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Irish31
Samba Member
Joined: May 17, 2018
Posts: 26
Location: Princeton, IN
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 Posted: Tue Jul 10, 2018 10:55 pm Post subject: Timing retards upon acceleration? |
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| Recently installed a CB Megaspark II system. Static timing set around 8 degrees BTDC. When accelerating, the dynamic timing appears to be retarding back towards the zero mark. Please help me understand why this is happening. Thanks. Jack |
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oprn
Samba Member
Joined: November 13, 2016
Posts: 12730
Location: Western Canada
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| Posted: Wed Jul 11, 2018 4:15 pm Post subject: Re: Timing retards upon acceleration? |
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| Are you sure that the initial timing is in fact 8* BTDC and not *8 ATDC? If it were 8*ATDC then it would indeed appear to be going the wrong way... |
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drumbum68
Samba Member
Joined: October 15, 2010
Posts: 566
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| Posted: Fri Jul 13, 2018 11:43 am Post subject: Re: Timing retards upon acceleration? |
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| Installed upside down. |
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mark tucker
Samba Member
Joined: April 08, 2009
Posts: 23937
Location: SHALIMAR ,FLORIDA
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| Posted: Fri Jul 13, 2018 2:41 pm Post subject: Re: Timing retards upon acceleration? |
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| spark going backwards? |
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Irish31
Samba Member
Joined: May 17, 2018
Posts: 26
Location: Princeton, IN
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| Posted: Sat Jul 14, 2018 9:58 pm Post subject: Re: Timing retards upon acceleration? |
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| Yes, I am sure that the degrees crank is firing at 8 degrees BTDC. Not entirely sure what is meant by installed upside down. Spark going backwards? You mean like the engine running counterclockwise? |
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SubbinNCali
Samba Member
Joined: November 13, 2013
Posts: 75
Location: St. Louis, MO
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| Posted: Sun Jul 15, 2018 3:26 am Post subject: Re: Timing retards upon acceleration? |
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| What timing gun do you have? Does yours have a variable setting? Is it set to zero? |
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oprn
Samba Member
Joined: November 13, 2016
Posts: 12730
Location: Western Canada
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| Posted: Sun Jul 15, 2018 5:01 am Post subject: Re: Timing retards upon acceleration? |
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| Irish31 wrote: |
| Yes, I am sure that the degrees crank is firing at 8 degrees BTDC. Not entirely sure what is meant by installed upside down. Spark going backwards? You mean like the engine running counterclockwise? |
Those were just snide comments not intended to be helpful.
I just mentioned the BTDC/ATDC thing because not too long ago after a distributor change I thought I had the same problem and it took me a few minutes to realize I had static timed it on the wrong side of TDC. |
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modok
Samba Member
Joined: October 30, 2009
Posts: 26787
Location: Colorado Springs
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| Posted: Sun Jul 15, 2018 1:45 pm Post subject: Re: Timing retards upon acceleration? |
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| It is possible for the distributor to do this, OR the timing light to do that, if certain electronic components have failed, or maybe if the VR sensor was connected reverse polarity, or something like that. I'd check with another timing light first before sending it back. |
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Irish31
Samba Member
Joined: May 17, 2018
Posts: 26
Location: Princeton, IN
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| Posted: Tue Jul 17, 2018 8:33 am Post subject: Re: Timing retards upon acceleration? |
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| OK, I will check this with another timing light. Thanks, Jack |
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Irish31
Samba Member
Joined: May 17, 2018
Posts: 26
Location: Princeton, IN
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| Posted: Sat Jul 21, 2018 7:46 am Post subject: Re: Timing retards upon acceleration? |
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| Tried a different timing light and the engine responded normally. Thanks for your help guys. Problem solved. |
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