Even a small thing like a diesel injector nozzle can affect the performance of your car. The lower the fuel mass an injector nozzle produces-or sprays to the cylinders-the less horsepower the engine has. But a more pressing problem when it comes to diesel injectors is the accumulation of carbon deposits in the injector nozzles. Even though there are four to six injectors in a car, the shortcomings of one clogged nozzle cannot be compensated by the functioning others. If your car has been hinting you of poor horsepower output, then it might be time to shop for new injector nozzles to bring it back to its giddyup speed.
What specs to check for: injector flow, hole size, hole number
There are three specifications that you should be aware of when buying new injector nozzles. These nozzles are rated using two numbers with a multiplier in between; the first number is the number of holes in the tip, while the second number is the size of the hole measured in thousandth of an inch in diameter. For instance, a 7x12 rating indicates that the nozzle has seven holes with each hole measuring 12 thousandths of an inch in diameter. This particular nozzle gives 55-horsepower, 275cc, and 91 pounds per hour of fuel mass. So, six fuel injectors can produce 220-horsepower, which is above that of a Ford Escort and 100-hp less that of a Mitsubishi 3000GT.
Which type to choose: pintle, disc, ball
There are generally three kinds of injector nozzle tip. The most common one is the pintle, which has a protruding extension through the hole of the nozzle's body; it has also been used for more than thirty years. Buy this type if you want greater fuel penetration into the combustion space. The disc type uses the same mechanism as the pintle, but it has a flat disc and a multi-holed plate. Choose this type for its good spray pattern, but its design does not prevent clogging. Opt for a ball type with a ball-and-socket design for its great spray pattern and atomization, but same with the disc type, it can be clogged by deposits.