Cummins 12 Valve 4000 Gov Spring Kit
SKU: 232701
Product Description:
4K Governor Springs for Bosch P7100 Injection Pump (12v Cummins)
Increase your engine’s RPM capability and unlock more top-end performance with 4K Governor Springs for the Bosch P7100 injection pump. This performance upgrade allows 12 valve Cummins engines to rev to approximately 4,000 RPM, extending the usable powerband and supporting high-performance diesel builds.
The 4K governor spring upgrade is a popular modification among diesel enthusiasts, racers, and performance builders who want their P7100 injection pump to maintain fueling at higher engine speeds. When paired with upgraded injectors, turbochargers, and fuel system modifications, these springs help maximize horsepower potential and improve throttle response.
Designed for reliability and consistent governor operation, these springs are ideal for performance trucks, competition vehicles, and modified street setups.
Key Features
Raises RPM Limit to ~4,000 RPM
Allows the engine to maintain fuel delivery at higher RPM levels compared to the factory governor setup.
Designed for Bosch P7100 Injection Pumps
Compatible with the mechanical P7100 injection pump used in 12v Cummins diesel engines.
Improved Performance and Powerband
Helps extend the usable RPM range, improving acceleration and top-end performance.
Performance Diesel Upgrade
Ideal for high horsepower builds, racing applications, and modified street trucks.
Durable Spring Construction
Manufactured from high-quality materials designed to perform reliably in high-demand diesel injection systems.
Important Installation Note
For engines running 4K governor springs, it is recommended to upgrade to 150 lb valve springs to help prevent valve float at higher RPM levels. Upgrading valve springs helps maintain proper valve control and ensures reliable engine operation when increasing the engine’s rev limit.
Applications
These 4K governor springs are commonly used in:
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12v Cummins performance builds
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Diesel drag racing trucks
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Sled pulling trucks
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High horsepower street trucks
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P7100 injection pump upgrades
Vehicle Compatibility
Compatible with engines equipped with the Bosch P7100 injection pump, including:
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1994–1998 Dodge Ram 2500 12v Cummins
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1994–1998 Dodge Ram 3500 12v Cummins
Benefits of Upgrading to 4K Governor Springs
Installing 4K governor springs allows your engine to maintain fueling at higher RPMs, which helps support performance modifications and keeps the engine in its optimal power range.
Benefits include:
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Higher usable RPM range
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Stronger top-end power
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Improved throttle response
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Better performance with upgraded injectors and turbochargers
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Increased tuning flexibility for performance builds
Product Highlights
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4K Governor Spring Upgrade
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Raises RPM limit to approximately 4,000 RPM
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Designed for Bosch P7100 injection pump
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Compatible with 12 valve Cummins engines
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Ideal for high-performance diesel applications
Free economy ground shipping on most orders over $200. This includes lower 48 United States only. Excludes products that must ship freight.
Read Carefully!
When you purchase a product from our website that has a core requirement, you have two options:
1. You choose to pay the core charge and we will ship the product right away, then once we receive the cores you will be refunded the core charge if your cores pass our inspection qualifications. This is the preferred choice and has the least delays.
2. You choose to send in your cores before we ship the product that was purchased. This choice has the risk of delayed shipment of your purchased product and our inventory is not guaranteed by the time we receive your cores. You will need to follow all of the instructions below as quickly as possible so that you can get your purchased product and we can receive the cores. When you choose this option you acknowledge that by the time we receive your cores, our inventory could have change and there could be a delay in your shipment.
Please return all cores to:
Industrial Injection Core Returns
2858 South 300 West
Salt Lake City, Utah 84115
INCLUDE RA# THAT WAS ISSUED AT TIME OF PURCHASE! If RA # is lost, please call Customer Service at (800) 955-0476. Have your original invoice at time of phone call to give all appropriate information for return.
Core return freight is the responsibility of the customer
FULL CREDIT WILL BE GIVEN WHEN:
In order to receive full core credit, your core(s) must be returned within 90 days from receipt of order. It must be as is “off the engine.” Full core credit will be given if core meets acceptance criteria. Cores that are damaged during shipment to Industrial Injection are the responsibility of the customer and their shipping company.
½ CORE CHARGE CREDIT WILL BE GIVEN WHEN:
- Slightly damaged housing or camshaft
- Missing parts such as FCA
No Core Credit issued when:
- Core is seized or hydraulic head is cracked
- Excessive damage ( Heavy use of Bio-diesel and rust are common causes for unacceptable core)
- Core is fire damaged
- Core is returned after 90 days/3months
Please do the following when returning a core:
- Make sure you have removed all fittings from your old unit
- Drain all fuel and oil from unit
- Package cores so that fuel and oil does not escape from the package
NOTE: packages that have fuel or oil residue on the outside of the box during shipping will not be delivered by UPS or the postal service which will cause delays.
- Please re-use boxes and bags that parts were shipped in originally. These boxes are UPS approved to reduce damage while being handled in freight.
- All shipping charges are the responsibility of the customer
- Please write on the box “Core Return” and have RA # clearly written on the outside of box
- Include copy of original invoice and RGA inside box
PLEASE RETAIN RA#, INVOICE # AND TRACKING NUMBER UNTIL CREDIT IS RECEIVED BY YOU. We do not research by customer name, only invoice # or RA #.
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