Exhaust Ports
#3
Don't forget to bevel the edge to 2mm to protect your apex seals from smashing into the closing edge of the port. Other wise they are nice and huge and will flow some serious exhaust. I tend to go a little smaller for street cars to help out with apex seal longevity. Nice job with porting to match your diffuser. Keep us updated with your results..
#5
I wonder if there is any pro or con to leaving a sharp edge on the opening side of the exhaust port; where the apex seal "drops" over the side.
And what differences are noticed with a slightly elliptical (curved) closing edge versus a flat closing edge?
And what differences are noticed with a slightly elliptical (curved) closing edge versus a flat closing edge?
#6
Originally Posted by Mazderati' date='Feb 13 2004, 06:38 PM
I wonder if there is any pro or con to leaving a sharp edge on the opening side of the exhaust port; where the apex seal "drops" over the side.
And what differences are noticed with a slightly elliptical (curved) closing edge versus a flat closing edge?
And what differences are noticed with a slightly elliptical (curved) closing edge versus a flat closing edge?
2: Rounded exhaust ports have a broader torque curve, with the torque peak occuring at a lower rpm than squared off ports. Squared off porks make the engine more peaky, but have a stronger top end than rounded off ports.
#9
Originally Posted by Mazderati' date='Feb 13 2004, 02:38 PM
I wonder if there is any pro or con to leaving a sharp edge on the opening side of the exhaust port; where the apex seal "drops" over the side.
And what differences are noticed with a slightly elliptical (curved) closing edge versus a flat closing edge?
And what differences are noticed with a slightly elliptical (curved) closing edge versus a flat closing edge?
Lynn E. Hanover