Fuel Injection High Speed Bypass for NA Engines
The high speed bypass is often used in a fuel injection setup.
NORMALLY ASPIRATED ENGINES
The high speed leans out the engine as the RPM go up and the volumetric efficiency goes down.
The VE is often near 100% at the torque peak.
The air flow per revolution is max.
A typical norm asp engine cammed up for racing may see a torque peak around 5,000 RPM.
Tuning should be with the main bypass for max power up to the torque peak or just beyond.
We often recommend an AFR of 4.8 to 1 for methanol fuel for the torque peak.
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Fuel In. Jetting Calc. for Top Fuel, BDK Bypass Valve setups
Our fuel injection calculator can provide a valuable
air to fuel ratio (AFR) computation for professional top fuel and normally aspirated A-fuel racing for land or water sports.
- For example, a typical blown high percentage nitro V-8 setup will have an AFR less than 1 to 1 at the start and lean out to over 1.5 to 1 at the finish of a 1,000 foot drag race. Incremental tuneup changes to the fuel curve can be determined ahead of time with precise numerical references.
- In a second example, a typical 90% injected nitro V-8 setup will have an AFR less than 0.3 to 1 at the start. Leanout to keep the 'candle lit' can be numerically determined ahead of time; then set into the fuel bypass controller for numerical control.
Our fuel injection calculator also provides a valuable
oxygen to fuel ratio (OFR). Oxygen to fuel ratios (OFR's) from the calculator are a "next level of advance tuning".
- The oxygen part of the combustion process is determined from all sources: nitro, methanol, blower, & air density.
- The total amount of the other parts that contribute to combustion are determined from the fuel. That is specifically carbon, hydrogen, & nitrogen that combust.
Nitrogen in the air, excluded from combustion, is also excluded from the OFR calculation, making the OFR tuning value way more affective.
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