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ODSS Bolters
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September 21-23
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HOT WASH!
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Jan 21st, 2020
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Joined: Sep 2001
Posts: 31,811
Bubba - Curmudgeon
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Dennis,
In case you have not seen the mind-bogglingly-simple technique for tuning timing & carburetor with a vacuum gauge, here is an abbreviated run-down.
1. Disconnect the rubber line from the vacuum wiper motor to the port/fitting/tube on the intake manifold (at the intake manifold).
2. Connect a rubber line/tube from the vacuum gauge to the vacuum fitting on the intake manifold.
3. Start the engine and warm it up.
4. Set the idle RPM to around 450-500 RPM (or, by ear, if do not have a tachometer).
5. Adjust the timing by rotating the distributor slowly in both directions, to obtain maximum vacuum. At max vacuum, tighten the bolt on the distributor.
6. Re-adjust the idle speed, if necessary.
7. Adjust the mixture screw on the carburetor to obtain maximum vacuum.
8. If you want to continue, repeat steps 4-7.
9. Disconnect the vacuum gauge hose at the manifold and quickly reconnect the vacuum hose to the wiper motor.
10. Go for a test ride.
Good luck.
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Joined: Mar 2010
Posts: 10,720
Renaissance Man
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Great post Tim!
I especially like step #8. A lot of people (me included) often forget to do that.
If your idle was on the high side after you reach maximum vacuum, the mechanical advance in the distributor could have begun to kick in, monkeying up the process. This could be the case for both mixture, and timing adjustments.
Carl
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Joined: Jan 2013
Posts: 1,474
'Bolter
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Tim, is it me or is it hard to find all your good tech advice on your web site? For example, your tuning steps above. Maybe you just put it all here?
Allen
Yeah, well, that's just like, you know , your opinion, man - The Dude
1948 Chevy 3600 - goal Original restoration, Current Stage 1 - Disassembly and getting body in primer
1954 GMC 3100 goal Hot Rod, Current Stage 1 - Get body in primer
1931 Ford Model A 5 window Coupe - Old Skool Hot Rod
1945 Ford 2N Tractor - Runs great
1964 Ford 2000 Tractor - Use it every week
1974 Stingray Corvette
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Joined: Jan 2002
Posts: 2,405
OP
'Bolter
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Thanks to all. Good advice. I took the timing light back and used my vacuum gauge.
Thanks Tim. As always
Dennis
-there is nothing stronger than the heart of a volunteer-
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Joined: Jun 2008
Posts: 1,769
'Bolter
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Where is the mixture screw on a Rochester B carb?
Chuck
1950 Chevy 1/2 ton (all original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod
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