PRV Performance, Golden, Colorado, is developing PRV induction, Pintle-Regulated Venturi fuel Induction system which replaces the intake manifold on an engine and provides throttling, fuel injection and homogeneous mixing of the air and fuel at each cylinder. The system has demonstrated fuel efficiency improvements of 14% to 25%, torque and horsepower increases, and significant reduction of emissions.
PRV works as follows:
- Air enters the contoured Venturi via an air filter.
- Fuel vaporizes and expands in the low pressure throat.
- Fuel vaporization induces air flow into the Venturi entrance.
- Fuel vaporization in confined space thrusts mixed charge into the engine.
- Charge is always homogeneously mixed and cooled because the pintle regulates air flow at the confluence of fuel and air.
PRV describes the process as follows: PRV induction, with fuel injection directly at the Venturi throat, effectively mixes fuel and air due to the high velocity and reduced pressure at the vapor-liquid contact region, while pressure is recovered in the expansion section. Fuel vaporization in the confined Venturi volume amplifies air flow into the PRV entrance.
Characteristics and Benefits of PRV Induction:
- Fuel economy is dramatically improved. Fuel is vaporized and thoroughly mixed with air even at low throttle.
- Dynamometer tests prove torque and horsepower are substantially increased, even at low rpm.
- Green house gas emissions are reduced. Independent emission testing by Air Care Colorado demonstrated a substantial reduction in vehicle emissions for CO, CO2 and NOx.
- PRV cost is comparable to a conventional manifold/throttle body induction system.
Eight generations of prototypes have been installed and tested in a 1993 Honda Civic revamped with a JDM D15B single overhead cam engine. Prototype number 8 is currently undergoing tuning and testing.
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Results of dynamometer testing on the 1993 Honda Civic, showing the improvement in horsepower (top curves) and torque (bottom curves), are shown in the graph to the left (click to enlarge). The stock JDM D15B single overhead cam engine results are shown in red and the PRV system in blue.
A prototype vehicle incorporating a PRV system is available for you to drive according to this page on the website.
U.S. Patent 6,868,830 introduces the concept of a Pintle-regulated Venturi (PRV) for premixing mixing fuel and air at all throttle settings for an internal combustion engine (ICE).
This is but one of the many ideas to improve the performance of ICE engines that have been proposed over the years. Who knows which ones will succeed. I find it interesting to present some of these ideas to induce your comments. This one seems to me to have some merit in its conception, being a rather simple idea. The idea seems to center on producing a homogeneous mixture of air and fuel just prior to entering each cylinder. Using a pintle to throttle the air at each cylinder, in conjunction with the venturi and fuel injection, certainly improves the fluid dynamics of the process. The key is to whether the mixing at the venturi throat actually results in improved performance and better fuel economy that is sufficient to cause the automobile industry to change its model on fuel induction or whether it is cost effective enough to create an after market. Carefully controlled laboratory tests are not usually the same as can be obtained in the real world with drivers having widely varying driving habits.
All material used in this post, except my comments, are derived from material on their website.
My sceptical light is flashing brightly on this one. This looks a lot like throttle body injection, which GM was using 15 to 20 years ago. The main difference I see is a pintle throttle valve rather than a more conventional throttle plate. This would give more uniform air flow, especially at low flow. Using one PRV system per cylinder could allow higher power and torque compared a single throttle body injector ahead of a manifold (as GM did it), but I don't know that this would improve part-throttle efficiency.
This could be a "straw man" set-up. The original fuel system met all the emissions regulations. A system that runs lean (rather than exact fuel-air ratio like the original system) will give better efficiency, but also produces high oxides of nitrogen (NOx). NOx is hard for a catalytic converter to clean up in the presence of excess oxygen (lean condition). So the story is incomplete without some discussion of emissions.
Posted by: donb | October 17, 2007 at 10:22 AM
I'm skeptical too. The mileage given (39 city, 49 highway) is comparable to the 2008 Civic hybrid (40 city, 45 highway according to fueleconomy.gov). It's hard to believe that a simple induction change would trump all of the engine and energy recovery features in a late model Civic.
Posted by: pbean | October 17, 2007 at 12:25 PM
buying gas has become a major investment decision, as in "do i invest in some food so i can get thru the day or some gas so i can get where i have to go?" It should never be this way but it is. But that doesn't mean we have to just suffer. There is a real solution in Water4Gas and you owe it to yourself to check it out! http://w4g4mpg.info
Posted by: Garko Novis | May 13, 2008 at 03:47 PM
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Posted by: Carlos Barrera | January 21, 2010 at 08:07 PM
PRV Performance which replaces the intake manifold on an engine and provides throttling, fuel injection and homogeneous mixing of the air and fuel at each cylinder. The system has demonstrated fuel...
Posted by: evaporative emissions testing | April 20, 2010 at 02:22 AM
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Posted by: Engine Additive | October 18, 2010 at 06:15 AM
While reduced engine noise is of benefit to you, it comes from an intake tube with multiple turns and bends. The result is a drop in the volume of air delivered to the combustion chamber. And, because your stock intake system completely confines the air box in your engine compartment, the air is usually hot when taken in. This combination of limited and warmer air causes fuel-rich combustion mixtures that don't burn at maximum power efficiency.
Posted by: CGS Motorsports | August 11, 2011 at 08:22 PM
Everything is improved. Not to mention it's also environment friendly.
Posted by: CGS intake | August 11, 2011 at 09:22 PM
PRV Performance which replaces the intake manifold on an engine and provides throttling, fuel injection and homogeneous mixing of the air and fuel at each cylinder.
Posted by: r4 card | October 15, 2011 at 12:00 PM
It is good that they have developed something like this. The innovative mixture preparation is particularly advantageous for ethanol fueled engines.
Posted by: Chevy HHR cold air intake | January 17, 2012 at 08:26 PM