re: CAMS

[Dana Loomis <dloomis@xxxxxxxxxxxxxx>]

Chip Schug wrote:
>I am still trying to find the "right" cams or the right setup for that
>matter in my '79 2L Spider which I have rebuilt (over 2 years ago) with
>10.4 Borgo pistons, new racing valve springs, oversized valves in IN &
>EX, changed from SPICA to 40 DCOE Webers and all the other goodies used
>on a rebuild.  I went from the stock cam to the Columbo 11mm cam and am
>using the Marelli Plex ignition system.
>
>My Spider has a lot of "power", but I can not get the car over 100 mph
>without going over 5500 rpm in 5th gear.  

Something doesn't add up; the top speed should be higher, even with a stock
engine.  First of all, are you sure the speedo and tach are correct?   As
for the engine work, the modifications involveing the pistons, valves and
cams sound pretty standard, but the carbs may not be right.   You should
have increased the engine's breathing capacity with big valves and
increased lift, but if you haven't done anything upstream of the valves,
you may not be able to take advantage of that potential.  40 mm carbs were
the stock setup, so a larger carb might be needed.  It's also a good idea
to making sure the intake ports line up.

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End of alfa-digest V7 #245
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