Which injector is better: single or multiple pinholes?

kalvinlk · Post by **kalvinlk** » Mon Aug 21, 2006 9:34 am

I bought a set of bosch 315cc injectors. They are a Ford Motorsport application. When I look at the end, they have a single pintle design which looks like it will spray a nice even cone. Other injectors I have seen or used have, rather than a visible pintle, a little plate in the end with two or four pinholes. What is the advantage of each? I am running a 4 cylinder 16v VW motor. The individual intake ports split into two channels, one for each intake valve, and have a dividing wall between the two. From what I've read, an injector with two pinholes pointed at each of these channels is ideal. Is there a problem with running a single cone?

Thanks.

Minami Kotaro · Post by **Minami Kotaro** » Mon Aug 21, 2006 9:58 am

I have used both. The disc-type seem to work a lot better.

kalvinlk · Post by **kalvinlk** » Mon Aug 21, 2006 10:12 am

OK, so the ones I purchased, without a plate with multiple pinholes, more than likely atomize less fuel.

Is it THAT big of a difference that I should start shopping around for a nicer set? What will be the drawbacks; less torque, worse idle and worse emissions?

I found these two pics of spray pattern, and can now see the superiority of the disc style. First picture is pintle style, like I bought, second is disc style, like I want