Weber 40 DCOE Jetting Setup for 71 GTV - Alfa Romeo Bulletin Board & Forums
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post #1 of 7 (permalink) Old 02-02-2005, 07:47 PM Thread Starter
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Weber 40 DCOE Jetting Setup for 71 GTV

My neglected 71 GTV is sitting waiting for me to get some new jets for the Weber's that were so obviously setup incorrectly in the first place. The engine is very fresh and has had a few modifications performed. John Norman did some head work that included some bigger valves and Peditori Cams (unfortunately the former owner did not have the specs ). At any rate I am looking for a baseline setup to start with with perhaps a few suggestions on other jets I might like to have on-hand to fine tune with.

I know this topic has been posted a million times before. Just one more time..for me.


[COLOR=Indigo]'71 GTV[/COLOR]
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post #2 of 7 (permalink) Old 02-03-2005, 12:04 AM
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I see your from Iam I, do you know About the Alpine 500?its A vintage car rally in april.Barbers shop Alfa will be going,as well as A few customers it should be fun.if you or any one else is interested let me know, and I will get you some info.its 500 miles over two days,starting in Sac and ending in sac $250.00 gets ya A room for two @ the Calneva north shore Lake tahoe A rally pack and Dinner for two at the end of the rally.
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post #3 of 7 (permalink) Old 02-04-2005, 10:28 AM Thread Starter
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Alpine 500

Thanks for the info on the Alpine 500. I am checking into it.

Carb info: No one has a basic base line of jets to use?????



[COLOR=Indigo]'71 GTV[/COLOR]
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post #4 of 7 (permalink) Old 02-04-2005, 12:14 PM
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If your car is a 1750, the venturis should be around 32-34mm depending on tune. Main jets are roughly 4xVenturi size (for 32mm venturi use 130-135 main jet) and idle jet can be 50F8 for most Weber applications. F16 or F9 are good emulsion tubes, part-throttle acceleration will determine best one.
Pittatore (this is the right name) is a cam factory in Torino, making zillions of standard cams for the automotive industry, not necessarily specialized in hi-perf cams. Someone should measure your cams and determine the proper compression ratio needed, timing settings, valve/piston clearances etc.
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post #5 of 7 (permalink) Old 02-04-2005, 12:27 PM Thread Starter
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Thanks for the setup info. I will give Redline a call and get those parts on their way. If I could read Wes Ingram's handwriting I probably have all of the specs. I have copies of all the worksheets he did on the engine, but his handwriting is almost hieroglyph.


[COLOR=Indigo]'71 GTV[/COLOR]
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post #6 of 7 (permalink) Old 02-04-2005, 12:34 PM
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Standard specs for 1750:

Venturi 32
Main jet 130
Air corr 200
Emulsion F-9
Idle jet 50F8
Start jet 65F5

Per the Centerline catalog- sea level application

Used the above for my 1750 Super- works very well

Mike Macaulay

69 Spider
69 GTV
74 GTV
84 Spider Veloce
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post #7 of 7 (permalink) Old 02-07-2005, 09:53 PM
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Needle and seat 150, pump back bleed 060, pump jet 035, aux. venturi 4.5, don't forget those
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