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#503511 - 04/19/08 01:25 PM
Marvel carb.
[Re: Taco]
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Taco
Member
Registered: 09/11/07
Posts: 78
Loc: Netherlands
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Finaly the work is done. BUT......
when i have the flapper-valve in the good position (just closing) and the engine is running, the mixture is too rich. Black smoke, and a terrible smell in the barn.
To get the engine running in a proper way, i had to turn the brass-piece a lot back.
See pic.
Now what??
Taco.
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#503659 - 04/20/08 08:25 AM
Re: Marvel carb.
[Re: Taco]
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carbking
Member
Registered: 11/26/04
Posts: 523
Loc: MO
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Fred - we never broke one, but have not rebuilt any Marvels in a few years.
Taco - there are MANY different air valve springs for Marvels, the one pictured by Mark is one of the more common. What year is your Buick? Also, did you try adjusting the fuel adjustment on the bottom of the carburetor as well as the knurled knob? Fuel pressure can also cause the black smoke. The Marvel doesn't like electric fuel pumps. About 1 pound pressure is all the early ones are going to accept.
Jon.
_________________________
Good carburetion is fuelish hot air!
Owner - The Carburetor Shop LLC (of Missouri)
The most expensive carburetor you will ever buy....is the wrong one for the application that you attempt to modify!
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#503883 - 04/21/08 02:38 AM
Re: Marvel carb.
[Re: carbking]
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Taco
Member
Registered: 09/11/07
Posts: 78
Loc: Netherlands
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Carbking: my Buick is from 1928. This one:
It's a master. Then this must be the 'T 4' as the reverence book says.
I turned the fuel adjustment 1 1/2 turn open, the mark of the wheel is at the point where the brass pin is.
At this time the engine runs fine.(i think)(no more black smoke)But with the 'old' spring, the knurled knob is turn out a lot.
I do not know what pressure my electric fuel pump gives.
I removed the top of the float chamber. I could see that the fuel is stopped when the chamber is full. The level of the fuel is not too high i think. (not overfloating)
I have a spare one carb. I had a look at it, and the spring in it is the same as in the pic above. Not seen before.
I will chanche the spring and will see what happens.
Do you think that spring is the right one?
Taco.
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#503889 - 04/21/08 07:28 AM
Re: Marvel carb.
[Re: Taco]
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carbking
Member
Registered: 11/26/04
Posts: 523
Loc: MO
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Taco - there are several springs that all have much the same shape, but different tension due to different wire size. The spring pictured is of the correct shape for your carburetor. Free length of the spring is 1.5 inches (about 38 mm).
Very pretty car!
The electric pump may be your culprit! But try the spring from the spare carb.
Jon.
_________________________
Good carburetion is fuelish hot air!
Owner - The Carburetor Shop LLC (of Missouri)
The most expensive carburetor you will ever buy....is the wrong one for the application that you attempt to modify!
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#503969 - 04/21/08 12:35 PM
Re: Marvel carb.
[Re: carbking]
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Taco
Member
Registered: 09/11/07
Posts: 78
Loc: Netherlands
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I made a pic of the spring that was used in the carb.
It seems to me that someone pulled it out in the middle......
Taco.
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#503998 - 04/21/08 01:42 PM
Re: Marvel carb.
[Re: Taco]
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Mark Shaw
Member
Registered: 06/08/05
Posts: 915
Loc: Vancouver, WA
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Exactly!
_________________________
Mark Shaw
BCA PWD Director
HCCA Member (Skagit & Portland)
1913 Model 31 Touring
1915 Model C-25 "Speedster"
1924 Model 45 "Roadster Truck"
1929 Model 29-27 Sedan (Now my son's car)
1931 Model 57 Sedan
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#504107 - 04/21/08 08:20 PM
Re: Marvel carb.
[Re: Taco]
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carbking
Member
Registered: 11/26/04
Posts: 523
Loc: MO
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I made a pic of the spring that was used in the carb. It seems to me that someone pulled it out in the middle...... Taco.
Dr. Goodpliers strikes again!!!
_________________________
Good carburetion is fuelish hot air!
Owner - The Carburetor Shop LLC (of Missouri)
The most expensive carburetor you will ever buy....is the wrong one for the application that you attempt to modify!
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Top
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#504144 - 04/21/08 10:42 PM
Re: Marvel carb.
[Re: Taco]
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Mark Shaw
Member
Registered: 06/08/05
Posts: 915
Loc: Vancouver, WA
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The Standards had black headlight buckets & the Masters had plated buckets in 1929. That is how I identified the right parts at swap meets for my car (now my son's car).
My reference book says the 1928 Standard series had new bullet shaped painted headlights except for models 24 & 25 which were nickel plated. It also states that all Master Sixes had chromed headlight shells.
_________________________
Mark Shaw
BCA PWD Director
HCCA Member (Skagit & Portland)
1913 Model 31 Touring
1915 Model C-25 "Speedster"
1924 Model 45 "Roadster Truck"
1929 Model 29-27 Sedan (Now my son's car)
1931 Model 57 Sedan
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#504197 - 04/22/08 02:19 AM
Re: Marvel carb.
[Re: Mark Shaw]
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Taco
Member
Registered: 09/11/07
Posts: 78
Loc: Netherlands
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My car is the 128" wheel base type 58, a 5 passenger coupe as fas as a i know.
And why the headlamps are painted black? I don't know. It's how i bought the car. The car is still original, apart from the paint. That's made new, but when? The car isn't restored, but the engine has several new parts.
I have a flat tyre, new tubes are ordered in the USA,and i have to wait for them making the flat tyre.
Later this week or next week i will test the new spring in the carb.
Taco.
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#504246 - 04/22/08 09:45 AM
Re: Marvel carb.
[Re: Taco]
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Mark Shaw
Member
Registered: 06/08/05
Posts: 915
Loc: Vancouver, WA
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The car looks great either way. My guess is that a previous owner did not want to spend the $$ to nickel plate the headlight buckets & just painted them.
_________________________
Mark Shaw
BCA PWD Director
HCCA Member (Skagit & Portland)
1913 Model 31 Touring
1915 Model C-25 "Speedster"
1924 Model 45 "Roadster Truck"
1929 Model 29-27 Sedan (Now my son's car)
1931 Model 57 Sedan
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