[Gmecm] Understanding injection system acronyms

[davesnothereman at netscape.net]

TBI = injection on the atmospheric side of the throttle butterflies.

PFI = port fuel injection, injection on the engine side of the 
butterflies

MPI = Mult- port injection, marketing name for PFI

MPFI, same as MPI

TPI, Tuned Port Injection, marketing name for specific intake system 
using PFI and curved, tuned length runners.

DFI, Direct Fuel injection, fuel is injected directly into the cylinder.

Look to exotic car makers for marketing names for multiple butterfly 
manifolds.  As far as the injection type, use the position of the 
injectors relative to the throttle butterflies to determine injection 
type.

Zaphod

-----Original Message-----
From: Robin Handley <Robin at FuryWorld.fsnet.co.uk>
To: gmecm at diy-efi.org
Sent: Sat, 13 May 2006 19:53:22 +0100
Subject: [Gmecm] Understanding injection system acronyms

   I've been scratching my head over this for a while. Could somebody 
tell me
if I've got these right:

TBI = TPI = just one big throttle body/butterfly that feeds all
cylinders/ports, and one great big injector at the body
PFI = just one big throttle body/butterfly that feeds all 
cylinders/ports,
and one injector near the engine end of each inlet runner (i.e. one 
injector
per cylinder)

What do you call a system which has multiple throttle bodies/butterflies
(i.e. one throttle body/butterfly for each cylinder/port) and multiple
injectors (i.e. one injector for each cylinder)?

Robin

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