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Ron - your 1 lb per HP hr rule of thumb is a good one for naturally aspirated methanol engines. But as Mike correctly points out . . . more...
Thanks Chuck, Mike and Charles for the comments! "Motorsports Standard Atmosphere and Weather Correction Methods" is a 104 page book about...
Two years ago today. . . still remembering and thinking about you Mark Niver! And your passion for family and drag racing. Patrick Hale
I’ve had several requests for copies of Chapter 15 from people who have not yet purchased the MSA Weather Book . . . but are considering buying it...
I have added a new Chapter 15 to my MSA Weather Corrections Book (www.DragRacingPro.com/Books.html) to specifically cover supercharged engines –...
Swamp Coolers Mike, aj481x - let me repeat something I posted a few months ago on this topic: Many people have an evaporative cooler in their...
Darvin - take a look at the left side of this image for all the common blower sizes. The values are stated in cubic inches per revolution of the...
All fluid flow calculators and programs use the same basic flow equation developed centuries ago using Bernoulli’s Principle: GPM = Some...
It's hard to give a simple answer to these questions. Like everthing else in racing it kind of depends . . . The current NHRA limit for...
Chilling the Methanol My travels this year working with top-tier NHRA Top Alcohol teams showed how critical fuel temperature was for proper...
John - Nitromethane is a mono-propellant (i.e. rocket fuel). It doesn't really need any air/oxygen to burn. It doesn't matter what percentage you...
Nitromethane properties The "critical temperature" for nitromethane is 599 degF and the "auto-ignition temperature" is 785 degF. The "critical...
A standard rotor is twisted at 4 degrees per inch of length. A high helix rotor is twisted at 6.5 degrees per inch of length. However, if you look...
Absolutely! You can put in your current safe alcohol tuneup, change the fuel to 90% Nitro and watch the engine explode on the computer. ;)...
The Whipple A980 displacement is 601 cubic inches per blower revolution (9.80 liters/rev) where the PSI 210-C displacement is 476 cubic inches per...
PSI blower dyno The video below is the very first time Norm Drazy and I spun up a PSI screw blower on the blower dyno (August 1987). As you can...
I reduced all the data from the original PSI blower dyno testing in 1987. This was for the lower flow 200-A rotors. I just pulled out all the old...
The PSI 206-B supercharger is intended for gasoline fueled applications, primarily marine. So it is designed to operate in a much hotter...
PSI and Whipple CID/Rev The pumping displacement (in cubic inches per revolution) for the Screw blowers is about: PSI 200-A = 385 cid/rev (200...
Mike - the math (based on the physics of drag racing) needed to answer your question goes like this. ET changes like the "cube root" of the WT...
