Royal Windsor
|
|
32-Valve Cylinder Heads for your
Small Block Ford |
|
For about the price of a blower,
you can have 32 Valve technology |
|
 UNPRECEDENTED
Horsepower and Torque |
|
Bolt
on Design |
|
Supercharged
Power Without the Hassles Of Heat, Pressure & Detonation |
|
|
Download Ford 32 Valve
Brochure |
|
|
A bolt-on for all 5.0/351 and larger
Windsor motors. The dual 1.65" intake valves have a curtain flow area
(Diameter of the valves X height of lift) of a
single 3.3" intake valve and dual 1.4" exhausts equal to a single 2.8"
valve. This yields flow and H.P. not attainable with a standard two
valve head.
|
|
|
(Click image for larger view) |
While many "race" heads are
struggling to flow 300 cfm at radical lifts of 0.700" or more, Arao
Engineering Inc. has developed 32-valve aluminum cylinder heads that flow
400 cfm at just 0.600" lift! |
|
Faster Flow!
Like other Arao Engineering 32-Valve Cylinder Heads, these
not only flow more air but flow much more during the earlier stages of lift.
So not only do you get more at full lift, you get far more early, which
means you get more complete cylinder filling. |
|
|
|
|
|
(Click image for larger view) |
Combustion chamber side of
head showing centrally located spark plug, two intake valves and two exhaust
valves. The squish band comes in from all corners, accelerating the air
towards the spark plug. Making it the fastest burn, least prone to
detonation of any combustion chamber possible. With this advantage the
compression ratio on pump 92 octane fuel can be half a ratio higher than
with a two valve head.
In supercharged,
turbocharged or nitrous applications, this also means more forced induction
can be used with less chance of detonation. Also even though there is more
exhaust valve area with the two exhaust valves, it is accomplished with a
smaller valve. These smaller valves are less likely to glow red and
pre-ignite the mixture in severe duty applications.
Notice stock head gaskets
can be used, and all water holes are located in the exact same location to
come through the gasket as in a stock head. |
|
Combustion chamber volume
is 64cc standard. Can be varied from 58cc to 78cc. Stock flat top pistons
can be used from 9.0:1 to 10.5:1. For higher compression ratios pop up
pistons are available. Valve notches required if camshaft larger than .550”
lift and 244degrees @050.
The “B” heads for 4.0” to
4.060” bore size has valve sizes of: Intakes 2@ 1.650” each. This has a
curtain flow area (perimeter of valve X height of lift, the actual flow
window, of a single intake valve of 3.300” diameter. And Exhaust sizes
2@1.400” each. This has a curtain flow area of a single 2.800” exhaust
valve. This is why the 32 valve heads can produce well over 100 hp more than
the best 2valve heads on the market today.
The way this curtain flow
area works in the 4 valve per cylinder application is this. The performance
gain with the 4 valves per cylinder is not so much at peak valve lift, (an
engine is only at peak valve lift for a very few crankshaft degrees), but
the flow advantage it has all the way up to full lift and all the way down
after full lift. This is when the cylinder is getting more fully charged on
the intake stroke and more fully excavated when on the exhaust stroke. For
example, at only .050” valve lift the 4 valve head is already flowing 50%
more air than the 2 valve head at the same lift.
Also camshafts can be run
that have a wider lobe separation and less duration for the same
application. The wider lobe separation purges less intake charge straight
out the exhaust when at low speed. This less purging makes for more low end
torque, less emissions, and less fuel consumption. Also camshafts with
approximately 10 degrees less duration for the same application can be used.
This still makes much more overall power than the 2 valve heads, but has the
same RPM characteristics where the peaks occur.
Most
of the time we prefer mechanical roller camshafts. This enables us to run
the spring pressures that enable the extra RPM capability of the 4 valve
heads. With hydraulics, the springs have to be lightened up to enable the
hydraulics to work properly and this cuts into the extra RPM capability.
|
|
(Click image for larger view) |
View shows intake ports that bolt up to
all standard high performance manifolds. This particular head uses a Yates
raised runner intake manifold for racing purposes. View shows intake divider
in port that splits one intake port into two for both valves. Also shows
intake rocker that uses one pushrod to open two valves simultaneously. |
|
|
(Click image for larger view) |
View showing motorsports “N” exhaust
flange bolt pattern. Use Motorsport flanges and Fel-Pro “N” exhaust gaskets.
Visible are the 2 exhaust valves merging into one port. Also shows how one
pushrod operates 2 exhaust valves simultaneously. Rocker arms ride on needle
bearings and are shaft mounted, similar to Chrysler Hemi rockers. One
pushrod operates both valves simultaneously with individual adjusting screws
for each valve. Rocker arms are investment cast of 4340 Chromoly and heat
treated. Needle bearings and shafts are Torrington. Heat treated shims on
ends of rockers are pre-set for end play. View shows stock high performance
head bolt studs can be used with 12 pt. nuts. |
|
|
|
|
|
Download Ford 32 Valve
Brochure |
|
|
|
For more Information |
|
|
|
|
|
info@araoengineering.com |
|
|
|
|
|
|
|
|
|
|
|
