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Automotive Performance Parts: |
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Ram Air Cleaner / Cold Air Intake
Flow Plate / Shear Plate / Blended Carb Spacer
Spread Port Tunnel Ram Intake Manifold
Engine Designer: Configuration and Performance Prediction
SplineDyne: NURBS Spline based cam lift design software
Crankshaft balancing and counterweight design software
CAD Modeling
CNC Programming
Casting and Foundry Tooling Design
Plastic Part and Mold Design
Product Design
Software Development
Harley Engine and Trans CAD Models
Chopper Frame Hard Tail CAD Models
Harley Forward Controls CAD Models
Automotive Engine CAD Models
Many more, send email for more information
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Ready to Manufacture Designs: |
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Billet CNC Hemi Cylinder Head
Billet Carburetor
Fuel Injection Manifold for BBC (conventional head)
Gen III LS1 Valve Cover
Steel Rocker Arm
Chopper Frames
Water Pumps
Principle: Ram Air is the effect whereby air is encouraged to enter the engine at a much higher rate
than would be expected through the mechanical action of the engine by itself. This is similar to
the effect of forced induction, but without the need for a turbo or supercharger.
Fact: Cold air is denser than hot air and therefore takes up less space. As such, if your engine
can ingest cooler air, more air can be mixed with more fuel, which in turn provides more power.
An additional benefit is that cooler air has a higher resistance to knock, allowing more ignition
timing advance, or boost in supercharged applications. Either way, they both equal more power.
This is the theory behind cold air intakes, ice on the manifold, intercoolers, manifold insulators, etc.
The RAM AIR Cleaner is a twin snorkel, high capacity air cleaner housing used to supply fresh air to an
engine. It is based on the popular 14" open element air cleaner. The RAM AIR Cleaner is a two-piece,
injection molded composite unit,
The benefits of cooler air, teamed with forced induction, have long been understood.
Air Inlet Systems is dedicated to maximum performance, be it power or economy. When you increase
efficiency, both may improve. The 60's were full of air-grabbing ideas. Everybody had something.
Then the fuel crunch of the early 70's ushered in the emissions era. Only the odd insurgence had
been noted until GM re-introduced the RAM AIR on the Trans-Am and Z-28 in 1996. Today, all
manufacturers use some sort of fresh air inlet systems.
A typical scenario would have an individual looking to improve his engine's breathing capability
by installing an open element air filter and removing his single-snorkel original equipment air filter.
What he has gained in air quantity, he lost in air quality. This, in effect, may void the potential gains.
With the RAM AIR Cleaner, he can truly decrease air restriction in the inlet track and retain the fresh
air benefits. With the RAM AIR CLEANER, he truly feels the performance improvements due to the modification.
Although the cooler air is mandatory, there is another great benefit to be had with the RAM AIR CLEANER.
The fact is that when we drive down the road, we are pushing air with the front of our vehicle. That is
a source of high pressure air. The potential pressure head at the grill is approximately 2" of hg.
This is available for the taking. With smooth ducting, most of that can be channelled into the air box.
Our 1/4 mile acceleration tests have yielded .2 to .4 of a second elapsed-time improvement.
Test vehicles have reported up to 3 miles per gallons improvements, over long periods. We generally
expect to see as much as a 10 % increase in power when installing an air box over an open element air
filter. Gains over factory single-snorkel / non fresh systems may even be greater. How to select a
RAM AIR CLEANER: The simplest way to determine which air box you need is by installing a 14" diameter
open-element air filter onto the vehicle.
Please keep in mind that cowl induction rear open-hood scoops are not wide enough to allow the twin
snorkel style RAM AIR CLEANER to tuck under them.
A ram-air intake is any intake design which uses the dynamic air pressure created by vehicle motion to
increase the static air pressure inside of the intake manifold on an engine, thus allowing a greater
massflow through the engine and hence increasing engine power.
The ram air intake works by reducing the intake air velocity by increasing the cross sectional area of
the intake ducting. When gas velocity goes down the dynamic pressure is reduced while the static pressure
is increased. The increased static pressure in the plenum chamber has a positive effect on engine power,
both because of the pressure itself and the increased air density this higher pressure gives.
Ram-air systems are used on high performance vehicles, most often on motorcycles and race cars. Ram-air
has been a feature on some cars since the late sixties, but fell out of favor in the seventies, and has
only recently made a comeback. Modern parachutes use a ram-air system to pressurise a series of cells to
provide the aerofoil shape.
At low speeds (subsonic speeds) increases in static pressure are however limited to a few percent.
Given that the air velocity is reduced to zero without losses the pressure increase can be calculated
according to:
dP / P = (v2) / (2RT)
An engine is basically an air pump, the denser the air (colder air is denser) the more oxygen the air
contains and the more efficintly fuel can be burnt and the more fuel can be burnt, first thing you
need to understand is its the differance in oxygen content of lower temp air (denser air) that the
engine sees not the temp. itself that effects the differance in potential hp
any system that sucks hot air from the engine compartment is not going to be very effective!
but a system that uses cool air routed from a high pressure area of the car at speed can significantly
help engine power , while the differance may be only 2% , better power above 100mph, that could easily
be 8-12 hp on a basically stock corvette, in your favor, more than enought to win, against a similar
not so equiped of equal power.
a correctly designed hoodscoop or under the bumper cold air intake can effectively lower the temp of
the air entering the cylinders by 60 degrees or more, if that intake design is placed in a high
pressure area at the front of the car or base of the windshield you can potentially gain a small
amount of additional air density at higher speeds, while your not gaining anything much at 30mph,
once you pass about 80mph theres a measurable differance in potential power to be gained depending
on the cool air intake design and placement
theres hundreds of designs some good, some useless but a car with a correctly designed ram air system
can easily gain 2-3% in hp over a similar car not so equiped at speeds over 100mph
keep in mind that 2% might put your car only a few feet ahead in a race but it takes only inches to WIN
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