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Best 2xDCOE manifold for B20?

1971Gold142 said:
Also the carb chart is useful but they are going off of 70's fuel. I had to increase both my main and idle jets by 2 steps...
Click to expand...

Interesting....

Is this for European Octane Ratings vs USA? (RON vs R+M / 2)
A77rHe1.png
 
1971Gold142 said:
Also the carb chart is useful but they are going off of 70's fuel. I had to increase both my main and idle jets by 2 steps...
Click to expand...

The difference might be due to 10% (ish) ethanol added to almost all pump gas these days? ECU cars just bump up fuel delivery a little, carbs either run lean or get adjusted richer.
 
Yeah I believe you are right about the ethanol added to modern pump gas making a difference. I read somewhere while researching how to tune up DCOEs that manufacturers have had to increase jet sizes to make up for modern pump gas.
 
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