How do you time an injection pump?

Published by Charlie Davidson on

How do you time an injection pump?

If you decide to alter the fuel injection pump, you’ll need to:

  1. Use a socket wrench on the front camshaft bolt to hand-turn the engine clockwise until the first cylinder is at TDC.
  2. Both the intake and exhaust valves should be closed, and the TDC mark should be aligned.

How do you check fuel injector timing?

By removing deflector from fuel pump

  1. Take out deflector on both sides of the fuel pump.
  2. Put hand torch on one side of pump and mirror on the other side.
  3. The light from torch will be visible on the mirror.
  4. Turn the engine so that the unit to be check is toward the TDC of compression (at plunger upstroke)

What is fuel injector dead time?

The “dead time” is just the amount of time from closed to opened that a certain sized injector takes to open under a certain, voltage and fuel pressure, and to be honest is NOT THAT IMPORTANT in reality, it’s one of those “fine tuning” things tht keeps a steady idle at night or when there’s a load on the electrical …

What is injector on time?

Injector pulse width is the amount of time, measured in milliseconds (ms), that a fuel injector stays open (delivers fuel) during a cylinder intake cycle. The typical injector pulse width for an idling engine at normal operating temperature is between 2.5 and 3.5 ms.

What causes injector pumps to fail?

One of the major reasons for injector pump failure is an excessive buildup of deposits. There are two types of deposits – internal injector deposits and external injector deposits. External injector deposits are caused by fuel that’s not wholly burned that often builds up around the injector holes.

How do you test an injection pump?

The inj pump does all the really hard work of delivering the fuel to the cylinders via the injectors. To test the lift pump, once the engine is running, open the bleeder at the fuel filter. The engine should stay running and the fuel should really squirt out.

How important are injector dead times?

Having accurate injector dead time settings (also known as injector lag time or latency) is critical for a quality idle as well as maintaining air/fuel ratios when there are lots of accessory loads on the engine (ie: headlights, heater, etc.).

How do I increase the flow of my fuel injectors?

Increasing fuel rail pressure to get more through your standard injectors.

  1. Fit larger injectors – which can be very expensive;
  2. Add an ancillary injector – which can cause fuel distribution problems when the manifold is then required to flow an air/fuel mix, not just air;

How do you set injector latency?

How to Set Injector Flow-Rates and Set Injector Dead Times

  1. Do a full tune using stock/OEM injectors with OEM injector dead times.
  2. Turn off all accessories (headlights, heater, stereo, etc.)
  3. Hold the throttle steady at 3,000 rpm after tune is complete and take note of your air/fuel ratio.

What can cause fuel injectors not to spray?

If it does not spray, the problem is the injector or no fuel pressure. The injector should have around 1.3 ohms of resistance, if it is open or zero resistance, it is bad. The injector could be totally clogged as well. Fuel pressure should be 9 to 13 psi.

What is the lag time on an injector?

Injector “lag” time is the time it takes for an injector to open (OT) form the time it has been energized until it is fully open. There is also a close time that you do not hear about very often (CT). Some engine managment systems require you to enter this time and refer to it as injector lag, latency, delay or other terms.

What happens when you change the injection pump timing?

Over time, the injection pump timing retards, resulting in problems, such as: Making the proper adjustments can get the system back to its original performance levels or better. Be aware that upping your engine’s power isn’t always the right move. Sometimes, more power can result in excessive smoking from the exhaust and delay boost.

How does the injection delay affect the time of combustion?

Injection delay is the interval of time from when injection begins to the start of combustion — meaning it directly relates to timing. The period of suspension involves both physical and chemical intervals that coincide. The breakdown of atoms, vaporization and air-fuel mixing delays the process, as does the combustion reaction.

How does the period of suspension affect the injection time?

The period of suspension involves both physical and chemical intervals that coincide. The breakdown of atoms, vaporization and air-fuel mixing delays the process, as does the combustion reaction. When you advance the timing, it decreases the injection delay, but when you retard the injection, it increases the interval.

Categories: Users' questions