cleavor
4th Gear Member
Joined: Jun 2006
Posts: 1,264
From: Eke, Belgium
RE: cleavor
This is completely confused me. To me 4v used to stand for 2 inlet and 2 outlet valves on the car hence a 4 cylinder in 16 valves. Having discovered the world of carbs 4v means 4 venturi's now 3v to me mean 1 inlet and two exhaust hence 12v as used by some VW 4 cylinders. So standard push rods should be 2 valve per cylinder 3v is possible as restrict exhaust is a problem on normal exhaust manifolds but 3 valves is not normal on us car engines. When atom talks about 4v being bigger he means bigger flow properties of a 2 valve head to accommodate the higher amount of fuel and air from a 4 venturi carb. I hope this helps!!
5th Gear Member
Joined: Oct 2006
Posts: 3,305
From: west chester
RE: cleavor
the 4v is a reference to the carb not the head itself althougth the valves were bigger tocompenssate for the bigger carb. the 2v heads had a 2 barrel carb and smaller valvesto compensate for the smaller carb. the 3v is a marketing tool to see show the compromise of the 2 and 4v heads.
5th Gear Member
Joined: Dec 2005
Posts: 3,806
From: DFW
RE: cleavor
ORIGINAL: paddy187
This is completely confused me. To me 4v used to stand for 2 inlet and 2 outlet valves on the car hence a 4 cylinder in 16 valves. Having discovered the world of carbs 4v means 4 venturi's now 3v to me mean 1 inlet and two exhaust hence 12v as used by some VW 4 cylinders. So standard push rods should be 2 valve per cylinder 3v is possible as restrict exhaust is a problem on normal exhaust manifolds but 3 valves is not normal on us car engines. When atom talks about 4v being bigger he means bigger flow properties of a 2 valve head to accommodate the higher amount of fuel and air from a 4 venturi carb. I hope this helps!!
This is completely confused me. To me 4v used to stand for 2 inlet and 2 outlet valves on the car hence a 4 cylinder in 16 valves. Having discovered the world of carbs 4v means 4 venturi's now 3v to me mean 1 inlet and two exhaust hence 12v as used by some VW 4 cylinders. So standard push rods should be 2 valve per cylinder 3v is possible as restrict exhaust is a problem on normal exhaust manifolds but 3 valves is not normal on us car engines. When atom talks about 4v being bigger he means bigger flow properties of a 2 valve head to accommodate the higher amount of fuel and air from a 4 venturi carb. I hope this helps!!
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