Re: The Duchess Project: 1940 Super 8 Convertible Sedan
Posted by Joe Santana On 2013/5/9 10:22:44
SKIP TO BOTTOM TO SEE MY QUESTIONS.
I wanted to drive the Duchess over the coast range last weekend, but left her home because of the lousy performance under power stress. I didn't think it would be fun trying to get over those long hill climbs.
The shop had told me the carburetor "pump", the performance part, was the problem, so last night I looked up Stromberg carburetors in my Motor Manual.
The manual divided up the carburetor into different segments, with different parts associated with each segment such as Idle, Performance. The float level is mentioned a lot in diagnosing carburetors, but I didn't bother with it (didn't want to screw it up) because it's associated with idling and I don't have any problem with starting or idling.
I decided to remove the carburetor and have a look. I had left-over parts from previous rebuilds, if something was obviously broken.
I found that the leather on the piston that allows more fuel into the chamber was torn. I transferred the springs and retainer to an old, but ok, one and replaced it.
The performance was noticeably better on my drive to the gas station at 10pm with the top down, but on the way back, after the engine had warmed to normal (straight up), sat at the station, and restarted, there was still some "fluffing" like insufficient fuel going up my hill.
FUEL LEVEL CHECK
I'm going to check the fuel level during idle. I've never done this before. I'm supposed to start the car with the "horn" (the air cleaner?) on to prevent fire from potential backfires, then remove the fuel level plug of the Stromberg AAV-26 and ? Hope to see fuel coming out? See the bottom of the float? See the fuel at the bottom of that hole? (It never says.)
These are my questions:
What should I see while the engine is idling?
Should I pull back on the throttle and rev the engine doing this?
Should I see something different when I rev it?
If that doesn't look right, I'm going to open it up again tonight (usually takes me 4 times to get it right, as some may know) and adjust the floats.
Attach file:
(11.76 KB)
I wanted to drive the Duchess over the coast range last weekend, but left her home because of the lousy performance under power stress. I didn't think it would be fun trying to get over those long hill climbs.
The shop had told me the carburetor "pump", the performance part, was the problem, so last night I looked up Stromberg carburetors in my Motor Manual.
The manual divided up the carburetor into different segments, with different parts associated with each segment such as Idle, Performance. The float level is mentioned a lot in diagnosing carburetors, but I didn't bother with it (didn't want to screw it up) because it's associated with idling and I don't have any problem with starting or idling.
I decided to remove the carburetor and have a look. I had left-over parts from previous rebuilds, if something was obviously broken.
I found that the leather on the piston that allows more fuel into the chamber was torn. I transferred the springs and retainer to an old, but ok, one and replaced it.
The performance was noticeably better on my drive to the gas station at 10pm with the top down, but on the way back, after the engine had warmed to normal (straight up), sat at the station, and restarted, there was still some "fluffing" like insufficient fuel going up my hill.
FUEL LEVEL CHECK
I'm going to check the fuel level during idle. I've never done this before. I'm supposed to start the car with the "horn" (the air cleaner?) on to prevent fire from potential backfires, then remove the fuel level plug of the Stromberg AAV-26 and ? Hope to see fuel coming out? See the bottom of the float? See the fuel at the bottom of that hole? (It never says.)
These are my questions:
What should I see while the engine is idling?
Should I pull back on the throttle and rev the engine doing this?
Should I see something different when I rev it?
If that doesn't look right, I'm going to open it up again tonight (usually takes me 4 times to get it right, as some may know) and adjust the floats.
Attach file:
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