I was looking at the new technology of Fuel injectors and stumbled onto the Bosch EV14. The spray pattern is very fine and it represents the latest technology coming from Bosch. A google search will show videos of the differences in spray pattern. The EV14 is a uniform mist spray instead of what looks like a single or multiple streams of fuel. It turns out the most common EV14's are 48mm from o-ring to o-ring. This is shorter than the previous standard 60mm injector. On ebay you can get adapters to put 48mm injectors into cars that had 60mm. This got me thinking and I realized the shorter injector is the key to fitting an e30 fuel rail into an e21 manifold.
The injectors I used are Bosch # 0280158049 which is stock from 05-07 Chevy Corvette, 2007 Cadillac CTSV, 05-06 Pontiac GTO. The factory part number is 58023M. They are the smallest flow rated EV14 Injetors made. 28lbs at 45 psi. The size was a little bit of a worry being too big. I run them at 40 psi to cut down some of the fuel. My megasquirt logs show a max Duty Cycle of 74%. You are not supposed to exceed 80% duty cycle, so mine are just about perfect. My engine has 91mm pistons and an s14 crankshaft with a schrick 292 cam. If I wanted to get less flow rated injectors, I'd have to go to Bosch III mini which I think came on a ford focus and are also called bosch III ls1 mini injectors. They don't have as fine of a spray pattern, but come in smaller flow rates and are 48mm o-ring to o-ring.
This is my Bosch EV-14 Injector. I've added two orings the orange one came with the injector. It was sold as a +1mm oring. It measures 15.30mm OD x 8.75mm ID x 3.37mm thick. For good measure I added the green one which is a p009 11/32" x 1/2" x 5/64".
They fit snugly into the e-21 manifold. They also stay straight with the green o-rings allowing me to weld the threaded insert for the fuel rail.
