CDI ignition to add 2more spark plugs

Thread Starter

santoshqa

Joined Jan 31, 2018
13
Below is ignition coil used on a tripple spark ignition bike(Bajaj Pulsar) planning to use this coil in my project but not able to understand the how to connect with my existing coil IMG_20170110_184458.jpg on my bike but need suggestion how to connect with existing coil
 

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shortbus

Joined Sep 30, 2009
10,049
If there is no any effect to other parts of bike i will go further for tripple spark ignition to my bike, thanks
What advantage in the way the motor runs are you expecting? Where and how are you going to put the extra plugs in the cylinder head? Many motor cycle engines will see two plugs as not being an advantage, and may even cause internal damage to the engine. Due to the way the piston top and combustion chamber are shaped. Two plugs can cause "pinging" or detonation in the engine, caused by colliding flame fronts. engines using two plugs per cylinder are designed from the beginning to use them, they normally aren't an "add on" type of thing.

What part of the world are you in?
 

ian field

Joined Oct 27, 2012
6,536
What advantage in the way the motor runs are you expecting? Where and how are you going to put the extra plugs in the cylinder head? Many motor cycle engines will see two plugs as not being an advantage, and may even cause internal damage to the engine. Due to the way the piston top and combustion chamber are shaped. Two plugs can cause "pinging" or detonation in the engine, caused by colliding flame fronts. engines using two plugs per cylinder are designed from the beginning to use them, they normally aren't an "add on" type of thing.

What part of the world are you in?
Saw an anecdote about a competition trial rider, the big single had a dummy plug in the head as access for a timing gauge - same thread as a spark plug, so he fitted a wasted spark coil and a second spark plug. He claimed there was a worthwhile power increase, but I can't remember if any figures were published.
 

shortbus

Joined Sep 30, 2009
10,049
Saw an anecdote about a competition trial rider, the big single had a dummy plug in the head as access for a timing gauge - same thread as a spark plug, so he fitted a wasted spark coil and a second spark plug. He claimed there was a worthwhile power increase, but I can't remember if any figures were published.
A lot of dirt bikes had that extra plug thread hole in them, guys used to put a spark plug in them. And when out in the woods if the first plug fouled out they just switched the lead to the unused plug, to keep riding. But never heard of any one using both plugs at the same time.
 

Thread Starter

santoshqa

Joined Jan 31, 2018
13
A lot of dirt bikes had that extra plug thread hole in them, guys used to put a spark plug in them. And when out in the woods if the first plug fouled out they just switched the lead to the unused plug, to keep riding. But never heard of any one using both plugs at the same time.
Its already been tried with 2stroke bike for twin spark and it's been proved that 30 to 40% improvement in efficiency so going to try for same
 

ian field

Joined Oct 27, 2012
6,536
A lot of dirt bikes had that extra plug thread hole in them, guys used to put a spark plug in them. And when out in the woods if the first plug fouled out they just switched the lead to the unused plug, to keep riding. But never heard of any one using both plugs at the same time.
If the firing plug fouls - the spare will have fouled even worse. The flame front cools somewhat even in that short distance across the cylinder head.
 

shortbus

Joined Sep 30, 2009
10,049
If the firing plug fouls - the spare will have fouled even worse. The flame front cools somewhat even in that short distance across the cylinder head.
The guys I rode with never had a problem. I though like you do when first saw them, they get a light film of carbon on them, but it doesn't foul because it isn't hot enough to stick. The main problem with a fouled plug is the carbon bakes on to the insulator up where it meets the plug body, not on the tip where it sparks. The tip is where the unused plug gets a light coating of carbon, and once it is made as the main plug it burns right off.
 
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