 New Timing Light Time |
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| yeahmag |
 Oct 27 2017, 08:03 PM
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#1
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Advanced Member  Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California 
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No good deed goes unpunished...
At some point I lent my trusty, old timing light (dial back style) to someone. No idea who and no one so far has offered to return it. So, I need a new one. Couple of problems though. * Most new(er) dial back and (all) digital lights reportedly don't work with a multi-spark CDI ignition system. * Assuming I need to now buy a "simple" (non-advance) light. How the hell do I know what my timing is set at? Certainly I can hit the 27 BTDC mark and goof around from there, but I'd really like to know EXACTLY what my timing is set at! What do others with an MSD or Mallory use? If using a "simple" light, how do you hit, say 28-30 BTDC? -Aaron |
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Replies(1 - 11)
| Dave_Darling |
Oct 27 2017, 08:25 PM
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#2
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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If you're using a non-dial timing light, the best way to tell what the timing is would be to use a timing scale. Much easier in a Bug, though, as the crank pulley is easily visible from the engine lid opening. Note that some of the Type IV Buses had timing scales bolted onto the fan shroud. Doesn't help that much in a 914, though.
You can paint the edges of the fan so you can see different marks through the timing hole. You get a somewhat limited resolution that way, but you can estimate how far between marks you currently are and get some appreciation of your current timing that way... --DD |
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| Mueller |
Oct 27 2017, 08:37 PM
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#3
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None
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As posted on your FB post, check out Pelican for their tech article with template for those numbers.
No idea on the CDI or how to bypass or trick it. http://www.pelicanparts.com/techarticles/9.../914_timing.pdf |
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| Montreal914 |
Oct 27 2017, 09:20 PM
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#4
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Senior Member Group: Members Posts: 1,586 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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| yeahmag |
Oct 27 2017, 09:23 PM
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#5
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Advanced Member Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California
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Math rules... I was able to use the Pelican Parts template (data) and the following website to calculate the distances for 28 BTDC and 32 BTDC
28 = 2.1259" 30 = 2.2778" I used the distance provided for the arc (2.05") and the degrees of the arc (27) to find the radius (4.3502"). From there, you can calculate and arc length based on any degree you want! http://1728.org/radians.htm Now to make a template and make some marks on the fan. |
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| yeahmag |
Oct 27 2017, 09:29 PM
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#6
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Advanced Member Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California
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That's the light I had!
-Aaron QUOTE(Montreal914 @ Oct 27 2017, 08:20 PM)  Used one... (IMG:style_emoticons/default/confused24.gif) https://losangeles.craigslist.org/sgv/tls/d...6355208084.html |
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| Montreal914 |
Oct 27 2017, 09:37 PM
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#7
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Senior Member Group: Members Posts: 1,586 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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QUOTE(yeahmag @ Oct 27 2017, 08:29 PM) That's the light I had! -Aaron QUOTE(Montreal914 @ Oct 27 2017, 08:20 PM) Used one... (IMG:style_emoticons/default/confused24.gif) https://losangeles.craigslist.org/sgv/tls/d...6355208084.html Might be yours... (IMG:style_emoticons/default/rolleyes.gif) |
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| yeahmag |
Oct 27 2017, 09:55 PM
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#8
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Advanced Member Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California
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| michael7810 |
Oct 28 2017, 07:20 AM
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#9
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Senior Member Group: Members Posts: 1,081 Joined: 6-June 11 From: Scottsdale, AZ Member No.: 13,164 Region Association: Southwest Region
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Does anyone know where to get a replacement clamp-style pickup for an old timing light? Mine disintegrated from age and I can get it to work with rubber bands and tape but it's a royal PITA. I have MSD and was going to buy a new light but after reading this I need to keep my old one going. Thanks
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| bandjoey |
Oct 28 2017, 12:49 PM
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#10
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bandjoey Group: Members Posts: 4,926 Joined: 26-September 07 From: Bedford Tx Member No.: 8,156 Region Association: Southwest Region |
My 2cents. Since I only use it every couple years. The HF light with dial adjustable works for me.
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| johnhora |
Oct 28 2017, 01:50 PM
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#11
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Senior Member Group: Members Posts: 867 Joined: 7-January 03 From: Derby City KY Member No.: 107 Region Association: None
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| mb911 |
Oct 28 2017, 02:47 PM
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#12
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914 Guru Group: Members Posts: 6,881 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest
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QUOTE(yeahmag @ Oct 27 2017, 07:29 PM) That's the light I had! -Aaron QUOTE(Montreal914 @ Oct 27 2017, 08:20 PM) Used one... (IMG:style_emoticons/default/confused24.gif) https://losangeles.craigslist.org/sgv/tls/d...6355208084.html I have one of those lights. They are great.. |
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