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Old 12-04-2018, 05:03 PM
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Location: Adelaide, SA
Cobra Make, Engine: 289FIA 'English' spec.
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I'm not an expert on this, so it's just my opinion here....

If we’re talking, for example, about a Ford 302W, it has a firing order of 1-5-4-2-6-3-7-8
In a Cobra application, typically we have completely separate exhausts for the right bank (cylinders numbers 1-2-3-4) and the left bank (cylinder numbers 5-6-7-8) with no X-connector between them.
So looking back at the firing order for one complete cycle, there are cylinder numbers 1-space-4-2-space-3-space-space exiting right, and numbers space-5-space-space-6-space-7-8 exiting on the left.

If we’re looking for equal length individual pipes to the collector and we have no connection between the two sides, wouldn’t that then be a pointless exercise?

If the application is a GT40 replica, then we have a proper crossover system that correctly phases the individual pulses to achieve efficient scavenging of exhaust gas.


Cheers!
Glen
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