LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Injectors

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Old Sep 3, 2008 | 05:21 PM
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i was wondering if anyone new a good injector poundedge to run if running a 383?
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Old Sep 3, 2008 | 05:29 PM
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Usually 37s or 42s depending on the cylinder heads and camshaft.
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Old Sep 3, 2008 | 05:31 PM
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I have a set of 37's haven't put them in yet but should be plenty, My buddy is running 42's and its a bit over kill with his "mild" 383
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Old Sep 3, 2008 | 05:37 PM
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Yeah thats what I thought, my friend gave me a set of 30lb. Ford injectors for free and was thinking they might be to small.
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Old Sep 3, 2008 | 05:48 PM
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I wouldent go with anything lower than the 37s, you would be just hurting yourself..
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Old Sep 3, 2008 | 06:16 PM
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So what set or type of injectors do most run, like make and model #.
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Old Sep 3, 2008 | 06:31 PM
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From the calculator:

Horsepower (at the flywheel) 375
Number of Injectors 8
B.S.F.C. * .5

Max Duty Cycle ** 80%


Required Injector Static Flow Rate @ 43.5 psi 29.2968lb/hr

* Brake Specific Fuel Consumption: is the amount of fuel consumed (in lbs. per hour) for each horsepower made. This should be .45 to .50 for naturally aspirated engines, .55 to .60 for supercharged engines, and .60 to .65 for turbocharged engines.
** Maximum Injector Duty Cycle should be around 80% max for safe operation. This allows for some future horsepower increases.


475HP needs 37#, so not knowing what kind of 383 you built, it's hard to tell. Those SVOs are going to be 31.6# on GM fuel pressure. Also keep in mind this is estimated off flywheel HP.
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Old Sep 3, 2008 | 06:38 PM
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Thanks that helps!!
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Originally Posted by Formula350
From the calculator:

Horsepower (at the flywheel) 375
Number of Injectors 8
B.S.F.C. * .5

Max Duty Cycle ** 80%


Required Injector Static Flow Rate @ 43.5 psi 29.2968lb/hr

* Brake Specific Fuel Consumption: is the amount of fuel consumed (in lbs. per hour) for each horsepower made. This should be .45 to .50 for naturally aspirated engines, .55 to .60 for supercharged engines, and .60 to .65 for turbocharged engines.
** Maximum Injector Duty Cycle should be around 80% max for safe operation. This allows for some future horsepower increases.


475HP needs 37#, so not knowing what kind of 383 you built, it's hard to tell. Those SVOs are going to be 31.6# on GM fuel pressure. Also keep in mind this is estimated off flywheel HP.
That's exactly how to determine what you need.
42#s should be plenty for a N/A or wet N20 application.
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