Another add i read on the crossflow head said that you could do 11:1 with
93 octane,and they actually tested this.For a daily driven car I wouldn't
go any higher than 9.5:1 myself.
Chris Eaton
'70 MGB Roadster
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> From: Scott Gardner <gardner@lwcomm.com>
> To: mgs@autox.team.net
> Subject: Octane requirements
> Date: Wednesday, May 14, 1997 6:44 PM
>
> Since we're on the subject, what is the highest compression ratio I
> could run on a freshly-rebuilt engine using 93 octane pump gas? My
> car never pings now, even when I do stupid things with the timing,
> and I usually alternate between 89 and 93 at the local Chevron.
> Moss's ad for the crossflow heads say that with flat-top
> pistons, you'll get 11:1 CR, but I don't know what kind of gas you'd
> need. I'm not interested in the Xflow head, because it seems like
> too much buck for not enough bang, after buying the head, manifold,
> and heater valve, not to mention the fact that I wouldn't want to
> cripple that head with my Weber 32/36 downdraft, but when an engine
> rebuild becomes necessary, I wouldn't mind going with one of the 2.0
> litre kits.
> I have a steady supply of 100 octane lo-lead at the
> squadron's fueling station, but would rather stick to 93 so I could
> actually go more than 125 miles from home without retarding the
> timing.
>
> Scott Gardner
> gardner@lwcomm.com
> www.lwcomm.com/~gardner
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