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Re: [Healeys] Tire Pressure

To: Guy R Day <grday@btinternet.com>
Subject: Re: [Healeys] Tire Pressure
From: Chris Dimmock <austin.healey@gmail.com>
Date: Thu, 17 Dec 2009 02:22:40 +1100
Hi Guy, if I was using 'fresh' 40 plus year old technology tyres on a  
Healey, those factory manual settings would have been appropriate.

Forget the manual, it's almost 2010. Your loaded run pressures are  
much closer on a spridget than the factory manual.

The "max inflation pressure" guideline on the sidewall is a good  
general target to aim for hot. Usually around 37 - 40 psi hot. Usually  
30 - 36 psi cold. As a rule of thumb. General guidance. No warranty  
implied or offered......

Ambient air temp affects this too. I'm basing my experience on living  
in Sydney, Australia, where we just don't experience the temperature  
variations in a year some of you guys do. But the again, if it's  
snowing, you probably aren't driving the Healey at 10 tenths anyway,  
are you? I'm talking summer/ nice Healey driving weather.

;-)

Chris

Sent from my iPhone

On 17/12/2009, at 12:44 AM, "Guy R Day" <grday@btinternet.com> wrote:

> As no-one has come up with definitive tyre pressures - the MG Midget  
> Mk III 1967 handbook says:-
> Wheel size:            disc   3.5Dx13;        wire       4Jxl3 5.20x13
> Tyre size and type  Dunlop C41 Gold Seal (Nylon) Tubeless 5.20x13
>
>                             SP 41 - Tubed Radial  (still a stiffish  
> one)
>
> Tyre pressures (set cold):
>
> Normal . . . . Heavy duty . . . .   SP41
>
> Front . . . . .     19 psi  . . . . . .    22 psi
>
> Rear  . . . . .     20 psi  . . . . . .    24psi
>
> For sustained speed in excess of 80-85mph
> Front . . . . .     22 psi  . . . . . .    22 psi
>
> Rear  . . . . .     24 psi  . . . . . .    24psi
>
> Haynes Workshop Manual states:
>
> Crossply . . . . . .    Front  . . . . . . .  Rear
>
> Normal driving  .    18psi                20psi
>
> Max load  . . . . .    18psi                24psi
>
> High Speed . . . .    22psi                28psi
>
> Radial . . . . . . . . .   Front  . . . . . . .  Rear
>
> Normal driving  .     22psi                24psi
>
> Max load  . . . . .     22psi                26psi
>
> High Speed . . . .     28psi                30psi
>
> Mine ran normally at 28front / 30rear, upping to 30f/30r for a  
> lightweight fast run and 32f/34r for a loaded run.
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