Which one of these coils would you choose for racing

[redrx7]

Hi im im trying to builed an Ignition system for a drag car that is also street driven which one of these coils would be the better performer. Give resone for your answer.

Brand: Jacobs Electronics
Product Line: Jacobs Ultra-Lyzer Coil Kit
Part Type: Ignition Coils
Coil Wire Attachment: Male/HEI
Coil Style: E-core
Primary Resistance: 0.500 ohms
Coil Internal Construction: Epoxy
Maximum Voltage: 60,000 V
Turns Ratio: 85:1
Secondary Resistance: 2.6K ohms
Inductance: 5.2 mH
Peak Current: 250 mA
Spark Duration: 120 uS
Mounting Bracket Included: Yes
Coil Wire Included: No
Ballast Resistor Included: No
Coil Color: Blue
Coil Shape: Square
Height (in): 3.639 in.
Length (in): 4.289 in.
Width (in): 4.265 in.
Quantity: Sold individually.
Notes: Includes replacement coil wire boot.
Ignition Coil, Ultra Coil, E-Core, Square, Epoxy, 65,000 V, Blue, Each

Brand: MSD Ignition
Product Line: MSD Blaster HVC-2 Ignition Coils
Part Type: Ignition Coils
Coil Wire Attachment: Male/HEI
Coil Style: U-core
Primary Resistance: 0.160 ohms
Coil Internal Construction: Epoxy
Maximum Voltage: 44,000 V
Turns Ratio: 100:1
Secondary Resistance: 630 ohms
Inductance: 3.5 mH
Peak Current: 450 mA
Spark Duration: 450 uS
Mounting Bracket Included: No
Coil Wire Included: No
Ballast Resistor Included: No
Coil Color: Blue
Coil Shape: Square
Height (in): 3.000 in.
Length (in): 6.000 in.
Width (in): 6.000 in.
Quantity: Sold individually.
Notes: For use with MSD 6 Series ignition controls.
Ignition Coil, Blaster HVC-2, E-Core, Square, Epoxy, Blue, 44,000 V, Each

Brand: Mallory
Product Line: Mallory Promaster Classic Series Coils
Part Type: Ignition Coils
Coil Wire Attachment: Male/HEI
Primary Resistance: 0.500 ohms
Coil Internal Construction: Epoxy
Maximum Voltage: 67,000 V
Turns Ratio: 129:1
Secondary Resistance: 12.5K ohms
Inductance: 4.8 mH
Peak Current: 120 mA
Spark Duration: 450 uS
Mounting Bracket Included: Yes
Coil Wire Included: No
Ballast Resistor Included: No
Coil Color: Black
Coil Shape: Square
Quantity: Sold individually.
Notes: This coil is for engines that operate between 4,000 and 10,000 rpm.
Ignition Coil, Promaster Classic Race, Square, Epoxy, Black, 67,000 V, Each

 

[bradrs]

I would pick the one that was best suited to the type of ignition on the car, dwell control scheme(if applicable), RPM range, expected cylinder pressure, and mounting location. Even with all that information, in the end, I prefer to measure coil performance on vehicle, and see how it runs in real life before making any real decisions on it. Sometimes the problems with a cars ignition is inadequate voltage, sometimes its a spark duration problem, and that isn't always easy to predict.

None of those data points needed were listed here, so it'd be difficult to specify one coil as more likely to be properly suited for your application.

2 of your coils are 0.5 ohm primary, one is 0.16 ohm. They may not have the same intended application. There is a difference between coils designed for CDI, and coils designed for inductive(12V) ignitions.

 

[redrx7]

i will be useing 2 of theses ingnition amps to power the coils, the car will be used on the street but will be in Intended for drag racing on the track. i hope this helps.

