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Underbody braces, turbos and more!

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PostPosted: Fri Dec 07, 2007 5:29 pm 
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Sad but True...

Joined: Fri Jul 27, 2007 8:20 pm
Posts: 2973
Location: Saskatchewan
Ok heres the scenerio I came up with:
1) DOHC head
2) 2 distributors
3) 2 ignition coilds
4) 2 slightly different timing settings.
5) Custom spark plug wires

Bave one set at a base 4-5* and have the other one your primary ecu controlled spark?

How long is the spark "sparking" for in terms of degrees though? This answer could throw this dumb idea right out the window and making it useless


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PostPosted: Sat Dec 08, 2007 12:01 am 
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Joined: Tue Jul 20, 2004 7:17 pm
Posts: 3566
Location: Georgetown, Guyana
First - what are you hoping to achieve?

Second - you'd probably not get much of a spark to the plug itself - since you'd also be sending the high voltage back through the second distributor and the second coil to ground - separate spark plugs would work better.

There have been engines with ignition systems conceptually similar to this, for example - aircraft engines which use dual plugs with redundant magnetos for reliability, some motor cycles also use dual plugs, and I believe Datsun/Nissan also briefly offered a twin plug motor - a 4 cylinder engine with 8 spark plugs - which I think was done for economy, to better ignite a weak mixture.


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PostPosted: Sat Dec 08, 2007 6:45 am 
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Joined: Mon Dec 01, 2003 12:47 pm
Posts: 11669
Location: columbus, ohio
dual plugs are used many times when piston/ head geometries combine to block the flame front. there are occasions where pop up pistons or wedge shaped piston domes cause problems with flame front propagation and it's corrected with the addition of a second spark plug.

i, too, am puzzled by what you hope to accomplish, especially by staggering the timing for a delayed secondary spark event.

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PostPosted: Sat Dec 08, 2007 1:53 pm 
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Sad but True...

Joined: Fri Jul 27, 2007 8:20 pm
Posts: 2973
Location: Saskatchewan
well like I said, its a silly idea, but yes the secondary spark would be delayed. lets assume we have some 1 way current limiter too, this is all hypothetical ofcourse. but say you can trigger your initial spark just like normal, but then you also have a secondary spark delayed and fires just before TDC... it probably wont do anything at all actually, I should not be allowed to post drunken idea online heh.

but its already been ignited, not sure what I was thinking was going to happen. more complete burn? lol who knows


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