At what RPM does a single coil not have enough dwell time
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dleach1407
- Posts: 468
- Joined: 2021 Mar 21, 15:17
- Location: Colorado Springs, CO
- Vehicle Information: 95 Mustang GT, CBAZA Quarterhorse
331, 190 11R heads, Edelbrock Victor 50 manifold, F303, T5, 76mm Turbo, 91 octane, Returnless dual pump 03 cobra tank, Behind bars rails, 80# siemens injectors
wbo2_030MtxL
57 F100, RZASA, 04 Crown Vic ecu and harness, 302, GT40 heads, 4r70w, 80# deka5 shorties, Holley carb style throttle body, Speedmaster high rise intake manifold
At what RPM does a single coil not have enough dwell time
I remember reading somewhere that a single coil doesn't have enough dwell time to provide strong spark above a certain rpm. At what point should COP or even wasted spark be considered.
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decipha
- Posts: 5051
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- Location: Metairie, LA
- Vehicle Information: Work Truck
'19 F-150 3.3L
Re: At what RPM does a single coil not have enough dwell time
dwell depends on the coil itself and temperature but many have taken single coils over 7k rpm.
Bigger problem you run in to is too weak of a spark at higher rpm when trying to ignite heavily boosted engines especially at rpm.
If your seeing 7k+ then its time to upgrade.
Bigger problem you run in to is too weak of a spark at higher rpm when trying to ignite heavily boosted engines especially at rpm.
If your seeing 7k+ then its time to upgrade.
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dleach1407
- Posts: 468
- Joined: 2021 Mar 21, 15:17
- Location: Colorado Springs, CO
- Vehicle Information: 95 Mustang GT, CBAZA Quarterhorse
331, 190 11R heads, Edelbrock Victor 50 manifold, F303, T5, 76mm Turbo, 91 octane, Returnless dual pump 03 cobra tank, Behind bars rails, 80# siemens injectors
wbo2_030MtxL
57 F100, RZASA, 04 Crown Vic ecu and harness, 302, GT40 heads, 4r70w, 80# deka5 shorties, Holley carb style throttle body, Speedmaster high rise intake manifold
Re: At what RPM does a single coil not have enough dwell time
Thanks, i thought it was closer to 7500, glad i asked. I'm helping a friend spec out his Holley setup and told him COP was a better option. It's a 408w with afr 225 heads with a ysi. I'm going to try and convince him to go with COP.
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red5.0fogger
- Posts: 150
- Joined: 2021 Mar 22, 15:58
- Location: Newington CT
- Vehicle Information: 1986 Mustang GT, Stock block, TFS 170 Heads , N41 cam, ported cobra intake, nitrous, T5 , 3.73s
Re: At what RPM does a single coil not have enough dwell time
Using 7000 rpm;
dizzy rpm is half that
3500 rpm x 8 = 28,000 spark events per min
/60 = 466 spark per sec
1/466 =.002
So 2 milliseconds for coil saturation. not so great, range is 2 to 5 typically from what I was researching which backs up Decipha, not that he needs it, LOL
dizzy rpm is half that
3500 rpm x 8 = 28,000 spark events per min
/60 = 466 spark per sec
1/466 =.002
So 2 milliseconds for coil saturation. not so great, range is 2 to 5 typically from what I was researching which backs up Decipha, not that he needs it, LOL