Originally Posted by wrench459
I'm more interested in the intake.
Tuned exhaust is only worth a few ponys...but if match the intake with the exhaust flow in the correct proportions.. then you talking.
Nice work Bob.
Are you using the 80 percent flow rate to intake?
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I have to agree about the exhaust on a nearly stock engine. But when you start making decent power with hot cams (like 4x the rear wheel HP of a stock 1.9 Opel), then the exhaust definitely makes a difference!
On the bare head flow, I strive for 75-80% exhaust flow.
Normally when the header is fitted, the exhaust flow will increase another 4-5 cfm.
On this particular EFI intake, the manifold chokes the airflow by about 20 cfm over a bare port. Not great, but far better than the 'stock' carb'd intake that was previously used on this head (2.4). Usually the final numbers are closer to 90-95% exhaust flow once the manifolds are bolted in place.
Here's the
old thread where I tested a bare 2.4 intake port, a Dbilas DCOE intake manifold, and the 3.0 litre EFI intake manifold.
HTH,
Bob