injector size

Robin Lawrence · 03-23-2020, 01:44 PM

Boy this question can have a ton of correct answers. Minimum would calculate to about 40 PPH.
Based on an estimated 600 HP and a rough .45 BSFC that is around 33 PPH.
Add another 20% margin since we don't like to run injectors above 80% duty cycle and you get near 40PPH.

As said above you can run a larger set that can be timed to cam intake valve events giving some advantages depending on camshaft/intake design. I have seen some where it was not worth any gains. The feature can really help the Idle in come cases.

If you want to run sequential injector strategy you will need a cam sensor. It will allow the engine to run bit cleaner at low RPM and when you go up on the converter. It's usually not an issue with the smaller injectors to run batch or bank to bank strategy. Many older combinations run batch fire at close to 100% duty cycle. Some of those guys still use fuel pressure adjustments to fine tune their EFI rather than adjusting the base fuel map.

Hope this helps

Robin

03-23-2020, 01:44 PM	#4
Robin Lawrence Sponsor Join Date: Jan 2002 Location: Galesburg IL. Posts: 178 Likes: 260 Liked 717 Times in 121 Posts	Re: injector size Boy this question can have a ton of correct answers. Minimum would calculate to about 40 PPH. Based on an estimated 600 HP and a rough .45 BSFC that is around 33 PPH. Add another 20% margin since we don't like to run injectors above 80% duty cycle and you get near 40PPH. As said above you can run a larger set that can be timed to cam intake valve events giving some advantages depending on camshaft/intake design. I have seen some where it was not worth any gains. The feature can really help the Idle in come cases. If you want to run sequential injector strategy you will need a cam sensor. It will allow the engine to run bit cleaner at low RPM and when you go up on the converter. It's usually not an issue with the smaller injectors to run batch or bank to bank strategy. Many older combinations run batch fire at close to 100% duty cycle. Some of those guys still use fuel pressure adjustments to fine tune their EFI rather than adjusting the base fuel map. Hope this helps Robin __________________ STK 308 SS 3088