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Thread: 2x4 intake
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09-09-2004 #1
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Thanks for the input Andrew. Do you think 2000cfm would be to much? I have always been told for EFI the more cfm the better. the plan for the engine is a 427ci small block.
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09-09-2004 #2
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With a bit of imagination, you can use oddball intakes and do so fairly cheaply. My intake started off as a tunnel ram lower and I'm using twin Honda throttle bodies because they were free, reasonably sized, and had a 0-5V TPS signal that my FAST ECM could recognize. I didn't have a lid for mine or I would've probably adapted it; instead, I made a sheet metal and billet flange and lid for it with tube inlets in front (more convenient for a turbo motor).
You could use two of nearly any EFI throttle body with adapter plates to bolt them to a carb baseplate. One of the Mopar mags even had an article where they used the bottom of a carb for the throttle body, with a carb spacer forming the "air horn" above the throttle blades. It's just easier to use EFI throttle bodies because you get an existing TPS and IAC in most cases.
09-09-2004 #3
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Turbo City was working on a dual TBI setup that would be pretty cool on a crossram manifold instead of a tunnel ram. Check out Dual TBI
69 Z28, original JL8 4 wheel disc brakes, crossram, TI, radio delete, heater delete - being restored
70 Camaro SS396 L78 Canadian car
09-10-2004 #4
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You should be OK with 2000CFM total. With EFI the CFM ratings are not nearly as critical as they are for a carburator.
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09-10-2004 #5
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Andrew,
Any idea why they cast that base with such a small intake port? Probably to help with the torque since it's replacing a TPI on a lot of applications.
I just wished they had a little more meat there; Don's car has intake ports with a #1206 Fel Pro gasket; they literally extend beyond the outside of the casting! We're trying a smaller gasket and hoping we can get it to seal.
Jody
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