HOW TO BOOST REFERENCE APOWER VALVE FREE

There are other reasons as well so feel free to contact our Technical Service department for further help. The blower moves quite a bit more air through the engine and if the exhaust is restrictive it will back up the pressure into the cylinders and show a higher boost reading with no gain. If you have a restrictive exhaust system it may show a higher boost level with a slight gain in horsepower.

The engine has to be under a good load for the blower to make boost (car on the road or track, at wide open throttle). The blower WILL NOT make any boost on a free engine rev. If you do not have the correct drive ratio for the blower it may also build less boost. If the camshaft has less than a 110 lobe separation it can cause the boost pressure to bleed out of the exhaust instead of building cylinder pressure. If enough air canвЂ™t pass through the blower it will not make boost. If the carbs are too small or you are running a restrictive air cleaner this can cause a lower boost. Carburetor size, air cleaner flow, camshaft size and lobe separation, engine load, exhaust size, and blower drive ratio are just a few. There are a lot of variables that will determine boost output on one combination to the next. This will tell you what the blower is doing on your combination. Consult you local Holley dealer or our Techline for the correct application. We offer quite a few different size blower carbs with this already done. This can be done by most carb modifiers or even yourself. Now you will have vacuum on the power valve at an idle, and when you hit the gas as the boost builds, it will force the power valve to open and richen up the main system. A steam PRV should not be used for warming up a steam distribution line. The warm-up is modulated and controlled during the start-up procedure. The warm-up valve warms the steam line within recommended time frames for the steam line. You will run a vacuum line to the lower intake manifold from the new vacuum nipple. Bypass valves and warm-up valves should be used in all PRV installations. You then insert a vacuum nipple in this hole. Then you drill a hole in the side of the main body into the hollowed out vacuum chamber for the power valve. You plug the vacuum feed hole in the baseplate for the power valve. To remedy this there is a modification you can have done that is called manifold referencing the power valve. The power valve will never open and you will have a lean condition. On a blower with the carb mounted above the rotors there is constant vacuum all the time even under wide open throttle. When the vacuum drops below the rating of the power valve, it snaps open and richens up the main system. When you step on the gas the throttle plates open and the engine vacuum drops as you accelerate. On a normally aspirated engine the engine vacuum at idle will hold the power valve closed. The power valve is installed to keep the engine from loading up and running rich at an idle. There is a thing you need to know about the power valves on a roots style blower engine. You want plenty of fuel available for the engine to use. Nothing will kill a blower or Nitrous engine quicker that a lean condition.

How to boost reference apower valve