The E-Type had 3 carb's, each feeding adjacent cylinders. I've never looked
to see the piston timing relationship on each set of cylinders.
I'm sure that the 3 carb setup gives more power than the 2 carb because of
a bit of Jag history. A few years after the XK120 came out, the factory
offered a version that had a higher output engine (carb changes, and cams I
would suppose). When the XK140 came out, this hotter engine was made the
standard engine. But the factory soon offered a hotter version of the XK140.
When the XK150 came out, the highest output XK140 engine was standard. Of
course they eventually hopped up the XK150 engine; this was made the standard
engine in the E-Type. There were 2 carb's on XK120's and I think most XK140's.
I don't remember whether the XK150 had 2 or 3 carb's, but the E-Type had
3. Anyway, the point is that they went from 2 to 3 carb's in one of their
quests for more power from the engine. If more power could be extracted
from 2, I'm sure they would have found a way to do it when they were using
2 on the XK's.
Joe
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