bluemonster1
LIFE MEMBER ONLY ONCE!!!
just wandering if any of you use the power jets from Thunderproducts.Did some reading on it and seems very interesting to me.It is different from the dial a jet system.Would like to hear some of your comments on the products.Seems to make for simple adjustments in variable weather and temps.
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bluemonster1
LIFE MEMBER ONLY ONCE!!!
SnowTech Article
Here's a new twist on an old method; adding a power jet to a carburetor. Remember those? Simple power jets have been used for years as a method of improving the calibration on bigger carbs, like what sleds use. A Power jet consists of a fuel pickup in the bottom of the float bowl, connected through a fuel hose to a spray nozzle that protrudes into the incoming air stream going into the carburetor.
How and why is this an advantage? Using a power jet allows you to lean down the main jet circuit with far less fear that the engine will seize on top end, as the power jet supplies the rest of the fuel needed on top end. This has several advantages. Throttle response improves dramatically, and since most riding is done at partial throttle settings, fuel economy is improved as well. Power is improved at any temperature or elevation.
What makes the Thunder PowerJet different from a “simple” power jet is that it is adjustable! It has a Viton needle valve (needle and seat) for precision adjustment. It allows for extra fuel to be added to the total fuel delivery, adding to the fuel from the rest of the carb jets. It can be set to the tune of adding zero fuel, all the way to adding as much fuel as a 500 main jet can supply. Think of it as giving you an external adjustment of around 10-12 jet sizes, minimum! A large knurled knob with an index pointer makes adjustment easy (and no more digging into the carburetor).
The strongest fuel signal is in the 1/2” circle in the center of the carb bore. The further away you move from the center of the bore, the later the TPJ comes on. Fuel flow will begin at approximately half throttle delivering progressively more fuel and reaching maximum efficiency in the 3/4 to full throttle range. The TPJ will improve mid to top end throttle response and protect you from leaning out with extended full throttle runs.
The TPJ is great for piped engines because power comes on at higher than stock rpm’s, so fuel can be easily added in this area without suffering through a rich condition in the lower rpm areas. It also works extremely well on turbo, nitrous and blower applications.
A one-way check valve is included, so you don’t have to suck the fuel all the way from the float bowl. The TPJ body and all hardware are nickel-plated to resist corrosion, and the viton seals on the adjustable needle and seat are compatible with all fuels, including race gas and alcohol.
Some may wonder how this differs from a Dial-A-Jet. The Thunder PowerJet is not air corrected like a Dial-A-Jet, so there’s no mixing chamber or emulsion mixture. This is raw fuel being delivered here. Thus, the range of adjustability in terms of total fuel delivered is greater.
Mountain riders can calibrate their sled to work best at any elevation. As they come down the mountain they can add fuel to maintain safe ratios. Or, let’s say you wake up and the temps are colder than your jetting is safe for. No problem, tweak your TPJ and add some more fuel, quickly and easily. The options are many.
Add the Thunder PowerJet to any carbed engine and you instantly gain the benefit of (quick and easy) external adjustability. Then add to it the benefits of having a powerjet. Generally, the bigger the carbs and larger the engine, the greater the performance benefit. Big bore twins are prime candidates (like ones with 38mm, 40mm or honking 44mm Mikuni carbs). Sleds with smaller carbs would still see gains and would also benefit from the external adjustability.
Each kit comes with complete instructions and necessary mounting hardware. Installation is easy and tech support is available. Twin carb kits sell for $119.95, and single carb kits go for $64.95. One of each and you’ve got enough for a triple. Call Thunder Products at 320-597-2700 or visit www.thunderproducts.com
Here's a new twist on an old method; adding a power jet to a carburetor. Remember those? Simple power jets have been used for years as a method of improving the calibration on bigger carbs, like what sleds use. A Power jet consists of a fuel pickup in the bottom of the float bowl, connected through a fuel hose to a spray nozzle that protrudes into the incoming air stream going into the carburetor.
How and why is this an advantage? Using a power jet allows you to lean down the main jet circuit with far less fear that the engine will seize on top end, as the power jet supplies the rest of the fuel needed on top end. This has several advantages. Throttle response improves dramatically, and since most riding is done at partial throttle settings, fuel economy is improved as well. Power is improved at any temperature or elevation.
What makes the Thunder PowerJet different from a “simple” power jet is that it is adjustable! It has a Viton needle valve (needle and seat) for precision adjustment. It allows for extra fuel to be added to the total fuel delivery, adding to the fuel from the rest of the carb jets. It can be set to the tune of adding zero fuel, all the way to adding as much fuel as a 500 main jet can supply. Think of it as giving you an external adjustment of around 10-12 jet sizes, minimum! A large knurled knob with an index pointer makes adjustment easy (and no more digging into the carburetor).
The strongest fuel signal is in the 1/2” circle in the center of the carb bore. The further away you move from the center of the bore, the later the TPJ comes on. Fuel flow will begin at approximately half throttle delivering progressively more fuel and reaching maximum efficiency in the 3/4 to full throttle range. The TPJ will improve mid to top end throttle response and protect you from leaning out with extended full throttle runs.
The TPJ is great for piped engines because power comes on at higher than stock rpm’s, so fuel can be easily added in this area without suffering through a rich condition in the lower rpm areas. It also works extremely well on turbo, nitrous and blower applications.
A one-way check valve is included, so you don’t have to suck the fuel all the way from the float bowl. The TPJ body and all hardware are nickel-plated to resist corrosion, and the viton seals on the adjustable needle and seat are compatible with all fuels, including race gas and alcohol.
Some may wonder how this differs from a Dial-A-Jet. The Thunder PowerJet is not air corrected like a Dial-A-Jet, so there’s no mixing chamber or emulsion mixture. This is raw fuel being delivered here. Thus, the range of adjustability in terms of total fuel delivered is greater.
Mountain riders can calibrate their sled to work best at any elevation. As they come down the mountain they can add fuel to maintain safe ratios. Or, let’s say you wake up and the temps are colder than your jetting is safe for. No problem, tweak your TPJ and add some more fuel, quickly and easily. The options are many.
Add the Thunder PowerJet to any carbed engine and you instantly gain the benefit of (quick and easy) external adjustability. Then add to it the benefits of having a powerjet. Generally, the bigger the carbs and larger the engine, the greater the performance benefit. Big bore twins are prime candidates (like ones with 38mm, 40mm or honking 44mm Mikuni carbs). Sleds with smaller carbs would still see gains and would also benefit from the external adjustability.
Each kit comes with complete instructions and necessary mounting hardware. Installation is easy and tech support is available. Twin carb kits sell for $119.95, and single carb kits go for $64.95. One of each and you’ve got enough for a triple. Call Thunder Products at 320-597-2700 or visit www.thunderproducts.com
bluemonster1
LIFE MEMBER ONLY ONCE!!!
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Bluemonster2
New member
Looks very interesting Doug, way better than the dial a jet.
bluemonster1
LIFE MEMBER ONLY ONCE!!!
Scott that is what is on your v-max. Remember them little black boxs attached to the carb boot clamps.They have a slot to turn.So you were running great that day with me.Your sled is crisp of the line in mild weather.You will have to turn the setting to richer on colder days. That is why your mains so low..like really low.On the power jets..you drop around 20 to 25 % less in jetting size and the power jet takes over.
bluemonster1
LIFE MEMBER ONLY ONCE!!!
Scott.it is supposed to snow starting Monday and even next Saturday and the weather is basically staying below 0.Maybe a ride next weekend.They are saying so far up to 10 cm's..but that can change... 
