Peeps

I have a theory that the link pipe for the secondary air pipe has a negative effect on the tuning ( such as it is) of the exhaust

I did an experiment on my tubular manifold a few years ago where I blocked it off so each port was closed and found the airflow was increased at lowish rpm ( 3000rpm or so)

sadly no dyno results to back this up but being as I had to add more fuel I felt it was worthwhile

had to switch back to the OEM manifold because of the usual cracks and falling to bits of the tubular bit


has anyone else tried this ?

 

Plenty of people have removed the secondary pump and blocked off the port, but not sure about power gains. What makes you say there's more airflow? I don't really see why it would do anything but if you have data let's see

 

Please note I'm not talking about just the removal of the secondary air pipe and capping off the port into the manifold
I mean to close the entry point from the engine side so you have to weld or screw something into each port so there's no communication between ports into the pipe