[Gmecm] Understanding injection system acronyms

[Robin Handley]

Ah, so there can be multiple throttles/butterflies in all of them(?)

Reason for asking is that the one throttle/butterfly and injector per
cylinder is v. common amongst my fellow car builders, and I have been
planning to go that way (replacing my DCOE 40s) with GMECM.

Thanks,

Robin

----- Original Message -----
From: <davesnothereman at netscape.net>
To: <gmecm at diy-efi.org>
Sent: 13 May 2006 20:23
Subject: Re: [Gmecm] Understanding injection system acronyms


> 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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