Brand: Jacobs Electronics
Product Line: Jacobs FC 4000 Digital Fire Control Ignitions
Part Type: Ignition Boxes
Ignition Box Output: Capacitive discharge
Circuitry: Digital
Rev Limiter: Yes
Timing Retard: None
Data Acquisition: No
CD Voltage Output to Coil: 550 V
Current Draw: 12 amps at 10,000 rpm
Spark Output (millijoules): 302 Millijoules
Minimum Operating Voltage: 7.5 V
Maximum Operating Voltage: 16 V
Length (in): 8.500 in.
Height (in): 2.500 in.
Width (in): 4.500 in.
Ignition Box Color: Silver
Coil Included: No
CARB EO Number: D-19-34
Warranty: One year warranty
Quantity: Sold individually.
Notes: Prolonged street use will cause the ignition box to overheat. Recommended mainly for race use with minimal street usage.

Ignition Box, FC 4000 Fire Control, Analog, Capacitive Discharge, Universal, Magnetic Pickup Applications,Each

 

[redrx7]

maybe i should point out that it is a rotary engine that will be runing at 28psi boost pressure. The fuel will be methanol at high boost and will be controlled by a separate additional injector controller.

 

[bradrs]

Your choice of CDI is a rather high output. For this application, I'd say that the biggest risk you will encounter is the likelihood of the CDI getting too warm. Not at the drag strip either. A few minutes at idle followed by a few seconds of 10K rpm won't be long enough to overheat it. But if you drive it at highway cruise speed, I could see the CDI itself getting too warm. And possibly the coil primaries as well. What coils does Jacobs recommend with their unit?

The MSD coil MIGHT fare better due to its primary resistance. I think of the ones listed, it is closer to ideal for a CDI coil.

As for making power, I'd suspect any of those coils should work OK with a CDI driving them.

 

[redrx7]

I will talk to Jacobs just check with them but the unit Will vary its out put with revs, so at low revs it produces less power and more as the revs build up, I think this will help it not warm up as much.
Thankyou very much for your help.

Erdin

 

[lugnuts67]

It's not just the coil either - you may want to consider two sets of plugs - one for street and one for strip - because of the heat range and rpm that the engine will experience.

 

[redrx7]

Iv been using Greddy NGK racing 11 raiting plugs so far, which have been working fine. i have decided to use the msd coils with the FC4000 ignition amp, as this is what others have also been using with some success so il give it a go and play around with different coils to find out which one works best.

 

[1BAD801]

I run a Mallory set-up in my 434 sbc Vette.
I have tried the others and had problems with them.
Crane fire wire plug wires are the best to use @25 OHM ft
Yes I took my car to the strip, 10.89 @135mph and drive it every day and hit the cruise's with not heat problems.

 

[redrx7]

Thats a great time, the best i hit was 11.9 at 125, runing 465 at the hub at the time. What sort of power are you putting out?

= (sample only)

 

[1BAD801]

I use Mallory #29625 and would recommend the same.
I run a full roller motor with a .585 cam for the street.
With a .690 lift cam it dynoed @ 679 hp
My toys I built or help build & race,

http://community.webshots.com/user/1bad80100

 

[redrx7]

That’s a really nice car, you don’t see them hear in the England to often, must sound like a dream. Heirs some pictures of mine.

http://www.mazdarotaryclub.com/forums/showthread.php?t=34573&highlight=erdin

 

[redrx7]

Mallory #29625 Yes this is the one i was going to use originally. it looks like a big coil in the pic, how many are you useing.

 

[redrx7]

so when looking at the specs what is meant by Turns ratio and the Inductance.

 

[1BAD801]

Here is a site that explains it.

http://www.voltech.com/support/articles/59/Turns Ratio (104-113).pdf

Good looking and fast car you have.
Looks like you have the correct combination.

Try some Royal Purple oil products, and Marvel Myatery oil as an octane booster/ top end lube.
The oil helped my turbo Conquest quite a bit.
The gear lube took away the gear noise common in the rearend
of Vettes.

 

[redrx7]

Thanks that helps me understand a bit better.