Carburetor air leak?
Forum rules
If you need help logging in, or have question about how something works, use the Support forum located here Support Forum
Complete set of Forum Rules Forum Rules
If you need help logging in, or have question about how something works, use the Support forum located here Support Forum
Complete set of Forum Rules Forum Rules
-
Steve Jelf
Topic author - Posts: 6496
- Joined: Fri Jan 04, 2019 9:37 pm
- First Name: Steve
- Last Name: Jelf
- * REQUIRED* Type and Year of Model Ts owned: 1923 touring and a few projects
- Location: Parkerfield, Kansas
- MTFCA Number: 16175
- MTFCI Number: 14758
- Board Member Since: 2007
- Contact:
Carburetor air leak?
I think I know the answer to this, but I'll see if anybody confirms my suspicion. What is the likely effect of air leaking in around a worn throttle shaft? The carb in question is a standard NH, but I expect this applies to any similar carburetor.
The inevitable often happens.
1915 Runabout
1923 Touring
1915 Runabout
1923 Touring
-
Ruxstel24
- Posts: 2345
- Joined: Sun Jan 06, 2019 11:25 am
- First Name: Dave
- Last Name: Hanlon
- * REQUIRED* Type and Year of Model Ts owned: 24 Touring car
- Location: NE Ohio
- MTFCA Number: 50191
- Board Member Since: 2018
Re: Carburetor air leak?
Usually just a lean idle, or if really loose, idle may be too high. If you richen enough to idle good, probably too rich off idle...
-
Scott_Conger
- Posts: 6435
- Joined: Sun Jan 06, 2019 11:18 am
- First Name: Scott
- Last Name: Conger
- * REQUIRED* Type and Year of Model Ts owned: '13, '15, '19, '23
- Location: Clark, WY
- Board Member Since: 2005
Re: Carburetor air leak?
Dave
I agree with you and will add that generally, the idle will bounce around high/low every time the throttle is closed
I agree with you and will add that generally, the idle will bounce around high/low every time the throttle is closed
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
-
Gonenorth
- Posts: 130
- Joined: Tue Jan 08, 2019 6:04 pm
- First Name: Kevin
- Last Name: Whelihan
- Location: Danbury, WI
- MTFCA Number: 30688
- Board Member Since: 2008
Re: Carburetor air leak?
Had that problem as well until I had Russ Potter rebuild my NH. Trying to get a good consistent idle was constant challenge. Set it, idled OK. Drive down the road and stop...idle off and car runs rough. Also seemed like I was always adjusting the mix while driving as well. Under light throttle it had to be leaned, under full throttle it had to be enriched. Extremely annoying. After the Potter magic, the car has run beautifully. Idle stays consistent and under most throttle conditions (except for cold starts), I never need to adjust it. Some of the best money I've spent on my car. And yes, it had a worn shaft and mixture screw.