Roger, Actually it goes back even further than that. The roots of that engine
were in the Standard Eight which had an 803 cc version.
The bore was 58 mm with a stroke of 76 mm
The 948 was a bored out version of the 803 (63 x 76 mm)
Then came the 1147 (69.3 x 76 mm)
1296 (73.7 x 76)
After that, it was determined that they could not safely increase the bore so
to increase the displacement, they could only tackle the
stroke. So the 1500 (actually 1496) has a bore of 73.7 mm and a stroke of 87.5
mm.
Joe
Roger Elliott wrote:
>
> As I understand it the Spitfire engine was based on the 948 Herald engine
> and was increased to 1500 (boy were those original engines over
> engineered). The Midget ended up using the Spitfire engine mainly because
> the MG engine was close to the limits of increased size.
>
> So while 1275 to 1380 and 1500 to 1600 may be the about same percentage
> increase, you are really looking at both being increased from 948.
>
> Roger Elliott
>
> On Thu, 11 May 2000, Bill Miller wrote:
>
> >
> > Joe,
> >
> > Sorry to take so long replying to you, I wasn't ignoring you, I was out of
> > town for work.
> >
> > I tried a quick search, all I came up with was info on a BMC A series
> > engine. Same principle though. This guy took a 1275cc (originally the A
> > series were 948cc) all the way up to 1380cc in his bugeye. 1275 -> 1380 is
> > 8.5%; 1500 -> 1600 is 6.5% so we are basically talking the same thing
> > here, if not a little more. His website is:
> >>
> > Take Care,
> > Bill
> >
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