Mark ortiz är en chassi-konsult som bl a skriver i Race Car Engineering.
Han skriver också sedan 2000 ett månadsbrev där han besvarar frågor, och han har genom åren rett ut det mesta vad gäller chassidynamik
Jag har gjort en sammanställning av hans mest informativa artiklar inom olika områden
Längst ner finns också en lista på alla hans artiklar i kronologisk ordning, samt länk till en zip-fil med alla artiklarna.
En del frågor berör oval-racing så läs artiklarna under "oval track concepts" först där han reder ut begrepp och termer
zip med alla artiklar
Utvalda artiklar inom olika områden
oval track concepts
June 2002
Some basic oval track concepts for road racers.
May 2001
Rear Stagger versus static cross.
Chassis troubleshooting guide
July 2001
Chassis troubleshooting guide.
July 2003b
Chassis troubleshooting guide.
August 2001
Things that make spring changes work backwards.
october 2001
Balancing the car with camber and tire pressure.
June 2001
Weight transfer in winged over sprint cars
November 2001
Selecting springs.
February 2002
Things that make spring changes work backwards, revisited.
April, May, June 2003
Shock and spring forces.
August 2003
Load transfer basics.
September, october, November 2004
Tire load sensitivity and weight transfer in trail braking
September, october 2005
Load transfer question.
April 2006
Springs, bars and load transfer.
June 2006
Effects of spring rates and damper settings during cornering.
August 2007
Is it bad to lift a wheel?
Front/Rear weight distribution
March 2002
Racing front-drive cars.
october 2002
Move the rear wheels back to improve traction?
February 2003
More on rear wheel placement and traction.
November 2003
Weight distribution and tire size.
December 2003
More on racing front-drive cars and load transfer.
April 2004
More on weight distribution.
November, December 2005
optimizing engine-over-drive-wheels layout.
Corner weight
January, February 2004
Managing the behavior of the unbalanced.
Roll center and roll axis
May/June 2009
The anti controversy
June 2004
More on F1 control arm angles.
August 2004
Roll center migration, some more.
December 2004
Roll center below ground.
February 2006
Roll axis inclination.
September 2006
Roll center in trailing arm front suspension.
More on roll axis and related analytical concepts.
May 2007
Roll axis for live-rear-axle road/hillclimb car
Roll axis of the axle
December 2004
Roll moments from longitudinal anti.
Roll Center Myths and Reality
Roll Center Myths and Reality (artikel av Wm. C. Mitchell)
Polar moment of inertia
July 2000
Polar moment of inertia.
September, october, November 2004
Rear percentage versus yaw inertia.
May 2006
Rear percentage or polar moment?
Steering geometry
August 2002
Steering geometry variables.
Importance of steering rack placement.
November 2002
Trail and steering feel.
January, February 2005
Ideal spindle or steering geometry.
Ackermann
December 2002
Ackermann Recommendation.
January, February 2004
Reverse ackermann or toe-in on ovals.
December 2007
Ins and outs of toe and ackerman
Shocks
August 2000
The shock dyno lies!
December 2001
Analyzing shock traces.
January 2002
Suspension Natural Frequencies.
February 2002
Some Basic shock questions.
May 2002
Natural Frequencies revisited.
February 2003
Shock research update.
September, october 2003
Shock research update.
November 2006
Stiff rebound damping.
January 2009
Damping ratio
Tires
September, october, November 2004
Why are wide tires better?
January 2007
Tall vs. short sidewalls
June 2007
Large vs. small tire and wheel diameter
Beam axle
March 2003
Independent rear suspension for dirt?
January, February 2004
Independent or beam front axle suspension for paved oval?
July 2006
Beam axle pros and cons.
october 2006
Twist beams and jointed de dion tubes.
June 2007
Another triangulated four-link axle
May 2004
Arm angles in triangulated four-bar beam rear axle.
Panhard bars
December 2000
Shorty panhard bars versus long ones.
January 2003
Roll center with a j-bar/panhard bar
August 2006
Panhard bar longitudinal location.
Panhard bar jacking forces.
July 2007
High or low panhard bar
Frame stiffness and steel quality
February 2001
Required frame stiffness.
May 2001
Chromemoly in stock cars.
Differentials
December 2002
Torque, RPM and power distribution in differentials.
December 2003
Single or dual brakes for FSAE
March 2004
Differentiating differentials.
March 2006
Diff differences
Zero droop
February 2007
Zero-droop setups
July 2007
More thoughts on zero-droop setups, and related oval track spring split issues
Center of gravity calculation
September 2002
Front and rear center of gravity.
Winter reading
November 2000
Winter reading material.
Alla artiklar i kronologisk ordning
May 2000
Questions about a roundy-round camaro.
June 2000
Question about relative rear spring stiffness for roundy-round.
July 2000
Brake failure in late model pavement cars.
Polar moment of inertia.
August 2000
The shock dyno lies!
September 2000
Wheel Alignment and Caster
october 2000
Checking Rear Axles.
Torque arm or pull bar?
November 2000
Winter reading material.
December 2000
Springs, roll and cornering balance.
Shorty panhard bars versus long ones.
January 2001
Wind tunnel testing for short track cars.
Rear Caster.
Stacked coilover springs.
February 2001
Required frame stiffness.
Making ballast weights.
March 2001
Safety Issues - Hans device and soft walls.
April 2001
5th Coil location and rate.
May 2001
Chromemoly in stock cars.
Rear Stagger versus static cross.
June 2001
Weight transfer in winged over sprint cars.
July 2001
Chassis troubleshooting guide.
August 2001
Things that make spring changes work backwards.
September 2001
Stock car safety issues.
Tire Data.
october 2001
Balancing the car with camber and tire pressure.
