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Unread 08-21-2013, 12:11 PM   #1
shadoow
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mc 2100/2150 vs. Weber 38 DGES

i've read a lot of posts on these carbs and either seems to be good. I'm looking for someone that is familiar with both as i'm wondering which would be easiest to change between low and high elevations. I live at low elevation, but we go to higher elevation (8000-12000 ft.) in the summer. I would like to use my jeep in both situations. Jeep has a 258.

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Unread 08-22-2013, 07:31 AM   #2
shadoow
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anyone ??? maybe someone that's familiar with retuning either of these carbs for elevation change??
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Unread 08-22-2013, 07:50 AM   #3
swatson454
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I've been watching this one for someone who has done both carbs. I know a Weber 38 would go from a 145 main jet down to a 135 or maybe even a 130 and the jets are pretty easy to change. You'd need to take the idle jets down to 45s as well. Those are super easy to swap out.

I have no idea what's needed on an MC but Webers have quite a bit of tuning available with separate idle jets.


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Unread 08-22-2013, 09:14 AM   #4
shadoow
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thanx for the info swatson. To change the weber jets as you described does the carb have to be removed from the intake manifold??

On the MC carb my understanding is the jets and likely the power valve has to be changed and changing the power valve requires removal of the carb as it's on the bottom. Can someone verify??
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Unread 08-22-2013, 09:30 AM   #5
swatson454
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Quote:
Originally Posted by shadoow View Post
thanx for the info swatson. To change the weber jets as you described does the carb have to be removed from the intake manifold??
No but the top of the carb has to come off. It's quick and easy with the exception of that tiny c-clip on the choke plate. It comes off really easy but likes to play hide-and-seek.

The idle jets are located on the side of the carb and can be swapped out in no time with just a screw driver.

I can't imagine an MC needing a power valve swap


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Unread 08-22-2013, 10:22 AM   #6
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Quote:
Originally Posted by swatson454 View Post
......

I can't imagine an MC needing a power valve swap


Shawn
Me either. Changing the PV will change the point in acceleration at which the extra fuel is let into the system but unless the OP putts around at 1/4 throttle all day it will still do it's job.
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Unread 08-22-2013, 01:57 PM   #7
shadoow
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OK, sounds like i'm wrong on the MC power valve so that's good to know, appreciate it.
Can the jets on the MC be changed similarly to the Weber??
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Unread 08-23-2013, 03:21 AM   #8
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Quote:
Originally Posted by shadoow
OK, sounds like i'm wrong on the MC power valve so that's good to know, appreciate it.
Can the jets on the MC be changed similarly to the Weber??
I ran a mc 2100 for a couple years. I put #47 jets in and it ran well. To change the jets, take off the top and they are in the bottom of the bowl.
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