Quote:
Originally Posted by JarrardB
Hmm, not as severe as that - more like oil than carbon.
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I suspect you are talking about the intercooler hose end. In which case it is no where near as bad there as it will be down in the manifold. Those pics are on the inlet ports themselves. If you look down the inlet you will see a venturi pipe, it actually bolts into the manifold and looks like a blanking plug from the outside. This point is where the EGR is introduced. Before this point you should just be seeing oil blowby (sounds like your comment). After this point you will have something like mine depending on how bad it is. Mine had about 168k on the clock when I cleaned mine. If you want to test it get a cheap pipe or borescope type camera or get a wire rod with a bit of rag securely secured to the end and have a poke around further down. Even a thin bit of sheet metal say 10mm wide, 1mm thick (colorbond even better .55mm) with a little bent over hook end and have a scrape around. Mine had a good 5mm coating all around the ports right down into the head at the valve. So you can imagine how detrimental to efficiency a reduction of the inlets by 10mm could be. Not to mention how bad airflow would be as it's all bumpy and lumpy.
The result is the oil mixing with the soot and it's best described as tar like. Incredibly thick and sticky and certainly not what you want the dog walking in when snooping around the back of the shed if he is allowed inside the house like ours. ( A very dark day in our household that day)