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Original Message
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| RE: hp, and the 390gt intake vs the performer rpm |
| By Gerry Proctor - 09/26/2002 3:31:15 PM; IP 207.133.188.254 |
There is no statistically significant difference, other than weight (doesn't apply to the PI), between the Performer RPM and the CJ intakes. They have a different solution toward the same problem which is air flow. The CJ/PI uses large decreasing diameter runners (like the old Edelbrock F427) while the RPM uses a large plenum with constant diameter runners. While the RPM may be a more efficient design, I've never seen any indisputeable flow numbers or track testing that indicates one offers a higher level of performance over the other. Of course, you need to look at the carburetor tuning to optimize either manifold. I suppose it all comes down to whether you want to use a factory manifold or a more easy to come by aftermarket piece.
And to the question on the "S" intake. While it has marginally larger runners that the other more pedestrian FE intakes, I wouldn't exactly call it a performance piece. Sure it was used on the 390GT but it's a far cry from a CJ intake's airflow capacity. |
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