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Re: Waste spark or other........ #883680 02/27/04 07:25 AM
Joined: Sep 2000 Posts: 9,602 KC, MO D DemonSVT_dup1 Hard-core CEG'er
DemonSVT_dup1 Hard-core CEG'er D Joined: Sep 2000 Posts: 9,602 KC, MO	Originally posted by mikey boy: is what your talking about "coil on plug?" are there any drawbacks to the coil on plug setup? That is one form of DIS and that even does away with spark plug wires. However the coil pack DIS has the same individual coil for each cylinder. They are just packed together instead of individually. It then uses wires to transfer the energy instead of direct connection. Coil-on plug DIS does deleted the need for plug wires. So from a maintenance standpoint that's a plus. 2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.

Re: Waste spark or other........ #883681 02/27/04 07:26 AM
Joined: Sep 2000 Posts: 4,693 Thousand Oaks, California, USA B Big Jim_dup1 Hard-core CEG'er
Big Jim_dup1 Hard-core CEG'er B Joined: Sep 2000 Posts: 4,693 Thousand Oaks, California, USA	Originally posted by DemonSVT: Originally posted by hetfield: ~~~ As for the actual topic. Yes waste firing is used to help control unburnt hydrocarbons. Yes it is emissions related. The only effect it has is reducing emissions and wearing out plugs faster. (Well catalyst longevity too) It has no performance implications: good or bad. This is one of the few times that I must disagree with DemonSVT. I cannot conceive that there is any measurable improvement in reducing hydrocarbons from the second firing of the plug. For one thing in many modes of operation the original combustion process is still happening. In the modes that it might not still be in combustion, for all intent and purpose, there is nothing that could be easliy ignited remaining. At most, there would only be what little area in the plug gap that would be effected. When the engineers wanted to keep the combustion going longer to help clean up emissions, they injected fresh air into the exhaust port very near the exhaust valve (air injection). No change in ignition was needed. Without additional air there will not be enough HC to start a new burn. Anyway, that is my $.02. Jim Johnson 98 SVT 03 Escape Limited

Re: Waste spark or other........ #883682 02/27/04 07:33 AM
Joined: Sep 2000 Posts: 4,693 Thousand Oaks, California, USA B Big Jim_dup1 Hard-core CEG'er
Big Jim_dup1 Hard-core CEG'er B Joined: Sep 2000 Posts: 4,693 Thousand Oaks, California, USA	Originally posted by mikey boy: Originally posted by DemonSVT: 1 coil for each cylinder. Thus eliminating the rpm factor in coil runoff. That stands out as a serious improvement. is what your talking about "coil on plug?" are there any drawbacks to the coil on plug setup? Coil on plug call for one coil for each spark plug instead of one coil for two spark plugs so it is more expensive. Coil on plug eliminates the need for plug wires and so may have an advantage. The big advantage to coil on plug is that the ignition timing can be controlled for each individual cylinder. It is a critical component for run safe strategy that can keep an engine from overheating even when there is a coolant loss. Coil over plug also eliminates the need for dual platinum spark plugs. Single platinum will wear just as long since the only tip that really must have the platinum tip is the tip that the spark jumps from. On waste fire ignition systems, half of the cylinders fire with reverse polarity, with the spark jumping from the side wire to the center electrode, just the oposite of conventional ignition systems. Jim Johnson 98 SVT 03 Escape Limited

Re: Waste spark or other........ #883683 02/27/04 08:42 AM
Joined: Mar 2002 Posts: 266 Silicon Valley, CA M mr_froge_dup1 CEG\'er
mr_froge_dup1 CEG\'er M Joined: Mar 2002 Posts: 266 Silicon Valley, CA	A FYI: AutoLite Spark Plug discussion And.....The problem that Bosch has acknowledged when using their Platinum plugs in engines with waste spark ignition systems stems from the tendency of electrode metal to get transferred depending upon the polarity (direction of current flow) of the spark. In waste spark ignition systems, 1/2 of the plugs always see reverse polarity sparks. Given the very narrow platinum center electrode of the Bosch Platinums, performance will be degraded more significantly when reverse polarity sparks will cause material to be transferred from the large ground/outer electrode onto the narrow platinum center electrode's exposed end surface. In cars with conventional (1 coil) ignition systems, every spark is of the same polarity, for which the Bosch Platinums are optimized, leaving them to deliver their designed-in advantages, which include: o reaching self-cleaning temperature faster ("than any other plug") o maintaining the spark gap and low firing voltage requirement throughout their service life. (even in my high-stress turbocharged application) - Rich LBC Performance Motorsports Group/AMSOIL '98 Cougar V6 ATX aka 'Candy Striper' Photos

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