- Staff
- #1
Anybody who owns an LB7 knows about the injectors reputation. Many may have heard about the SAC nozzles that many have been switching to with excellent results. Until now though the smallest size you could get was 45 overs which required a retune, well not anymore. S&S in the next couple of weeks will be shipping out there all new SAC00 nozzles. They use the SAC nozzle design(the style used on LLY+) vs the stock VCO which seals 1 hole instead of 7 like stock. This has proven to be a much more robust/reliable design. And now with the SAC00, no retune is required. They have been designed and engineered to match stock flow, but do it with the SAC nozzle design. They're even CARB certified and legal in all 50 states.
And for those that don't know, VCO stands for valve covering orifice. This is where the pintle valve that seals the injector off seals off the actual injector orifices. This design was commonly used on injectors with actual injector pumps with a single orifice, but this is a hortible design for an injector with multiple orifices in a common rail system because the valve has to seal all the orifices together at the same time. If even 1 doesn't seal, you get a stream pf high pressure diesel pouring in the whole time its running. With a sac design, the injector orifices all tie into a small pocket, and then there is only 1 sealing point for the small pocket. This means there is only 1 sealing point in a tapered seat vs 7 sealing points where they have to seal against a flat face. This means you have a much more robust design with fewer failure points.
And for those that don't know, VCO stands for valve covering orifice. This is where the pintle valve that seals the injector off seals off the actual injector orifices. This design was commonly used on injectors with actual injector pumps with a single orifice, but this is a hortible design for an injector with multiple orifices in a common rail system because the valve has to seal all the orifices together at the same time. If even 1 doesn't seal, you get a stream pf high pressure diesel pouring in the whole time its running. With a sac design, the injector orifices all tie into a small pocket, and then there is only 1 sealing point for the small pocket. This means there is only 1 sealing point in a tapered seat vs 7 sealing points where they have to seal against a flat face. This means you have a much more robust design with fewer failure points.
