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Bv Cylinder Volume
Swept cylinder volume for one cylinder. If your engine has 4 cylinders and a
total displacement of 2000 cm
3
, the cylinder volume for one cylinder is 2000
/ 4 = 500 cm
3
.
Bv Tdc Cylinder (firing order)
Tdc angle for each cylinder with cylinder 1 as reference. Cylinder 1 is always
zero. A cylinder that’s not in use is set to -1. This relationship is based on the
crankshaft layout and the angles between the cylinder banks if it’s a V-
engine.
Example.
An in line 4 cylinder, four stroke engine with firing order 1342.
A four stroke engine needs two engine revolutions to complete all four
strokes = 720 degrees.
Inline fours usually have symmetrical spread out firing order.
The angle between TDC. 720 / 4 = 180 degrees which is the distance to
next cylinder TDC.
Cylinder 1: Always set this one to 0
Cylinder 3: 0 + 180 = 180
Cylinder 4: 180 + 180 = 360
Cylinder 2: 360 + 180 = 540
Example of TDC relationship at an 4 cyl with firing order 1342
Bv Tdc Cylinder Offset
You need to know the angle between the reference point of the pulse wheel
(“1 lost” or “2 lost”) and TDC for cylinder 1 on the trigger wheel used for the
CKP sensor. See section 3.1.2. This value needs to be entered in Engine
Setup –> Engine Specifications –> Bv Tdc Cylinder Offset. Once you have
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