ground cable noise near spark plug wires
09-11-22, 01:47 PM
#1
ground cable noise near spark plug wires
so this isn't specific to fds but I'm upgrading cables on my fd
current upgrading the chassis to engine ground to 0 gauge
the way I was going ground have it routed ( threaded hole already predrilled on chassis near front of master cylinder to center plate on engine) it was going to be running in between my msd 8.5mm spark plug wires
not directly in contact in near them if that makes any sense?
I just want to make sure they won't be an issue with that
current upgrading the chassis to engine ground to 0 gauge
the way I was going ground have it routed ( threaded hole already predrilled on chassis near front of master cylinder to center plate on engine) it was going to be running in between my msd 8.5mm spark plug wires
not directly in contact in near them if that makes any sense?
I just want to make sure they won't be an issue with that
09-11-22, 03:28 PM
#2
No there won't. There a spark plug cables out there that have shielded strips under the insulation that run to a ground strap. If there happens to be any residual effects from them being in close proximity then it will be positive. You'll be fine
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AlexG13B (09-11-22)
09-12-22, 10:06 AM
#3
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There are three problems with ignition and you're alluding to one of them; i've been meaning to post something, but these issues are hard to quantify.
Spark Leakage. when you make more power, the combustion pressure goes up, and the energy required to fire the spark plug goes up. electricity is lazy though, it takes the easiest path to ground. at some point the energy required to fire the plug is more than it is to just go around the spark plug boot/through the wire insulation. keeping the wire away from other things, or adding insulation fixes this
the next one, is RFI, Radio Frequency Interference. can be a big problem, as it can mess with signals to the ECU.
the third one is "inductive cross fire" this is where the pulse of one ignition event can fire the plug on another cylinder. huge problem on engines where the firing order puts two cylinders physically next to each other, like a small block Chevy. half of Smokey Yunicks book is about this. on a V8 it is firing the spark plug 90 degrees early which will break it. Mazda kind of fixed this with the FD, as the solution is to have the wires for each rotor either separate or you must have them cross at 90 degrees (the older rotaries do this)
the thing is that a stock FD in good shape is fine, but the more power you make the more these things are potential problems
Spark Leakage. when you make more power, the combustion pressure goes up, and the energy required to fire the spark plug goes up. electricity is lazy though, it takes the easiest path to ground. at some point the energy required to fire the plug is more than it is to just go around the spark plug boot/through the wire insulation. keeping the wire away from other things, or adding insulation fixes this
the next one, is RFI, Radio Frequency Interference. can be a big problem, as it can mess with signals to the ECU.
the third one is "inductive cross fire" this is where the pulse of one ignition event can fire the plug on another cylinder. huge problem on engines where the firing order puts two cylinders physically next to each other, like a small block Chevy. half of Smokey Yunicks book is about this. on a V8 it is firing the spark plug 90 degrees early which will break it. Mazda kind of fixed this with the FD, as the solution is to have the wires for each rotor either separate or you must have them cross at 90 degrees (the older rotaries do this)
the thing is that a stock FD in good shape is fine, but the more power you make the more these things are potential problems
09-12-22, 11:43 AM
#4
There are three problems with ignition and you're alluding to one of them; i've been meaning to post something, but these issues are hard to quantify.
Spark Leakage. when you make more power, the combustion pressure goes up, and the energy required to fire the spark plug goes up. electricity is lazy though, it takes the easiest path to ground. at some point the energy required to fire the plug is more than it is to just go around the spark plug boot/through the wire insulation. keeping the wire away from other things, or adding insulation fixes this
the next one, is RFI, Radio Frequency Interference. can be a big problem, as it can mess with signals to the ECU.
