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pud pud is offline
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Porsche 912 1969 missing on excelleration

Hi , 912 1969 missing now and again on excelleration, any iideas,
Old 01-10-2018, 08:43 AM
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Hello - can you please provide some more details on your question. Are there any specific conditions that this happens on? How is the idle?
Old 01-10-2018, 10:07 AM
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Hi, the idle is good , engine starts easily, it happens when I press harder on the gas , and is intermittent.
Old 01-10-2018, 10:50 AM
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Idle jets could have some debris, you could remove and clean them?
Old 01-10-2018, 05:18 PM
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Russ
 
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Could be an issue with the carb accelerator pump???

Does it miss or does it hit a flat spot during acceleration? If it does it could be related to ignition/ distributor
Old 01-11-2018, 03:45 AM
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I have new plugs in , have checked carbs are tightly bolted down, I have been running it with the idling screws only out about 3/4 of a turn , as the plugs were sooting up s bit i thought it was running a bit rich , ? I’m running new Webber 40 idf carbs ,

Last edited by pud; 01-11-2018 at 05:35 AM..
Old 01-11-2018, 05:32 AM
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Russ
 
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If your plugs are sooty and not wet you could be running rich. You could try a larger main fuel jet. If you're running a 170 try a 180.
Also, it very well could be ignition related. Be sure to check the wires & distributor for bad components.
Old 01-11-2018, 06:29 AM
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I have now screwed out the fuel jets to one turn out , it’s running well with no missing but checked plugs and now sooty black , I’m using W5BC Bosch spark plugs ,

Last edited by pud; 01-11-2018 at 12:16 PM..
Old 01-11-2018, 11:16 AM
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Porsche 912 1969 1600cc engine

Hi , I have a Porsche 912 targa 1969 original engine , which will be 1600cc I understand, I have purchased Webber IDF 40 carbs , I have been running with this set up that was done at the carb shop , 32 mom chokes,140 mains, F7 emulsion tubes, 180 airs, 55 idles, I have 3psi petrol pressure, as you know I have had sooty plugs and exhaust tailpipe, I have talked to eurocarb who supplied the carbs and he said they have been set up for a 2litre engine , so have now been sent different bits , consisting of , 28 mm choke , 125 main jet ,200 air jet, F11emulsion tubes , hows that sounding , will it run better and the sooty plugs stop , cheers , Andy .
Old 01-15-2018, 04:42 AM
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Russ
 
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Andy,
That should help. Sounds like a good carb set up
Old 01-15-2018, 05:07 AM
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Thanks Russ, so the old set up was way out then ? Would that explain the sooty plugs running rich ,
Old 01-15-2018, 05:43 AM
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Russ
 
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Yes. The fuel/air mixture was too rich. You probably could have exchanged the main fuel jet from the 180 to the 200. But the new carb setup should be complete and work well.

You may need to riching the fuel mixture when temperatures rise.

You could also play around with the your spark plugs.
How to read NGK spark plug codes | Blasterforum.com
Old 01-15-2018, 05:55 AM
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Thanks Russ, will let you know when it’s all completed and I’m up and running again on the performance of the engine .
Old 01-15-2018, 06:19 AM
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