Heads up Carbon on Porky DI engines

[SFO]

paddyhasneeds said:

Apologies for a bit of a swerve question, but is there any benefit with non-DI 9x7 Pork engines of putting through a tank of injector cleaner every so often or with modern engines that get frequent use with good quality fuel is there simply no need/benefit?

good question, I would like to know the answer too

[Andyuk911]

SFO said:

paddyhasneeds said:

Apologies for a bit of a swerve question, but is there any benefit with non-DI 9x7 Pork engines of putting through a tank of injector cleaner every so often or with modern engines that get frequent use with good quality fuel is there simply no need/benefit?

good question, I would like to know the answer too

There are products around, however I personally don't think they are necessary provided your run Super Unleaded that has more cleaners.

The pictures above show the difference between the 95 BP petrol and BP Ultimate.

Again you pay our money and take your choice.

[Two Stallions]

I always use V-Power, and also put a bottle of Redex/Wynns etc. through every 3000 miles or so. I don't know if it helps, but I feel that it doesn't do any harm, clever marketing!

[Cunny DK]

What happens in the NON DFI engines is that when the fuel is injected into the port area of the manifold it gets sucked into the engine, therefore washing over the back of the inlet valves as a mist. The injector cleaners help this washing process as well as their other benefits.

With the DFI engines the fuel is injected directly into the combustion chamber, therefore no washing takes place on the back of the valves and the deposits start mounting up.

[bluesatin]

So who sells Wynns products- looks like it is from the trade range

[Two Stallions]

bluesatin said:

So who sells Wynns products- looks like it is from the trade range

Halfords sell Wynns injector/fuel system cleaner, blue bottle if I remember correctly.

[paddyhasneeds]

SFO said:

paddyhasneeds said:

Apologies for a bit of a swerve question, but is there any benefit with non-DI 9x7 Pork engines of putting through a tank of injector cleaner every so often or with modern engines that get frequent use with good quality fuel is there simply no need/benefit?

good question, I would like to know the answer too

I guess the question was more whether it could do any harm vs. being a waste of five quid?

[Howitzer]

I remember a product called 10K boost which you spray directly into the inlet.

I used it many moons ago on my 405SRI, I held the car at roughly 2000rpm, sprayed a can directly into the inlet and after the inevitable smoke screen drove the car as normal.

I didn't feel any real difference in driving but did notice when the car came off choke it was much more stable than before.

Dave!

[Ian_UK1]

squeezebm said:

Burrow01 said:

Ian_UK1 said:

DSM2 said:

It isn't just Porsche is it? This applies to all DFI engines.

Yes, it applies to all DFI engines and all diesels.

So how do truck engines covering 500,000 miles get around the problem?

Can someone answer this please


Thank you

They don't!

[baz1985]

Too much Coke heh, I was always perplexed as to why there are legions of DFI Porsches outside rehab clinics. Coat on, in taxi and on my way.

[bordseye]

If the problem is the result of venting crankcase gases / oil mist to the inlet manifold, then why not mod your car to go back to the old system that applied in my yoof of venting to atmosphere ie pipe down the side of the block. Bit like taking the cat off, you might have to temporarily re-connect for the mot but that should be easy

[Mario149]

bordseye said:

If the problem is the result of venting crankcase gases / oil mist to the inlet manifold, then why not mod your car to go back to the old system that applied in my yoof of venting to atmosphere ie pipe down the side of the block. Bit like taking the cat off, you might have to temporarily re-connect for the mot but that should be easy

good question, any answers as to why not?

[Andyuk911]

I suspect it is to do with emissions ..

This vid gives an idea how smart this all is ..

http://www.youtube.com/watch?v=PqZXyHp9cPk

[shoestring7]

Mario149 said:

bordseye said:

If the problem is the result of venting crankcase gases / oil mist to the inlet manifold, then why not mod your car to go back to the old system that applied in my yoof of venting to atmosphere ie pipe down the side of the block. Bit like taking the cat off, you might have to temporarily re-connect for the mot but that should be easy

good question, any answers as to why not?

The car would show an EMS fault; its sensitive enough to trigger when my mechanic cross threaded the oil filler cap.

SS7

[The Stiglet]

Fantastic thread. Was researching about direct fuel injection carbon build up on Audi engines and where best to have them cleaned in the UK. Lots of interesting material here.

[BertBert]

but where are all the stories of 997 engines being de-coked? Or has it not been a problem?

[Andyuk911]

Hi bert,

have a watch, good explanation.

http://youtu.be/PS8riAae_bM

For Porsche, the Cayenne could be bad, however I suspect for 997 Gen II, the oil is of high quality and changed often and the mileage is typically lower. Also the gas recirculation system could be a better design, which would also help.

I would not be put off buying a 997 with a DI engine, after all the IMS issued was solved.

[Ian_UK1]

I started another thread on this subject that has much newer, photographic evidence demonstrating coking isn't a major problem in these engines. This, I freely admit, is completely at odds with my initial concerns (and the known problems generally found in other DFI engine designs). I can only assume Porsche's engineers nailed the design of the oil separator in the crankcase re-breather. Good that they did something right for once!

Thread here:

http://www.pistonheads.com/gassing/topic.asp?t=114...

[Andyuk911]

Agreed, that does look an acceptable level, so no real concern.