Читать книгу How to Install and Tune Nitrous Oxide Systems - Bob McClurg - Страница 19

Obviously, nitrous solenoids and solenoid micro switches go hand-in-hand. Not all carburetor throttle linkage is alike, so most single-stage N₂O kits come with a universal micro-switch mounting bracket, which the installer can modify to best suit the application. For one such example, check out the owner-fabricated micro switch bracket used in “Project: Nitrous Supply Powerstar 8001 for 350 Small-Block Chevy Installation” on page 23. Again, most major N₂O kit manufacturers offer a complete line of optional specific-application micro-switch brackets to fit most popular styles and makes of carburetors.

N2O solenoids and nitrous solenoid micro switches go hand-in-hand. The sole purpose of a micro switch is to activate the solenoids based on the position of the throttle. This is done by positioning the switch to come in at or near WOT using an adjustable micro switch bracket. Most single-stage N2O kits come with a universal micro-switch mounting bracket that you can personally modify to best suit the application.

With street applications, it’s a good idea to check your N2O solenoids at least once per year. When racing, it should be part of your routine maintence schedule. Problem areas that you want to be looking out for include the internal seal that rides up and down on the plunger, which can swell up, or get pinched or cut through normal use. The rubber seal inside the plunger can also be affected as it can swell up, under pressure. Checking the orifice for sediment buildup is another important step as well as checking the coil resistance. Typically, 1.2 to 1.4 ohms is ideal for a N2O solenoid and 20 ohms is ideal for fuel solenoids. NOS Pro Shot N2O (PN 16040) solenoid (left) and NOS Fuel Cheater (PN 16050) solenoids (right) are slated for rebuild. A visual inspection of both solenoids revealed a leaking problem due to bad seals, debris, and a cut seat. If professionally rebuilt by a shop like Nitrous Supply, cost for rebuilding a set of solenoids like these runs between $35 and $65.

Begin by removing the retaining nut from the top of NOS (PN 16050) Fuel Cheater solenoid housing using a small crescent wrench. The sole purpose of this nut is to secure the coil cover to the solenoid.

After securing the solenoid base in a vice, being careful not to get too aggressive clamping it down, use a spanner-type wrench available from Nitrous Supply to remove the stem from the base.

After the stem has been removed from the base, out comes the plunger with the internal seal or O-ring and return spring.

This comparison photo of N2O and fuel plungers shows the difference between good-condition (left) and worn plungers (right). It’s all in the seals.

Use a Volt-O-Meter to check the voltage output of the nitrous coil, which in this case reads 1.7 ohms. If the coil is bad it either reads “0,” signifying a dead short, or reads very high (around 22 ohms or more), signifying that the coil is stuck in the wide-open position.

An ultra-sonic cleaner is used to clean the solenoid’s internal components. If you don’t happen to have one of these units, carburetor cleaner can also be used. The point is to get every component as clean as possible.

Begin by placing a new NOS sticker, provided in the Nitrous Solenoid Rebuild Kit, onto the nitrous coil housing.

Install new rubber grommets on the solenoid housing.

Route the coil wires through the rubber grommets. This completes rebuilding the nitrous solenoid coil and nitrous-solenoid coil housing assembly.

This exploded view clearly shows the coil and coil housing, stem, plunger, seal or O-ring, and solenoid body ready for re-assembly.

With the solenoid body back in the vice, install a brand-new O-ring.

Install the plunger and spring onto the solenoid stem.

In goes the stem and plunder securely tightened, but not too tight, to avoid O-ring damage.

The coil and coil cover go on along with the retaining nut, and the N2O solenoid rebuild is complete.

It’s time to rebuild the NOS Fuel Cheater solenoid. Remove the retaining nut, the coil cover, and protective flux washer.

Remove the Fuel Cheater stem by using the spanner wrench available through Nitrous Supply.

Here is the completely disassembled NOS Fuel Cheater solenoid ready for rebuilding.

Check the voltage output on the NOS Fuel Cheater coil. This one comes up with an acceptable reading of 8 ohms.

After the coil cover is fully reconditioned, install a new NOS Fuel Cheater sticker.

Install the plunger spring, which fits into a receiver hole on the plunger, and O-ring into the NOS Fuel Cheater base, or solenoid body.

Tighten down the NOS Fuel Cheater solenoid stem (complete with flux washer) using a spanner wrench.

With the NOS fuel solenoid fully reconditioned, tighten the retaining nut that secures the fuel coil cover in place.

The fully rebuilt NOS Fuel Cheater solenoid.