More Problems On The Way Home From The Pod-Ideas?

[skiddusmarkus]

As I left the pod,my car decided to start pulling a lot better :twisted: ,just in time for me to catch up with 3 Evos and a Skyline .
However,after driving on the A45 for a bit at around 70mph,my engine started to stutter really badly and wouldn't boost past 8psi.It was running crap on and off boost.
I pulled over at the services and noticed a breather pipe blank had come off,so I reattached it but the problem remained.I checked oil and put a bit in to replace that lost.
As I neared home,I went to my local Shell station to fill up and checked under the bonnet again.I was greeted with oil everywhere,being dumped from the BOV .I filled it up with oil again and drove very steadily home.
When I got home,I thoguht I'd better check my plugs to see if I'd blown a piston and was very puzzled to find that 2 of the plugs had much smaller gaps(approx set at 0.2mm)and one was a bit chewed up-no knackered piston though.
Now anyone who heard my car running today knows how much it was missing,but how did that alter the gaps?Would it chew a plug tip up?
Also,the oil coming out of the BOV-the only thing I can think of is the oil seals going on the turbo.Would this cause boost to fall dramatically(approx half)?

 

[Anonymous]

If it is blowing plugs it could be deting mate you just running the standard breather?

 

[skiddusmarkus]

It's a Forge seperator.Before I had my head reconeed,it used to breathe and I had to blank off the drain plug on the seperaor to stop idling problems.I think it may have filled up over time,but this wouldn't account for the oil being used.
Hope it's not detting -Ginga checked timing and it was only 5 degrees so it shouldn't be.

 

[Fast Guy]

In what way was it chewed up? melted abit? I take it you did set the gaps yourself before you put them in?
Do you have any old plugs you could try, possibly these ones are faulty. I can't see how it would be possible for anything to have hit them closed, unless you have a shed load of carbon in the cylinder.

 

[Olly]

No chance you been lean and melted the plugs then they lost shape and closed up the gap? How much boost you been running?

 

[charlie]

any ideas why it used to breathe heavy in the first place? worn rings maybe?

Try running it up and seeing how much air is coming out a the dipstick :?

 

[skiddusmarkus]

Was running 1bar-not sure why it breathed heavy,I did a compression test the other week and they were all 11bar.Plug tip was shorter than the rest(about half as long).I set the gaps last week-no way were they that small(set at 28thou/0.7mm).
Anyone think it could be the turbo oil seals?

 

[charlie]

i guess the best thing to check, if you think its the turbo seals, is where the oil first occurs in the inlet.


It sounds increasingly like it could be turbo, as from what i read, your crankcase ventilation doesn't go back into the inlet

 

[GINGA]

Sorry to hear about even more problems there was quite alot of oil around the dump valve area when we were looking at it.
You could try venting the breather to atmosphere and see if it stops the oil in the system but you'd need to clean out the whole intake system :shock: as more than likely the intercooler is full of oil now
Probably best to do another compression test aswell just incase.
Mines got high idleing and rough running when cruising now to must have a air leak somewhere now, just got to find :x bloody R's :evil:
Cheers for the octane booster btw 8)

 

[Fast Guy]

Heavy breathing to me suggests worn rings (blow by)
Did you overhaul the engine while it was out (block overbored, honed and new pistons/rings) or did you just stick new pistons in an old bore, or not even touch the engine internally?

I'd stick another set of plugs in and see what happens. My initial thought was that you must have run lean and detted, but I remember you saying you'd been running rich (what told you that?)

What's the chances of something having gone through the engine and hit the plugs? (probably about 0)

I haven't seen our head from the inside, would I be right in assuming it isn't a flat design where the piston could come up and hit the plug?

If it is still heavy breathing and oil is getting into the intake, it can lower the octane rating of the fuel and make you detonate easier.

 

[skiddusmarkus]

Problem diagnosed :

No.1 piston-150psi
No.2 piston-145psi
No.3 piston-80psi
No.4 piston-80psi

I was really hoping it wouldn't be the rings .

 

[Fast Guy]

which cylinder were the bad plugs in?
If you have been running too rich, you can suffer bore wash, where the excess petrol washes the oil off the cylinder walls, and that will help your rings to an early death. and possibly damage the bore/pistons too.

Head gasket blowing between nos 3+4 cylinders?

Det on number 3+4 pistons :shock: