FIC is a highly respected fuel injector specialist. He backs his claims with documented testing:

https://fuelinjectorconnection.com/pages/videos

The above green injectors are described as “dual spray. wide cone/split cone”. The pattern is designed to direct the flow from a single injector into the separate ports of two intake valves. If you confine that dual cone flow into the single path leading to a single intake valve, the fuel that has been carefully atomized by the injector ends up coating the walls of the intake port, losing a degree of atomization. The object is to get the bulk of the atomized fuel to enter the combustion chamber in an atomized/suspended state, uniformly distributed by the air flow through the valve curtain. A single spray, narrow cone is more likely to accomplish that.

A simplified attempt at explaining a complicated system that is attempting to maintain atomization in a complex, curved path, with obstructions, an indeterminate point at which the fuel particles vaporize, flow stopping and starting, with widely variable mass flow rates, and who knows what else. But I think we have to assume that the engineers who chose to use an injector with a dual cone pattern in very high performance engine with 2 inlet valves per cylinder weren't just guessing it helped.

 

I couldn’t have said it better myself! BTW thanks for the videos I actually enjoyed watching them!

 

Wanted to go back to the earlier comments that indicate a 30 #/HR injector is adequate for your needs. I believe that comment was based on the MPH in your signature "12.40@111 2.2 60' before build - hotcam and full bolt ons".

But I believe you are looking for injectors for your new build "377, AFR Street Eliminators, LE custom cam, full MSD/6AL
LTs, PCMForless, SLP, Performabuilt stg 2 w/ 2500 stall, 52mm.".

If that's the case I think you would be better off with a 36 #/HR injector. Typical guideline I have used for safe injector sizing (85% DC, 0.476 #/HR/HP BSFC) is to multiply flywheel HP by 0.07. Working backwards, you get:

30 #/HR - good for up to 428 (flywheel) HP

36 #/HR - good for up to 514 (flywheel) HP

42 #/HR - good for up to 600 (flywheel) HP

That is a bit less conservative than the typical online injector sizing programs, that us 0.500 BSFC and 80% DC (yields a multiplier of 0.08). In my experience, injectors have become more suitable for higher duty cycle, and current street engine tech/head design/quench/etc. is yielding much more efficient (= lower) BSFC.

 

Thanks gentlemen

 

Good talk. Have a nice day.....

 

Injuneer - you are correct. That time is my old setup. I will look at some 36# injectors.

Thanks everyone for the input.

 

From what I understand, the split pattern will not target the back of the valve. I did some research on this a couple of years ago and my take away was don't use the newer Ford injectors with a split pattern on a 2V engine....can create fueling issues.

Injuneer found the video I was looking for......this one....