November 2001
The big tracks and their big wrecks.
Selecting springs.
December 2001
Analyzing shock traces.
January 2002
Suspension Natural Frequencies.
February 2002
Winston Cup Harness Installation.
Things that make spring changes work backwards, revisited.
Some Basic shock questions.
March 2002
Racing front-drive cars.
April 2002
Quads on Pavement.
May 2002
Natural Frequencies revisited.
Spaceframe or monocoque?
Tire care.
June 2002
oily tires.
Some basic oval track concepts for road racers.
Narrower rear track than front.
July 2002
Braking/downshifting technique.
August 2002
Steering geometry variables.
Importance of steering rack placement.
Bumpsteer as ackermann modification.
The old torque/horsepower controversy.
September 2002
Pantera front end revisited.
Horsepower and torque revisited.
Front and rear center of gravity.
october 2002
Move the rear wheels back to improve traction?
November 2002
Another Tire care tip.
Pull rods, push rods or both?
Trail and steering feel.
Kart scaling.
December 2002
Ackermann Recommendation.
Torque, RPM and power distribution in differentials.
January 2003
Tire warmers.
Spring placement on triangulated 4-link.
Roll center with a j-bar.
February 2003
Shock research update.
More on rear wheel placement and traction.
March 2003
Independent rear suspension for dirt?
April, May, June 2003
Shock and spring forces.
July 2003
Right rear spring stiffest?
Influence of pushrod angle on wheel rate.
July 2003b
Chassis troubleshooting guide.
August 2003
Load transfer basics.
September, october 2003
Shock research update.
November 2003
Weight distribution and tire size.
Width versus drag.
December 2003
More on racing front-drive cars and load transfer.
Single or dual rear brakes for fsae?
January, February 2004
Reverse ackermann or toe-in on ovals.
Managing the behavior of the unbalanced.
Independent or beam front axle suspension for paved oval?
March 2004
Differentiating differentials.
April 2004
Effect of caliper mounting position.
More on weight distribution.
Spring splits with big bars.
May 2004
The new nascar tire.
Control arm angles in F1.
Arm angles in triangulated four-bar beam rear axle.
June 2004
More on F1 control arm angles.
Clutch use when downshifting.
July 2004
Setup for lower grip.
Lowering blocks on truck arms.
ohlins high-frequency pistons.
Which shock to soften?
August 2004
Roll center migration, some more.
September, october, November 2004
Tire load sensitivity and weight transfer in trail braking.
Why are wide tires better?
Rear percentage versus yaw inertia.
Roll springing preload in monoshock setups.
Why so few rear monoshock setups?
December 2004
Roll center below ground.
Roll moments from longitudinal anti.
January, February 2005
Ideal spindle or steering geometry.
March, April 2005
Finer points of anti-roll bars on stock cars.
May, June 2005
Too much left percentage?
July, August 2005
Dynamics of three-wheelers.
September, october 2005
Load transfer question.
November, December 2005
optimizing engine-over-drive-wheels layout.
January 2006
Tires in the snow.
February 2006
Roll axis inclination.
March 2006
Diff differences.
April 2006
Springs, bars and load transfer.
May 2006
Rear percentage or polar moment?
June 2006
Effects of spring rates and damper settings during cornering.
July 2006
Beam axle pros and cons.
August 2006
Panhard bar longitudinal location.
Panhard bar jacking forces.
September 2006
Roll center in trailing arm front suspension.
More on roll axis and related analytical concepts.
october 2006
Twist beams and jointed de dion tubes.
November 2006
Twist beams and jointed de dion tubes.
December 2006
Twist beams and jointed de dion tubes.
January 2007
Tall vs. short sidewalls
Braking distance, brake torque and tire traction
February 2007
Modern driveshaft joint vs. rubber doughnuts
Zero-droop setups
March 2007
Diamond layout
April 2007
Roll steer and anti-squat/ant-list in strut suspension
May 2007
Roll axis for live-rear-axle road/hillclimb car
Roll axis of the axle
June 2007
Another triangulated four-link axle
Large vs. small tire and wheel diameter
July 2007
More thoughts on zero-droop setups, and related oval track spring split issues
High or low panhard bar
August 2007
Is it bad to lift a wheel
Hollow vs. solid anti-roll bars
December 2007
Ins and outs of toe and ackerman
January/February 2008
More exotic vehicle layout ideas
March 2008
Another exotic car layout
April 2008
Late Corvair rear suspension
May 2008
Another pony car suspension from the '60's
Really quick steering
June 2008
Why not go for 100% camber recovery
Gyros for roll stability
July 2008
Front to rear track ratio
August 2008
Dirty tricks
Porsche 993 rear suspension
September 2008
Monoshock suspensions, z-bars, Stock car front ends with bump rubbers
october 2008
Differentials and yaw control
November 2008
Yaw moments from diffs with front-wheel drive
Turn-in on slippery surfaces
December 2008
Controlling AWD front/rear torque split on a budget
Is there such a thing as too big tires
January 2009
Damping ratio
February 2009
Camber recovery
March 2009
Trailing arms with torsional rubber springing
Ride and roll rates with monoshocks
April 2009
Raised lower control arms on 2009 F1 cars
Pullrod suspensions in F1
Rate and length numbers on torsion bars
May/June 2009
The anti controversy
zip med alla artiklar
PS. ...och ja, det är en helt laglig nedladdning :
"The Mark ortiz Automotive
CHASSIS NEWSLETTER
PRESENTED FREE OF CHARGE
AS A SERVICE To THE
MOTORSPORTS COMMUNITY
"
It's smiles per gallon isn't it? 
och det kommer komma en tråd med dessa inom kort.
