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Thread: Why 2 plugs per cylinder? Reply to Thread
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  Topic Review (Newest First)
06-01-2011 01:38 AM
J.D.
Quote:
Originally Posted by Knifemaker View Post
The double plugs per jug is not really for power per sae, but to insure a complete combustion.... Likely to pass EPA emmissions.


Spark plug placement, head shape as well as the angle of the valves can all have an effect on how the mixture burns....as well as how much power the motor puts out.

I saw a film on MV Augusta's factory, and one of the engine designers showed how just changing the angle the intake valves 1.2 degrees added almost 2 hp.

KM
Pull just one plug wire off one cylinder, and you'll notice the power loss; pull one off each cylinder, and you'll _really_ notice it...
05-31-2011 10:13 AM
centurynick
Quote:
Originally Posted by pappa View Post
Both plugs fire at the same time. With two plugs the mixture burns faster. If you want to burn down your house, it is faster if you start the fire in multiple corners.
i
05-31-2011 04:16 AM
pappa Both plugs fire at the same time. With two plugs the mixture burns faster. If you want to burn down your house, it is faster if you start the fire in multiple corners.
05-30-2011 11:42 PM
bama750 unless one is set to fire at tdc and the other just after
05-30-2011 11:39 PM
E-Town
Quote:
Originally Posted by BRET H View Post
What do think was the reason for the design of two plugs per cylinder? More Power.......or to burn better for emissions? Also do our coils only fire on power stroke or do they also fire on the exhaust stroke too.......Like all distributorless car ignitions do?
Without a cam position sensor it has to be a wasted spark, the ignition only knows where TDC is, not which stroke it's on.
Oh, and not all distributorless ignition systems fire on the exhaust stroke, most coil on plug systems do not.
05-30-2011 05:10 PM
Knifemaker The double plugs per jug is not really for power per sae, but to insure a complete combustion.... Likely to pass EPA emmissions.


Spark plug placement, head shape as well as the angle of the valves can all have an effect on how the mixture burns....as well as how much power the motor puts out.

I saw a film on MV Augusta's factory, and one of the engine designers showed how just changing the angle the intake valves 1.2 degrees added almost 2 hp.

KM
05-30-2011 04:08 PM
VoIPDoc
Quote:
Originally Posted by BRET H View Post
What do think was the reason for the design of two plugs per cylinder? More Power.......or to burn better for emissions? Also do our coils only fire on power stroke or do they also fire on the exhaust stroke too.......Like all distributorless car ignitions do?
Manual says Suck Squeeze Bang Blow...guess that means traditional 4-Stroke
05-30-2011 02:52 PM
BRET H
Why 2 plugs per cylinder?

What do think was the reason for the design of two plugs per cylinder? More Power.......or to burn better for emissions? Also do our coils only fire on power stroke or do they also fire on the exhaust stroke too.......Like all distributorless car ignitions do?

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