Remember, that 98 octane figure is probably not using the R+M/2 method the
US uses -- it's probably using the international method, and translates to
about 90-92 US. I don't know what timing you're using, but my HC B needs
premium to avoid knock and dieseling at the factory timing spec.
on 4/21/03 1:43 PM, David Breneman at idcb@airborne.com wrote:
> Max Heim SEZ -
>> Why do you think you need a lead additive?
>>
>> Real world experience seems to indicate that under normal street conditions
>> these engines get by perfectly OK on unleaded fuel.
>
> Not only unleaded, but the mechanic who rebuilt the 5-main high-compression
> MGB engine for my MGA told me that I can use regular-grade unleaded in
> all but the warmest weather! This surprised me because my '68 MGB had
> basically the same engine, but the owner's manual said to never use
> less than 98 octane except in an emergency. I've always been sceptical
> of unleaded gas in pre-1975 engines - after all, if the government bans
> something it *must* be good! :-) But I'll trust an expert. This
> guy's rebuilt a lot of MG engines.
>
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
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