Archives: mechanical fuel injection

Good Fuel Pressure with a New MFI System

Setting up a new MFI fuel system: main bypass adjustment to control the air/fuel ratio adjustment of the combination of the main bypass and nozzle sizes to maintain an optimum fuel pressure range from the lowest to highest engine RPM. Changing the main bypass jet for tuning affects the air to fuel ratio and fuel […]

Solutions to Idle Lope in Mechanical Fuel Injection

Customer Inquiry One of our customers recently inquired about idle lope in his funnycar dragster.  ‘What can I do to minimize idle surge on our funny car?  It’s difficult to stage at the starting line.  It has a Bruno (torque converter), Lenco transmission, Enderle Bird Catcher fuel injection hat, Enderle K type barrel valve with […]

Rons Low Cost Throttle Body Fuel Injection CFM & HP Capabilities

Rons Fuel Injection has provided us with air flow data for their throttle body setups.  We analyzed the power potential of these simple and very popular fuel injection systems. Racing engine size capabilities were determined at the flow CFM numbers provided by Rons Fuel Injection.  For 100% air density, horsepower capabilities were also determined. Rons […]

Fuel Injection Evolution

Mechanical fuel injection is holding its own against EFI and racing carbs in racing. It is simple, lower cost in many applications, and good for fuel pressure increases for more response & power. One recent application tested racing carbs, EFI, and mechanical fuel injection all on the same racing engine. Another recent application tested mechanical […]

Idle & Low End Air/Fuel Ratio Tuning Tool, Flared/Radiused Jet Orientation

We are now developing techniques using our jetting calculator to set up idle air to fuel ratio for really good MFI racing engine tuning.  Idle settings in many MFI racing engines are key to superior performance from engine temperature and off idle response. That is done by adjusting the combination of idle vacuum (throttle blade […]

Fuel Injection Setup & Tuning

… by Experience & Gut Feel Throughout the racing community, experience and gut feel are the most common methods for the selection of nozzle and jet size numbers for setup and tuning of mechanical fuel injection. It is a form of iteration or ‘connecting the dots’. Given enough time and expense, experience from good and […]

Uniform Standard of Units

Throughout our publications, air intake and fuel delivery values are converted to a ‘uniform standard of units’. That is “pounds per revolution”. The tuning demands for weight of air and weight of fuel become easy to understand, record, and analyze with that numerical value. And easy to change in fine tuning increments with this simple […]

MORE ON BRACKET RACING TUNE-UP FOR FUEL INJECTION

Question: How did you dial in your mechanical fuel injection setup for bracket racing? Answer: Our tune-up is set up to be in a linear range. That is when we increase the shift point, our ET is proportionately lower. When we lower our shift point, our ET is proportionately higher. That is a result of […]

ET BRACKET DRAG RACING WITH FUEL INJECTION

Question: Is it difficult to bracket race with mechanical fuel injection compared to carburetors? Answer: (I) I met an interesting competitor in IHRA when I was writing the TECH STOP who ran an injected normally aspirated small block. It was set up by Kinsler. He said he never has to change a jet or make […]