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Old 06-25-2018, 10:16 AM   #1 (permalink)
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Cardinal Grammeter's Avatar
Join Date: Jun 2011
Location: PA
Posts: 46

TLC - '91 Geo Metro
90 day: 31.07 mpg (US)
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Optimum fuel economy balance between Fast Idle and Choke

On a 74 Datsun 620 pickup w/L18 & Hitachi DCH340 carb:

What is the optimum fuel economy balance between Fast Idle and Choke?

Engine has a thermostatically controlled air cleaner diverter valve to take air off the exhaust manifold on start and then transition to air cleaner snout.

And then there is tuning the choke spring which is difficult due to parts availability.

NOTE: I tend to run too little of each so I have to heel and toe blip for first 2-5 minutes after startup.


Last edited by Cardinal Grammeter; 06-25-2018 at 02:34 PM..
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