pinking problem

[sergei]

Motors don't "carbon up", never have done.

Oldschool V8 guys used to run leaded fuel, as everything did. The "carbon" is actully lead, It doesn't happen any more or if it does, it's because it's been burning lots of oil & needs a rebuild.

Steve

Actually they do, since you are mitsi guy you should know better about those GDI engines carboning up to their death.

[sergei]

http://forums.finalgear.com/general-automotive/to-seafoam-or-not-to-seafoam-34976/#post953494

here are examples of carbon build up.

[MAGN1T]

GDI motors "carbon up" due to the EGR, same reason Diesels do. Because the rings are worn, the oil vapour from the exhaust goes back into the intake and condenses on the walls.
Seafoam doesn't work........ theres a thread about it's "fail " on msport. It's just one more of the many sales scams you get with cars.

Steve

[sergei]

GDI motors "carbon up" due to the EGR, same reason Diesels do. Because the rings are worn, the oil vapour from the exhaust goes back into the intake and condenses on the walls.
Seafoam doesn't work........ theres a thread about it's "fail " on msport.

Steve

Yeah, I wasn't sure about seafoam, I posted that as a pictorial of examples of carboning up.

I have seen various non-egr cars carboning up as well (including 20v).

[QikStarlie]

Motors don't "carbon up", never have done.

Oldschool V8 guys used to run leaded fuel, as everything did. The "carbon" is actully lead, It doesn't happen any more or if it does, it's because it's been burning lots of oil & needs a rebuild.

Steve

but lead coating isnt a bad thing. you'l find it was the quality of the fuel back then. dumping lead in it made it better, but if it wasn't refined as good as today's fuel, plus rich mixtures and poor combustion = carbon build up

so in other words if your new school car is doing it. is not running right, or someone tipped sugar in your fuel tank etc..

you could try thrashing the shit out of it, using the old excuse of "blowing the carbon off the pistons" for lols, if pouring water in the engine doesn't do it for ya

[Skin]

you realise its a 7afe? ringing the nuts off of it still wouldnt attract the attention of the po-leece over here!!!

Gonna try pouring boiling water down the intake over the weekend, see what happens....

[metal_sean_head]

you realise its a 7afe? ringing the nuts off of it still wouldnt attract the attention of the po-leece over here!!!

Gonna try pouring boiling water down the intake over the weekend, see what happens....

Video proof please!

[Dell'Orto]

It works alright actually, just dont go dumping a litre into the intake in one hit

Ever seen the inside of a motor thats been running water/meth injection?

[MAGN1T]

It depends on the CR of the motor. Some 7AFEs are 9.5 to 1 so you really wouldn't want to run it on anything other than 98.
Yes WI keeps them clean but nowhere near as clean as CNG or LPG.

Steve

[Mr Revhead]

Bs

[Crucible]

Ever seen the inside of a motor thats been running water/meth injection?

A guy I used to work with few years back was right into the stock car scene, he had a valiant running on methonal and reckons he had to switch it back over to petrol, run it for half an hour or so after a meet otherwise the bores would go all rusty.

[sergei]

Ever seen the inside of a motor thats been running water/meth injection?

A guy I used to work with few years back was right into the stock car scene, he had a valiant running on methonal and reckons he had to switch it back over to petrol, run it for half an hour or so after a meet otherwise the bores would go all rusty.

All alloy parts will be corroded badly after running water/methanol injection for prolonged periods.

[Dell'Orto]

Yeah, running the motor on methanol is a bit different...it is a very effective solvent so not surprised it'd rust up bores!

[QikStarlie]

It depends on the CR of the motor. Some 7AFEs are 9.5 to 1 so you really wouldn't want to run it on anything other than 98.
Yes WI keeps them clean but nowhere near as clean as CNG or LPG.

Steve

haha @ 9.5:1 compression ratio needing 98 octane.

[Skin]

Lol, i probably should of made it more clear i was kidding about pouring water into the engine, shes my daily, no way im doing something as risky as that!!! And yeah, i somehow doubt an australian market car, made in 1997, needs 98 octane to run correctly

I have a theory, tell me what you think. It appears the car is burning quite a bit of oil, which is fair enough considering its done 316k. Could it be this excess oil which is preigniting the fuel, or perhaps contaminating the fuel enough that its lowering the octane rating? Im going to pour some stop smoke into it, try and gunk up the piston rings a bit more.

[Mr Revhead]

Yep, could very well be that.
blow by causing excess oil vapour to be pushed through the pcv system and into the air intake will do that.

Pull the intake hose off and see if you have a lot of oil residue in there.

[RS13]

Yep, could very well be that.
blow by causing excess oil vapour to be pushed through the pcv system and into the air intake will do that.

Pull the intake hose off and see if you have a lot of oil residue in there.

Seconded. Maybe even rangi up an oil catch can with a coke bottle or something, see if that makes a noticeable difference.

[Skin]

Yep, could very well be that.
blow by causing excess oil vapour to be pushed through the pcv system and into the air intake will do that.

Pull the intake hose off and see if you have a lot of oil residue in there.

Seconded. Maybe even rangi up an oil catch can with a coke bottle or something, see if that makes a noticeable difference.

Haha, rangi. The looks i get here when i use that in a sentance are priceless