Bob, You are right, the number of cylinders has nothing to do with
octane requirements; but, I can't see any reason why a car running 8.8:1
compression ratio can't use regular gasoline. The bottom line is if it
pings or pinks when you are driving either tune it, or increase the
grade of your gasoline. There is no advantage of running premium gas if
it is not needed.
Larry Hoy
> -----Original Message-----
> From: owner-mgs@autox.team.net
> [mailto:owner-mgs@autox.team.net] On Behalf Of Bob D.
> Sent: Sunday, April 28, 2002 10:00 PM
> To: mgs@autox.team.net
> Cc: mg-t@autox.team.net
> Subject: Re: Gasoline / Octane
>
>
> A think some MGB owners are incorrectly assuming that they
> can use regular just because the engines are four cylinder.
> The shop manual specifies 98 RON octane for the HC (8.8:1)
> engines and 93 RON octane for the LC (8.0:1) engines. In US
> (RON+MON)/2 terms, that's 92 octane for the HC and 87 octane
> for the LC.
>
> I use premium in all my cars, even my TD. Even though the TD
> doesn't need it, I figure the extra octane is a hedge against
> pre-ignition in the event the engine overheats or the timing
> gets out of whack. Does this make sense, or am I being stupid?
>
> Bob Donahue (Still stuck in the '50s)
> Email - bobmgtd@insightbb.com
> 52 MGTD - NEMGTR #11470
> 71 MGB - NAMGBR #7-3336
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