To increase power or engine power standard motor is commonly called tune-up, needs to be put changes on a few things:
1 Increase / raise the compression ratio.
2 Fixing IN and EX ported so that entry of fuel to be smooth and good.
3 Changing the duration, lifts Noken.
4 Change the ignition (if the race is allowed).
5 Changing the ratio of the Close Ratio.
6 Setting the carburetor.
COMPRESSIONIncrease the compression ratio (Compretion Ratio = CR) is a way of
beginning to be taken by the mechanics to increase engine power.However, to increase the compression ratio to consider several
factors, among others, fuel used and the quality pistons are used.How to increase COMPRESSION:1. Replace the piston with model racing.2. Closer deck clearance.3. Turning Head.4. Weld Head.5. Turning Block and Piston.HOW TO REDUCE COMPRESSION:1. Merimer dome on the head.2. Deepen coakan valve on the piston.3. Turning the piston.ADVANTAGES OF USING COMPRESSION HIGH:1. Power engine increases.2. Final gear becomes heavy.3. Power engine feels from the round bottom to top.LOSS USING COMPRESSION HIGH:1. The machine becomes hot quickly.2. Engine break into a big and rough.3. If the calculation is not precise compression, frequent detonation
To determine / calculate the compression ratio (CR) of one machine, we
need to know the volume of the cylinder that will be done.EXAMPLE IN MACHINE JUPITER ZO / S 100 or D Bore: 52 mm = 5.2 Cm Stroke 54 mm = 5.4 cm= 0.785 x 5.22 x 5.42= 114.62 cc; 115 ccEXAMPLE OF JUPITER Z O / S 100The volume of the combustion chamber through the spark plug is measured with burette is 14.55 cSo the volume of the combustion chamber 14.55 cc - 0.7 cc = 13.85 (0.7 cc volume space is Busi)How to determine how the content cc combustion chamber we should wear the compression ratio that we have set.For example, we want the compression ratio of 1: 14 how the volume of space fuel?Means that if we want a compression ratio of 1: 14, the contents of the combustion chamber must 8,84cc. PortingThe purpose of the change is the porting effort to enhance or improve
volumetric efficiency by optimizing the flow of gas into the combustion
chamber.There are three factors that determine the amount of power on a machine:1. Engine efficiency is how much encouragement on the piston which is generated by the rotation force fly wheel.2. Efficiency of thermal (heat) that is how much fuel to be burnt /
heated in the cylinder to push the piston down to the TMB efficiently.3. The volumetric efficiency is to make the channel / right size for optimal gas pump.In a modification, Head try not got any obstacles, such as holes
intake manifold holes above should also be the same as the joint /
rubber manifold, try the merimer so that no space is angled.Among
the components of the motor are the most important to increase the
speed of the engine is a modified camshaft / cam / Noken. Noken controls the open / close valve is required to regulate the fuel
passes through the valve in the valve ex and throw passes in harmony.
HOW Noken AS FOLLOWS:1. If point A touching the trigger, the valve began to rise and will be full after a protrusion (point B).2. After passing the peak, the valve will fall back and closed the meeting after point C.3. From A later rose to C and then back to B is called duration Noken.4. Highest Lift determine bulge Max.5. This form of surface protrusions determine the acceleration profile
closure and opening the valve by the shape of the surface of the bulge
profile.LIFT MAXHow to determine Max Lift motor racing:In theory for standard motor, Lift Max is 23% of the diameter of the valve. Then for the motor racing circuit is not very long, Max Lift approximately 29% - 31% of the diameter of the valve. To race with long circuit, Max Lift can be made up to 35% of the diameter of the valve.DURATIONHow to calculate the duration of several ways:1. Duration is calculated after the 1.27 mm valve lift on the valve setting 0 (zerro).2. Duration is calculated at the time the valve starts to open the valve of 0.10 mm.To facilitate the making, we will use that to two.Before we wanted to determine the length of numbers, we must first know how LC (lobe center) on Noken as we will modify.To determine LC, we have to put Noken on a machine with a protractor and measure the crankshaft mounted on the left / magnet.For example: LC TO JUPITER Z: 103We want a duration of 310 degrees. How many degrees in the open and how many degrees in the close?Calculation For Finding in close:310 - 180-52 = 78MEANS FOR LC 103 IF WE WANT duration DURATION 301 FIGURES ARE: IN OPEN BEFORE 52 78 AFTER THE CLOSE IN TMA TMBFor the duration of motor racing is ideally 29-33.To lift max duration of motor racing is ideally:7.5 mm - 8.3 mmThe advantage of using a high lift and duration of: - Power engine to be very large - very nice machine on lap topThe disadvantage of using a high lift and duration of: - On lap down
is not good - Per valve becomes not durable - floating valve / float
valve when the pear is not strong - Holes the valve on the piston must
be inHOW hone CAM- The Base Circle grinded approximately 18 to meet the desired lift- This was followed by grinding the ram to determine the duration- Hone the flank to determine lift O / L and formed profiles- Try to grind a camp with a flat and smooth to keep the rocker arm remain durable and reduce floating.IGNITION / IGNITIONParts on the machine is used to burn a mixture of fuel and air in the compression by the piston, before the piston reaches TDC.A source of electric current to generate sparks can come from a spool or directly battery.The power source is generated directly from the bobbin is often called
AC ignition, and directly from the battery often called ignition DC.Ignition ACThe advantage of using the air conditioning system:- The electrical system directly according to engine speed.- No need to use batteryThe disadvantage of using the air conditioning system:- Turn the engine slightly reduced, because the existing magnetic forceIgnition DCThe advantages of using the system DC / Total Lost:- No need to use magnets- The weight of the rotor can be made according to our wishes (can be very mild)The disadvantage of using the system DC / Total Lost:- Must frequent recharging (recharging) battery (batteries)- Risk of battery overdrawnStandard ignition timing differences and are often used for racing: Ignition for standard motor • At low RPM (1000-3000RPM): sparks at 8-15 before TDC • In the middle of the high RPM(4000 upwards): sparks at 25-30 before TDC• Fire ignition plugs are not greater than racingIgnition for motor racing• At low RPM (1000-3000 RPM): sparks on 20-30before TDC• In the middle to high RPM (4,000 and above): sparks at 35- 42 before TDC• Fire large plugsMiscellaneous types of CDI1. single foldercdi which comprises only the first folder / Swingexample: cdi congenital motor, dual band brt cdi2. The multi mapcdi which consists of more than 1map / curve that we can choose its own with a few clicks.example: adjustable Rextor cdi, smart brt cdi click3. The programmable cdicdi adjustable curve / graph ignition according to our wishes, adapted to the character of the engine is needed.example: Rextor programmable, cdi Vortec, brt cdi remmote.
