[Healeys] tire pressure

[Michael Oritt]

While measuring tire wear may give historically accurate information we
really want to get it right before the tire wears unevenly.

Consider doing what is recommended at:

http://www.fluke.com/fluke/uses/comunidad/fluke-news-plus/articlecategories/automotive/racetracktemp

Admittedly much of what the site touts is not relevant to street driving
but you can get the information you need to adjust tire pressures in real
time.  And while a contact probe may be most accurate I use an infrared
pyrometer to tell me whether tire temps are increasing too much or not
enough, etc. etc.

Best--Michael Oritt

On Tue, Oct 25, 2016 at 5:57 AM, Oudesluys <coudesluijs at chello.nl> wrote:

> This works fairly well on cross-ply tires, but on normal radial tires it
> only works when pressures are really way out.
> It will however work for discovering front wheel misalignment for both
> types of tire.
> Kees Oudesluijs
>
> Op 25-10-2016 om 0:55 schreef Len and/or Marge Hartnett:
>
>>
>> Likewise, you can use a tire depth gauge.  This will take more time but
>> over time it can indicate problems other than tire pressure.  Measure the
>> depth at the inner edge of the tire, the center of the tire, and the outer
>> edge of the tire.  If checked every six or so months, even wear over the
>> width of the tread would indicate a pressure that is providing full tread
>> contact (9-9-9).  If wear is greater at the edges, tire pressure is too low
>> (7-9-7). If wear is greater in the center, pressure it too high (9-7-9).
>> If one edge is wearing more than the other, wheel alignment could be a
>> problem (7-9-9 or 9-9-7).
>>
>> If you need an excuse to  go out and drive the car hard periodically, the
>> chalk method will be your first and best choice.  The depth gauge method
>> will make you check your tire pressure and wear close-up more often so I
>> recommend you do that, also.
>>
>> While you are down there, check the date on the tires and the condition
>> of the sidewalls.  If you are getting depth readings at or below the threes
>> or they are over 7 - 10 years old, you are overdue for new ones.
>>
>> (The Other) Len
>> Fairfield, CA, USA
>> 1967 AH 3000 MkIII, HBJ8L39031
>>
>>
>> ----- Original Message ----- From: "Richard J. Hockert" <rjhco at att.net>
>> To: "Mike" <phoenix722 at comcast.net>
>> Cc: "Healey List" <healeys at autox.team.net>
>> Sent: Monday, October 24, 2016 6:04 AM
>> Subject: [Healeys] tire pressure
>>
>>
>> The correct tire pressure will vary widely from car to car, depending on
>>> tire type and static weight distribution.
>>>
>>> The correct method for determining proper tire pressure is as follows:
>>>
>>> 1. Use a soft white chalk to mark several vertical stripes across the
>>> tread and sidewall of each tire;
>>> 2. Drive the car hard, including tight turns;
>>> 3. Check the chalk marks. The marks should end at the knuckle where the
>>> tread and sidewall meet. Some tires have small triangles or arrows to mark
>>> the knuckle.
>>> 4. If the chalk remains on the tread, the pressure is too high. You are
>>> not using all of the tire.
>>> Chalk ends below knuckle, tire pressure is too low. The tire is rolling
>>> over too much.
>>>
>>> Best regards,
>>> Jim
>>>
>>>
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>>
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