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| | | | Joined: May 2005 Posts: 25 New Guy | | New Guy Joined: May 2005 Posts: 25 | After several carb rebuilds, replacements, tune-ups, part replacements, and adjustments, the rebuilt 1954 chevy 235 in my 46 Chevy one ton truck still ran rich. After reading numerous posts and articles, I replaced the carb and original ignition as follows.
Carb is a 1977 factory rebuilt Rochester carb for a 250 inline chevy 6 (ebay-$46). Flange and linkage worked with minimal adjustments. Auto choke removed to permit use of manual choke. No more rich running.
Distributor is an aftermarket HEI unit with integral coil manufactured for this series engine (ebay $125). The unit bolted right up with no alterations needed. Wires were replaced.
Engine fires up instantly, runs much smoother, quieter, with improved fuel economy.
One of the simplest alterations I have performed.Don't know why I waited so long. | | | | | Joined: Feb 2007 Posts: 385 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2007 Posts: 385 | Did you try a fuel pressure regulator before the carb swap? As I understand it, late model fuel pumps are carried as replacements for the earlier ones and have a significantly higher fuel pressure. Late model carbs can handle it. Early years can't. It's just the kind of information that wouldn't be available, and I wondering because my original 1954 carb runs rich since I installed a new fuel pump.
195? Chevy 3800 dump truck
1973 Chevy C30 cab and chassis
1987 Suburban 3/4 ton 6.2L Diesel
| | | | | Joined: Sep 2005 Posts: 1,028 'Bolter | | 'Bolter Joined: Sep 2005 Posts: 1,028 | My 53 runs very rich. As far as I can tell has the original carb and fuel pump.
I rebuilt the carb but the inside of the exhaust pipe is still a black, damp mess.
I would like to try a new carb but I was not sure what to put on.
Do you think the new distributor did anything for the richness or just the smooth running?
| | | | | Joined: Feb 2001 Posts: 4,095 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 4,095 | the old rule of the tailpipe color went out the window when they introduce unleaded. they run black. ron
Ron, The Computer Greek I love therefore I am.1954 3100 Chevy truckIn the Gallery 2017 Buick Encore See more pix1960 MGA Roadster Sold 7/18/2017
| | | | | Joined: Sep 2005 Posts: 1,028 'Bolter | | 'Bolter Joined: Sep 2005 Posts: 1,028 | The plugs are black carbon too, but dry
| | | | | Joined: Feb 2007 Posts: 385 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2007 Posts: 385 | I'll send you the pressure regulator I bought if you will try it out. I'm really curious about results and am out of Rochester B's. PM me your address if you are interested. Just put it in the line between fuel pump and carb. It's adjustable from 3 to 7 psig, I think.
195? Chevy 3800 dump truck
1973 Chevy C30 cab and chassis
1987 Suburban 3/4 ton 6.2L Diesel
| | | | | Joined: Sep 2005 Posts: 1,028 'Bolter | | 'Bolter Joined: Sep 2005 Posts: 1,028 | What should the fuel pressure be?
| | | | | Joined: Feb 2007 Posts: 385 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2007 Posts: 385 | As I understand it, it should be 3.3 psig for an original 195? Rochester B. Any higher would force the needle valve off the seat causing leaks and rich mixture.
I've had trouble getting information on this subject.
Last edited by starkweatherr; 09/16/2008 3:39 AM.
195? Chevy 3800 dump truck
1973 Chevy C30 cab and chassis
1987 Suburban 3/4 ton 6.2L Diesel
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