[Mgs] Petrol

[i erbs]

Interesting view.
Thanks

Ira Erbs
Milwaukie, OR
1959 Austin Healey 100-6
1967 MGB Roadster

On Fri, Sep 22, 2023, 3:02 AM <h.duinhoven at planet.nl> wrote:

> It is not for the octane grade only, that premium fuel is the best choice.
> It is best to avoid ethanol additions as much as possible.
> In the Netherlands we still can choose between 5% or 10% ethanol.
> Premium fuel 5% is the best and offers the least chance of damaging the
> old type of fuel lines - hoses and gaskets in the carburettors.
> It also offers 98% octane, which had the least chance of pings.
> The final advantage of 5% ethanol is, that this fuel has a higher energy
> content, which gives a better mpg figure.
> So it is worth while to make the best choice.
> I even use 5% ethanol premium fuel in my daily driver Mazda 6, which gives
> a nice fuel economy and a clean fuel system.
>
> Cheers, Hans
> No BGT anymore - just enjoying MG news
>
>
> -----Oorspronkelijk bericht-----
> Van: Mgs <mgs-bounces at autox.team.net> Namens Paul Hunt
> Verzonden: donderdag 21 september 2023 09:47
> Aan: mgs at autox.team.net
> Onderwerp: Re: [Mgs] Petrol
>
> As already said if you have a low compression engine then lower octane
> should be fine.  If high compression then you will get the benefit of
> better performance and economy with higher octane.  Low ethanol is better
> in both cases.
>
> Because the fuel today is so different to when these cars were first
> produced the original timing specs are no longer relevant. If you get
> pinking then back off the timing until you don't at any combination of
> throttle opening, revs and load.  With high compression and high octane try
> advancing bit by bit until you get pinking, then back off a bit till you
> don't.
>
> You are less likely to get pinking on low compression even with low octane
> fuel, so if you can run the book figures for timing without pinking then do
> so.  You might get a bit better by advancing, but you can advance so far
> that it stalls the starter but still doesn't pink. That's obviously too far.
>
> PaulH.
>
> On 20/09/2023 16:32, i erbs wrote:
> > I just got my B running for the first time and have a newbie question.
> > I have looked online and got confusing answers.
> > What grade petrol do I use? Must I use premium grade? Can I use regular?
> > Thanks.
> >
> > Ira Erbs
> > Milwaukie, OR
> > 1959 Austin Healey 100-6
> > 1967 MGB Roadster
> >
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