Alex22
Veteran Member
I finished up my swirl meter the other day and have been porting and testing since. I am using a Superflow SF600 flowbench with a clay radius leading into the intake port and an 80mm bore adapter. The swirl meter is mounted in the bottom of the adapter. My baseline test is a stock AHU head. All that I did to the head was clean all the gunk out of the port, glass bead the port then lap the factory valve job to be sure it was still sealing. The injector and glow plug holes are blocked.
The reason that it says <300 RPM at .050 lift is because at that low if swirl is present it is not enough to move the meter but at the same time I cannot say that there is no swirl. Since I'm not done with the testing the other flow and swirl numbers are not worth posting. When I have some results worth posting I will put them up. My goal is to improve the airflow and swirl, or at the least to improve the flow without decreasing the swirl.
After some porting I flowed the head again at 28" and then again at 42", when I converted the numbers back to 28" they were within 1 or 2 CFM, at least the port doesn't have a huge problem with flow stability.
I have not been able to find any other published swirl numbers for TDIs, has anybody else ever found any or had some done and would like to share? The only published swirl numbers I have found are for BB Chevy's and SB Fords there isn't much in common for that data to be useful here.
~Alex
The reason that it says <300 RPM at .050 lift is because at that low if swirl is present it is not enough to move the meter but at the same time I cannot say that there is no swirl. Since I'm not done with the testing the other flow and swirl numbers are not worth posting. When I have some results worth posting I will put them up. My goal is to improve the airflow and swirl, or at the least to improve the flow without decreasing the swirl.
After some porting I flowed the head again at 28" and then again at 42", when I converted the numbers back to 28" they were within 1 or 2 CFM, at least the port doesn't have a huge problem with flow stability.
I have not been able to find any other published swirl numbers for TDIs, has anybody else ever found any or had some done and would like to share? The only published swirl numbers I have found are for BB Chevy's and SB Fords there isn't much in common for that data to be useful here.
~Alex