Direct Port Nitrous - Plumb Like A PRO - Nitrous Power!

Once the welding is complete, it's important to clean up the intake ports to ensure airflow is not disrupted any more than it needs to be (hence the flush mounting of the nitrous nozzles). Next, aluminum left over from the drilling and welding was ground out, and the bungs were tapped for their nozzles and ported smooth with a cartridge roll for a clean finish.

Speedtech's Jason Sharp says, "We use 577 Loctite on all the threads of the nitrous nozzles-this prevents any vacuum leaks." And since these threads are all running into the manifold, it would be unwise to use Teflon tape or pipe sealant, as debris from these materials could enter the combustion chamber. With all the nozzles installed, we bent the tubing and mounted the fuel and nitrous solenoids.

If you want to get those precision lengths and mandrel bends for your nitrous tubing, it's a good idea to invest in a pipe cutter and a pipe bender. Once your measurements are achieved, slide your tube in through the cutter. Tighten the cutter, then roll the cutter wheel against the tubing until it separates-remember to flare the ends. To get to bendin', insert the tube into the piping tool. Lock the tube in place and bend it over to create a perfect 90-degree angle.

Speedtech built 175 nitrous-ready manifolds last year, so we understand if your bends aren't perfect. To keep all the tubes free of irregularities, Terry first decides where he wants to place the solenoids. He started by taking measurements and proceeded to cut the bends accordingly. Sharp suggests bending all (four from each side) at the same time and repeating the steps for the other side.

Each side of the manifold supports a fuel and nitrous solenoid. If that fuel solenoid looks small, that's because it is. Sharp explains that they can run a smaller solenoid because it's the jet that controls the flow of fuel or nitrous, not the solenoid. When hiding solenoids away from the manifolds or when adding multiple stages, the smaller solenoids offer greater space under the hood, especially when trying to run a shorter cowl or in case you need the extra room when wrenching on the motor. Don't be fooled, though, this fuel solenoid has been tested to support up to 600 hp.

These Tech1 nozzles are unique in how nitrous and fuel are introduced to the runners. As nitrous swirls downward and flows around the brass fuel tube, a low-pressure area is created and a vacuum is generated. This vacuum is what pulls the fuel down and out of the nozzle.

Traditionally, nitrous nozzles are designed to introduce the nitrous to the airflow by impeding and protruding through the roof of the intake runner. However, when Speedtech installs its Tech1 nozzles, they are measured and cut to be kept out of and away from the direct flow of air. Here, you can see the nozzle is flared out and countersunk into the port.