Injector Enlarging... - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

mct3351 · 06-01-2005, 08:39 PM

The factory KA injectors can be made to flow 500 plus cc/min by enlarging the four holes on the end to 0.36mm using a drimel and a cobalt .36mm bit from http://www.mcmaster.com. I took mine to a jeweler. After enlarging the flow pattern remained the same and they didn't leak.

The original idea can be found at.
http://forums.nasioc.com/forums/show...hreadid=495810
http://forums.nasioc.com/forums/show...1&page=1&pp=25

Before

After

With end removed

After enlarging the injectors they need to be flow tested to ensure they all flow within 3% of one another.
SR injectors have larger holes than KA from the factory and the holes are further apart to begin with. I would imagine that after enlarging an SR injector they could flow well into the 600's maybe even 700. I haven't had a chance to mess with a set of SR injectors yet.

I also rigged up a homemade tester using a fuel pump, some line, the factory fuel rail, a air pressure gauge, a car battery and a graduated cylinder. All you have to do is establish fuel pressure in the rail then open the injector for one minute. Measure the amout that came out and thats you cc/min. Repeat for accuracy.
If anyones interested i can post up a picture of my set up.
Questions...

06-01-2005, 08:39 PM	#1
mct3351 Leaky Injector Join Date: Nov 2004 Location: Oklahoma Posts: 117 Trader Rating: (4) Feedback Score: 4 reviews	Injector Enlarging... The factory KA injectors can be made to flow 500 plus cc/min by enlarging the four holes on the end to 0.36mm using a drimel and a cobalt .36mm bit from http://www.mcmaster.com. I took mine to a jeweler. After enlarging the flow pattern remained the same and they didn't leak. The original idea can be found at. http://forums.nasioc.com/forums/show...hreadid=495810 http://forums.nasioc.com/forums/show...1&page=1&pp=25 Before After With end removed After enlarging the injectors they need to be flow tested to ensure they all flow within 3% of one another. SR injectors have larger holes than KA from the factory and the holes are further apart to begin with. I would imagine that after enlarging an SR injector they could flow well into the 600's maybe even 700. I haven't had a chance to mess with a set of SR injectors yet. I also rigged up a homemade tester using a fuel pump, some line, the factory fuel rail, a air pressure gauge, a car battery and a graduated cylinder. All you have to do is establish fuel pressure in the rail then open the injector for one minute. Measure the amout that came out and thats you cc/min. Repeat for accuracy. If anyones interested i can post up a picture of my set up. Questions...