Calculate Compression Ratio Method Method Machines Through Buret

The compression ratio is no less important than the ferret racing racing. But, not all mechanics can calculate or know how to find the compression ratio. Well, for mechanical or Tunner who do not understand how to calculate the compression ratio is, let us learn together wrote. The trick was not difficult.
There are two ways you can do. Both also use the burette method. Yes, use a glass tube that has a measuring line and plug the tap at the bottom for dripping fluids. Fluid used, can of gasoline and oil mixture so as not quickly evaporate.

WHEN TMA
The first step, performed when the piston is in a position TDC (Top Dead Point). First, open the cylinder heads used in the race. After making sure the piston is at the top, seal the gap piston with linner use fat or grease. Goal, so that the liquid is not transparent or burette flows into the crankcase. Thus, the liquid remains in the combustion chamber. Not left behind, also part of the valve seal wear grease.
If it is, replace the cylinder head as well as ready-made machines. Now the stream or drops of fluid that is in the derat burette through the spark plug hole in the cylinder head.
Now, count how many cc of fluid volume in use to fill in the combustion chamber. After that, it also reduced the volume of fluid in the spark plug threads. Volume threaded spark plug, depending on the type of spark plug. threaded spark plug short, usually has a volume of about 0.6 cc. But if long derat plugs, 0.8 cc.
If so, the results are also added to the capacity of the machine. If the bore up, would have to recalculate the volume of the cylinder now. After that, the result is again divided by the volume of fluid again and then the obtained results. Let easy, we make the formula.
A - B + C
_________ = D
B
A: the volume of fluid in use
B: volume of threaded plugs
C: volume of a cylinder
D: compression ratio
For example, note A = 15 cc. B = 0.6 cc.
C = 150 cc. With the above formula.
15 to 0.6 + 150
____________ = 11.41
0.6
Thus, the compression ratio of 11.4: 1
WHEN TMB
In addition through the piston position in TDP (Top Dead Point), measurements can also be performed when the piston is in the position of BDP (Bottom Dead Point). Interestingly, it turns out that the results obtained could be slightly different.
Especially in terms of the resulting compression ratio. Typically, measurements in the BDP will be slightly lower than the results in the TDP. This can occur because of differences in the position of the piston.
The difference occurs because the usual position of the piston and the handlebars a little bit skewed. The difference may be only about 0.1 or 0.2. For example in TDP 14.3: 1, then the BDP 14.2: 1 Although only 0.1 difference, but significant.