Series 22- High Performance Fuel Injectors (2017-2025) Milwaukee-Eight®

Description

Fuel Injectors for HD Miwaukee-Eight Engines (2017-2025)

Boost your Harley-Davidson Milwaukee-Eight engine’s power and efficiency with our premium Series 22 Fuel Injectors. Specifically engineered for 2017–2025 models, these injectors offer a significant performance upgrade, accommodating builds from mild street setups to aggressive race configurations.

Key Features & Benefits of our Fuel Injectors for HD Miwaukee-Eight Engines:

• High Performance – Crafted in the USA using advanced injector technology for maximum efficiency and horsepower.
• Matched Sets – Sold in precisely matched pairs to ensure optimal balance and consistent performance.
• Detailed Test Reports – Every injector set includes an individual flow report, tested at 58 psi to guarantee precision.
• Wide Flow Range – Choose from ten available flow rates, from 5.38 gm/sec to 12.6 gm/sec, accommodating various horsepower levels.
• Factory Reference – Stock 2017 Milwaukee-Eight injectors flow at 4.38 gm/sec. We recommend our 6.2 gm/sec injectors for builds up to 145 rear-wheel horsepower (RWHP) at 6,500 RPM.

Injector Sizing Recommendations:

Why Choose Series 22?

Series 22 injectors are precision-engineered to deliver accurate fuel metering, providing smoother throttle response, improved fuel economy, and consistent, reliable power gains. Whether upgrading from stock or building a competitive race engine, Series 22 is your trusted choice.

Why do we use gm/sec as a flow rate?  This is because the Motor Company chose the unit gm/sec to rate their injectors.

How to covert lb/hr to gm/sec.  First you have to determine the pressure that was utilized to determine the flow rate of the injector (very important).

Note: The OE M8 fuel system utilizes 58psi.  The DTT Series 22 fuel injector flow rates are measured at 58psi.  Many fuel injector flow rates are performed at 43.5psi.

If the pressures are the same for the two injectors (both measured at 58psi) , the following formula is used to convert from lb/hr to gm/sec.    gm/sec = (lb/hr) * 0.126

If you use 0.126 as a constant the result is approximate, additional digits provide more accuracy 0.12599788 is the actual value.

How do we come up with the constant 0.126?  By using the formula (453.59237 g_per_lb) / (3600 s_per_hr) =  0.12599788.  453.59237  is the grams in one pound an 3600 is the seconds in one hour.

Remember that the pressure is what typically determines the flow rates (43.5psi vs 58psi) first calculate the new flow rate and then convert to gm/sec.

To convert the new injector flow rate for the new pressure use the formula:  New Flow (lb/hr) = Rated Flow (lb/hr) * sqrt(Actual Pressure / Rated Pressure).

For example:

Rated Flow (lb/hr) = 42
Rated Pressure = 43.5
Actual Pressure = 58

New Flow (lb/hr) = 42 * sqrt(58 / 43.5)
= 42 * sqrt(1.3333333)
= 42 * 1.15470054
= 48.497421 lb/hr @ 58psi

New Flow (gm/sec) = 48.497421 * 0.12599788
= 6.101 gm/sec @ 58psi

• To convert from cc/min to gm/sec, the conversion is similar, use these formulas.

New Flow (cc/min) = Rated Flow (cc/min) * sqrt(Actual Pressure / Rated Pressure) and g/s = (cc_per_min × fuel_density_g_per_cc) / 60

For example

Rated Flow (cc/min) = 500
Rated Pressure = 43.5
Actual Pressure = 58

New Flow (cc/min) = 500 × sqrt(58 / 43.5)
= 500 × 1.15470054
= 577.35 cc/min @ 58psi

g/s = (cc_per_min × fuel_density_g_per_cc) / 60

g/s = (577.35 × 0.745) / 60
g/s = 429.72 / 60
g/s = 7.162 g/s

note: cc_per_min = inj flow rate cubic centimeters per min (cc/min), fuel_density_g_per_cc = fuel density in grams per cubic centimeter (g/cc) for gasoline this is typically 0.745 g/cc @ 15 C and 60 = number of seconds in a minute used to convert from gm/min to gm/sec.