[Diy_efi] Fuel rail sizing

[Grant Beaty]

Thanks Dave. Do you know anything about Fuel Pulsation Dampeners? Supras
come stock with one (its pretty restrictive, most people remove it). W/o it,
injector noise increases at idle, but I'm wondering if they would work at
WOT as well. From what I understand, they decrease the volume in the system
slightly when an injector fires, but who knows if it responds fast enough
for WOT...

Grant

-----Original Message-----
From: Dave Dahlgren <ddahlgren at snet.net>
To: diy_efi at diy-efi.org <diy_efi at diy-efi.org>
Date: Tuesday, September 03, 2002 10:17 AM
Subject: Re: [Diy_efi] Fuel rail sizing


>All the Supra race engines I have worked on had a 3/4 inch od rail about
0.035
>wall thickness in stainless steel. If it going to be a batch fire system it
is
>about impossible to build one too big if sequential i have found the
demands to
>be a little more modest in the way of peak flow demands as you are only
turning
>on one injector at a time.
>Dave Dahlgren
>
>Grant Beaty wrote:
>>
>> Does the diameter of a fuel rail need to be larger than that of the fuel
>> line itself? (like a plenum on an intake manifold?) I've got my stock
fuel
>> rail in front of me, its a side-feed rail, and it has the same diameter
as
>> the 6 AN fittings welded onto each end. Its got 6 550cc injectors, which
>> seem to be prefectly happy running %100 duty cycle all day long (although
I
>> will not likely run them that high), do I need a larger fuel rail? (Yes I
>> have searched the archives before posting this)
>>
>> Thanks for any help,
>> Grant Beaty
>> '97 Toyota Supra
>>
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