On Monday 07 June 2004 9:40 pm in rec.boats Rick wrote:

Chris Newport wrote:

Sorry but you are wrong. For a given throttle opening the same volume
of less dense air passes through the carburettor venturi. The partial
vacuum created in the venturi is smaller, sucking less fuel into the
airstream and thus giving a weak mixture. Thus larger jets are
required at altitude to enrich the mixture.

You been running engines on JaxWorld or something?

Hey - stop baiting the wrong guy.
I spent many years tweaking engines (mostly rally cars but some boats)
in South Africa for high altitude operation. Unlike Jax I actually know
my facts. Living at 6000 feet can be interesting.

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