06-05-2018, 08:40 PM
Would expect reduced wiper vac to correspond with more power!
Like thousands of others I slavishly followed the Williams book and labouriously filed the venturi out of the side manifold.
But it is not a restriction, just a proper transiton to the small manifold. Without cutting them open I get the impression that the horizontal part of updarught manifold may be slightly larger. Perhaps someone can comment.
On my side draught car I found an inlet manifold same style (made out of pipe fittings!) but little over an inch i.d. no advantage. Probably too large.
Like thousands of others I slavishly followed the Williams book and labouriously filed the venturi out of the side manifold.
But it is not a restriction, just a proper transiton to the small manifold. Without cutting them open I get the impression that the horizontal part of updarught manifold may be slightly larger. Perhaps someone can comment.
On my side draught car I found an inlet manifold same style (made out of pipe fittings!) but little over an inch i.d. no advantage. Probably too large.