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Dwell angle, mixture, and timing
Posted by TS (more from TS) on Thu, 14 Sep 2000 19:36:44
In Reply to: 99 Carb/timing woes, frustrated!!, Tue, 12 Sep 2000 21:40:32
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Hi,
I had a 1978 99 with the same carb a few years ago.
The dwell angle is the amount of time per revolution that the contact breaker remains closed. It is set by the position of the contact breaker. Can't remember the figure off hand, but Haynes gives it (around 50deg?). You need a dwell angle meter (many rev counters can perform the function) to measure it. If you don't have one, don't worry about it for now. It is only really important for fine-tuning. You can get the engine running reasonably well without setting it.
On my car (which I think used the same carb as yours) the mixture was set by adjusting the needle. Remove the dashpot cap (at the top of the carb), then use a carb adjusting tool to screw the needle in/out. The procedure is also outlined in the Haynes manual.
As for the timing, I think it is quite sensitive to the grade of fuel being used (remember, there's no APC, no engine management). I think the 17deg setting is for a high octane fuel (something like 98 RON). An earlier setting will be required for lower octane fuels. If you find your car runs well at 25deg with the fuel available, leave it there!
One last thing, regularly check the diaphragm in the carb, they go regularly (or at least they did on mine).
Good luck!
Posts in this Thread:
- 99 Carb/timing woes, frustrated!!, Tue, 12 Sep 2000 21:40:32
- Re: 99 Carb/timing woes, Andy , Sun, 17 Sep 2000 18:45:36
- Dwell angle, mixture, and timing, TS, Thu, 14 Sep 2000 19:36:44 <-- Viewing This Message
- Re: 99 Carb/timing woes, JohnC, Wed, 13 Sep 2000 19:10:05
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