Heads up Carbon on Porky DI engines
Discussion
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 tooSFO 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 tooThe pictures above show the difference between the 95 BP petrol and BP Ultimate.
Again you pay our money and take your choice.
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.
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.
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 tooI 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!
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!
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.Thank you
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
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?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
This vid gives an idea how smart this all is ..
http://www.youtube.com/watch?v=PqZXyHp9cPk
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?SS7
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.
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.
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...
Thread here:
http://www.pistonheads.com/gassing/topic.asp?t=114...
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