FiA F1 Technical Regulations wrote:U5.9U Electrical systems :
U5.9.1U Ignition is only permitted by means of a single ignition coil and single spark plug per cylinder. The use of plasma, laser or other high frequency ignition techniques is forbidden.
U5.9.2U Only conventional spark plugs that function by high tension electrical discharge across an exposed gap are permitted.
Spark plugs are not subject to the materials restrictions described in Articles U5.14 and 5.15U.
Germanengineering wrote:I just read that the new Dodge Hemi uses a dual spark ignition to reduce emissions.
DaveKillens wrote:In aviation, dual spark plugs per cylinder is common practice. In fact, aircraft reciprocating engines carry two completely independent ignition sources, obviously for reduncancy and safety.
A second use for two spark plugs is to compensate for poor fuel burn, or an irregular flame front.
Additionally, the physical geometry of the combustion chamber, the location of the valves, and requirements for coolant passages may dictate spark plug placement.
The two sparks on the 8V Alfa Twin Spark engines fire at the same time per cylinder and this makes the fuel mixture burn faster than single plug ignition because it is fired from 2 different places simultaneously. So less ignition advance could be used and also leaner mixtures could be burned. The 8V engine also has 8 identical spark plugs. They are symmetrically located at opposite sides of the combustion chamber. There is no room for a center positioned spark plug because the 2L version of the 8V engine use a 44mm intake valve and the two spark plug holes are on the sides of the 2 valves.
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