loose carb air filter cannisters
- Henry Ramirez
- 356 Fan
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loose carb air filter cannisters
Hello everyone, 356 Carb Rescue did a great job on my 64C carb rebuild but my Knecht air filter cannisters are loose enough to spin even when I've cinched them down. They also seem to be riding on the body of the carbs and could start wearing a groove in them. Not least, when I remove them I can see some oilly black residue on the outside body of the carb which seems to be dripping from the cannister. Is something missing? Thanks, Henry
- Dirk Heinrich
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- Henry Ramirez
- 356 Fan
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- Location: Santa Cruz, CA
- Dirk Heinrich
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- Vic Skirmants
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- 356 Fan
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C air filter 'cans'
Going further; the O-ring fits into a lip inside the extended neck to seal the top of the Zenith carb.
Dick
Dick
- Henry Ramirez
- 356 Fan
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- Jim Fleming
- 356 Fan
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Loose air cleaners
Henry,
What I have done on all my air cleaner canisters to tighten them up is cut straps (shims) out of galvanized steel sheet to go between the housing base and clamp. The clamps get stretched and distorted over the years so they don't grip the carb top any more. Some strategically placed flat washers can help the clamp bolt work better also.
The later C air cleaner canisters are very desirable because they have the detail (with o-ring) that extends into the carb throat so the condensed fuel that collects inside the air cleaner element will drain down inside of the carb instead of all over the top of it making a mess. The only problem with these air cleaner canisters is that they are taller and don't fit in the engine compartment of Speedsters, D's and Roadsters.
For my 1959 D I fabricated funnels out of sheet steel (from tin cans) that I slide down in the air cleaner throat to divert condensed fuel into the carb. These funnels also trap a rubber seal that works like the C air cleaner seal.
What I have done on all my air cleaner canisters to tighten them up is cut straps (shims) out of galvanized steel sheet to go between the housing base and clamp. The clamps get stretched and distorted over the years so they don't grip the carb top any more. Some strategically placed flat washers can help the clamp bolt work better also.
The later C air cleaner canisters are very desirable because they have the detail (with o-ring) that extends into the carb throat so the condensed fuel that collects inside the air cleaner element will drain down inside of the carb instead of all over the top of it making a mess. The only problem with these air cleaner canisters is that they are taller and don't fit in the engine compartment of Speedsters, D's and Roadsters.
For my 1959 D I fabricated funnels out of sheet steel (from tin cans) that I slide down in the air cleaner throat to divert condensed fuel into the carb. These funnels also trap a rubber seal that works like the C air cleaner seal.
James H. Fleming
- Jim Fleming
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Zenith carb sealing funnels
By popular request here is a mod I did 35 years ago to my conv'D to clean up the carb tops. I don't want to hear a bunch of grumbling from the rocket science nit pickers about flow bench data and fit tolerances. This is just a shade tree mod that worked for me.
James H. Fleming
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O ring
anthony apcar
- Larry Coreth
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Jim,
Good drawing, even my drafting instructor from college would have approved. He was the one who threatened to flunk me if I didn't learn to letter properly ! With the advent of AutoCad this has become a lost art.
You are right it is doubtful that you will gain significant Hp from your “racing mod” but I would bet that it flows better than the original square step over the O ring ! I like it, simple, efficient, approaching elegant.
Good drawing, even my drafting instructor from college would have approved. He was the one who threatened to flunk me if I didn't learn to letter properly ! With the advent of AutoCad this has become a lost art.
You are right it is doubtful that you will gain significant Hp from your “racing mod” but I would bet that it flows better than the original square step over the O ring ! I like it, simple, efficient, approaching elegant.
Larry Coreth
Roanoake Rapids, NC
Roanoake Rapids, NC
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Re: loose carb air filter cannisters
Follow up question. Is there a source for the complete clamp to secure the filter housing on the carburetor?
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- 356 Fan
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Re: loose carb air filter cannisters
It's amazing how many Zenith air filter cans @ the recent Stoddard swap meet don't have the proper clamps w/them.
I've made them over the years w/the proper shape and hardware --including the square nut.
Screw clamps don't work and they nlook bad!
Dick
I've made them over the years w/the proper shape and hardware --including the square nut.
Screw clamps don't work and they nlook bad!
Dick
- John Brooks
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Re: loose carb air filter cannisters
Also I'd they are loose, they sit down on the carb top. This and vibrations will wear a groove in the left carburator top where the fuel line attaches. This will eventually lead to a non repairable fuel leak. If you are lucky.
John Brooks
62 Roadster
66 912
84 Cab
getting pushed around in porsches since 1965
62 Roadster
66 912
84 Cab
getting pushed around in porsches since 1965
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- 356 Fan
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Re: loose carb air filter cannisters
I've restored several carb top castings w/JB Weld; Also, I add/make special bronze threaded inserts to repair
the banjo bolt threads-- I don't use Helicoils. I have several repaired Zenith carb tops available for exchange.
Dick
the banjo bolt threads-- I don't use Helicoils. I have several repaired Zenith carb tops available for exchange.
Dick