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Original Message
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| RE: flow numbers |
| By Mel Clark - 08/18/2001 1:30:49 PM; IP 64.12.104.164 |
There should be an improvement but there could be some problems also. Any time major mods are done to the intake or exhaust ports a flow bench should be used. First to establish a baseline of what the heads flow stock as well as any variation between cylinders. There is no way to guess what the results of the work performed are without a flowbench.
Back in the early '60s when Ford was doing a lot of research in cylinder head design they published a paper with the S.A.E. which detailed the efforts and relults of many modifications in the combustion chambers, intake and exhaust ports as well as valve head design. In this paper the described how the removal of as little as .010 from some areas could disrupt the flow charecteristics enough to cause a loss of airflow of as much as 10% with a corresponding loss of horsepower. This paper further stated that the 427 H.R. engine produced 540 HP while the 427 M.R. engine produced 539 HP and that was the reason for the demise of the H.R. engine in Ford's race program. It's too bad they didn't eliminate the light weight valves at the same time. IMNSHO :) |
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