Most aftermarkets use 30degree spray angle. I think the stock ones are 15degree, but I'm not sure. Thanks for your help.

 

does that really matter? the fuel and air gets sucked into the combustion chamber anyway.. i dunno.. i have one bolt holding in my fuel rail, if this does affect fuel spray i'm in trouble

 

You should call RC engineering and ask them what the typical spray patterns are for the different nozzle designs: pintle, ball and seat, and lucas disc.

From what I know:

Siemen Deka, Nippon Denso, and Bosch are all pintle design.

Rochester's are ball and seat. These are the same kind that MSD and Precision use.

RC injectors are Lucas disc type.

If I'm wrong on any or all accounts, somebody please correct me. Viren (b18bturbo) seems to have a good grasp of the injector types, so maybe he'll have something to comment on.

 

RC uses the disc type and it's 30deg. Accel uses the pintle type and they also employ the 30deg angle. I know the stocks one are pintle type but I don't think they're 30deg.

The reason I asked is that I'm relocating the injectors further away from the port. If I know the exact spray angle of the injectors, I can adjust the injector seat angle so the spray cone can have more contact with the air rather than the wall of the runner.

 

bump for some knowledgeable guys

 

so what would the ideal angle be? wouldn't it depend on the velocity of the air coming in?

hmmmm....new riceboy product....injectors that vary angle with throttle angle and velocity of air incoming