 Timing question |
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| rjames |
 May 4 2023, 01:29 PM
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I'm made of metal  Group: Members Posts: 3,933 Joined: 24-July 05 From: Shoreline, WA Member No.: 4,467 Region Association: Pacific Northwest 
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Have seen this posted in numerous places. It's apparently out of the factory manuals. ((source)
 If the chart is correct, the advance for the 2.0 liter engines is 20-24 degrees @ ~3000rpm Why then is it listed in all of the documentation I've read to set advance at 27 degrees? From Bosch manual showing 22-25 degrees at 2900 rpm. (I had 205A distributor since replaced with a 123 unit)  |
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| sportlicherFahrer |
May 4 2023, 02:16 PM
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Nothing to see here. Group: Members Posts: 1,079 Joined: 18-April 05 From: Tacoma, WA Member No.: 3,945 Region Association: Pacific Northwest
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Chart is showing the total timing ability of a given distributor, not the timing spec for any given engine. The 2.0 timing spec is base timing PLUS the advance pulled in by the distributor at full advance RPM. So if you subtracted the distributor advance from the total number and checked timing at idle you'd see around 5* at the lower RPM.
Many of the VW engines are timed opposite of this. Set base timing to the spec at idle, and then the distributor does the rest. If you checked those at full advance RPM you'd see close to the same total advance numbers. |
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| porschetub |
May 4 2023, 04:15 PM
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#3
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Advanced Member Group: Members Posts: 4,699 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(sportlicherFahrer @ May 5 2023, 09:16 AM)  Chart is showing the total timing ability of a given distributor, not the timing spec for any given engine. The 2.0 timing spec is base timing PLUS the advance pulled in by the distributor at full advance RPM. So if you subtracted the distributor advance from the total number and checked timing at idle you'd see around 5* at the lower RPM. Many of the VW engines are timed opposite of this. Set base timing to the spec at idle, and then the distributor does the rest. If you checked those at full advance RPM you'd see close to the same total advance numbers. (IMG:style_emoticons/default/agree.gif) well said...as long as the dizzy isn't all gummed and not advancing fully,the 205 series are bad for this and they can return slowly or not @ all and upset the idle . |
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| NARP74 |
May 4 2023, 04:41 PM
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Senior Member Group: Members Posts: 1,065 Joined: 29-July 20 From: Colorado, USA, Earth Member No.: 24,549 Region Association: Rocky Mountains |
@sportlicherFahrer respond to this post and you will hit 1000! WooHoo!
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| rjames |
May 4 2023, 04:55 PM
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#5
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I'm made of metal Group: Members Posts: 3,933 Joined: 24-July 05 From: Shoreline, WA Member No.: 4,467 Region Association: Pacific Northwest
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QUOTE(sportlicherFahrer @ May 4 2023, 01:16 PM) Chart is showing the total timing ability of a given distributor, not the timing spec for any given engine. The 2.0 timing spec is base timing PLUS the advance pulled in by the distributor at full advance RPM. So if you subtracted the distributor advance from the total number and checked timing at idle you'd see around 5* at the lower RPM. Many of the VW engines are timed opposite of this. Set base timing to the spec at idle, and then the distributor does the rest. If you checked those at full advance RPM you'd see close to the same total advance numbers. Makes total sense. Not sure how I missed understanding this until now. Thank you! |
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| sportlicherFahrer |
May 5 2023, 09:22 AM
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#6
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Nothing to see here. Group: Members Posts: 1,079 Joined: 18-April 05 From: Tacoma, WA Member No.: 3,945 Region Association: Pacific Northwest
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QUOTE(rjames @ May 4 2023, 03:55 PM) Makes total sense. Not sure how I missed understanding this until now. Thank you! You're welcome! (IMG:style_emoticons/default/beerchug.gif) QUOTE(NARP74 @ May 4 2023, 03:41 PM) 1K!!!!! (IMG:style_emoticons/default/smilie_pokal.gif) (IMG:style_emoticons/default/smilie_pokal.gif) Only took me 18 years to get there! (IMG:style_emoticons/default/blink.gif) (IMG:style_emoticons/default/type.gif) (IMG:style_emoticons/default/aktion035.gif) |
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