Dynojet 250i Dyno Dynojet Model 250i

Suzuki GSXR inletSuzuki GSXR inlet

Superflow SF120 flowbench Superflow SF120 flowbench

Superflow Flowbench

Race Developments use the latest in computerised flowbench technology to develop your engines breathing ability.

Everything from the cylinder head, to the induction system and exhaust system can be tested for efficiency and throughput.
By making small adjustments and then testing on the flowbench, changes can be proven or disproven and recorded without any human error in the input process.

With all results stored on computer database they can de analysed in detail afterwards. Predictions can then be made for the effect of changing engine specs on power and torque output.

Below is a graph showing the improvements made to a standard cylinder head with some stage 2 porting.
It shows flow capacity in litres per second on the y-axis and valve lift in mm on the x-axis. The lower blue line is the original intake flow and the upper blue is the modified one. Likewise, the green is the original exhaust flow and the red the modified one.
You can see quite clearly that flow has been improved throughout the lift range which is the key to porting a head.

It would be easy to just grind much bigger ports, but without careful attention to what the flowbench reads, the mid-range for example could have a massive hole in it.

In addition to recording the volume of air flowing through the ports, the flowbench can measure air velocity.
This is measured with a pitot tube at various points in each port as the image shows on the right.

All data attained is recorded automatically by the computer software so there are no errors with data entry.


The image below shows the port velocities for both the standard and modified cylinder heads for the graph shown earlier in this page.

Each port shown here had velocity readings taken from 9 different points in the port at 2 different lifts. The upper 4 circles are the standard head and the lower circles for the modified head.
The key in the middle shows air velocity in metres per second. Just as with the airflow graph earlier in this page, it is quite clear that air velocity has been improved dramatically. Note that the exhaust port velocities are higher at 5mm of lift on the modified head than they are at 10mm of lift on the standard one.

This engine not only has gained an increase in top end power, but has dramaticaly improved midrange. This increased engine torque will be noticed with the engine pulling harder earlier in the rev range.
It is the careful balance of all these factors which is key to producing a good power delivery.

Before modifying any cylinder head, we first find out the intended use with engine and camshaft profile specs and what the customer wants to gain from the engine. The cylinder head is then designed around this criteria. This means we do not sell "off the shelf" headwork, because every application, customer and engine are different.
As a result, each head is worked on in a costomised way so you will be getting the optimum improvements possible.

If you've not already looked, please see our Cylinder Head Work section for further information.