Injector Points
A performance EFI system is only as reliable and powerful as its injectors. Elaborate management systems are useless if the injectors cannot accurately meter the fuel delivery on command. MSD's Competition Fuel Injectors will control the fuel flow correctly and reliably every time. Our injectors are engineered to racing specifications and are available in flow rates appropriate for engines producing 250 - 1,300 horsepower.
MSD Competition Fuel Injectors Feature:
- Stainless steel ball and seat metering method creates maximum internal sealing.
- MULTEC metering design produces superior fuel charge flow for consistent fuel delivery at any rpm.
- Six hole injector metering orifice produces totally atomized and compact 10°-15° spray pattern.
- Fuel flow rates are set and calibrated during manufacturing to ensure precise flow rates.
- Recessed delivery holes resist fuel clogging and injector formation so no cleaning is required.
Alcohol Fuels
MSD Competition Fuel Injectors are compatible with alcohol-based fuels. When using 100% methanol, the entire fuel system should be flushed with mineral spirits or gasoline to purge the methanol after every race. Any residual methanol will harbor water that will corrode any part that isn't stainless steel.
The internals of MSD injectors will withstand long term use with alcohol fuels, but the external O-rings will swell after prolonged use. Keeping a few spare O-rings (PN 2100) is inexpensive replacement insurance. Remember, that using methanol fuel requires about twice the comparable fuel flow of gasoline. Therefore, double the injector size when determining the correct injector required.
Bigger Isn't Always Better
Stock, street driven EFI engines using an O2 feedback, closed loop control system rarely exhibit a performance gain simply by installing higher flowing injectors. During closed loop operation, the stock ECU will try to adjust for the greater amount of fuel being delivered. If the replacement injector is not too large (about 10 - 20% greater flow at most) the ECU might be able to make the correct compensation.
If the induction system has been left stock and the ECU cannot compensate for the increased fuel volume, unburned fuel will all but pour into the exhaust. This in turn will cause the Check Engine Light to come on, the catalytic converter could overheat and other problems will occur. In applications looking for just a little more performance it my be easier and more cost effective to raise the fuel system pressure to get a 10%-20% fuel flow increase at the injectors.
Remember that installing larger flow injectors only has technical merit if substantial modifications have been made to the entire induction system. Plus, the stock ECU will undoubtedly have to be re-programmed for the increased injector fuel flow.
Balancing Injectors
There is some performance merit in matching or balancing injector flow rates among cylinders on a stock engine. MSD Competition Fuel Injectors have been balanced to a flow rate tolerance between individual injectors of the same static (wide open) flow rate of 1.5 - 3%. This close tolerance is particularly useful in high performance racing engines where maximum performance for each cylinder is required.
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