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Ok, Stupid question time.

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MattP

MattP

Jedi Knight
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The only other manual choke I have owned was my 67 Chevy PU years ago. The question I have, is should I be needing the choke after it has sat for only a couple of hours? On the 283 V8 once I had warmed it up for the day, I didn't need it again. But running around the other day in the MG, every time I started out if it sat for more than an hour or so, it would sputter if I didn't pull the choke. Is it just a difference in the thermal mass, or something more sinister?
 
If the car is properly tuned the answer is no. I would start with you distrib, starting with the gap. Ih the dizzy is producing a good sprk then start looking at your carbs. I am sure others can provide much more and better detail, and some will want to start with rour carbs.
 
Likely a combination of thermal mass & different mixture settings. I think if everything is setup optimum, the choke should need to be used after a couple of hours. The MG might be set a little on the lean side. Especially since emissions were becoming a big factor when your MG was built.

Not sure what ignition has to do with choke except a lean mixture would be harder to ignite. Back to emission calibrated engines again?
D
 
I bet the tuning is an issue. Over the past couple of days I have noticed a marked increase in the sputtering, even on full choke. I have a four day coming up this weekend, weather permitting, I fiddle a bit and see if I can brake it the rest of the way.
 
Dave, Banjo has a quote that I believe in: 90% of carburetion problems are in the ignition. I start on that side of the equation because it usally saves me time. /ubbthreads/images/graemlins/cheers.gif
 
[ QUOTE ]
Dave, Banjo has a quote that I believe in: 90% of carburetion problems are in the ignition. I start on that side of the equation because it usally saves me time. /ubbthreads/images/graemlins/cheers.gif

[/ QUOTE ]

That's what I have found to be the case over the last 40 or so years. I learned the hard way to leave the carburator adjustments alone until I checked out the ignition.
My carbs are HIF-4's and I never have to use the chock in the summer unless it has been sitting for a few weeks. I run them a little tad on the rich side. Seems to run much better that way. The HIF-4 has a bimetal in carb that changes the mixture with changes in temperature. This might be why I don't have to use the chock much.
Bob
 
Same thing here don't need the choke excepts ealier in morning afgter a cold night.
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