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Author Topic:   Motorcraft 2100 carb?
dode
Member
posted September 22, 2003 02:15 PM
Can anyone tell me more about these things? Seems one showed up on our motor for the last race of the year. I know nothing about it. The engine guy put it on there, and he doesn't like to share details. I know it has a front mounted accelerator pump. It has no holley markings on it that I have found, so I am assuming that this is what the carb is. Car seemed to run ok with it on there, but it looks like it would be a pain in the **** to work on. Anyway, any insight would be nice. Thanks.

John

KPLugnut
Member
posted September 22, 2003 02:56 PM
We've built many in the past. They came off V8 Ford's, mostly. They have a Holley 2bbl bolt pattern on the base, they take a Holley power valve, and pump diaphram, but have different sized jets than a Holley (although conversions can be done).
They're not that complex, really, and until IMCA went to 7448 2bbls, many builders were using them on the IMCA stockcars.
Sounds "fishy" if your own engine builder won't teach you how to maintain and tune your motor....

Let me know if you need anything else.

KP


dode
Member
posted September 22, 2003 03:03 PM
How would such a carburator compare to say a 4412? I have know idea what has been done to this carb (2100). I know some grinding was done to the throttle shafts, but that is about all that I can "see" has been done.

John

KPLugnut
Member
posted September 22, 2003 03:42 PM
In stock form, most did not flow as much as a stock 4412, even with just the throttle shaft milled. Most builders used to REALLY massage the venturi area and booster assemblies which made them quite finicky carbs, but they certainly flowed a lot more.
My current opinion is it's a whole lot easier to go with a 4412 (even a worked over one) and still get good tunability and performance. That is, if it's allowed in your class.
The Motorcrafts weren't designed for performance use, and have small floats, small fuel inlets, sticky needle/seats, and several other things that just don't cut it in circle track racing.
And the stock jets aren't available to my knowledge so guys were drilling their own or trying to install Holley jets in there (not easy).

So unless you HAVE to run that carb, I'd question why it's on the car.
And tell your engine builder if he wants a BOX full of Motorcraft/Autolite 2bbls, I'll ship him one for the cost of shipping. I have been storing them for years here... :-)

Hope that helps,
KP


dode
Member
posted September 22, 2003 03:46 PM
Ha ha ha...nope, we don't have to run it. Heck, it isn't even legal. I am not sure what his thing is, but he's not the brightest bulb in the box. I'm really hoping that once our rules are set for next year that I can convince the man with the checkbook to let me order a carb from you . Thanks a bunch!

John

stockcar5
Member
posted September 23, 2003 12:24 PM
i have one of these that just over 700cfm. its been worked over nicely. we still have tracks here that run the "old" imca rules. but now they let us run modified holley 2bbls. i have a c&s 890 2bbl and its MUCH better. go with a modifed holley if you can.

luke

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