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Alignment specs 71 Mach 1
#1
runninpony 
Looking for some info on Alignment specs for a 71 March 1. From what I heard about poly bias tires that were original specs in 71 to today's radials. Are there differences between the 2 different tires vs alignment specs?
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#2
THe the alignment on my 72 Mach 1 is set to stock toe in but -05* camber and +2* Castor with 235/60/15 BF Goodrich tires. I have run this set up for several years. It provides good steering wheel return and good highway stability. The factory specs makes the car feel like poop in my opinion.
Ron
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#3
Someone correct if I'm wrong (I'm used to it, I'm married) but I think the stock figures are for bias ply tires and will not apply for radials.
Problem is, I have no idea which specs would apply to radials then.

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Mike

"If I were you...... I´d rather be me."  Tongue

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#4
the biggest change from ply to radial

ply, added caster because of the way the wheel would deform.
radial does not it is much stiffer.

ply has bands going across the tire and that caused the tire to add additional toe-in again from deformation.
radial the bands go around and it does not deform and add Toe-in.

so for a ply tire they would cut back on toe in and caster to compensate.

general rule, 1/16-1/8 Toe in on a radial and Caster your suppose to put as much positive caster as a car can tolerate, there is a limit because the suspension will start binding and you start hitting the strut rods on the front sway bar, there is also all kinds of defects in our cars from original assembly at the ford. So there is a range of like 1.5 to about 3 degrees of caster that you can play with 1.5-2 is usually good. as you get a good auto centering from the steering wheel at speed. 1/8 toe in is usually good for most radials.
the camber depends on you in a track car you want more neg camber. street recommended is between 0 and -.5 camber add more and you get more aggressive steering and tire wear and more bump steer as well.

1/8 toe in
1.5-2 caster
and 0 to -.5 camber is usually a good range.


I'll fix the misspell in the title too.
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#5
Do these specs also apply for an aggressive summer tire? Running 255/45/17 and 225/50/17 BFG sport comp2. Power steering and lowered 1.5" TIA

1971 Mustang Grandé, 351 Cleveland 2v, C6, 9"
-Fitech EFI
-Comp Cams 284hr
-Aussie Heads
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My Build
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#6
Agree with above.

Our cars LIKE Caster 2-2.5 Degrees.

Too little the car is unstable.
Too much and you get road shock.

MAIN THING IS: Caster and Camber BE EQUAL both sides!

Paul
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