mapping
10-12-2008 | 10:43 AM
#42
The theory it "Blows Out" is a little silly, i guess it was a term made to describe it easily but its certainly nothing to do with gale force winds. lol
The actual issue is that the more cylinder pressure we run, the more voltage is required at the spark plug center electrode in order to jump the gap in the hostile environment that is a combustion chamber. So its not actually *Boost* related as such, its actually more power related which is why it tends to happen at peak torque but because more power comes with more boost and bigger turbos you can easily see and understand why the mistake is made by many people.
The actual issue is that the more cylinder pressure we run, the more voltage is required at the spark plug center electrode in order to jump the gap in the hostile environment that is a combustion chamber. So its not actually *Boost* related as such, its actually more power related which is why it tends to happen at peak torque but because more power comes with more boost and bigger turbos you can easily see and understand why the mistake is made by many people.
10-12-2008 | 07:51 PM
#44
Too many posts.. I need a life!!
Joined: May 2004
Posts: 925
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From: in the garage fixing yet another oil leak
The theory it "Blows Out" is a little silly, i guess it was a term made to describe it easily but its certainly nothing to do with gale force winds. lol
The actual issue is that the more cylinder pressure we run, the more voltage is required at the spark plug center electrode in order to jump the gap in the hostile environment that is a combustion chamber. So its not actually *Boost* related as such, its actually more power related which is why it tends to happen at peak torque but because more power comes with more boost and bigger turbos you can easily see and understand why the mistake is made by many people.
The actual issue is that the more cylinder pressure we run, the more voltage is required at the spark plug center electrode in order to jump the gap in the hostile environment that is a combustion chamber. So its not actually *Boost* related as such, its actually more power related which is why it tends to happen at peak torque but because more power comes with more boost and bigger turbos you can easily see and understand why the mistake is made by many people.
considering that in the std set up where the rotor arm gap is effectively 'in series' with the plug gap, is similar to the situation in wasted spark where the two plug gaps are in series (albeit one has a much lower 'resistance' given the lack of combustion pressure), why is wasted spark inherently better?
is this simply down to the greater potential dwell available to charge the coils and thus produce a higher voltage?
if so, then presumably your comment earlier about the coil on plug option is based on this time being longer again with greater potential! to address this issue?
if so, then does coil on plug offer any benfits over wasted?
sorry for the complicated question
10-12-2008 | 09:16 PM
#45
Advanced PassionFord User
Joined: Sep 2007
Posts: 1,896
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From: Staffordshire
COP allows an even higher dwell time than wasted spark because each coil fires once every 2 turns of the crankshaft as opposed to wasted spark which will fire once every turn of the crankshaft and a coil which will fire twice every turn of the crankshaft....
Think I've got that right, but may have put it across wrong
Think I've got that right, but may have put it across wrong
10-12-2008 | 10:20 PM
#46
PassionFords Creator
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From: Blackpool, UK Destination: Rev limiter
COP allows an even higher dwell time than wasted spark because each coil fires once every 2 turns of the crankshaft as opposed to wasted spark which will fire once every turn of the crankshaft and a coil which will fire twice every turn of the crankshaft....
Think I've got that right, but may have put it across wrong
Think I've got that right, but may have put it across wrong
11-12-2008 | 10:15 AM
#47
Too many posts.. I need a life!!
Joined: May 2004
Posts: 925
Likes: 0
From: in the garage fixing yet another oil leak
but if wasted spark is adequate, what benefits does COP bring? Also, why is a bigger spark gap actually better than a small one?
for sure size matters in most walks of life but is 0.7mm or even 1mm better than (say) 0.5mm considering that 'a spark is a spark'?
for sure size matters in most walks of life but is 0.7mm or even 1mm better than (say) 0.5mm considering that 'a spark is a spark'?
11-12-2008 | 06:11 PM
#49
The more spark there is, the better the contact area with the mixture.
The more contact area, the more chance there is if hitting a fuel/oxygen mix sooner.
Dont forget, the mixture in the chamber isnt completely mixed and is moving around.
I.E. If the spark hits pure fuel or pure oxygen, it isnt going to ignite.
The more contact area, the more chance there is if hitting a fuel/oxygen mix sooner.
Dont forget, the mixture in the chamber isnt completely mixed and is moving around.
I.E. If the spark hits pure fuel or pure oxygen, it isnt going to ignite.
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