Sunday, October 19, 2014

Vacuum advance

The original carb, or fuel injection, has a vacuum line running to the distributor for a vacuum advance. This means that as more air is drawn through the carb it advances the distributor timing. There is no provision for this in a dual carb set up so I drilled and tapped a vacuum line in each intake runner. These lines will lead to a manifold from which one line will lead to the distributor providing a constant vacuum for the advance. The dual carbs create a situation where there is a carb barrel for each cylider and it is therefore necessary to pull vacuum from each individual runner for that constant vacuum. 
In any case, I got more done today than I thought I would and maybe this beast will get under the car some evening this week.