Rons Fuel Injection provided MFI throttle body flow data so that we could analyze the power potential of these low cost, simple fuel injection systems. Racing engine sizes and horsepower potentials were determined at these flow cfm numbers for 100% air density, and are included. Rons FI MFI Toilets 3-3/4″ = 1240cfm: can feed 595 […]
Engler Stumble Valve A recent provision from Tim Engler is his stumble valve. It is a normally open bypass valve that closes with pressure. Note: Most conventional fuel injection bypass valves are normally closed and open with pressure, such as for a high speed lean-out function.
Blower Sizing Review An example is provided for an 8,000 RPM Roots blower speed. That would be for a blower drive ratio at 1-to-1 on an engine spinning 8,000 RPM. It could also be for a blower overdrive ratio at 1.333-to-1 or 33.3% over for an engine spinning at 6,000 RPM. The 6-71 Roots […]
Restricted Fuel Pump Sizing with Inlet Restrictors Certain racing classes specify fuel pump flow value limits. The common way to achieve this is fuel pump size. However, another way to achieve this is to restrict the fuel pump inlet using a larger fuel pump. When this is done, it cavitates the fuel pump, limiting the […]
Outlaw ProMod drag racing setups with mechanical fuel injection are hitting over 4,000 horsepower. The oversize PSI screw blowers at high overdrive ratios are common. These are not legal in most national drag racing classes. But in eighth mile outlaw racing, they are common. Horsepower levels in the 3,000’s are typical on the launch with […]
We’ve been trying our hand at recording video! Hopefully it gives viewers a glimpse into what kind of books we provide. Check out our latest video for our book, Blown Nitro Racing on a Budget: You can learn more about this book in our store!
Recently, we did an analysis of fuel velocity coming out of a mechanical fuel injection nozzle. Fuel velocity is a function of fuel pressure. Higher pressures make higher fuel velocities. We found that fuel velocities from common fuel pressure ranges were below the port air velocity in normally aspirated engines. This could explain why, in […]
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 […]
Mechanical fuel injection (MFI) is the standard in many racing categories such as drag racing, circle racing, high speed events, and slalum. All of these have restrictive rules that affect MFI setup & tuning. Top Fuel, Top Alcohol, ProMod, and several Nostalgia racing categories are examples in drag racing. MFI provides the ability to modulate […]
As introduced in our previous newsletters, checklists were assembled as good reminders for the numerous tasks & hardware that we would need for racing. Note that going through checklist items and organizing the records can be done by an enthusiastic pit crew member, such as a spouse, relative, or friend who is intimate with the […]