Smaller diameter primary tube on exhaust manifold
Posted: July 19th, 2012, 6:56 pm
One of my exhaust manifold primary pipes has had a bump on it for some time now. Must have gotten hit by a high bump on the road, maybe a speed bump.
On that particular cylinder, the vacuum of the carb barrel at idle is 10-15% stronger than the others and I have to compensate for this by opening the air bypass screw a little on the dellorto carb.
Not sure if that is just coincidence or anything to do with the slight collapse of the inner diameter of the primary reducing the escape of the gases from that valve..
Just curious.
Regards
Chris
On that particular cylinder, the vacuum of the carb barrel at idle is 10-15% stronger than the others and I have to compensate for this by opening the air bypass screw a little on the dellorto carb.
Not sure if that is just coincidence or anything to do with the slight collapse of the inner diameter of the primary reducing the escape of the gases from that valve..
Just curious.
Regards
Chris