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Registered
Join Date: Aug 2003
Location: Galway, Ireland
Posts: 3
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914-6 Weber Jetting Question
I have a 1970 914/6 which has the original 2.0 Stock Engine
It appears to be running rich ( high fuel consumption ~18mpg (european gallon) It has 110 mains and 55 Idles THe Haynes Weber book and elsewhere lists 105 Mains SHould I switrch to these 105's?? THanks Brian Doody |
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05-25-2004, 04:04 AM
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914 Geek
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The mains are only used when the throttle gets more than about 1/3 of the way open, so the car actually runs on the idle jets most of the time.
I don't know what kind of jetting is recommended for 2.0 "T" motors, but I seem to recall Jim Pasha talking about going up a size in the venturis and possibly the idles as well to get more power out of the motor. Probably not that good for economy, though. I'd think about going down on the idle jet size... But try the adjustments and such first! --DD
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Pelican Parts 914 Tech Support A few pics of my car: http://www.pelicanparts.com/gallery/Dave_Darling |
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05-25-2004, 09:53 AM
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Registered
Join Date: Dec 1969
Location: chula vista ca usa
Posts: 5,721
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When was the last time the carbs were cleaned and rebuilt? With the crappy gas we have in California the carbs tend to get goop much faster now than before so rebuilds are more necessary. How do the plugs look? Are they sooty or just nice and brown? If sooty then the engine could be too rich.
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05-25-2004, 12:25 PM
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Stay away from my Member
Join Date: Aug 1999
Location: Agoura, CA
Posts: 5,773
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I think your best bet is to return to stock 914-6 jetting if your engine is basically stock and in good condition, and you live close to sea level (quite likely in Ireland
 ).If you need expert jetting advice or parts, Richard Parr at PMO here in California is one of the real Weber gurus left. He can provide any jets you might need, although I suspect you could source them locally or from Italy as well. FWIW my car had too-large venturies and other carb issues when I bought it. Don't take anything for granted! Your car should have come with 27mm primaries/chokes.
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Chris C. 1973 914 "R" (914-6) | track toy 2009 911 Turbo 6-speed (997.1TT) | street weapon 2021 Tesla Model 3 Performance | daily driver 2001 F150 Supercrew 4x4 | hauler |
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05-25-2004, 09:21 PM
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canna change law physics
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Original Settings
Choke 27mm Aux Vin 4.5 Main Jet 1.05 Idle Jet 0.50 Air Idle 1.45 Emulsion Tube F1 Air Corr 2.00 Acc Pump 0.50 Needle valve 1.75
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James The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994) Red-beard for President, 2020 |
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05-25-2004, 10:22 PM
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Registered
Join Date: Aug 2003
Location: Galway, Ireland
Posts: 3
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Folks, Thanks
Yes the carbs are in good condition and clean, I completely rebuilt them last summer - Everything is running very well with the current jetting nice smooth tickover and power delivery - But I cannot get more than about 18mpg + the exhaust is a bit sooty Yes Im only about 50 feet above sea level on the West Coast Of Ireland regards Brian |
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05-26-2004, 01:31 AM
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74 Porsche 914 2.0 
1970/1982 Porsche 914-6/911SC 2.7 RS
