[Diy_efi] Throttle body size

[Merchant, Adnan]

Hi,

This is a subject that's been covered before so my apologies in advance.

How does one determine the correct size for a throttle body for an engine?
Flow rate is the most logical parameter but the few data points I have from
production engines only serve to confuse.   Here's what I've found so far:

Honda 2.0 non-VTEC: 55 mm
BMW 3.5 (M30): 65 mm (nominal, since it's tapered)
Mustang 5.0: 65 mm, 70 mm
Mustang 4.6: 70 mm

My application is a 3.0 straight six, normally aspirated, plenum style
intake.

Any suggestions on how to figure out the right size?   The original carbs
were twin SU, 2" throats.

Thanks,
Adnan

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