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Timing light with wasted spark

 
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aml15



Joined: 07 Oct 2012
Posts: 43

PostPosted: Tue Dec 29, 2015 12:50 pm    Post subject: Timing light with wasted spark Reply with quote

Hi.
I hope someone can confirm a thing for me.

When checking ignition timing with a timing light on a wasted spark setup, This is correct?

When using a dial back light, you have to either set it to 2 stroke mode, or divide the ignition timing by 2 since the light will read double rpm.
But when using a fixed timing light, the ignition timing you read on the crank wheel is the correct timing without any mod?
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baldur



Joined: 12 Oct 2007
Posts: 623
Location: Reykjavik, Iceland

PostPosted: Tue Dec 29, 2015 1:00 pm    Post subject: Reply with quote

Correct. Dial-back timing lights are a giant waste of time IMO. Less accurate than the basic fixed variety with no bells and whistles. But I guess some applications call for them.
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aml15



Joined: 07 Oct 2012
Posts: 43

PostPosted: Tue Dec 29, 2015 1:56 pm    Post subject: Reply with quote

baldur wrote:
Correct. Dial-back timing lights are a giant waste of time IMO. Less accurate than the basic fixed variety with no bells and whistles. But I guess some applications call for them.


Good, just wanted to confirm.. (only time i see a use for a dial back light is when timing engines with non efi distributer ignition ( usually old v8`s)
other than that i always use my fixed ones..
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stevieturbo



Joined: 29 Aug 2006
Posts: 1235
Location: Norn Iron

PostPosted: Tue Dec 29, 2015 2:01 pm    Post subject: Reply with quote

Test at 0deg and it will be correct either way.

Or always test at different timing and rpm values that way there is no chance of error as any patterns will be blatantly obvious
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