Redex revisited.....

Minstadave · 15 Oct 2013 at 15:26

It's exposed to the exhuast gas via the EGR system. The residue on the intake valves is a mixture of oil from the PCV system and carbon from the EGR system isn't it?

haaammit · 15 Oct 2013 at 16:48

You can all chip in a few quid each for the rolling road sessions and I'll see if I get the same results on my vr if you want

MarkDavis · 15 Oct 2013 at 16:56

Matt82 said:
The valve head isnt exposed to any of the combustion process, hence it shouldnt be sooty

It's exposed to post combustion gases and residue which is inevitably going to contain some carbon.

Matt82 · 15 Oct 2013 at 17:20

the valve head on the intake valve is never exposed to exhaust gases.

the intake valve is only open on the intake stroke. it only ever sees fresh air (mixed with pcv junk) and only sees fuel if its an indirect injection engine.

none of the junk on that intake valve is exhaust soot

Minstadave · 15 Oct 2013 at 17:37

How does egr work then if it doesn't dump it back into the inlet manifold?

Matt82 · 15 Oct 2013 at 18:40

ok, no one likes a smart arse

Ive not heard of it being a problem for petrol engined cars. Can you post up some links to information? I wasnt aware of it being one

Relentless81 · 15 Oct 2013 at 19:39

Tried it in my Nova SR once, lots of smoke came out

ShakenNstirred · 15 Oct 2013 at 19:52

Minstadave said:
How does egr work then if it doesn't dump it back into the inlet manifold?

it does do that

Minstadave · 15 Oct 2013 at 20:32

Matt82 said:
ok, no one likes a smart arse

Ive not heard of it being a problem for petrol engined cars. Can you post up some links to information? I wasnt aware of it being one

You posted a picture of a valve from a car with exactly the problem. Clogged intake valves. :confused:

MarkDavis · 15 Oct 2013 at 22:36

Dogbreath said:
If anyone thinks that Redex/Seafoam/Terrclean will magically remove carbon deposits built up over thousands of miles they are sorely mistaken. Try decoking some old valves and you will soon realise just how difficult the carbon deposits are to remove.

Terraclean uses a different process according to the manufacturers. Can't say that I've heard of anything known as 'columbic fractionation' though (and neither has Google) and I can't see how it cleans the catalytic convertor....

http://youtu.be/9sjZ1wib34w?t=3m40s

Minstadave · 16 Oct 2013 at 07:35

Terraclean is only getting in via the fuel system too, so won't reach the intake side in any significant amounts. Even seafoaming via the inlet manifold doesn't get the intake valves clean.

Matt82 · 16 Oct 2013 at 08:18

Minstadave said:
You posted a picture of a valve from a car with exactly the problem. Clogged intake valves.

but if the pcv hadnt made everything oily the tiny about of soot in a properly running petrol engine wouldnt stick.

eatcustard · 16 Oct 2013 at 10:37

A Walnut blasting engine De-Coke is used on modern Minis that get gummed up, so to stop this happening rev the dam thing to the red line every so often.

One More Solo · 16 Oct 2013 at 10:41

I Redex'd my car and the next week the clutch cylinder went. Not saying the Redex did it, but the Redex did it.

Minstadave · 16 Oct 2013 at 10:43

eatcustard said:
A Walnut blasting engine De-Coke is used on modern Minis that get gummed up, so to stop this happening rev the dam thing to the red line every so often.

Not sure that works to be honest, look at all the coked up RS4s.

eatcustard · 17 Oct 2013 at 07:17

Minstadave said:
Not sure that works to be honest, look at all the coked up RS4s.

This works on the R56 minis, many have tried it and its worked.

AtreuS · 26 Oct 2013 at 11:31

I saw a bottle on the discount shelf at Tesco for £2.50 so got it and fed it to my 1.8 focus mk1.... after a week I can say it does feel a little more smooth accelerating and idle is now smooth as silk where before it was a little juddery. The car is a 2001 model so I guess a redex every ten years must help lol... there was some smoke for the first 20miles or so then nothing.

Greg0986 · 26 Oct 2013 at 11:43

I used this. Cheaper than redex when I went and bought it and it seems to have fixed the hesitation under acceleration.

atpbx · 26 Oct 2013 at 12:04

eatcustard said:
This works on the R56 minis, many have tried it and its worked.

Using super unleaded stops it happening in the first place.

MarkDavis · 1 Nov 2013 at 00:56

After the Terraclean treatment a few weeks ago, I got the dealer to throw in some Forte fuel treatment and a Forte oil treatment in with oil change. No harm in a cleaner internal engine than a dirtier one...

Been getting some interesting motorway mpg results (measured from fixed junction to fixed junction with cruise set for whole journey):

London<M1>Leicester - 50mpg (60mph)
London<M4>Bristol - 50mpg (60mph)
London<M4>Bristol - 42mpg (70mph)
London<M40>Oxford - 42mpg (70mph)

All an improvement on the pre-treatment mpg. Not bad for 195bhp petrol car!