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Old 03-28-2012, 06:32 PM   #25
Blackbirdws6
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Quote:
Originally Posted by LTb1ow View Post
Ok next question is how to determine whether you need the flow numbers provided by it.

Take total min flow number on intake tract,divide by 8 and compare to head intake flow number?
Basically this is more complicated than just taking the numbers you are using and dividing or generally comparing CFM #s. You need to look at the CFM for one chamber at its max and assume a % for the other cylinders. For instance, one of the valves for a given cylinder is at its max lift which will have a particular CFM. The other 3 cylinders with open intake valves with be at different lift and flowing different CFM. The largest number of the 4 cylinders with open intake valves is what your intake needs to supply.

There are other factors but that's the just IMO.

Assuming the following:

Max cylinder head flow - 250? + 180 + 130 + 100 = 660CFM

The assumption above would be for the 4 cylinders at various lift values but I basically guessed lol. My assumption is your intake mani ports will outflow the heads you will have on this thing so the restriction will be in the heads which you already know.
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