glojo said:
is required.
Non CDI diesels are a different kettle of fish, I believe there fuel pumps operate at much lower pressures than the CDI, but I am getting way beyond my pay scale and there are extremely knowledgeable folks on this forum that have worked on the research and development of fuel pumps for the CDI range of engines. They talk far more sense than me, and I have learnt a lot from their contributions. (hence the side of the fence that I sit on)
Regards,
John
John
Where has SE97 indicated that the use of a diesel additive is a bad idea? I'm not saying he hasn't just that I haven't seen it.
It is as a result of the tighter manufacturing tollerances and the higher pressures that a lubrication additive would seem to be a good idea. Common rail pumps are a lot less durable than prevous pump types.
In addition diesel now has a lot less sulpher, especially Sainsbury's City Diesel, which was used as a lubricant before Cats were introduced.
Injector cleaners would also appear a good idea for direct injection injectors due to them having SAC and spray holes rather than a pintle and seat setup.
A pintle will clean the seat of deposits as it operates whereas an injector with a blind end and holes to squirt the fuel cannot clean the spray holes. The heat of the combustion can also cause coking in the SAC.
Be aware that a squiffy squirting injector on a direct injection diesel can cause serious engine damage, such as melted piston, cylinder head or cylinder liner. An indirect engine will not do this due to the method of operation.
Recently I drove a van with a 2.8 litre 4 cylinder Iveco engine. From experience I knew this engine was unballanced at idle when really hot, probably due to an injector imballance at low fuel settings, which is when an imballance will be noticed most.
When I filled the fuel I added a good dose of cleaner. Within 1 mile the engine note became quieter, after a 240 mile trip the imballance was hardly noticeable, most people wouldn't have noticed it at all.
Now I'm not saying it was down to the injector cleaner but...
I would personally use a quality additive in any diesel I owned but as the old saying goes "you pays your money..."
We really need some testing results on additives to be sure.