Coil on plug system for 2011 CBR250R - Honda CBR250R Forum : Honda CBR 250 Forums
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post #1 of 15 Old 03-21-2015, 12:38 AM Thread Starter
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Coil on plug system for 2011 CBR250R

Hey guys,

Sorry if this is the wrong place to post this. It seemed like the most appropriate place.

We have a 2011 CBR250R engine (single cylinder) for our Formula Hybrid car and we'd like to convert it to coil on plug. Unfortunately I haven't come across anything that's guaranteed to work. The reason we want to do this is because the factory coil is not a direct fire unit, but our ECU (Electromotive TECs) only supports direct fire coils.

If there is anything out that which would help, I'd be very interested.

Thanks!
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post #2 of 15 Old 03-21-2015, 12:52 AM
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From my understanding, direct fire simply means that the energy does not travel through a distributor rotor and cap. As the CBR250R engine is a single-cylinder, it has no distributor and is inherently "direct fire."

Any kind of ignition module should be capable of supplying and then interrupting primary current to any coil. Why do you suspect that you can't use the OEM Honda coil?

P.S. Are you a student at MSOE?
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post #3 of 15 Old 03-21-2015, 12:56 AM Thread Starter
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I may be using the Direct Fire Terminology wrong. Basically the ECU doesn't sink the current for the coil directly. It sends a TTL signal to the coil and the circuitry in the coil actually takes care of the firing. Now that I think about it, that pretty much sounds like the opposite of direct fire....

As a matter of fact, I am a student at MSOE. How'd you guess?
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post #4 of 15 Old 03-21-2015, 01:16 AM
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Lol, it takes a Raider to spot a Raider...

So, there are two things at work here:

1) Direct fire = no distributor / rotor between coil and spark plug

2) ECU capable of directly interrupting primary coil current vs. ECU only able to deliver a low-voltage trigger signal to a pilot device that handles interruption of primary coil current.

I would think that implementing a coil that has integrated pilot circuitry to make/break primary coil current is a better match to your TTL-output ECU, than a standard coil that would need a discrete pilot circuit.

I don't think there is anything particularly special about the ignition needs of the CBR250R engine. I don't have the spark plug gap and compression ratio specs in front of me at the moment, but I would say that any integrated coil (I'm making up that term to mean a device that accepts TTL-level input and is able to control the coil primary) should be able to deliver sufficient secondary voltage to jump the gap and would be entirely suitable.

==============

I was aware of Formula SAE but not Formula Hybrid...pretty cool!

https://youtu.be/SIXSjIh5KZQ

Last edited by Stichill; 03-21-2015 at 01:27 AM. Reason: Add video link
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post #5 of 15 Old 03-21-2015, 01:34 AM
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Pulse Electronics

This might be an OEM / Tier automotive supplier that is focused on business-to-business not consumer...but I am willing to bet they would give you guys some free product in exchange for putting their logo on your car and whatever other promotional channels you have, e.g. Facebook. Click image to go to their website.

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post #6 of 15 Old 03-21-2015, 01:40 AM
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The STMicroelectronics VB921 is an IC that is a TTL-level ignition driver, if you guys want to build your own pilot circuit on a PCB/breadboard.
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post #7 of 15 Old 03-21-2015, 01:46 AM
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OK, this might be the perfect solution...and at $72 pretty darned cheap.

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post #8 of 15 Old 03-21-2015, 02:45 AM Thread Starter
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Awesome, thanks for the info!

After some rummaging around in the garage I found that exact coil! (What are the odds?)

I'll have to try it out and see how it works.


So, out of curiosity, what's your major and when did you graduate? I'm a sophomore EE right now, and unfortunately I'm the only EE on the team...

Also, Formula Hybrid is pretty fun, but I feel like I would've enjoyed FSAE more back when MSOE had some kick ass cars!
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post #9 of 15 Old 03-23-2015, 03:40 AM
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Well whaddyaknow?

Best of luck to you and the team!
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post #10 of 15 Old 03-23-2015, 10:16 AM Thread Starter
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Thanks for the help!
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