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TOPIC: Type of fuel

Type of fuel 1 year 7 months ago #40184

About to fill up my 1987 X19 with fuel.Can it safely run on unleaded or do I add an additive to protect the valve So?

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Type of fuel 1 year 7 months ago #40189

I have used 95 octane unleaded since the demise of 4 star with no problems.

Some people prefer 97 octane.

You dont need to use an additive.
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Type of fuel 1 year 7 months ago #40216

There is a Fiat document somewhere which iirc says that the X1/9 can run on unleaded but that additives may be needed to avoid damage under " prolonged high speed running"
I found that mine ran much better on Shell optimax (especially with the ethanol levels rising in std fuel) and used Shell Valvemaster additive whenever I was planning a long slog along fast roads.

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Type of fuel 1 year 7 months ago #40222

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Been reading some interesting article on the MG T series website and the issues modern fuel causes in old classics. While our cars may not be as badly affected as theirs it has proved to be an interesting read, I’ll see if I can get the links up.

I use 97 Ron where I can and think I’ll experiment with a little 3~5deg more advance as it seems this can help in keeping exhaust temps down and preventing a weakened mixture.

One very interesting find with ethanol fuels is they are much more volatile than none ethanol fuels meaning they vaporise at much lower temps causing bad running and hot start issues. Glad our cars have a carb coolling fan!

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Type of fuel 1 year 7 months ago #40224

Treat it to some 99 Ron Shell Optimax if you want the best performance
1986 'BAD' Turbo Bertone X1/9
1977 1300 Special Series
1989 Lotus Esprit 2.2 Turbo
1999 Toyota MR2 3.0 V6 vvti daily driver

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Type of fuel 1 year 7 months ago #40225

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Acknowledgement to Paul Ireland of the MG T-Type club ( ttypes.org/ttt2/ ) for these excellent articles on classic engines and modern fuels.

Whilst the test subject revolves around the XPAG engine and modern fuel, some very interesting facts emerge from these articles that readers may find useful. I certainly want aware of the move to Ethanol 10% based fuel or the variability summer/winter in supply of petrol throughout the year. Hope you find the articles as interesting as I did.

ttypes.org/ttt2/modern-petrol-and-classi...anchester-xpag-tests

ttypes.org/ttt2/manchester-xpag-tests-modern-petrol-volatility

ttypes.org/ttt2/suck-squeeze-bang-and-bl...anchester-xpag-tests

ttypes.org/ttt2/manchester-xpag-tests-th...ems-with-modern-fuel

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Type of fuel 1 year 6 months ago #40234

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For those interested Esso 97 octane fuel contains no ethanol depending on which region you are in,,from their FAQ:

“Esso super unleaded petrol (Synergy Supreme+ Unleaded 97) is ethanol free (except in Devon, Cornwall, the Teesside area and Scotland). We would therefore advise anyone who has concerns about the presence of ethanol in petrol to use Synergy Supreme+ – providing they do not fill up in Devon or Cornwall, the Teesside area or Scotland.”
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Type of fuel 1 year 6 months ago #40250

In my archive I’ve a letter the original owner wrote to fiat asking about this. The reply wasn’t convincing and so it was only run on leaded 4* until I had it 12 years ago. Since then it’s only been run on shell v power. And it runs very well averaging over 40mpg.
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Type of fuel 1 year 5 months ago #40275

The Federation of British Historic Vehicle Clubs has a list of fuel additives which they've tested.
They also have a list of the very few places where you can still purchase 4 Star leaded petrol.
Fuels, additives & 4 Star

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