Automotive Analyses Homepage
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I have added a section where I will put files that can be downloaded for your use. I have two or three of them right now, but maybe the list will grow.. Jump to the files page

"Cylinder Pressure During Cranking"In one of the earlier technical essays, I determined what an effecive compression ratio was. In this essay, I'll tell you what the chamber pressures are if you include the thermodynamics.

"Water Injection Combustion Chemistry"I ran across a good description of water injection effects in and on the combustion process. I asked the author if I could use it and he said YES. Many thanks to Robert Harris! Good read, and short by comparison to my articles (he's smarter than me and can say it in far fewer words!). Good read.

"Charge Air Cooling Thought and Analyses" One of the list members asked me about he amount of ice needed to cool the charge air for a high horsepower motor. I figured that if one asked then others might want to know also. So I prepared this analysis for 4 different methods: water injection, alcohol injection, ait to air intercooler, and ice water to air intercooler. There is a companion spreatsheet available through the link above.

"Turbo/Centrifugal Supercharger Compressor Sizing" This little article is how I made the selection to use twin turbos for my Bonneville Sunbeam Alpine time trials car; how I calculate the turbo operating points and determine the basic parameters for my intercooler.

"Cobra HP vs Speed" Wanna know how fast your FF Cobra replica or real thing will go if you have a certain amount of horsepower? Well here is everything you want to know. Rest easy when you get to the page and scroll down to the table and chart!

"Parachute Yank Loads" Stopping a streamliner at speed is serious business. Deployment of a chute generates very high yank loads which can fail hardware very quickly! Please look this over and if nothing else, do you own analyses and be safe!

"Yet Another Scoop Sizing Method" One of the racers' on the Land Speed email list, Rich Fox, told me his way to to determine how big a scoop opening should be. He got his method from Bones and/or Charlie Markley. Works great! Thanks Rich!

"Column of Air" Scoop Sizing Hypothesis One of the racers' on the Land Speed email list asked me about a way to determine how big a scoop opening should be. There is a method in use by many racers that say that you assume that the scoop will injest a column of air of a certain size that just matches the engines' need at full speed and rpm...there is a danger is doing this, however.

Horsepower Determination after a Cd change One of my best friends is contemplating a LSR class chage. He had a good terminal speed number and knew the sea level horsepower he mad for that run. He wanted to know if it could be determined how much horsepower would be needed if he changed class and added some drag components back onto his car. This was fun for me.

Determination of Drag Coefficient: A number of people have asked "How do we determine the drag coefficient for our vehicle?" I hope this helps. The derivation is long because I wanted all the steps to be shown, but at the end is the formula and method. Enjoy!!

Effective Compression Ratio for Boosted Engines: I watched the LSR list for a while and there was some question of "What the heck is my compression ratio if I have a supercharger?" I lifted the basic equation from somebody, but did in fact derive it myself. It is not overly complex to use. Some have said it is not dorrect, and it probably isn't right on the money, but I will fix that with an otto cycle analysis one day. My Desktop Dyno 2000 software does it and gets a BMEP.

Drag Coefficient, Frontal Area and Horsepower:Wow, this was a lot of work, but it is done now! This section contains two sets of drag coefficients for a lot of cars, trucks and even the Hummer! These values are converted to a factor that is used in a set of curves to determine the horsepower needed to drive the vehicle at speeds from 100 to 450 mph.

Horsepower vs Speed: This analysis was performed to answer a basic question of how much horsepower does it take to go fast? It is equally applicable to the Tiger or the Alpine models as the drag coefficient is the same and the weight differences are minor.

Rod vs Stroke Ratio: This analysis was performed in an effort to determine the basic effects of the length of an engine's rods on torque. Theory says that longer rods are supposed to extend the power range through improved breathing and allow the piston to dwell at TDC for a longer period of time. Thanks to Bill Kohn, an astute reader, I have made corrections to some of the data contained herein. Thanks, Bill!

Perfect Steering for the Tiger: This analysis was performed to to determine whether or not the Tiger's steering could be improved using alternate or modified parts.

Copyright (C) 1998 - 2004, all dates inclusive, L.E. Mayfield - All Rights Reserved
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