|Spark plugs poser
I drive a 1996 Honda Civic SO-4 manual non V-tec. The standard spark plugs are NGK BCPR5E-11. I changed to NGK BKR5E-GP and the fuel
consumption suffers. Why is this so?
Previously, my Wira 1.6XIi did not have this
problem, and the Daihatsu Ascent 1.6, Perodua
Kelisa and Kenari are OK with that plug. Does
the Honda Civic have a special-design combustion chamber? What is the meaning of the
alphabets beside the number of the spark plug?
Two-stroke motorcycles and some super bikes
are using aluminium block, whereas some use
only cast iron block. My Honda and the other B-Series engines are aluminium block. What are
the pros and cons of aluminium and cast iron
The BCPR5E-11 is interpreted as:
B - 18 mm thread diameter
C - 5/8" hex socket size
P - Projected insulator type
R - Resistor type
5 - Heat range (2 is hot, 10 is cold)
E -19 mm thread reach
11 -1.1 mm plug gap
The difference between the BCPR5E and the BKR5E
is shown by the K letter which indicates that it has a
projected tip and that may be the reason for the drop
in fuel consumption. The projected tip may be moving the igniting point of the air-fuel mixture such that
you are not getting complete combustion and a loss
in power, and this is affecting fuel consumption. This
is the only explanation I can give assuming everything else is the same.
Many years ago before technology improved for
the casting of thin-walled aluminium castings, it was
normal to use cast iron blocks because the technology was there and cast iron
was cheaper. However, today you will notice that except for heavy duty diesels, almost all engines are cast in aluminium.