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| 1182cc Ignition Timing https://www.ausmini.com/forums/viewtopic.php?f=5&t=59769 |
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| Author: | miniDave [ Tue Dec 22, 2009 6:39 pm ] |
| Post subject: | 1182cc Ignition Timing |
Trying to fine tune my new engine for its debut run. 
Consulting the 'black' book and it lists correct timining for a 1098cc engine as 5 degrees BTDC. Is this what I should use? Details of the engine are: 25D distributor (on points but soon on electronic) 1182 cc 10:1 compression 266 cam Twin HS2 carbies - M needle Running on BP Ultimate Fuel. Cheers |
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| Author: | drmini in aust [ Tue Dec 22, 2009 7:52 pm ] |
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With your motor spec, I'd set it about 24-25 degrees BTDC full advance with your shiny new dialback timing light. Forget the stock book settings, they are BS once the cam is changed. 
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| Author: | miniDave [ Tue Dec 22, 2009 8:45 pm ] |
| Post subject: | |
drmini in aust wrote: With your motor spec, I'd set it about 24-25 degrees BTDC full advance with your shiny new dialback timing light.
Forget the stock book settings, they are BS once the cam is changed. Thanks Kev. Thought as much. The timing light has only 'advance' degrees. So what do I dial in? Is it '-' advance? Notice the numbers run up to about 99 degrees advance. So 24 degrees advance is still 24 degrees BEFORE TDC? The timing light turned up today and when I tried it it seemed intermittent and the strobe was jumping all over the place. Maybe the plug lead sensor not in the right place. Looked really impressive in the driveway trying to tune the engine but really don't have a clue! Will dial in 24 degrees and look for the timing mark tomorrow. Have been noticing that it is running hot on the gauge so maybe my current timing is way out? |
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| Author: | drmini in aust [ Tue Dec 22, 2009 9:01 pm ] |
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Set the light at 24 degrees advance on the display. Yes, this this is BTDC. Then, rev the engine until the pulley or flywheel TDC mark stops advancing (moving)- approx 4000 rpm. If the mark then aligns with the TDC mark, it is at 24 deg BTDC. If not, move dizzy round until it is. It is normal for it to move about a bit (spark scatter) if using a chain and no tensioner. Even more if you have points. I run a timing belt kit and there is practically no scatter (with Pulsar dizzy). If running hot, it's probably a bit retarded.
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| Author: | 1018cc [ Thu Dec 24, 2009 9:48 am ] |
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I have found before that the light on my timing light goes a bit haywire when I put the inductive thing over the plug lead the wrong way around 
Maybe try that? |
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| Author: | drmini in aust [ Thu Dec 24, 2009 10:35 am ] |
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It's important to hook the 12V+ clip to somewhere NOT the coil's `+' terminal. Otherwise you get spark pulses going into the timing light 12V supply. I hook it onto the battery cable lug at the solenoid. |
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