Author Topic: 1974 Mini Marcos - tidying up  (Read 2222 times)

Offline MPlayle

Re: 1974 Mini Marcos - tidying up
« Reply #75 on: October 09, 2019, 05:57:56 PM »
I got out to the garage and did the alignment today.

I measured the existing settings prior to making any changes.  This is what a local service shop left it at from the second try at an alignment on a Hunter machine.

                   Left        Right
Caster         +7.25*     +9.5*    (degrees)
Camber       -0.75*      -2.0*     (degrees)
Toe (in/out)   0.0"       1-1/8" toe-in (inches)

I used a string "box" to get some "center line" references for each side, my bubble style caster/camber gauge, some home-made slide plates (two vinyl tiles, smooth sides together with grease between them) and a set of 24" toe plates.  I was able to get the desired settings Dave recommends: +3.0* caster, -0.5* camber (both sides) and 1/8" total toe-out.

I will take it out on the highway tomorrow to see how it feels. 

Offline MiniDave

Re: 1974 Mini Marcos - tidying up
« Reply #76 on: October 09, 2019, 06:31:35 PM »
It should be immensely better, and easier to steer! That much caster is nuts!
1989 Cooper Racing Green
2009 Clubman S
2004 Audi Allroad 2.7 TT

Offline MPlayle

Re: 1974 Mini Marcos - tidying up
« Reply #77 on: October 09, 2019, 06:50:42 PM »
They had something registered wrong on their machine as I recall it was trying to tell them to shorten the control rods to go to a smaller angle.  When I read up on alignments, that was the wrong direction to be going.  Following the instructions for my bubble gauge, lengthening the control rod would push the wheel back and make a smaller caster angle.

The lesson I learned is their "techs" may be good at following the directions of the machine, but they do not know the geometry and function of the settings.  If the machine is not registering correctly, they still blindly follow its directions even though backwards.  They do not know the geometry and so cannot tell when the machine is not operating correctly.


Offline MiniDave

Re: 1974 Mini Marcos - tidying up
« Reply #78 on: October 09, 2019, 08:41:58 PM »
I ran into this a lot when I taught steering and suspension at college, my solution was always to tell the kid to pull the car off the rack and roll it back on and start over. Sometimes the machines lose their way too - and you have to reset it to get it accurate.

A tool is only as good as the guy using it...

Waiting to hear how it drives now.... 77.gif

Oh, and yes, you lengthen those rods to reduce the caster angle.
1989 Cooper Racing Green
2009 Clubman S
2004 Audi Allroad 2.7 TT

Offline MPlayle

Re: 1974 Mini Marcos - tidying up
« Reply #79 on: October 10, 2019, 03:02:35 PM »
Had the Mini Marcos out for a "test drive".  It handles much better - more stable in curves at speed on the highway.  It is still a light handling little car, but no longer feels like it is suddenly trying to plunge into hard turn halfway through a bend in the highway.

I'm gradually getting confidence in it for general running around.  Now if only the 95*+ temperatures would finally break.


Offline gr8kornholio

Re: 1974 Mini Marcos - tidying up
« Reply #80 on: October 10, 2019, 03:40:35 PM »
You guys not getting any of this cold front coming in overnight?  Tomorrow high is 60 and think Sat. low is 40's
I am the GR8KORNHOLIO! Are you threatening me?

Saussie Aussie 1965 Australian MK1 Mini.
"Beavis" - 07 MY/MY MCS, B/MY Konig Daylites, JCW sideskirts, TSW springs, TSW lower rear control arms -- Exploring the country with new friends since 11/09.

Offline MPlayle

Re: 1974 Mini Marcos - tidying up
« Reply #81 on: October 10, 2019, 10:39:42 PM »
We're supposed to get some of the front tomorrow (Friday) morning.  Good for a couple days cool down into the 70's daytime and upper 50's overnight.  Back into the upper 80's to mid 90's by Monday/Tuesday.