Sizing fuel injectors for your latest hot rod or racing powerplant isn’t terribly difficult, after all there are plenty of suppliers who will tell you what to buy and why, and yet somehow folks seem to get it wrong way too often. How much horsepower you are making clearly impacts what size injector you need, but it also depends on what fuel you are running, boost levels, etc. Of course fuel pressure matters as well, but not as much as some of the other details.

In this video Richard Holdener talks us through the finer points of fuel injector sizing and just how you should calculate your needs. And in typical Richard fashion there is not only lessons to be learned but also fun to be had. Watch the video, do the math, and let us know just how much injector you need for your ride.