[Gmecm] Re: injection acronyms, injector placement

[William Lucke]

I've never heard of a diesel that didn't have direct injection... I 
thought that was a staple of diesel operation in order to ensure that 
the combustion event occured at the proper time... like spark timing on 
a spark ignition engine. Which ones weren't direct?


> From: davesnothereman at netscape.net
> Subject: Re: [Gmecm] Understanding injection system acronyms
> 
> Yep.  Injection type depends on placement of injectors, not number of 
> throttle plates.  Diesels have either indirect or  direct injection and 
> no throttle plates.
> 
> Individual throttle barrels may need a common connection for MAP 
> reference to work with a  speed density system.
> 
> Zaphod
> 

I'm aware that the ricers do it... It's my opinion that extra injectors 
with a turbo kit are just a bandaid because the turbo kits that include 
extra injectors do not include correct engine management (this applies 
no matter how pretty the billet aluminum housing is... it's still a 
billet aluminum bandaid). I was referring to well setup and correctly 
managed engines that are just too big for single injector per cylinder 
(like 3,000 HP alcohol burners running 40# of boost on 10:1 compression).


> From: davesnothereman at netscape.net
> Subject: Re: [Gmecm] Understanding injection system acronyms
> 
> -----Original Message-----
> From: William Lucke <william.lucke at highspeedlink.net>
> To: gmecm at diy-efi.org
> Sent: Sat, 13 May 2006 19:32:38 -0400
> Subject: Re: [Gmecm] Understanding injection system acronyms
> 
> 
>   In extreme racing engines, particularly dragsters, it is possible to 
> run both PFI and TBI at the same time... PFI supplies fuel at idle and 
> low throttle and when the PFI injectors get maxed out, the larger TBI 
> injectors start spraying. This allows the latent heat of vaporization 
> of the fuel to cool the intake charge and supplants the need for 
> intercooling in alcohol fueled forced induction cars.
> 
> It's not just extreme racing engines.  The ricer crowd will add 
> injectors pre TB when adding a turbocharger to a N. A. engine.  New 
> cars, old tricks.
> 
> Zaphod