So the next generation of British Touring Cars (BTCC) as far as we know at the moment will be 2.0 litre and turbocharged. Starting in 2011, the engines according to the initial press release, will need to be based on 4-cylinder production units and give something like 300 bhp with a 7000 rpm limit and 0.8 bar boost. Running through an inlet restrictor however, for the first time since 1999, camshafts will we were told, be totally unregulated. Way back then there were no restrictions on the cam lift of the 2.0 litre units and engines were delivering something like 320-330 bhp at the stimulated rev limit of 8500 rpm. Read more…
Archive for October, 2009
Lift versus Duration
Monday, October 12th, 2009PRINCIPLES OF JOURNAL BEARING DESIGN
Monday, October 12th, 2009
The purpose of a bearing is to support a load. Deflection of the journal within the bearing can adversely affect the load carrying ability of the bearing. This deflection can be greatly reduced by increasing the diameter of the journal and decreasing its length. This results in a short bearing with a consequential greater flow of oil out of the ends of the bearing. This outflow of oil transfers heat from the bearing and helps to reduce the bearing temperature.
The factor which controls the length of the bearing to the journal diameter, is known as the L/D ratio. Read more…
ADVANCED ALUMINIUM ALLOYS
Monday, October 12th, 2009
The previous article (Pin Critical) on Advanced Metals last month continued on the subject of titanium alloys. This month, we shall look in more detail at some of the more exotic aluminium alloys which are available, following on from a previous article in this vein.
Whilst in some applications, a low modulus material is very useful (fasteners for example can benefit from having a low elastic modulus), in many of the applications where aluminium is used, high stiffness would be a useful benefit to the designer. Most aluminium alloys have a modulus Read more…
