Quick Answer

Quick Answer: What will 4k governor springs do for my 12v Cummins?

The Industrial Injection 4000 Governor Spring Kit is by far the best modification you will ever do to your 12 valve Cummins engine. The factory governor generally will slowly start to defuel the engine around 2300-2400 rpm and drastically decrease performance and pulling power.

What does a heavier valve spring do?

Simple physics tells us that heavier objects require more force to accelerate, just like a heavier car requires more horsepower to accelerate. Adding larger valves means the valvespring must control additional weight, more than likely at higher engine speeds.

How do I know which valve spring to use?

Most manufacturers will recommend valve springs to go with each camshaft they make. We recommend the same springs listed by the camshaft manufacturer, or a spring with similar specifications. Understanding the spring specifications will help you select the right springs for your engine.

What do valve springs do in a Cummins?

It increases the time delay from start of injection to start of combustion, it decreases the maximum pressure and maximum temperature reached in the cylinder and it increases the total time needed to completely burn the available fuel. Correct valve spring pressure is a very important piece of power production.

How do you do governor springs on a 12 valve Cummins?

How to Install Governor Springs in a Cummins | Power Driven Diesel

How do I install governor Springs?

How to Install Cummins Governor Springs

  1. Remove battery cable, horn, shutdown solenoid, and actuator arm.
  2. Remove old governor springs (Leave large outer spring in place)
  3. Install new governor springs (Install them as a single unit for ease)
  4. Repeat for second set of springs and reassemble engine parts.

Can you have too much valve spring?

But can a valvetrain ever have too much spring pressure… yes, definitely. A normal flat tappet cam core is limited to about 145-155 pounds seat and 400-pounds open pressure.

Are stiffer valve springs better?

Well, the spring is only responsible for closing the valve, not opening it. And a stiffer spring would only change the way the valve acts if the stock springs aren’t stiff enough to keep up with the cam profile (i.e. they’re floating).

How much spring pressure do I need?

To prevent the valves from bouncing on the seat, elevated seat pressures are required. Street-strip cars should aim for ~175-200lbs seat pressure. Mild race applications need 225-250lbs on the seat. Professional level racing require ~350lbs seat pressure or more.

Does valve spring order matter?

The spring is selected to complement the system and must be matched with the entire valve train in order for the engine to reach its full potential. It does absolutely no good to install a cam that will rpm to 8000 if you do not have the correct springs.

How do I know if I need a new valve spring?

By the time original equipment valve springs have 100,000 or more miles on them, they have probably lost up to 10% or more of the tension they had when they were new. Most engine experts recommend replacing valve springs that have lost 10 percent or more of their original tension.

What happens when valve spring tension is too low?

If the spring pressures are too low, a condition called “Valve Float” will occur.

How do I get more power out of my 12 valve?

Double The Horsepower of Your 12 Valve Cummins | Power Driven

Why is the 12v Cummins so good?

What made the Cummins so popular was the fact that its peak power and torque was insanely usable—in fact, the redline is only at 3,000 RPM! The 12-valve was able to get respectable fuel economy while producing torque figures never-before seen in an ordinary pickup truck.

What was the last year for the 12 valve Cummins?

1994-1998 12 Valve 5.9L Cummins Specs

The term 2nd generation Cummins refers to Dodge diesel pickups between 1994-2002. There are two variations of the 2nd gen Cummins though. 1994-1998 trucks feature 12 valves and are very similar to the previous trucks engines.

How do you adjust valve spring height?

Two Minute Tech: Measure Valve Spring Installed Height

How do you check valve spring pressure?

Measuring valve springs

What is valve spring installed height?

The installed height of a valvespring is the distance from the base of the spring to the bottom of the retainer when the valve is closed. If the distance is too short the spring will be under too much tension, and if the distance is too great the spring will want to “dance” around.

How do you match valve springs to cam?

An important factor when selecting valve springs, is choosing the correct seat pressure, open pressure, and spring rate for the camshaft being used. In theory, you can gain free horsepower just by choosing the proper springs for your engine.

How do I know if my valves are floating?

How is it identified?

  1. Mild valve float can be felt as power falling off quickly at high rpm.
  2. Severe valve float will be heard as a sputtering sound at peak rpm.

How often should you change valve springs?

This is about every 2 to 3 years, 1/4 mile racing. If you change them on the engine, do one cylinder at a time and bring that cylinder up to TDC so you don’t have to worry about dropping a valve down too far.

What are symptoms of weak valve springs?

Broken or weak valve springs in an engine can cause many different drivability and performance problems. Broken valve springs cause excessive valve noise, compression loss and can cause severe internal engine damage.

How do you adjust valve spring pressure?

Quick Tech: Proper Valve Spring Set Up

How do you calculate coil springs?

To calculate the amount of spring rate you will need on order to meet your working loads, simply divide the load you will be applying on your spring by the distance you expect your spring to travel or compress under that load.