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Carb setup for gas with ethanol

Started by 66FBCharger, September 26, 2011, 11:27:15 AM

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66FBCharger

September 26, 2011, 11:27:15 AM
Here in the Northeast (CT.) we have gas with 10% ethanol added year round. Should the carb jetting be adjusted differently than if the car were to be run on 100% gasoline? I would think the carb should be richer.
The reason I ask is I have been driving my recently purchased 69 R/T (440, Edelbrock AFB carb, headers (engine is stock as far as I know, other than the carb and headers). It feels like I have a lean surge. As I am cruising at part throttle the car seems to surge ever so slightly. I haven't done much with the car other than drive it and enjoy it. I want to start tweaking things to getting them working perfect.
Any input would be appreciated.
'69 Charger R/T 440 4 speed T5, '70 Road Runner 440+6 4 speed, '73 'Cuda 340 4 speed, '66 Charger 383 Auto
SOLD!:'69 Charger R/T S.E. 440 4 speed 3.54 Dana rolling body

Chryco Psycho

#1
September 26, 2011, 07:40:19 PM
it requires 40% more alcohol to make the same power as pure gas , so I would suggest approx a 4-5% up jet to compensate + you get the added bonus of lower fuel economy  :2thumbs:
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