the third one is "inductive cross fire" this is where the pulse of one ignition event can fire the plug on another cylinder. huge problem on engines where the firing order puts two cylinders physically next to each other, like a small block Chevy. half of Smokey Yunicks book is about this. on a V8 it is firing the spark plug 90 degrees early which will break it. Mazda kind of fixed this with the FD, as the solution is to have the wires for each rotor either separate or you must have them cross at 90 degrees (the older rotaries do this)
the thing is that a stock FD in good shape is fine, but the more power you make the more these things are potential problems
Spark Leakage. when you make more power, the combustion pressure goes up, and the energy required to fire the spark plug goes up. electricity is lazy though, it takes the easiest path to ground. at some point the energy required to fire the plug is more than it is to just go around the spark plug boot/through the wire insulation. keeping the wire away from other things, or adding insulation fixes this
the next one, is RFI, Radio Frequency Interference. can be a big problem, as it can mess with signals to the ECU.
the third one is "inductive cross fire" this is where the pulse of one ignition event can fire the plug on another cylinder. huge problem on engines where the firing order puts two cylinders physically next to each other, like a small block Chevy. half of Smokey Yunicks book is about this. on a V8 it is firing the spark plug 90 degrees early which will break it. Mazda kind of fixed this with the FD, as the solution is to have the wires for each rotor either separate or you must have them cross at 90 degrees (the older rotaries do this)
the thing is that a stock FD in good shape is fine, but the more power you make the more these things are potential problems
ya that was my fear
im running running 8.5mm wires wit haltech smart coils in direct fire.
im prob around 400 or so hp so not sure how much spark or energy is needed for that, should i run a "shield" around the ground wire?
insulation pretty thivk on both ground wire and ignition wires i think
09-12-22, 12:24 PM
#5
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if the spark leaks out of the wire, the spark plug isn't going to fire, so that is the big thing. the energy going to ground is fine, and its better than it frying something.
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j9fd3s (09-12-22)
09-12-22, 12:41 PM
#7
There are three problems with ignition and you're alluding to one of them; i've been meaning to post something, but these issues are hard to quantify.
Spark Leakage. when you make more power, the combustion pressure goes up, and the energy required to fire the spark plug goes up. electricity is lazy though, it takes the easiest path to ground. at some point the energy required to fire the plug is more than it is to just go around the spark plug boot/through the wire insulation. keeping the wire away from other things, or adding insulation fixes this
the next one, is RFI, Radio Frequency Interference. can be a big problem, as it can mess with signals to the ECU.
Spark Leakage. when you make more power, the combustion pressure goes up, and the energy required to fire the spark plug goes up. electricity is lazy though, it takes the easiest path to ground. at some point the energy required to fire the plug is more than it is to just go around the spark plug boot/through the wire insulation. keeping the wire away from other things, or adding insulation fixes this
the next one, is RFI, Radio Frequency Interference. can be a big problem, as it can mess with signals to the ECU.
the third one is "inductive cross fire" this is where the pulse of one ignition event can fire the plug on another cylinder. huge problem on engines where the firing order puts two cylinders physically next to each other, like a small block Chevy. half of Smokey Yunicks book is about this. on a V8 it is firing the spark plug 90 degrees early which will break it. Mazda kind of fixed this with the FD, as the solution is to have the wires for each rotor either separate or you must have them cross at 90 degrees (the older rotaries do this)
the thing is that a stock FD in good shape is fine, but the more power you make the more these things are potential problems
the thing is that a stock FD in good shape is fine, but the more power you make the more these things are potential problems
ya that was my fear
im running running 8.5mm wires wit haltech smart coils in direct fire.
im prob around 400 or so hp so not sure how much spark or energy is needed for that, should i run a "shield" around the ground wire?
insulation pretty thivk on both ground wire and ignition wires i think
im running running 8.5mm wires wit haltech smart coils in direct fire.
im prob around 400 or so hp so not sure how much spark or energy is needed for that, should i run a "shield" around the ground wire?
insulation pretty thivk on both ground wire and ignition wires i think
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j9fd3s (09-12-22)
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