Fuel injector recommendation?

[GRGT1994]

I've got a question about my fuel injectors. I'm going with a 347 stroker setup, and I'm wondering whether my current injectors will still cut it.

Here's what's changing from the sig below. I blew my stock block, so I am getting a 347 stroker with a custom cam, upgraded springs and track heat intake. Pretty much everything else is staying as is.

So I figure the new setup might flow a bit more with the new cam and intake. But the main thing is the displacement.

Will the 30 lbs/hr injectors still cut it? Do I need to bump those up? If so, recommendations?

Thanks guys.

 

[TrueBlue95GT]

30lb/hr injectors should do the trick as long as you aren't revving too high or plan on doing some kind of power adder.

 

[ProKiller]

they should be fine to run but i think you'd max out the duty cycle in the higher RPMs. if it was me, i'd step up to 42s to future proof.

 

[earleys94gt]

Fuel Injector Selection:

Injector HP Ratings: divide flow rating by .5 and multiply the result by the number of injectors. The following examples use a 100% duty cycle. These ratings are for N/A engines at the flywheel.

Example:

19 lb injectors/.5 = 38 - 38 x 8 = 304 HP
24 lb injectors/.5 = 48 - 48 x 8 = 384 HP
30 lb injectors/.5 = 60 - 60 x 8 = 480 HP
36 lb injectors/.5 = 72 - 72 x 8 = 576 HP
42 lb injectors/.5 = 84 - 84 x 8 = 672 HP

The preferred duty cycle is about 85% maximum, so for a safety factor multiply the final figure times .85.

304 HP x .85 = 258 HP for 19lb injectors
385 HP x .85 = 326 HP for 24lb injectors
480 HP x .85 = 408 HP for 30lb injectors
576 HP x .85 = 490 HP for 36lb injectors
672 HP x .85 = 571 HP for 42lb injectors

Remember that the above ratings are at 39 PSI. Increasing the pressure will effectively increase the flow rating. Example: a 19 lb injector will flow 24 lbs at 63 PSI, and a 24 lb injector will flow 30 lbs at 63 PSI.

See Automotive Performance Software / Interactive JavaScripts Calculators to get the calculators used in these examples.

The above information is courtesy of jrichker!

This should help you decide...

It is over in the Fox forum... http://forums.stangnet.com/690222-h...uel-injector-compression-etc-information.html

 

[revhead347]

30lb will be fine. I'm using 30lb injectors on a dry kit, and putting down almost 500rwhp.

Kurt