X
items
Your shopping cart is empty.
Product Qty Amount
From:
Until:

Archive

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

Friction

chris@highpowermedia.com
Friction is the enemy of horsepower. It’s a simple enough mantra, but in order to reduce it in the internal combustion engine a full understanding of the tribology at each mating surface is essential. The friction in the ring pack and cylinder bore is, as a rule, by far the greatest, but that in the valvetrain mechanism is generally next on the list, especially so as engine speed falls. For the vast majority of race engines the direct acting system (or DAMB - Direct Acting Mechanical...

Talk to turn

chris@highpowermedia.com
The most glamorous part of any engine development programme is that of establishing the wide-open throttle engine performance. Producing the maximum bmep (brake mean effective pressure) over the usable range of engine speeds, the torque curve can be manipulated to give either out-and-out top-end power or, if driveability is more your concern, a more even distribution of torque over the engine speed range. One way this engine torque (read bmep) can be manipulated is by altering the camshaft...

That other camshaft

chris@highpowermedia.com
It is perhaps easy to forget that while in most gasoline engines the function of the camshaft is solely to open and close the intake and exhaust valves, in others - particularly the more modern direct injection designs - cams are part of the fuel system. Diesel engines, of course, have always injected the fuel directly into the cylinder, and the most convenient way to do that (converting the rotary motion of the crankshaft into one of a reciprocating nature of a high-pressure pump) is to...

Peace and harmony

chris@highpowermedia.com

I suppose you could say that the valvetrain in any engine is a bit like my grown-up family. So long as everyone away from home stays in contact with the matriarch, all is well. However, as soon as that contact is lost - a late birthday card, for instance, or a promise to phone not honoured - then there are, shall we say, consequences. The same can certainly be said of the valvetrain, for when components in the system lose contact with each other the consequences can be more than simple...

Asymmetrical profiles

chris@highpowermedia.com
"What goes up must come down." I'm sure we've all heard that at some time, and a true enough statement most of the time (but not as it seems to gasoline prices at the pump). But what has this to do with cam design, I hear you ask? Well, if you substitute the words 'goes up' for 'opens' and 'come down' for 'closes' you can begin to see what I'm getting at. The fact is that, in designing a cam profile, we have to lift the valve assembly off...
RSS
124678910Last