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914World.com _ 914World Garage _ Carb Sync And Tach ?Q's

Posted by: bandjoey Aug 29 2009, 09:42 PM

1. Dellortos 34's on my 1.8. Set up the sync on 3 of the 4 carb throats to perfect #5 on the syncometer. The 4th I can't get below #6. They were set to the Dellorto book standards before installation so they were all "identical" settings when starting. Suggestions?
2. Using a Sunpro CP7676 engine analyzer. The Tachemeter reads about 800 RPM higher than the visual on the car tach. I think the Sunpro should be more accurate. Right or Wrong. Does the tach on the car go out of wack and read wrong? Is there a way to test the tach and/or adjustment the reading? Bill

Posted by: jmill Aug 29 2009, 10:13 PM

I don't know diddly about Dellortos. The Weber has air bypasses. If the Dellorto has them make sure it's closed on the high barrel. You might also have a vacuum leak on the carb with barrels flowing 2 different readings. Check for a leak on the one that flows 5. The 6 side will be tight.

If thats not it are they new carbs? If not you can check the butterflies with a feeler gauge. Make sure that the high flowing barrel isn't due to a tweaked shaft or butterfly.