butterfly
 

The butterfly closes 'on a whim'. Driving, suddenly no more than 15 mph.

Thank you -

Re: butterfly
 

???

Re: butterfly
 

I'll second that motion. ???

Re: butterfly
 

Isn't there supposed to be a spring on the carb linkage that prevents that?

Re: butterfly
 

Plain ol' normal English spoken in relatively comprehensive sentences would go a long way toward alleviating all of this guessing and confusion. So what's the particular situation with a butterfly?

Coop

.

Re: butterfly
 

Choke plate?

Re: butterfly
 

tubman, coop, ford38v8, itslow I apologize for using the term 'butterfly'.
I thought that 'butterfly' was the common term for it. Up north in Wisconsin, t'was. Well. . . by my Father.

Coop: This is thee first time that I have had the car on a road; i.e., Wards tires 1913-1997
(new 17" tires will adorn the car before any road travel.
The mystery to me = lightly accelerate out the driveway, it chokes, then trying to accelerate down the street/road = chokes,jerks, chokes,jerks, chokes, jerks.
Fifteen mph is max speed; roll to the roadside, stop.

So remove the '33 steelwool-carb 'top'. Peer in and view the choke plate . . . jussst about tightly closed! No wonder! (We heard the loud air suction through the jussst-about-tightly-closed space while on the 15-mph-road. My poor little baby; pleading for air.

(since the experience, I've read-up on this prob, = warm engine temp governs the choke plate open. But I have never had this problem. Perplexed. what the . . .?
Thanks, All Four, for your high-sage - hmmm - request for clarity.

deuce roadster:'I've not seen a spring - or don't recollect ever seeing one . . . since 1960 - thanks for the question.

Re: butterfly
 

I hear '33, so that carb is outta my league. Detroit Lubricator, right?

Re: butterfly
 

The original Carb for a 33 is the single barrel Detroit Lubricator. The 34 had the two barrel Stromberg model 40. What year and Carburetor are you in reference to?

The choke plate should remain open if the choke knob on the dash is depressed. Can you post a photo of the drivers side of the Carb?

Re: butterfly
 

I'll post a pic tomorrow -thanks for the request. Yes, the choke plate is supposed to remain open when the choke knob is pushed to the dashboard. To choke(close) =Pull!

Re: butterfly
 

Yes, tomorrow. Thanks for the request

Re: butterfly
 

Should have asked for a photo of the passenger side of the Carb.

Re: butterfly
 

If the rubber grommet in the dash is worn out, it is not it is not holding the choke plate in the open position. Carburetor vacuum is probably pulling it closed. Is there a grommet in the dash that holds the choke rod?

Re: butterfly
 

Thank you, TJ! The grommet is worn-n-n-n terribly out! Thank you so much! Throttle grommet as well. I'll be buying the two.

Re: butterfly
 

I'll photo the sides, Terry. The back of the carb has two brass screws . . . for idling?

I'll try to do it today - @4:00 pm my California time -as my son's camera has a flash.
I'll get them to you, Terry, Thank you much!

Re: butterfly
 

Two idle mixture adjustment screws are usually for a Stromberg. If the Model 40 or the Model 48 there is a spring washer under the choke linkage retaining shouldered screw head, it helps hold the choke in position. If the Model 97 there is a small spring loaded plunger that rest into a small hole in the choke linkage just above the shouldered screw. The plunger holds the choke in the open position.
Below left is a photo of the 97 with the small hole above the screw. Right is the Model 40 without the hole but does have the unseen spring washer under the head of the choke linkage retaining screw.

Re: butterfly
 

Another possible problem is badly worn or improper motor mounts allowing the engine to move too much under acceleration.

Re: butterfly
 

Thanks, Terry, for that. I am trying to load a pic of the carb, but having difficulty.

Very small letters on the carb, readable for ants= "Lincoln V12 Zepher" on the carb.