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#Post#: 2612--------------------------------------------------
Fuel for NF
By: Dunders Date: April 29, 2019, 11:37 am
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Hi all,
I didn't want to hijack Kris's thread, but I saw this from
Randall:
[Quote] 5-Use gasoline 98 of high premium gasoline ( do not use
biofuel) [/Quote]
and it jogged a memory from the recent VMCC test day at Jurby,
so I thought I'd start a new thread.
The local Guzzi single guru came to discuss my NF (he has 6 pre-
and early post-war Guzzis, so mine was a 'new' machine!). I
told him about the hesitation I was getting at full throttle,
and he advised using premium unleaded with some
octane-increasing additive for the singles. His rationale was
that back in the day Agip supplied the forces/carabinieri with
some of the best fuel available in Europe, so that's what they
should run on. It seemed counter-intuitive to me, as the NF is
such a low compression engine, and i've heard the 'jokes' about
running on paraffin....
I respect Alec's opinions on matters Guzzi, so I stored the
conversation away for when I got back from the Stafford Show
(which I've just done...) and my ageing synapses forgot it till
I read the above quote.
Is there any collective wisdom on this? Anyone wish to opine?
Thanks!
Paul
#Post#: 2613--------------------------------------------------
Re: Fuel for NF
By: banquo Date: April 29, 2019, 1:07 pm
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Almost as good as an oil thread this! ;D
All I can say is that I've run mine on Supermarket unleaded
since 2002, with no obvious ill-effects, other than carb furring
up over winter, and it did that pre-ethanol too. Ethanol
definitely goes for the tap rubbers, but my view is that it
would run on kerosene or TVO once warm, although overheating
might be a problem. Using ethanol-free fuel would resolve the
rubber issue, and possibly improve the carburettor furring
issue, but as ethanol increases octane rating I see no advantage
in using premium fuel for that reason alone.
Just my opinion of course, but this from the AA pretty much
covers it:
Pros and cons of Ethanol
Ethanol is compatible with modern exhaust emissions control
systems and contains oxygen so enhances combustion and reduces
CO and HC emissions. It has a high octane number so helps
combustion.
But
Ethanol’s energy density is about 2/3 of conventional petrol so
fuel consumption will be a little higher and volatility is
increased which can contribute to higher evaporative emissions.
Critically Ethanol has higher solvency causing compatibility
problems with rubbers and can cause corrosion in aluminium, zinc
and galvanised materials, brass, copper and lead/tin coated
steels.
Ethanol picks up water and contributes to corrosion and phase
separation where Ethanol and any water held in solution can
separate out into distinct layers.
Ethanol can also cause starting problems at low temperatures.
#Post#: 2614--------------------------------------------------
Re: Fuel for NF
By: Dunders Date: April 29, 2019, 3:25 pm
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[quote author=banquo link=topic=402.msg2613#msg2613
date=1556561237]
Almost as good as an oil thread this! ;D
[/quote]
I aim to please! ;D
#Post#: 2621--------------------------------------------------
Re: Fuel for NF
By: cloggy Date: May 16, 2019, 9:39 am
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If you are just getting hesitation at full throttle either the
main jet is wrong or the timing is out/new condensor; The theory
about the engine needing high octane is B******s. Do a plug chop
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