the cylinder page

Cylinder prototypes are finally done! They have been completely machined, bored, nickasil plated, honed and finished... they are really ready to go, now! Here you are:

As it can be seen from the pictures, the two prototypes have different internals (look at the exaust flange). Different diagrams, different port shape, different time-area, etc. etc.
There are various alternatives for exaust and transfer ports, which I can insert into the mould prior casting in various combinations. I want to test the various configurations at the dyno before starting the real production.
More news coming soon... stay tuned.

Literally hundred hours of late night work were spent in thoroughly redesigning the cylinders in order to adapt them to the RG while preserving reliability and performances.
The internal (transfer and exaust ports) is state of the art and comes from engines that are currently racing: I signed a NDA (Non Disclosure Agreement) to be allowed to use them and that's why I purposedly omitted more revealing pictures.
Some features are described in the following.

General info:

aluminum-magnesium alloy cast cylinders
nickasil plated
bore x stroke: 54 x 54.4 mm
displacement: 498 cc
O-Rings between cylinder and head
heads made of two parts, the internal chamber is detachable and available in various materials and shapes
compatible with standard RAVE valve

Ports:

tranfer ports: 5
exaust ports: 3 (1 main + 2 boosters)
Ports are available in different options (shape, size and timing)

The prototypes you see in the above pictures have different internals. We'll test them both at the dyno to see how they go.
I know you all want to see numbers and pictures (power curves). If I wil be allowed, I will publish data as soon as I'll have it.

Bolting:
There is an adapter plate being machined now. Here is a picture showing the partially done object:

The cylinders together with the adapter plate will bolt-on the stock RG cases with no modifications required.
It was not possible to make cylinders that would bolt directly on the stock RG cases without an adapter plate because of a number of geometric constraints.

Water passages/cooling:
The cylinder has abundant cooling; exaust port and valve are water cooled too. As you can see in this picture, the cylinder casting has been specifically modified with two "tunnels" to match the rear water input of the RG:

The two "tunnels" come conveniently pre-drilled for a appropriate water flow but there is extra metal so it is possible to increase the water flow if needed.

Last updated: 09 Dec 2008