81 J10 tune up - Page 3 - JeepForum.com
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post #31 of 35 Old 04-08-2013, 03:23 PM Thread Starter
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1981 J-Series Truck 
Join Date: Mar 2013
Location: Billings
Posts: 15
it didnt tell me that. it had a calculator. but i dont know some of the specs lol

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post #32 of 35 Old 04-08-2013, 03:48 PM
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1985 FSJ Wagoneer 
Join Date: Nov 2011
Location: Tyler
Posts: 662
Are they OEM?

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post #33 of 35 Old 05-14-2013, 12:19 AM Thread Starter
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1981 J-Series Truck 
Join Date: Mar 2013
Location: Billings
Posts: 15
Oh how i wish i had my own machine shop lol So here is the skinny guys n gals,

1. Machine shop took 3 weeks longer then what he was supposed to but i got my engine finally. Looked freakin great!! Painted it up(will post pics tomorrow) and put it in and man does it run. Had a lil issue with trying to line the dist up due to it being in the wrong place when i started :-/ But i got it whipped lol The thing purrs like a kitten the only issue i am having now is the hesitation i get off acceleration. which brings me to number 2 lol

2. Whilst taking apart my MC2100 i found some left over snot(probably from the few backfires i had lol) and a bowl float that was way out of adjustment :-/ oh and a wrong air horn to carb gasket. But that isnt anything a new carb kit cant fix hehehe so here is the question.....When i took the old jets out it says 56f on them. i have a PDF file i found whist surfing the various jeep forums out there that explains a break down, rebuild, and tune for a mc2100. granted it says its for a 258, but it has all the specs for a 360 in it. in this file it talks about using jet #46-#47 at sea level, #48 for modified engines, and #45 for anything over 3000ft. well i live here in good old Montana and spend most my time well above 3000ft. so here is my question???

What jet size would work best for my application?? i want to save on fuel and bring this engine to live
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post #34 of 35 Old 05-14-2013, 08:36 AM Thread Starter
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1981 J-Series Truck 
Join Date: Mar 2013
Location: Billings
Posts: 15
any thoughts anyone??
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post #35 of 35 Old 05-16-2013, 11:00 AM
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1999 WJ 
Join Date: May 2006
Location: Austin
Posts: 1,415
56 will be way Rich for your altitude. You may see of someone nearby has or you can purchase a wideband 02 sensor and have an 02 bung welded into the exhaust. I use an AEM thats dash mounted in my WJ Stroker l but tuned my wagons 360 with my LM2 dual wideband data logger. My motorcrap carb was stupid Rich at 500 above sea level in Austin TX. Someone had a single action power valve in it in place of the dual stage unit, this created a.constant enrichment. I rebuilt back to stock and still had to open the altitude compensator to get the mix near 14.2 @ cruise. This and ignition upgrade got me up from 5mpg to 13hwy 11avg. Still sux but at least double digits. Without multi point injection you really cant criuse a carb at 14.7 -.15.3:1 as some cylinders will end up too lean due to crappy mixture distribution. same for tbi, so its possible with full efi and computer controlled timing to get 1-3 more mpg from injection. My motorcraft still has an off idle stumble no matter what I have tried I think it just has some crap still in the transfer slots or in the main body that an over night soak in chemtool could not even touch. I have a pile of new top end parts waiting to go on valves,springs, perf rpm air gap and Holley HP 750. Large crane cam .540 lift 302 adv duration. Going to port heads and such but want to refresh the bottom end, swap pistons, and install a mild stall.converter

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