[Land-speed] Car Spins

[NT788 at comcast.net]

Negative scrub would make steering easier,I E kingpin intersection outside of
contact patch, with positive caster. Some heavy cars did have neg caster,
maybe in conjunction with pos scrub.I think my 69 Chrysler station wagon might
have been a B scrubber it wore out tires before it got out of the garage.

B Jack


----- Original Message -----
From: "John Burk" <joyseydevil at comcast.net>
To: "LandSpeed List" <Land-speed at autox.team.net>
Sent: Sunday, June 14, 2009 11:17:00 PM GMT -08:00 US/Canada Pacific
Subject: Re: [Land-speed] Car Spins

Skip

My understanding is before power steering was standard suspension engineers
used a few inches of positive scrub to reduce steering effort for parking
and now they let other things dictate scrub . The big 3 no doubt have tons
of data on front end design testing like trading caster for trail . There is
something called induced trail which I think is the rearward shift of the
contact patch on low pressure tires . What's good for them isn't
necessisarily good for us . I was up fighting NYC traffic picking up a
Segway I bought on Ebay to make getting around at Speedweek easier . Going
to add a seat of some kind .



> At 02:37 PM 6/12/2009, John Burk wrote:
>>Caster doesn't change rear tire loading if scrub is zero .
>
>
>
>
> John,
>
> What is a typical factory scrub dimension for a 2WD steering system? And a
> car racing at lakes and Bonneville? Different for long and short WB? Where
> can the data be found?
>
> Skip
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