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.
Showing posts with label CYLINDER HEAD. Show all posts
Showing posts with label CYLINDER HEAD. Show all posts
Monday, 14 February 2011
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.
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