Is this statement true?
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U.S. Army Recon 93-04
Joined: Feb 2007
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From: Seminole,Fl
Is this statement true?
"The leading plugs always fire at the same time every time."
so assuming this is correct, and you have the leading plugs timed to stock settings, the next step is to time the trailing plugs @ 15 advance which will give me 22 advanced on the leading..Correct?
so assuming this is correct, and you have the leading plugs timed to stock settings, the next step is to time the trailing plugs @ 15 advance which will give me 22 advanced on the leading..Correct?
Joined: Feb 2001
Posts: 29,798
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From: London, Ontario, Canada
The leading plugs are fired wastespark, so yes, they fire at the same time.
I have never seen the point of checking trailing timing. On the stock ECU, as long as timing is set properly with the leadings, the trailings are fine. On a standalone, you can set whatever split you want but it will be as commanded by the ECU so no need to check.
I have never seen the point of checking trailing timing. On the stock ECU, as long as timing is set properly with the leadings, the trailings are fine. On a standalone, you can set whatever split you want but it will be as commanded by the ECU so no need to check.
there really is no way the trailings can become out of time with the leadings, checking their timing is a waste of time. there is a few reasons why the split will turn to 0 though, which is an input to the ECU issue or incorrect idling. i only check them to make sure they are in fact firing.
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U.S. Army Recon 93-04
Joined: Feb 2007
Posts: 428
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From: Seminole,Fl
Thank you guys, good refresher for me.
My memory was telling me , if I timed the trailing #2 to match with the stock leading timing mark for number #1, I would get optimum timing for road race usage. 22 and 15 is this wrong also? I was basically looking for a fast and quick way to check timing on cars, that aren't mine, in line at the track waiting for the next run, as I am starting up my club and we have over 19 cars already
My memory was telling me , if I timed the trailing #2 to match with the stock leading timing mark for number #1, I would get optimum timing for road race usage. 22 and 15 is this wrong also? I was basically looking for a fast and quick way to check timing on cars, that aren't mine, in line at the track waiting for the next run, as I am starting up my club and we have over 19 cars already
Joined: Mar 2001
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From: https://www2.mazda.com/en/100th/
the leading spark plugs are on the same electrical circuit, so they both (L1 and L2) fire at the same time.
HOWEVER this has NOTHING to do with the spark timing. or they do not fire at the same time every time in relation to the engine.
the ECU is capable of delivering spark from something like -20Atdc to 48 BTDC...
Thank you guys, good refresher for me.
My memory was telling me , if I timed the trailing #2 to match with the stock leading timing mark for number #1, I would get optimum timing for road race usage. 22 and 15 is this wrong also? I was basically looking for a fast and quick way to check timing on cars, that aren't mine, in line at the track waiting for the next run, as I am starting up my club and we have over 19 cars already
My memory was telling me , if I timed the trailing #2 to match with the stock leading timing mark for number #1, I would get optimum timing for road race usage. 22 and 15 is this wrong also? I was basically looking for a fast and quick way to check timing on cars, that aren't mine, in line at the track waiting for the next run, as I am starting up my club and we have over 19 cars already
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