Your shopping cart is empty.
Product Qty Amount


Use the sub category list on the right to refine your search.

Spring Retainers

[email protected]
The development of a race engine is most often concerned with maximising efficiency. An integral part of many engine development projects is improved ‘breathing’, and in addition to developing the inlet system, combustion chamber and exhaust, the optimisation of valve lift profiles to suit the engine is a common way to find performance from the top end of the engine. In a number of articles in Race Engine Technology magazine, the importance of maintaining control of the...

Timing gears

[email protected]
If we look at a production engine from a roadcar, the chances are high that the cams will be driven by a toothed belt, whether the engine is overhead camshaft or overhead valve (pushrod). If we look at an engine from a motorcycle, the camshaft drive is often internal and the drive to the camshaft from the crank is taken care of by a special type of chain. The fact that there are discrete timing elements on both of these components - as in teeth on the belt and links on the chain - means...

Seats and Guides - Materials Requirements

[email protected]

The poppet valve in an internal combustion engine is subjected to some very harsh operating conditions, with rapidly changing stress and thermal cycles. There are generally four other components that are in contact with the valve - the lash cap, stem seal, valve guide and valve seat. Some engines run without stem seals though, and lash caps were dealt with in another RET-Monitor article recently. Although they have a very similar cycle of operation, the inlet and exhaust valves are...

Variations in lash cap design

[email protected]
Lash caps (also widely known as tappet shims) are probably the most innocuous of valvetrain components. They are inherently stiff and, owing to their size, they weigh very little. There is therefore no real incentive to change their design, because any gain in stiffness or low mass will be negligible. It is far better that the design engineer spends his or her time in the pursuit of loftier goals. The humble lash cap is there simply to provide some basic adjustment in the system such that...

The effect of valve size

[email protected]

There can be little doubt that the flow bench is a useful piece of equipment. They can be found everywhere, from the workshops of those who tinker with engines for a hobby to some of the top engine manufacturers in the world. Those with large financial resources and great faith in CFD can perhaps manage well enough without a flow bench - indeed, CFD can tell us much more about port flows than a flow bench ever could. Both these tools are excellent in their own way. Anyone with a little...