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Recently we’ve gotten some positive feedback we wanted to share:

“Thank You for the prompt reply and formulas you provided, now onward…….. Just want to tell you how much your books helped me in the tuning area. The reading was technical but interesting and informative. I found myself reading each chapter twice before moving on to the next as it flows chapter to chapter. Now I understand why and how the different aspects fit together and can make better calls and decisions. The 5000 Horse Power On Methonol book goes with me to the track so if need to, I can use the
formula’s and figure it out long hand on paper. Looking forward to positive results.”

Rickey Smith


“Do any of your books touch on the use of the Pete Jackson blown alcohol barrel valves? … Bob got your books they are outstanding!!”

Keith Grieves


‘bracket drag racing using ProCalc to maintain AFR with jetting adjustment for air changes … unheard of 0.0005 second ET repeatability during bracket racing competition from early morning all day to late night’

Denis Page, Clinton, Ma, USA

Fuel Injection Nozzle Fuel Velocity

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 some applications, nozzle location dramatically affects horsepower. Slower fuel velocity may reduce inlet air flow. More information is in our new book about high horsepower tuning of normally aspirated racing engines.