as a last ditch effort. But unless oil consumption is really high to the point of fouling the plugs and affecting performance, I'd leave it alone and start planning for a bottom end rebuild/swap.

Post by **lewd lude lover** » Wed Aug 01, 2012 12:24 pm

cheers. i have not had chance to get anywhere near a garage yet. its on the list though.

im going to pop a good quality 10w40 and some of that Forte oil enricher and see how it goes. if it eats that at the same rate as the 0w30 (2l per 1000miles) then it will get fed halfords and i will drive it like its a bitch that needs breaking....till it breaks. then i will swap my spare into it

at least i know its knackered and its not worth mooching it too much. drive it like i stole it

Post by **Lude-dude** » Wed Aug 01, 2012 12:31 pm

since I had my piston rings and valve stems done, I have used nowhere near as much oil

I was topping up every month at one point, I havnt topped up yet on my new head

if your replacing the engine anyway I wouldnt worry about just keep topping up, but on the new engine might be worth replacing the rings and stem seals, common wear on the h22 it seems

judderod · Post by **judderod** » Wed Aug 01, 2012 12:47 pm

0w30 that stuff's like water mate.

Get some 10w40 in there http://www.ebay.co.uk/itm/130738441649

Lude-dude wrote:since I had my piston rings and valve stems done, I have used nowhere near as much oil

+1

The only oil I use now is due to the high crank case pressure/blow by from forged pistons pushing it up and out the rocker cover.

littlefeller · Post by **littlefeller** » Wed Aug 01, 2012 1:06 pm

personaly im still convinced its everyones aftermarket filters are to blame for the smokey engines. although i will also point out that mine does smoke on vtec if i dont use it for a while (vtec that is not the car) although if you blink you will miss it, it really is so faint. judging by everone elses posts on this and other threads it seems its fairly normal for it to need a topup and to smoke a little, mine doesnt loose oil but it only getts minimum use now, i was using 10w40 for 6 years and didnt really loose any, its now on 0w30 fully synthetic (on offer at morrisons) and its still the same - no loss. supose if your doing 1000 miles plus regulaly then a topup is expected. i once had a civic type r in front of me at that too smoked momentarily as it went into vtec, so hey looks like they all do it to varying amounts

and if its still kicking ass i wouldnt wory about it