S&S Diesel Motorsport Injectors (2011-2016 6.6L Duramax)

Fitment

Fits 2011-2016 Chevrolet Silverado 2500HD and 3500HD and GMC Sierra 2500HD and 3500HD with the 6.6L LML Duramax, including 3500HD single- and dual-rear-wheel trucks. The LML only went in heavy-duty pickups; no 1500 got it. GM's LGH van engine shares the CP4.2 pump but uses a different calibration and different hardware around it, so do not assume pickup fuel parts carry over. This listing is for LML pickups. Verify by VIN or call us if you are unsure.

Why this part

On the LML, injector trouble usually starts at the pump. The piezo injectors are expensive but generally reliable, and damage to them is almost always secondary to a Bosch CP4.2 failure. When the fuel film thins from water, air or low-lubricity fuel, the pump's cam and roller wear and send metal through the rails, the high-pressure lines and the injectors. Failures have been documented as early as 30,000 miles and average around 100,000, while some pumps pass 700,000. Because the debris lodges in the injectors, GM and shops replace all eight along with the rails and lines.

A full repair after a pump failure covers more than injectors: the pump, both rails with sensors, all high-pressure lines, a filter service kit and seals, plus a tank drop-and-clean and a line flush. Call us and we will scope the whole job, not just the injector side.

S&S builds every LML set the same way. Nozzles are honed with a proprietary process for clean, consistent holes and flow-matched to 1% variance per set to OE standards. Except for TorqueMaster, the finished injectors are flow-matched to 3% variance per set at four pressure and energizing points per injector, with the injection profiles (rate shape) aligned. The build spec for each size is matched to its nozzle flow rate and includes internal modifications, the piezo mod.

If you are stepping up in size, keep the fuel supply in mind. The stock CP4.2 is the limiting pump on the LML, so pair larger injectors with a lift pump. S&S also builds a CP3 conversion kit for the LML that carries CARB EO D-756-4 and needs no tuning. Whatever size you run, protect the new set: use a lubricity additive every tank, keep the tank above a quarter and never run it dry, change the fuel filter every 10,000 miles and cut the old one open to look for metal.

What you get

A flow-matched S&S LML injector set in the size you select, with one part number per size: LML-10SAC, LML-30SAC, LML-45SAC, LML-60SAC, LML-80SAC, LML-100SAC, LML-150SAC, LML-200SAC, LML-250SAC and LML-300SAC.

Options (from S&S)

• The industry has adopted a % increase in nozzle flow over stock as the sizing convention
  • Available sizes: TorqueMaster, 30%, 45%, 60%, 80%, 100%, 150%, 200%, 250%, 300%

Core returns required – $150 charge if no core returned.

Specifications

S&S Upgrades

• Proprietary nozzle honing process for clean and consistent holes
• Nozzles flow-matched to 1% variance per set, using OE standards
  • Viscor SAE-J967
  • 40 degrees C
  • 100 bar
• Injectors flow-matched to 3% variance per set (except TorqueMaster)
  • Viscor SAE-J967
  • 40 degrees C
  • 4 different pressure/energizing points per injector
  • Injection profiles (rate shape) aligned
• Injector build spec custom-matched to nozzle flow rate for each size, which includes internal modifications (piezo mod)

About S&S Diesel Motorsport

S&S Diesel Motorsport makes injectors, CP3 high-pressure pumps, CP3 conversion kits and CP4 solutions for common-rail Duramax, Cummins and Power Stroke engines. For the 2011-2016 6.6L Duramax that means a CP3 conversion kit as well as these injectors. It is hardware built to put a fuel system right, whether the truck needs a stock replacement or a fix for a known weak point.

Frequently asked questions

Do I need new injectors after a CP4.2 failure?

In most cases, yes. Pump debris lodges in the piezo injectors, so GM and shops replace all eight along with the rails and lines. Call us before you order and we will help you scope the rest of the repair.

Will the stock pump keep up with larger injectors?

The stock CP4.2 is the limiting pump on the LML, so larger injectors should be paired with a lift pump. Tell us the size you want and how the truck is used, and we will walk through the fuel supply side with you.

Is there a core charge?

Yes. Core returns are required. If no core is returned, a $150 charge applies.

Questions on fitment? Call the shop at the number in the header. We install everything we sell.