I'm the proud new owner of a 1911 T touring that's equipped with the correct holley carb. I'm having difficulty getting it to start when cold. I've owned a few T's with later carbs that haven't had this issue.
My question is this - cast into the venturi is an weighted air valve that I assume opens at higher rpm. Is there supposed to be a spring helping keep the valve closed during cranking? The car will start if it's towed and it starts and runs quite well when warm. When hand cranking cold the spark plugs are dry. I'm thinking that the air valve may be opening letting air in but or course no fuel. I've opened the mixture screw a number of turns but no change.
I've been looking everywhere, however, other than some pictures there isn't a lot of information on this particular carb that I can find.
Any and all input would be appreciated
1911 Holley 4500 carburetor
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Scott_Conger
- Posts: 6834
- Joined: Sun Jan 06, 2019 11:18 am
- First Name: Scott
- Last Name: Conger
- * REQUIRED* Type and Year of Model Ts owned: 1919
- Location: not near anywhere, WY
- Board Member Since: 2005
Re: 1911 Holley 4500 carburetor
You may very well have the fuel level too low in the bowl.
Scott Conger
Tyranny under the guise of law is still Tyranny
NH Full Flow Float Valves™
Obsolete carburetor parts manufactured
Tyranny under the guise of law is still Tyranny
NH Full Flow Float Valves™
Obsolete carburetor parts manufactured
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Jamie H
Topic author - Posts: 4
- Joined: Thu Feb 07, 2019 9:08 pm
- First Name: Jamie
- Last Name: Holmes
- * REQUIRED* Type and Year of Model Ts owned: 1915 Runabout
- Location: Ontario, Canada
- Board Member Since: 2013
Re: 1911 Holley 4500 carburetor
I thought that as well, however, I've adjusted the float height so its just on the verge of flooding with no change. I had my neighbor put his hand on the carb inlet while I gave it a couple of pulls and he said that there was virtually no vacuum produced. Tried it again with the carb off and said there was lots of vacuum
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rickd
- Posts: 507
- Joined: Sun Jan 06, 2019 12:56 pm
- First Name: Rick
- Last Name: Duquette
- * REQUIRED* Type and Year of Model Ts owned: 1913 Touring, 1914 Touring(2), 1925 Touring, 1927 PU, 1955 T Bird, 69 Shelby GT 350
- Location: Grand Forks, ND
- Board Member Since: 2015
Re: 1911 Holley 4500 carburetor
Maybe its not the carb. You say it runs well when warmed up; maybe leaking manifolds downstream of the carb. Is your ignition system in good shape? The old adage, 90% of carburetor problems are electrical.
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RGould1910
- Posts: 1246
- Joined: Tue Jan 22, 2019 8:16 am
- First Name: Richard
- Last Name: Gould
- * REQUIRED* Type and Year of Model Ts owned: 1910 touring, 1912 roadster , 1927 roadster
- Location: Folsom, CA
Re: 1911 Holley 4500 carburetor
I've run an 11 Holley carb for a few years. They can be difficult to start. Flood the bowl for 3 seconds. Crank it 5 times with the ignition off. Turn the ignition on and cank.
A problem I had at first was the tickler was not lowering the float enuf to flood it. Once I realizes the problem, I unscrewed the cap over the needle and flooded the carb by lifting the arm and lowering the float.
Frankly I like them better than Kinngston 5 balls
There is no spring. Just the weight over the air valve
A problem I had at first was the tickler was not lowering the float enuf to flood it. Once I realizes the problem, I unscrewed the cap over the needle and flooded the carb by lifting the arm and lowering the float.
Frankly I like them better than Kinngston 5 balls
There is no spring. Just the weight over the air valve
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Jamie H
Topic author - Posts: 4
- Joined: Thu Feb 07, 2019 9:08 pm
- First Name: Jamie
- Last Name: Holmes
- * REQUIRED* Type and Year of Model Ts owned: 1915 Runabout
- Location: Ontario, Canada
- Board Member Since: 2013
Re: 1911 Holley 4500 carburetor
Thanks. I played some more today to no avail. I pulled a Kingston 5 ball off Brush and after richening the mixture a few turns it fired right up. I pulled the NH off of my 27 T and it also fires up after a couple of pulls.
Thanks for the advice on the spring. I was pretty sure there wasn't supposed to be one.
I have flooded the carb until there was a steady stream of gas running out the bottom but no joy.
I pulled a Stromberg OF out that I bought years ago for a 15 T that Ii had but the NH worked so well I never bothered with it. It's been given a bath and will go on the car tomorrow if I have time.
I'll report back
Thanks for the advice on the spring. I was pretty sure there wasn't supposed to be one.
I have flooded the carb until there was a steady stream of gas running out the bottom but no joy.
I pulled a Stromberg OF out that I bought years ago for a 15 T that Ii had but the NH worked so well I never bothered with it. It's been given a bath and will go on the car tomorrow if I have time.
I'll report back