Reviving NOS Webers, Initial Settings? |
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Reviving NOS Webers, Initial Settings? |
bbrock |
Mar 20 2019, 08:55 PM
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#1
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
I didn't want to hijack the other thread but have a question about my own Webers. They are Italian 40IDFs I bought in the late 80s or early 90s. Other than finger tight bolting them on to my engine to see how cool they looked, they have never been used. No fuel has touched them. I don't remember if I even opened them to set the float levels. BUT... they were stored in a humid basement for several years before I moved to a civilized climate. So, the magnesium housing is tarnished on the outside and the plating has deteriorated on a few of the levers and such. Pretty minor stuff from what I can see.
My question: is there is anything special I should do or check other than inspecting for corroded parts and normal setup as I prep these for service? |
72hardtop |
May 30 2019, 02:42 PM
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#2
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Member Group: Members Posts: 120 Joined: 11-September 13 From: Seattle/HB Ca./Fujieda-Japan Member No.: 16,378 Region Association: Pacific Northwest |
At your altitude stay with the 28mm vent size combined with 47.5 idle jets, 120 mains, 200 air corrector jets, F11 tubes, Float height 10-11mm (w/gasket in place ball NOT depressed), fuel pressure no more than 3.5psi, float drop 28-32mm
As for LM-2 readings.... LBI it by ear don't use LM-2 for adjusting. End result should be in the 13-14AFR range at idle. Timing should be at min 7BTDC at idle (28BTDC full at 3200rpms) vac hose off. WOT - 12.5:1 - low 13.2:1 or so Part throttle/cruise....16-17AFR Load = Throttle position A 16-17AFR at part throttle/cruise is cooler running than 13AFR at cruise. No lean tune tuning with centrifugal only distributor. Get an SVDA on it. |
porschetub |
Jun 1 2019, 12:24 AM
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#3
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Advanced Member Group: Members Posts: 4,697 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
At your altitude stay with the 28mm vent size combined with 47.5 idle jets, 120 mains, 200 air corrector jets, F11 tubes, Float height 10-11mm (w/gasket in place ball NOT depressed), fuel pressure no more than 3.5psi, float drop 28-32mm As for LM-2 readings.... LBI it by ear don't use LM-2 for adjusting. End result should be in the 13-14AFR range at idle. Timing should be at min 7BTDC at idle (28BTDC full at 3200rpms) vac hose off. WOT - 12.5:1 - low 13.2:1 or so Part throttle/cruise....16-17AFR Load = Throttle position A 16-17AFR at part throttle/cruise is cooler running than 13AFR at cruise. No lean tune tuning with centrifugal only distributor. Get an SVDA on it. Very sound advice,the whole issue with the 09 is it advances to fast,these and the old 010's were basically made to work on industrial engines that required a fast advance when responding to a governor,and yes they made T4 industrial motors . Fitted to a car engine this advance is just ok but causes somewhat of a "stumble'' as the advance is a little too much for the vacuum getting to the carb /carbs. The Bosch original so called SVDA provided a slower increase in early advance from the vacuum side to the max set point of movement on the advance plate the mechanical side takes over till total advance is reached,so this all equals a smoother throttle response which tends to match better with carbs. I have an original SVDA and a chinese knock-off, IMO the copy is pretty well made but will NEVER last as long as the Bosch,wee tip is to replace with Bosch the cap and rotor as not sure how good those parts are on the chinese unit. On a fairly stock motor tuned well you will be fine ,rant over good luck. |
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