Help me set my ignition timing! (SCCA 13B)
#1
****** of disaster
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Help me set my ignition timing! (SCCA 13B)
I'm running a S5 13B with an '84 distributor and a MegaSquirt ecu controlling fuel in an SCCA EP racecar. Engine is a big streetport. I have the Mazdaspeed main pulley which has timing marks at 0, 5, 10 and 20* ATDC.
I have almost 0 experience with rotary ignition and even less experience with distributors - I've been told by some people that I should have my timing light with the dial on 0, and aim for ~0* leading (TDC) and around 20* ATDC for the trailing - is this accurate? Others have said that I should double the desired timing on the dial and set that way. I know how to rotate the dizzy and adjust the trailing timing.
What are some optimal 13B timing numbers? How should I be using my timing light?
Totally confused, please help!
I have almost 0 experience with rotary ignition and even less experience with distributors - I've been told by some people that I should have my timing light with the dial on 0, and aim for ~0* leading (TDC) and around 20* ATDC for the trailing - is this accurate? Others have said that I should double the desired timing on the dial and set that way. I know how to rotate the dizzy and adjust the trailing timing.
What are some optimal 13B timing numbers? How should I be using my timing light?
Totally confused, please help!
Last edited by thetech; 04-11-07 at 09:58 PM.
#2
Rotary Freak
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I think that Paul Yaw said 26 leading and 10 training for 13B (24 and 10 for a 12A).
If you run a search I am sure you will get the details. I will see if I can find it.
I have been watching your post in the Megasquirt section and I am intrigued. I am planning on something similar to your setup.
If you run a search I am sure you will get the details. I will see if I can find it.
I have been watching your post in the Megasquirt section and I am intrigued. I am planning on something similar to your setup.
#4
Rotary Freak
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Yikes... the search function is off tonight.
Well, here is Paul Yaw's site (Timing page) - http://www.yawpower.com/pultime.html
He says 26 leading and 16 trailing.
Well, here is Paul Yaw's site (Timing page) - http://www.yawpower.com/pultime.html
He says 26 leading and 16 trailing.
#5
Can't Hear Now
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Originally Posted by thetech
Thanks. Are those 26/10 numbers ATDC @ 4000rpm? Should I be using a timing light at 0* and going off the marks on the pulley?
The 26/16 BTDC numbers are a good place to start. You can start there and then adjust it slightly up or down to see where yours runs best.
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