M20 Injectors - Why use m50?

[Winh]

Trying not to re-revive this thread, but I may be in the same boat as Dodobrown, as sometimes I have a gas smell, and mostly everything is stock, except magnaflow muffler and CAI.
I have a 325is 88'
Trying to fix that issue, and to increase power, if i only want to run the usual bolt-on mods, should I just stick with the 17 lb m50 greentops ?

[mr.vang]

I bought and installed the M50 bosch injectors, 17lb, for my m20 (with chip) and feel it helped my performance and starts. One of the best upgrades I ever did.

This is where I got my rebuilt ones from.

http://www.ebay.com/itm/BMW-E36-M3-3...item2ed1d34377

Your 20+ years old injectors are tired, so of course with a fresh set installed, you'll feel a difference. I rebuilted my stock injectors and see the improvement right away.

[ADEN]

Reviving the thread and adding my experience with green injectors car runs great with them idle steady but when my O2 sensor starts to act i got the worse gas mileage runs super RICH, maybe ecu stays at open loop and use the base map and signal width for fuel.

[PEZ2]

My experience with both green and pink tops is they don't work in m20 engines very well. My understanding is it's because they Type E twin cone spray pattern designed to be used with 4 valve engines. Each cone sprays on the centerline of each intake valve. Since the M20 has a single intake and the BMW M50 split cone is 17 degree about 50% of the fuel is being sprayed on the lower walls of the intake port. A type C center cone 4 pintle would be a better option. I have had better experience with these on M20 applications.

[bleblanc03]

Which of these Type C injectors have you used? I just bought green tops and a D'Sylva EAT chip for my M20B25 2.7 stroker build. bleblanc03 | 09.89 Alpine 325is | Find me on the Crest Friday mornings! | @beauschmo

[PEZ2]

I am running Bosch 0280150943 which are 19lb at 3 bar and about 17.5 at 2.5 bar (325e FPR). These are found on lots of Ford cars and are yellow top Bosch L jectronic connectors like an e30. Don't get any which does not have both the Ford oval and The Bosch ( what ever it is in the circle). There are tons of "fakes"

[digger]

My experience with both green and pink tops is they don't work in m20 engines very well. My understanding is it's because they Type E twin cone spray pattern designed to be used with 4 valve engines. Each cone sprays on the centerline of each intake valve. Since the M20 has a single intake and the BMW M50 split cone is 17 degree about 50% of the fuel is being sprayed on the lower walls of the intake port. A type C center cone 4 pintle would be a better option. I have had better experience with these on M20 applications.

You never want to spray the port with fuel that's how you get liquid fuel into the engine which doesn't burn. A single central cone around 20-25* (iirc) maximum will ensure you hit the hot valve or even better phased to hit the hole (back of valve when valve is open), I always look for stuff used on 2V engines as the easiest way to ascertain a decent spray (without flowing it on a test bench)