exhaust port shapes
#1
hey
so i pulled my engine down today (bad water seals) its a 13b bridge port rx4 style, and i was going to get the exhaust ports opened up but when comparing them to a racing beat template mine were huge.
i will post pics up tomorrow of the port itself but what they have done is removed the exhaust sleeve and then cut the port into a large rectangle.
so my question what difference in charactiristics does a rather square port have over the usual "D" shaped port?
any insight would be much appriciated.
so i pulled my engine down today (bad water seals) its a 13b bridge port rx4 style, and i was going to get the exhaust ports opened up but when comparing them to a racing beat template mine were huge.
i will post pics up tomorrow of the port itself but what they have done is removed the exhaust sleeve and then cut the port into a large rectangle.
so my question what difference in charactiristics does a rather square port have over the usual "D" shaped port?
any insight would be much appriciated.
#2
Originally Posted by hsmidy' post='896229' date='Mar 9 2008, 11:16 PM
hey
so i pulled my engine down today (bad water seals) its a 13b bridge port rx4 style, and i was going to get the exhaust ports opened up but when comparing them to a racing beat template mine were huge.
i will post pics up tomorrow of the port itself but what they have done is removed the exhaust sleeve and then cut the port into a large rectangle.
so my question what difference in charactiristics does a rather square port have over the usual "D" shaped port?
any insight would be much appriciated.
so i pulled my engine down today (bad water seals) its a 13b bridge port rx4 style, and i was going to get the exhaust ports opened up but when comparing them to a racing beat template mine were huge.
i will post pics up tomorrow of the port itself but what they have done is removed the exhaust sleeve and then cut the port into a large rectangle.
so my question what difference in charactiristics does a rather square port have over the usual "D" shaped port?
any insight would be much appriciated.
In the turbo there will be back pressure nearly all of the time, and staying close to stock timing is one way to keep a bit of off idle torque for street driving. Making the port wider without changing the timing gets you the flow you want for the turbo without screwing the off turbo low speed torque. Leave enough to support the apex seals.
Thats a start.
Lynn E. Hanover
#3
Originally Posted by Lynn E. Hanover' post='896362' date='Mar 11 2008, 08:13 PM
Making the port wider without changing the timing gets you the flow you want for the turbo without screwing the off turbo low speed torque. Leave enough to support the apex seals.
Thats a start.
Lynn E. Hanover
Thats a start.
Lynn E. Hanover
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