 Timing..., How do you know when it's right/best? |
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| FlacaProductions |
 May 5 2023, 04:06 PM
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#1
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Senior Member  Group: Members Posts: 1,615 Joined: 24-November 17 From: LA Member No.: 21,628 Region Association: Southern California 
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Just set/confirmed my 2.0 timing.
Vac hose from distributer removed and plugged/2800rpm/28 degrees. It runs good, how do you how/how can you tell when it's "right" or optimal? That magic balance between power and efficiency..... |
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Replies(1 - 10)
| brant |
May 5 2023, 04:13 PM
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#2
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914 Wizard Group: Members Posts: 11,639 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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Stock cam
Follow the factory spec for sea level Higher altitude (like Colorado) You can advance another 1-2 degrees But should not if the car is also driven at sea level |
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| yeahmag |
May 5 2023, 07:12 PM
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#3
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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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Carbs, change in compression, cam change, type of fuel, etc... all make it a seductive dance of power. I started with 12 degrees BTDC at idle and 28 degrees BTDC above 3K RPM and went from there.
I'm not there now... Keep an eye on AFR and CHT and experiment. Going lean (having to add fuel) typically means you are headed in the right direction. |
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| bkrantz |
May 5 2023, 07:39 PM
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#4
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914 Guru Group: Members Posts: 7,801 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains
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Oh, I thought you meant for making a move on your date.
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| FlacaProductions |
May 5 2023, 08:07 PM
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#5
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Senior Member Group: Members Posts: 1,615 Joined: 24-November 17 From: LA Member No.: 21,628 Region Association: Southern California
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QUOTE(bkrantz @ May 5 2023, 06:39 PM)  Oh, I thought you meant for making a move on your date. That's a different forum.... (IMG:style_emoticons/default/grouphug.gif) |
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| ClayPerrine |
May 6 2023, 04:54 PM
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#6
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Life's been good to me so far..... Group: Admin Posts: 15,514 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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While playing with the timing on a Megasquirt injected Type IV, we found that anything over the 28 degrees specified in the manual resulted in a loss of horsepower and torque.
Those German engineers seem to know what they are doing. |
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| emerygt350 |
May 6 2023, 06:54 PM
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#7
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Advanced Member Group: Members Posts: 2,144 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Interesting. Has anyone else found the same ( 28)? I have kind of suspected it but I do feel perhaps the curve moves a little.
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| Dave_Darling |
May 6 2023, 11:00 PM
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#8
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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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Two ways:
1- Follow the factory specs. 2- Put the car on a dyno and try different settings. --DD |
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| emerygt350 |
May 7 2023, 04:35 AM
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#9
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Advanced Member Group: Members Posts: 2,144 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Yes, but wot pulls don't really cover real driving characteristics. On a stock 2.0 there is also idle characteristics as well as partial load response all in the mix.
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| Dave_Darling |
May 7 2023, 08:11 PM
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#10
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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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Yes, that would be part of the "try it on a dyno". The best would be ones where you can vary the load so you can test different load/RPM combinations.
--DD |
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| VaccaRabite |
May 8 2023, 05:38 AM
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#11
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En Garde! Group: Admin Posts: 13,465 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
Without a dyno or a lot of instrumentation it really is best guess.
On a stock setup - set it at 28* and walk away. On anything else... Trial and error. Back ages ago when I still had carbs, I tried advancing as high as 32 degrees - which idle LOVED but it pinged under load. Immediately backed it down to about 30 and the engine seemed to like that, but ran hotter then I liked. I eventually settled on about 29* for a season before pulling the carbs and starting the EFI journey. Zach |
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