[Diy_efi] Lucas Injector Flow Spec Request

Dave Dahlgren ddahlgren at snet.net
Tue Feb 25 10:33:46 GMT 2003


This chart is very helpful if the following things are taken into
consideration..

Injectors are generally flowed with Stoddard solvent and the correction rate is
typically 10.4 to relate to gasoline.. cc/min/10.4=lbs/hr gasoline Typical
gasoline is 0.775 and race gas varies from 0.69 to 0.795 you also have to
account for oxygenated gas as you need more of it per hp than non oxygenated
fuels. So the hp ratting in this chart is interesting but somewhat useless if
you consider the range of fuels and then the relative efficiency of an engine
that can vary from 0.38 bsfc to 0.65 depending on compression ratio, chamber
design, camshaft and supercharge/turbocharge plus other factors.

typical bsfc #'s
0.38 to 0.42 high compresion N/A
0.45 to 0.50 low compression N/A
0.48 to 0.55 turbo
0.55 to 0.65 supercharged mechanicaly belt driven etc..

so flow in (lbs/hr corrected for fuel specific gravity) / bsfc / 1.1 =
hp/injector with a 10% head room so they don't run static with a non oxygenated
fuel if oxygenated reduce by another 3 or 4 %..
that means a 25 lb/hr injector can support 60 hp in one engine(high compression
N/A non oxygenated) and only 34 in another (supercharged + oxygenated)depending
on operating conditions..
Dave


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