Can someone explain to me how the fuel mixture works on a 26 T? I don’t really understand how to adjust it for starting and also normal driving. How do I adjust it to start when it is cold out as well? Are there any good resources for learning how a T carburetor functions? Thank you!
Novice choke question - 26 T roadster
- Thread starter KCW
- Start date
stevests
Well-known member
The '26 - '27 T should have a combination mixture/choke rod - to start from scratch, turn the knob in (c.w.) until you fell the needle seat - do not turn down hard ! Turn knob out
(c.c.w.) approx. 1 & 1/2 turns out - that should get you started. After engine warms up near operating temperature, begin closing knob until the engine begins a slight stumble - open ever so slightly until it smooths out. For a quick lean condition test, merely give the throttle a quick open jab - if it coughs or stumbles, you're too lean - richen it up a smidge.
(c.c.w.) approx. 1 & 1/2 turns out - that should get you started. After engine warms up near operating temperature, begin closing knob until the engine begins a slight stumble - open ever so slightly until it smooths out. For a quick lean condition test, merely give the throttle a quick open jab - if it coughs or stumbles, you're too lean - richen it up a smidge.
rotorwrench
Well-known member
Some of the late model Ts that came with the vaporizer fuel system get converted to the earlier carburetors with the conventional intake manifold. The owners manuals have good information about operational function such as adjustment of the mixture valve and basic starting & operating instructions. Everything is manually operated on the old flivers but once a person gets the hang of it, it becomes second nature.
39portlander
Well-known member
"rich-roll" "lean-stumble" right in between that 1 & 1/2 turns out should be right there. Good luck and if you have an NH there are some nice kits with the better hardened/larger needle/seats, Scott Conger on the MTFCA was selling those a few years ago.
Thank you everyone. If I continue to rotate far enough Counterclockwise to open will I eventually rotate it far enough that it will be closed again? Or will it stop when fully open? Same think for clockwise - if I rotate it far enough past “closed and lean” will it eventually be open again or will it hit a stop? Sorry for the rookie questions! I appreciate everyone’s response. Thank you!
rotorwrench
Well-known member
The needle should stop against the valve seat to close off mixture fuel. As stevests mentioned, don't apply too much torque to that valve upon feeling the stop of turning motion. It is your starting point to open the valve only. It's not a fuel shut off such as is generally on the fuel tank outlet. If it gets enough fuel to run in the off position then the seat damage is already done.
I'm still rather curious if your engine still has the long carburetor intake assembly that is joined to the exhaust manifold to get the heat for vaporization and is known as the vaporizer due to that. These units are known to sometimes having difficulty on cold starts. They can be finicky little buggers but some folks have decent luck with them. To keep a car original in that late model T time frame, there are still plenty of folks running them. The MTFC forum has a lot of information and it can be searched on Google to find some information.
I'm still rather curious if your engine still has the long carburetor intake assembly that is joined to the exhaust manifold to get the heat for vaporization and is known as the vaporizer due to that. These units are known to sometimes having difficulty on cold starts. They can be finicky little buggers but some folks have decent luck with them. To keep a car original in that late model T time frame, there are still plenty of folks running them. The MTFC forum has a lot of information and it can be searched on Google to find some information.