Matt,
have you considered using an Air/Fuel ratio gauge? It connects to a
generic O2 sensor that you add to your exhaust system. The gauge is $30
from Summit Racing and will show you rich/lean conditions directly.
Ulix
On Tue, 4 May 1999, Matthew P Johnson wrote:
> Has anyone ever tried selecting a needle for an SU carb after modifying
> the engine?
>
> The way I would like to do this is by using an Exhaust Gas Temperature
> sensor and gauge to determine the optimum fuel mixture. What is the
> optimum temperature for max. power?
>
> Is there rule of thumb based on EGT for determining how much the needle
> diameter needs to change to get the right mixture (e.g.; for every 100
> degrees from optimum temp change the needle diameter by .001"?)?
>
> Help would be appreciated.
> Thanks,
> Matt
>
Ulix __/__,__ ___/__|__
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'67 Sprite '74 X1/9
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