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Author Topic: Tyre Pressure for HPE  (Read 2637 times)
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Fulvia 3
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« on: November 20, 2015, 01:19:41 PM »


Happy owner of a 1978 HPE 1600 since last month.
According to my Instruction Book, inflation pressure should be 24 psi !!
[27 psi when full loaded and 28 full loaded and constant high speed.]
According to a 1976 North American specs Instruction Book, inflation pressure is 28 psi (sounds logical).
For the first month I tried 27 psi and she drives nice. I cannot persuade myself to try 24 ....
What is your experience on the subject?

Thank you,
M
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HFStuart
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« Reply #1 on: November 20, 2015, 02:01:28 PM »

Maybe 24 on the back when empty but seems too low.

What tyre size?

I run 185/65 14 with 29psi all round (in a spider) and it works well.
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smithymc
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« Reply #2 on: November 20, 2015, 02:24:02 PM »

My handbook says the same for the coupe - I now run 26 all round one or two up on standard tyres.

Mark
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Fulvia 3
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« Reply #3 on: November 20, 2015, 03:24:30 PM »

What tyre size?


175/70-14
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HFStuart
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« Reply #4 on: November 20, 2015, 08:17:35 PM »

Reckon 27 all round would be about right then.
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Neil-yaj396
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1979 1300 Coupe 1983 2000ie Coupe


« Reply #5 on: November 21, 2015, 09:05:50 AM »

The pressures in the handbooks always seem to be on the low side by up to date standards.
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lbcoupe76
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« Reply #6 on: November 21, 2015, 10:14:29 AM »

You have to take into consideration that every tyre manufacturer will have different sidewall construction and therefore different pressures. Tyres have changed a lot since those tyre placards where written. Look up the rule of four for tyre pressure, this works well. if you can't find it i will type it out for you.
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1976 Beta coupe 1800 "Kermette"
1975 Beta coupe 1800 x 2
1974 Beta Berlina 1800
1989 Thema i.e turbo
1988 Thema i.e turbo
Fiat 1500



Smoke me a Kipper i'll be back for breakfast
peteracs
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« Reply #7 on: November 21, 2015, 12:07:20 PM »

You have to take into consideration that every tyre manufacturer will have different sidewall construction and therefore different pressures. Tyres have changed a lot since those tyre placards where written. Look up the rule of four for tyre pressure, this works well. if you can't find it i will type it out for you.

Good call, I had forgotten about that. Here is what appears to be a good write up

http://cdn2.hubspot.net/hub/210453/file-20229690-pdf/docs/importance_of_optimum_tyre_pressure_and_temperature.pdf

Peter
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Beta Spyder S2 pre F/L 1600
Saab 9-3 1.9Tid Cabrio
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