Indexing the Plugs....
06-01-2007, 06:38 AM
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Indexing the Plugs....
Well let me take a minute hear and get my Flame retardant suit on..........I understand the concept of it on piston engines as it was something I did on my prelude but can it be applied on our engines? and if yes, how? like which direction would I face plugs? Any benefits to be had?
06-01-2007, 06:53 AM
#2
He's as bad as Can
I had to look up Indexing Plugs to get your answer. Since our engines do not have valves indexing does not apply.
(Taken form HERE )
Generally speaking, the idea of indexing is to position the spark plug so that its gap is facing the center of the cylinder, angled slightly toward the exhaust valve—the most common arrangement. (Some engines work better with other gap locations.) This is important because, as the piston approaches TDC, the air/fuel charge is being compressed. The charge or "mixture" is being forced toward the area of the spark plug—and normally, the exhaust valve. The true speed of this force inside the combustion chamber is extremely fast. Some experts speculate that it surpasses supersonic speeds.
(Taken form HERE )
Generally speaking, the idea of indexing is to position the spark plug so that its gap is facing the center of the cylinder, angled slightly toward the exhaust valve—the most common arrangement. (Some engines work better with other gap locations.) This is important because, as the piston approaches TDC, the air/fuel charge is being compressed. The charge or "mixture" is being forced toward the area of the spark plug—and normally, the exhaust valve. The true speed of this force inside the combustion chamber is extremely fast. Some experts speculate that it surpasses supersonic speeds.
Last edited by expo1; 06-01-2007 at 06:56 AM.
06-01-2007, 07:39 AM
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http://www.advanceautoparts.com/engl...20001001sp.asp
So positioning the plugs in our engines in this manner wouldn't apply?
Because of this, the spark generated from the plug should be in a "position" to create the best possible flame front. Looking at a typical side-gap spark plug, you'll note that the electrode can actually block the flame process. On the other hand, if the electrode gap faces the on-rushing air/fuel charge, it stands a much better chance of igniting a flame front.
06-01-2007, 07:56 AM
#4
He's as bad as Can
Since there aren't any cylinders in our engines there isn't any way to 'center' the plug. If you look up the rotary engine on howstuffworks.com and see how different the combustion process is, it will make more sense.
06-01-2007, 06:19 PM
#5
The Professor
the stock plugs are finewire and pratically flat, not the normal large bar type found in piston engines.
N/A indexing wouldnt help any. Under high boost there may be some benefit. But who knows.
N/A indexing wouldnt help any. Under high boost there may be some benefit. But who knows.
06-10-2007, 08:33 AM
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why did they weld that little top piece on the plug. sorry just ranting cause I don't understand how it would make much difference and I know the plugs for the rx7's didn't ahve them.
06-10-2007, 10:54 AM
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I'd like to see someone try laser ignition modules (http://weekendpundit.blogmosis.com/lastweekend/026438.html) on the rotary to see if they can improve control over timing, combustion, flame propagation and completeness of the burn. That might be nice: No more fouled or burned plugs, no high-voltage problems like bad coils and break-down of HV wiring.
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