Zitat von der Pro-oiler.net Webseite zum hier sogenannten Dualinjektor:
3. Why is a twin nozzle better than a single nozzle?
This is a BIG issue!
To explain this you need to bear in mind that there are basically 3 aspects to lubing a chain:
1. The most important point is to get the oil into the bushing and roller. This is the area where the wear occurs, resulting in chain "stretch" - the play between the inside of the rollers and the bushing increases. Lack of lubrication here is damaging to the chain - and is the main reason why spray-on lubricants can't match the performance of continuous lubrication from a chain-oiler.
2. The o-rings also need lubricating to reduce heat build-up through friction, and also to prevent degradation from UV radiation and chemical in road grit which are aggressive to NBR rubber. To test the amount of resistance o-rings can generate on their own, here's an easy and safe experiment:
· Spin the wheel by hand when the chain is dry and gauge the resistance. This can often be so strong that it needs a lot of effort to do.
· Then take a can of WD40 and quickly spray the chain o-rings on each side (not the rollers - we're isolating the effect of friction in the orings here). The wheel will instantly turn more freely - due almost entirely to the reduced friction between the o-rings and the plates. (Don't worry, WD40 does no damage to o-ring seals!)
3. Corrosion protection for the side-plates. In reality more of a cosmetic issue, but still a point - a rusty chain is not a pretty sight!
Gravity feed chain-oilers have been using a single nozzle for years, so what's the problem?
· A single nozzle setup only lubes one side of the chain. The really important job of getting oil into the bushing/roller area is achieved just as effectively by single as by twin nozzles - the oil is sucked in by capillary action.
· The pair of outer plates and o-rings (the ones furthest from the wheel) will also be lubed because you are depositing the oil onto the plate next to the sprocket. However, the plates on the chain run next to the wheel may not be receiving enough oil to provide any corrosion protection, and much more serious - not even lubricate the o-ring.
· The only way a single nozzle setup can get oil to the plates and o-rings next to the wheel is by being set rich - then the oil gets to this area by means of aerodynamic turbulence - the swirling air literally does the job of coating the chain with oil. Fling-off is being left to do the job!
· On a gravity feed system the oil deposition is varying all the time with temperature and speed changes - at high temperatures more oil is flowing, and at low speeds one and the same setting will be too rich
· This rich running is all part of life with a gravity feed system, but it does mean that on average the inside links and o-ring should be well lubed - but the price of this is a lot of fling-off
· The PRO-OILER's delivery does not vary in this way, so a single nozzle on a PRO-OILER needs to be set rich enough so that turbulence gets the oil to the inner links and o-rings. This somewhat defeats the advantages of the PRO-OILER's efficient delivery!
· The double disadvantage here is that if you run a PRO-OILER with a single nozzle at low speeds, there won't be enough turbulence to distribute oil to the other side of the chain - this "distribution" will only occur at higher speeds.
· A very simple experiment can demonstrate this:
· Run the chain fairly dry at low speeds for 50+ kms (so that you can see a clear difference between the condition of the outer and inner plates and o-rings)
· Then go out on the open road at 120km/h or more for 50kms. You will see the chain is more evenly lubed after running at higher speed.
The answer to the whole problem is to use a twin nozzle setup
· Then a lean setting can be used
· The entire chain gets just enough oil to lube and protect it, but with a minimum of fling-off. Turbulence plays a much smaller rôle in getting the oil to where it needs to be - it's only really a factor in coating the outside of the outer links.
Advantages all round, and the reason that PRO-OILER strongly encourages wherever possible the fitting of a twin nozzle setup - and why the twin nozzle is included as part of the system.
Tja, wie man lesen kann, gibt es halt nicht nur die eine Meinung von Hobbit, der es ja als psychologische Hilfe abtut, ohne es wirklich zu begründen, sondern auch andere Sichtweisen mit Begründung. Dies nur der Vollständigkeit halber.
Dirk