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Since I had not had the time to make the TBI swap in ol red, I took the Hillbilly Bug to Rush Springs last weekend. https://www.rushspringsranch.com/ It worked out great and ran like a champ. So well did the Motorcraft 2bbl run I decided to take the nose low problem-matic Edelbrock 4bbl off the red Bronco and swap on a MC2bbl.
FYI the cheap Mr Gasket 2bbl to 4bbl adapter will give you a giant vacuum leak on the back side due to its design. I solved by adding a free Ford EGR plate in between, yea its stacked like a Big Mac, but it runs way better and I did it for cheap.
I've sure liked the Motorcraft 2 bbl I put on my Bronco too. Ordered it from an internet junkyard, cleaned it, out a rebuild kit in it and ran it. I've never had any trouble with it. Even the plug color seems good, so the mixture was pretty much right on as I got it.
I am looking in to a MC2150... the side markings can be a 1.08 venturi that is a 287 CMF, and or a 1.21 venturi that is a 351 CMF. or I have a lead on a Holley 500 2BBL from a local race car carb guru. He said he can tune/mod it for crawling?? We shall see what route I go after this up coming outing with the old red Bronco and if it stays reliable with the current set up.
A user opinions on the Holley 500? Or mod tricks to the 2100 to help in off road situations?
I don't know anything about the Holley 2 bbl. I had a 4 bbl 4150 or 4160 (I forget which) on my old CJ5. That sucked off road until I made a few changes to it. I guess the Holley truck avenger (also a 4 bbl) was supposed to be good off road right out of the box. So i could imagine that the 2 bbl you are talking about might be OK, or at least could be made OK. But I don't know.
The 2100 seems to be pretty great for off road right out of the box (or junk yard, as the case may be). I haven't done anything to mine and it has never stumbled on me. And the one I had in my '85 F-250 also never gave any issues the few times I took that truck off road.
Post #2by CZLN6 » Mon Apr 02, 2018 12:43 pm
Howdy:
You might suggest that he do a google search for Autolite 2100. There is lots of good info on the web. Annular discharge booster is the little donut like ring that hangs above the venturi, or the narrow part of the carb throat. The annular booster has outlet holes all around the inside of the donut. Other carbs have a singular hole in the booster. The many smaller holes ingest a finer spray of gas into the air stream, causing the gas to vaporize more quickly as it enters the intake. Annular discharge boosters can show an improvement in idle and off idle acceleration.
The 2100s can use a Holley power valve to fine tune WOT air/fuel ratio on acceleration.
Autolite 2100s are lighter that Holley 2300s and most Carter and Rochester 2 barrel carbs. They are the easiest carb, ever, to rebuild. The 2100s have no bowl gasket lines below the level of the fuel. They are better bowl vented than most carbs.
But the trade off is that they cannot be fine tuned, internally, as easily as a Holley 2300. Main jets are harder to come by where as Holley parts are available at most part stores. One tip I saw at a truggy (truck+buggy) rally was adding a rubber hose loop from one bowl air vent to the other. The top of the loop had many holes in it. The idea is that if you have your fuel level set fairly high, and are on extreme off angles fuel will not slosh out the bowl vents.
Hope that helps.
Adios, David
co-author of the Falcon Performance Handbook My Blog - My WordPress Blog
Last edited by chrlsful; Apr 2, 2018 at 04:36 PM.
Reason: 4 da 'bolds'
I'm lookin 4 "DragonWagon" community / farm whatever they call themselves these daze - could B near Ava, MS.
Some folks in Ozarks that take in guests....
Yea I was a little to busy dragging a broke Toyota (front steering link) back to camp and then a Jeep off the top of a 3 foot stump... to take pics. My copilot was distracted by something....to take any good "on the hill" climb pics.
billythedistributorman@live.com
"Holley offers a carb just for that purpose. It has a spring loaded needle & seat combo. Both the Autolite Carb & the Holley are designed for a larger engine than a six cylinder we play w/on here.
Therefor you need to put interchangeable jets in the PVCR under the power valve. You can change the main jets to get the proper cruise A/F ratio of 14.00-14.50. When you go to WOT the ratio will be too rich for maximum power.
The Autolite has the annular discharge nozzles & that allows a larger carb to still meter fuel properly.
The 350 Holley is ok as is, but put a 500 on there & you need to install annular discharge nozzles & en large the venturi cause the annular nozzles are larger & restrict air flow."
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