Diesel Fumes and Injectors

[Rich]

Couple of queries!

Will the later 2 stage injectors fit a diesel engine with the single stage injectors?

The reason for this is I have been trying to work out why I am getting so much smoke out the exhaust, a friend suggeted I remove the pipe from the PCV valve to the the air filter, and see if that makes things better. He also told me that one of the injectors is definatly leaking, but they cost about £60 each! :worried:

I did remove this pipe however, and yes, it does seem better, but I am slightly concerned about the amount of fumes and smells and stuff coming out of this pipe I have taken off, and it smells like the exhaust used to. It it normal for this pipe to be spouting so much rubbish?

Thanks, Rich

[dutch-van-driver]

In theorie this should work and I know E_T_V is also interrested. I'm not sure which pipe you mean. Mostly because of the language difference.

Back to the injectors: The 2 stage stuff is in the injector and not in the pump.

Marc

[Rich]

It goes from valve on the oil filler cap to the air filter. I have taken it off the air filter end, and plugged the hole!

[dutch-van-driver]

Ok,

As far as I know and I'm no expert this pipe should not be blokked. This should release the pressure under the piston's. It looks maybe like it is "pumping" some motor oil in the airfilter (which gets burned in the cylinders). How is the Oil-buring/usages of the engine?

I noticed a much higher oil-usage with high speeds on my car. I'm not sure how to solve this.

For the injectors: Why don't you go to a scrapyard to look for some spares?

Marc

[skipweasel]

Ok,
I noticed a much higher oil-usage with high speeds on my car. I'm not sure how to solve this.
Marc

Drive slower! All the cars I've ever driven use more oil at higher speeds.

As for the injectors - if they do work you'll also need the injector pipes 'cos the supply goes in in a different place. You'll need the leak-of pipes as well.

The pipe you've taken off is the crankcase breather - it's necessary. By blocking it you're increasing the pressure in the crankcase and sooner or later something else will pop out to release it. If there's a lot of smoke coming out of the oil filler hole when the engine's running then you've got either worn bores, broken rings or possible worn valve-guide seals.

[E_T_V]

If the 2 stage bit is indeed in the injectors (as I suspected) then retro fitting the 2 stage injectors from a later car will make the engine more fuel efficient and quieter. I think the 2 stage ones were only fitted to the turbo diesels which might be an issue but I think it can be done still.

The PCV valve thingy is a mystery to me too, but from what I can gather the crankcase does run at a pressure probably to reduce oil consumption, but the valve regulates the pressure so that it doesn't get too high and burst oil seals. I'd leave it be for the moment. My old injectors on my diesel also leaked, and the oil consumption wasn't great but no worse than the turbo diesel I've replaced it with.

Is the smoke form the exhaust blue or black? If it is black then maybe you have a worn injector, or a blocked one, if it is blue (as my old diesel was) then you'll just have to live with it like I did, they do tend to smoke a lot. If you are at knebworth then we can compare notes as hopefully the camper will be there.

[dutch-van-driver]

Hi,

I'm not sure if the 2 stage make a car more fuel efficient (I think even that it is making it a little less efficient). I have seen somewhere that it is only used to make a directly injected diesel a little less load (sound wise).

By injecting a little diesel in the chambre before the top is reached it tries to make the "bang" "longer". Thinking about this it could be that you need another timing setting for the pump. It needs to start a little later so the most fuel still reaches the injector at the "optimum" moment. They also need to inject a little more for the same performance.

I'm not sure where I read it but E_T_V did you read the article I send you a few months ago about the 2 stage injectors in a VW TDI engine. I don't know if I have a reference to it anymore.

Marc

[E_T_V]

I think I remember reading that article somewhere. Basically the technology (rather basic by todays standards) is in the injector. The injectors are triggered by the pressure of fuel the pump supplys. The injectors simply have two valves in them, which open at slightly different pressures leading to the prolonged "bang". It was invented to give less noise in direct injection diesels as you said, but In reality I doubt it would have any noticable effect at all on fuel consumption. I think the pump is the same for both types of injector, (and is indeed the same pump on the turbo and non turbo versions), but someone can check that out on the parts catalogue.