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-   -   Old-style MC2100 automatic choke question (https://forums.off-road.com/jeep-short-wheelbase/203630-old-style-mc2100-automatic-choke-question.html)

MarineOpLaw 01-15-2005 09:42 PM

Old-style MC2100 automatic choke question
 
<font color="red">Alrighty... FINALLY!</font> got my Scrambler - that I swapped engines (258->258) & converted to auto tranny (T-5 -> TF999) - up-n-running. (Took 'bout a year... w/ many big, higher-priority projects interrupting/delaying completion.) FWIW, converting to AT was in deference to my wife...[img]images/graemlins/owned1.gif[/img] now she can drive one of the many in our Rupert fleet... (and thus makes future acquisitions more palatable [img]images/graemlins/blush.gif[/img] [img]images/graemlins/grin.gif[/img] ).

The 'new' engine also got an MC2100 upgrade. [img]images/graemlins/thumbsup.gif[/img] (Fabbing kickdown linkage was a big time-consumer, but the end product looks clean and realtively stock... therefore seemingly worth the effort.)

Unfortunately, I did not pay very close attention to the MC2100 I picked up off eBay...:o it must be an fairly ancient one...[img]images/graemlins/wall.gif[/img] - not having the PVC outlet on the rear, nor the port on the left front of the carb.:( ('Fixed' the former challenge by fabbing a port w/ barb fitting screwed into a hole drilled in the carb adapter; and the latter by punching out a plug on the right front and press fitting a tube donated by 'parts BBD'. [img]images/graemlins/grin.gif[/img] Time consuming, but effective. [img]images/graemlins/headspin.gif[/img] )

Final challenge is the automatic choke: it's not electrically-operated, but rather the type that connects to a heat tube coming up from manifold. Trouble is, the manifold is NOT so ancient and does not have any holes for a little heat tube.

Sooo..., can I simply drill a hole in the exhaust manifold... or ain't it that easy to do? [img]images/graemlins/confused.gif[/img] Are a few metal shavings in the exhaust manifold an issue?

Or, am I just better off swapping on an electric choke? Can I adapt one from a BBD [img]images/graemlins/confused.gif[/img] (plenty of them laying around the garage... [img]images/graemlins/tongue.gif[/img])

Many thanks aforehand...

knifeboy2 01-15-2005 10:04 PM

Re: Old-style MC2100 automatic choke question
 
I'm pretty sure you can pick up an electric choke from Autozone or the similar for around $30 or less. I've never swapped one out but looking at my carb I can't imagine its very hard to swap chokes.

OlllllllOCJ 01-15-2005 10:27 PM

Re: Old-style MC2100 automatic choke question
 
[ QUOTE ]
converting to AT was in deference to my wife...

[/ QUOTE ]

I can understand that one completely. Much to the dismay of both my children... Grumpy (my Scrambler) is an automatic. While it may be a seldom and rare occasion... the wife will drive it making it priceless in certain conditions.

[img]images/graemlins/applause.gif[/img] Always good to know that another Scrambler is becoming road worthy. [img]images/graemlins/applause.gif[/img]

[ QUOTE ]
The 'new' engine also got an MC2100 upgrade.

[/ QUOTE ]

Guess that I'm already on record as not a fan of the MC2100. But it is a simple carb that is likely better suited for a 258 than all those 304s that they came on. So rock on [img]images/graemlins/gituar.gif[/img]

[ QUOTE ]
Or, am I just better off swapping on an electric choke? Can I adapt one from a BBD

[/ QUOTE ]

That sounds like the trick to me.

I have a collection of junk carbs, just a few, and will give that idea a review. Surely there is a way, if I hit on something will post it up.

Dale

MarineOpLaw 01-15-2005 10:48 PM

Re: Old-style MC2100 automatic choke question
 
[ QUOTE ]
Guess that I'm already on record as not a fan of the MC2100. But it is a simple carb that is likely better suited for a 258 than all those 304s that they came on. So rock on [img]images/graemlins/gituar.gif[/img]
Dale

[/ QUOTE ]

I'm thinking the 2100 is just going to be an interim solution until I get relocated, properly set-up in a real shop (as opposed to my driveway [img]images/graemlins/bag.gif[/img] ) and organized... [img]images/graemlins/codger.gif[/img] Then, I believe I'll delve into installing a 4.0L HO head w/ the EFI. (Which is why I did not go out and buy a 'new' MC2100 today when I realized the shortfalls of the 2100 I mod'd today...)

For now, we'll make-do w/ the MC2100.

RRich 01-15-2005 11:36 PM

Re: Old-style MC2100 automatic choke question
 
If you drill into the ex manfold and run it to the carb you'll have EGR - not desirable.
Notice the small holes you've seen on exhaust manifolds do not go into the exhaust stream. There's a big blind cavity in the manifold - called a choke stove - it heats air, then the carb sucks a little up into the carb for heating the choke coil.

You can make your own choke stove - simply wrap a length of tube around the exhaust manifold or even the exhaust pipe underneath where it won't show - and will gather heat. Leave one end slightly open - a tiny hole, hook the other end to the carb. You need a slight draft to get the hot air to flow - that's why the tiny hole.

muddave 01-16-2005 05:34 AM

Re: Old-style MC2100 automatic choke question
 
I would like to here how you did the Kickdown linkage and pics if you can. I am getting ready to do the same. Any heads up would be great. David

Caver Dave 01-16-2005 09:15 AM

Re: Old-style MC2100 automatic choke question
 
FWIW, my 2100 (stock) didn't have the PCV fitting and the adapter is drilled/tapped like you described (also stock)...so I'd say no probs there.

Also, the electric choke swap is pretty simple (it looks like and fits into the same socket the thermal does....just need a 12V source...many are already wired) or skip it and go "total control"...*manual* (about $10 from AutoZoo)

greyj 01-16-2005 09:20 AM

Re: Old-style MC2100 automatic choke question
 
is there a reason not to go with a manual choke? i'm not sure what virginia winters are like, but over the past few months i've found the manual choke was the best thing i did to my 2100...

John_Strenk 01-16-2005 09:41 AM

Re: Old-style MC2100 automatic choke question
 
One thing I found out last week end was the MC2100 electric choke move in the opposite direction a Carter Carb moved so you might just want to double check the motion of the spring.

ALso have you thought about how your going to hook up the electric wiring? Do you want to add more electrical load onto your ignition switch or run it into a oil pressure switch.??

lomodyj 01-16-2005 11:43 AM

Re: Old-style MC2100 automatic choke question
 


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