SuzukiSavage.com - Spark timing / CDI Unit

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Spark timing / CDI Unit (Read 131 times)

metri

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I love YaBB 1G -
SP1!

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Ottawa, Ontario
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Spark timing / CDI Unit
11/15/08 at 06:31:32

Hello,

I'm currently working on an Electrical Engineering project for school and have chosen to build a CDI unit. I found the plans online and ordered the parts and built the circuit. Now it runs on a bench, but it's designed for a different bike. I'm wondering a few things about the Savage spark system to figure out if it's possible to modify my current circuit to fire the savage (I'd get bonus marks Tongue

).

The questions are:
Does anyone know when the sensor sends the pulse to the CDI? and if there is one sensor or two. On some bikes there are 2 pickups for timing (12 and 36 degree's I think) and on other only 1.

The plans I'm following are on this page if anyone wants to have a look.
http://www.transmic.net/gb1684-V53.htm

Any thoughts on wether or not it's possible to make this work on a Savage would be much appreciated. Thanks again

Brian

1987

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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28884 L.A. California Gender:	Re: Spark timing / CDI Unit Reply #1 - 11/15/08 at 07:54:31 Haven't been in there, but pretty sure there's only one pick up not sure but this might be it. I'm sure you can make it work but may take some doing, get a round one, it will help. You'll just need to add a pickup for the 36° sensor. Get yourself a alternator gasket or 2 cause there's oil in there.
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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28884 L.A. California Gender:	Re: Spark timing / CDI Unit Reply #2 - 11/15/08 at 07:55:54 BTW, is there a circuit for a single sensors for us that might need to replace the CDI?
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mikestrikes

Ex Member

Re: Spark timing / CDI Unit
Reply #3 - 11/15/08 at 08:23:23

Yes its a single setup... sure would be nice to be able to adjust it...

I'm use to motors with a rotor setup that you can modify or replace and get different timing.

The only way I see the Savage getting that is to have the pickup coils mounting holes slotted so you can move it ....

Also does the Savage have a rev limiter ? It should.

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metri

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I love YaBB 1G -
SP1!

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Ottawa, Ontario
Gender: male

Re: Spark timing / CDI Unit
Reply #4 - 11/15/08 at 09:15:59

The circuit I'm using can work with one pickup. The biggest trouble will be to find out how many degrees before TDC the signal is fired. At the point, the circuit should be able to give any firing curve desired. I have a spare engine, I'll try taking out the sensor and figuring out when, with relation to TDC it signals...

Thanks for the help and schematic

Brian

1987

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DJM

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'06 Red S40

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Encinitas CA
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Re: Spark timing / CDI Unit
Reply #5 - 11/17/08 at 15:21:14

Hi Metri,
If you have access to an oscilloscope and a pressure sensor, here's how you measure the angle between sensor out put and TDC. You will need to us a dual trace scope, one input attached to the sensor coil.

You will need to unscrew the spark plug and screw in the a pressure sensor. Now, hook the other scope channel to the pressure sensor output and crank the engine. The pressure will peak at TDC.

Oh, so they have internet on computers now!

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smokin_blue Serious Thumper Offline From Cafes to Streetfighters! I build them all! Posts: 830 St. Paul, MN Gender:	Re: Spark timing / CDI Unit Reply #6 - 11/20/08 at 03:21:11 According to the factory manual the timing spark is 5deg BTDC below 2000 rpm and 30deg BTDC above 4,000 rmp. my guess would be one of those should be straight up signal timing. Try degreeing the crank like you would for the cams and find TDC and see how far away the signal pickup is.
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