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CYLINDER HEAD
CONVERSIONS |
Gasflowed / Big Valve
Cylinder Heads for your
Motor Car, SUV, Truck / Bakkie & Bike | Petrol & Diesel

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| The
Gas Flowed Cylinder head |
| In the early
eighties, modified or gasflowed / big valve cylinder
heads were only ever found on racing cars. |
| Today gasflowed
/ big valve cylinder heads have become very
popular, given the current fuel pricing and huge
gap in price between the top and middle of the range
models, to enhance the power output of almost any
modern vehicle. |
| SAC Engineering
has all the latest equipment and technical expertise
to develop and gas
flow cylinder heads for even the most recently
launched petrol and diesel models. |
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Why does one Gas Flow a Cylinder Head? |
Simply
because this is what enhances the power. |
In order
to maximise the explosion within the combustion
chamber area of the cylinder head, we need to
let as much as possible air / fuel mixture into
the chamber. |
This
mixture enters the chamber through the inlet port
and is controlled by the inlet valve. |
Once this
mixture is in place and gets ignited by a properly
timed spark, the piston is forced downwards. |
The
bigger the explosion, the more the downward force
and the result is "More Power". |
After
the combustion stroke has taken place, the burnt
gas exits the chamber past the exhaust valve and
through the exhaust port into the exhaust system. |
This entire process is enhanced when the cylinder
head has been gasflowed. |
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How do we do it? |
Without
going into great detail for obvious reasons, we
use a flowbench on which we are able to measure
port flow before and after the head has been flowed. |
In most cases we are able to increase the flow
through a port by roughly 20%. |
This is achieved
by carefully removing sharp edges and rounding
acute corners, concentrating usually at the roof
of the port where the highest flow activity takes
place. |
We
remove as little material as possible to ensure
a lower overall port volume. |
Depending on the
requirement, in most cases we tend to go for high
flowing, small, high velocity port, which produce
good top end power with virtually no bottom end
loss. |
A great deal of time is spent on the valves
and valve seats, where we gain good air flow with
small valve openings. |
The combustion chamber as
well as the exhaust ports are also changed considerably
to promote more complete combustion. |
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Performance enhancement packaging makes sense |
You
need to remember that there are many ways of increasing
the power and torque of a vehicle - bolt on kits,
tuning chips, airfilter changes and exhaust system
modifications mention only a few. |
But, you
need to understand that the big gain comes from a good combination of all of these
bolt ons and tuning techniques packaged with a good cylinder head flow job. |
The cylinder
head will always be the key component of a performance
enhancement package on any normally aspirated
engine. |
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Engineering
Services
- Cylinder Heads - |
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Gasflowed
heads for most Petrol and Diesel vehicles |
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Full
reconditioning of all heads |
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Flowbench
developed heads |
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Full
race heads |
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Big
valve head conversions |
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Solid
lifter head conversions |
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Motorcycle
heads |
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Lineboring |
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Pressure
testing |
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Aluminium
and Cast iron welding |
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| A
few of the Benefits of Gasflowed Cylinder
Heads |
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Optimum
power & torque |
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Lower Maintenance
costs |
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No visual
change in the engine bay |
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No risk
of overheating |
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More Power
and Torque
(Especially when towing) |
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Excellent
value for money |
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Improved
fuel consumption |
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Fewer Gear
changes |
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Improved
fuel consumption |
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Quicker
throttle response |
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Cleaner
burning engine |
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Reliable
performance |
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Flowbench
developed |
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6 months
/ 20 000km Warranty |
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| PERFORMANCE VALVES... |
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Cylinder
head conversions, modifications and upgrades are available
for Alfa, Audi, BMW, Chev, Chrysler, Colt, Ford, Honda, Hyundai,
Isuzu, Jeep, Kia, Mazda, Mercedes, Mini, Nissan, Opel, Toyota,
Volkswagen and more... Click
Here to view the list of vehicles. |
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