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| Question of timing https://www.slantsix.org/forum/viewtopic.php?t=24341 |
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| Author: | Guppy [ Sun Aug 05, 2007 11:04 am ] |
| Post subject: | Question of timing |
When checking the timing, I noticed that cyl #1 was 5 degrees off from cyl #6. Shouldn't they be identical? I just wanted a second reference so I moved the timing light pickup from #1 to #6...? Anyone know why that would be? |
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| Author: | Slant6Ram [ Mon Aug 06, 2007 7:43 am ] |
| Post subject: | Not unique |
I have noticed the same about a couple of the motors that I have tuned. As far as I can understand, #1 and #6 should look the same with a timing light (just on a different turn of the crank), but they don't always. I don't know why that is, but it's not just your motor. Logically, I'd want to split the difference between the two. 5 degrees indicates a notable variance in the construction of your distributor. Maybe the reluctor is bent or just poorly made. This is the only place I can think that a deviation could come from. If you are running points, it's the same area 'the trigger'. |
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| Author: | Guppy [ Mon Aug 06, 2007 10:03 am ] |
| Post subject: | |
In a circumstance like this, how would you set the timing? - 2.5 degrees on cyl #1 and have #6 read 7.5 degrees? - Split the difference and set timing @ 0 for cyl #1 to have cyl #6 read 5 degrees? - Set timing according to how the engine sounds & runs the best? any or none of the above? |
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| Author: | Slant6Ram [ Mon Aug 06, 2007 2:54 pm ] |
| Post subject: | Not sure |
You could try any of your ideas, but I think I'd split the difference for temporary. I have an inquisitive streak in me, so I might be pulling the distributor and checking for a problem. I know for a fact that one of the distributors had a bent shaft and that may have caused the variance. Paul |
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| Author: | Matt Cramer [ Mon Aug 06, 2007 5:25 pm ] |
| Post subject: | |
What sort of ignition do you have? Points? Mopar electronic? Pertronix? |
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| Author: | Rug_Trucker [ Mon Aug 06, 2007 5:43 pm ] |
| Post subject: | |
I had a 383 that the lobes were wore out on 3 cylinders in a row. They didn't fire until you hit 3000rpm. That was points, that was when I was in college and I had access to a distributor machine.  Try grabbing the shaft and check side to side play. There is specs for that somewhere. |
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| Author: | Guppy [ Thu Aug 09, 2007 5:45 am ] |
| Post subject: | |
I measured the timing on points before switching to Pertronix. The Ignitor II is in there now. |
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