As induction kits are probably one of the most popular modifications for car tuning projects we thought we should add a introductory article to explain what they are, what they do and the theory behind them.
An induction kit is quite simply an air filter. Most cars have air filters mounted in an air box.
Thursday 24 February 2011
SpeedFactory has created the fastest Dodge Charger in the world!
The American tuners at SpeedFactory have developed a modified version of the Dodge Charger 426 Hemi that can cover the quarter-mile (402 m) in 9.453 seconds. This is the fastest model built on a Chrysler LX/LC platform in the world. This platform is used by the Dodge Charger Magnum and Challenger but also by the Chrysler 300C.
Porting and Cylinder Scavenging part.1
TODAY, when we take a look down the cylinder of a two-stroke engine, we find
its walls literally filled with ports to handle the induction, transfer and exhaust phases
of gas flow through the engine.
its walls literally filled with ports to handle the induction, transfer and exhaust phases
of gas flow through the engine.
Monday 14 February 2011
The Cylinder Head part.4 (Compression Ratio)
As the Japanese motorcycling industry has been working with expansion chambers
as long as most, I am sure they are aware of the fact that the return wave actually forces As this bike is designed to run on 90-95 octane fuel the compression can safely be
bumped up to 13.7:1 for competition use on 100 octane racing fuel.
After all this confusion over all sorts of compression ratios you are probably
bewildered and wondering what compression ratio your motor will be safe on.
as long as most, I am sure they are aware of the fact that the return wave actually forces As this bike is designed to run on 90-95 octane fuel the compression can safely be
bumped up to 13.7:1 for competition use on 100 octane racing fuel.
After all this confusion over all sorts of compression ratios you are probably
bewildered and wondering what compression ratio your motor will be safe on.
Sunday 13 February 2011
The Cylinder Head part.3 (compresion)
Heat is the enemy of two-stroke engines and stretching the compression ratio to
give a 10% power increase will possibly result in a 3% power rise at the most; the rest
will be lost in heat energy and pumping losses. However, at lower engine speeds the
cylinder will not be completely filled with fuel/air mixture and the power may jump by
5-6% because there is not such a heat loss.
give a 10% power increase will possibly result in a 3% power rise at the most; the rest
will be lost in heat energy and pumping losses. However, at lower engine speeds the
cylinder will not be completely filled with fuel/air mixture and the power may jump by
5-6% because there is not such a heat loss.
Thursday 10 February 2011
The Cylinder Head part.2 (squish clearance)
If your machine is only for play, and that's the use to which many motocross bikes
are put, a wide squish clearance will not matter. You will not get peak power, but you
will possibly never know the difference. And you will probably never ride hard enough
to experience detonation.
However, if you want top power and no risk of detonation, the squish clearance
must be closed up. A squish band that isn't working is worse than no squish band at all
as it wastes part of your fuel/air charge. Wasted fuel charge spells less horsepower.
are put, a wide squish clearance will not matter. You will not get peak power, but you
will possibly never know the difference. And you will probably never ride hard enough
to experience detonation.
However, if you want top power and no risk of detonation, the squish clearance
must be closed up. A squish band that isn't working is worse than no squish band at all
as it wastes part of your fuel/air charge. Wasted fuel charge spells less horsepower.
The Cylinder Head part.1 (squish chamber)
THE TWO-STROKE cylinder head certainly doesn't look very exciting but its
design has a large bearing on how well your engine will run. Manufacturers use various
external shapes and cooling fin patterns but the main requirement here is that the
cooling area be large enough to adequately cool the engine. Some people feel that the
head must have radial fins to be any good, but I disagree. Conventional finning is
entirely adequate. It is the surface area which counts, not the fin pattern.
design has a large bearing on how well your engine will run. Manufacturers use various
external shapes and cooling fin patterns but the main requirement here is that the
cooling area be large enough to adequately cool the engine. Some people feel that the
head must have radial fins to be any good, but I disagree. Conventional finning is
entirely adequate. It is the surface area which counts, not the fin pattern.
TWO STROKE TUNING
MECHANICALLY, the two-stroke engine is very simple, and unfortunately on
too many occasions this apparent simplicity has fooled would-be tuners into believing
that this type of power unit is easy to modify. Just a few hours work with a file in the
exhaust and inlet ports can change the entire character of the engine for the better, but
if you go just 0.5mm too far, you could end up with a device slower than its stock
counterpart.
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