streetjeep2.5 Posted December 31, 2009 Share Posted December 31, 2009 I don't know of any cams for the 2.5, and even if you did find higher compression pistons, I doubt they'd do you any good. Delta Camshaft Company in Tacoma WA used to make a few different lift and duration regrinds for the 2.5. I have the smallest step up regrind in mine to help it breath better. Was able to use stock lifers, pushrods, etc. My 2.5 says stock it has 9.2 compression. Think that's plenty unless you want to have to use higher octane gas. Link to comment Share on other sites More sharing options...
AMC-MJ Posted December 31, 2009 Author Share Posted December 31, 2009 the way they rated changed sure but the power out put didn't change. i ran 2 a like engines with 2 different rating's and when both were engine dynoed they turned the same number's at the flywheel then once installed in a like vehicles they also chassie dynoed almost identically . . . AMC also used 10, 10.2 and 12.5 :1 Compression ratio's on the engines i listed which where also tuned for performance app's. the 330hp n 430tq 401 v.s. the 215hp n 320tq 401 would more then likely would turn the same numbers if tested side by side . . . unless the 330hp engine was a 10:1 motor then its going to turn higher numbers. . . Mike Link to comment Share on other sites More sharing options...
Automan2164 Posted December 31, 2009 Share Posted December 31, 2009 But i as i said i'm no longer interested, it is what it is, I'm just going to use it as a beater and drive it till something expensive break's n recycle it . . . Mike You keep saying this. :headpop: It really irritates me. I like ya so far, seem to be a bit of a wildcard, like myself. But coming into the Comanche forum, and bagging on the 4.0l, as well as a stout little 5 speed, isn't the best way to get on everyone's good side. Everything on this truck is a cheap and simple fix. As for the axles, that yard we are all going to on the 6th of Feb, has axles for set prices. You could pick up a late model, Chryco 8.25 with 29 spline axleshafts for $85 drum to drum. You could get a non-disco Dana 30 disc to disc for $130. Not bad for a 4wd conversion. Also, the transmissions are $90, as the transfer cases $90 also. Easy as pie 4WD conversion, with a drive-train that would run until the world runs out of fuel. That 2.5 will run forever. Also, Pat(JeepcoMJ) and I have a parts Cherokee with the MPFI and the 2.5L. Also has an AX5, and a 231 all set up for it, that work good. I would recommend a swap to the MPFI, aftermarket header, cold air intake, and call it a job. Help it get fuel, help it suck in, and help it blow out. Increase the volumetric efficiency of the engine, and help it work. The harness swap is really straight forward, and is plug and play. And if you do get to the point where you are going to "recycle" it, call me. I would love to build a 4 popper with 4x4 as a DD, and I could get it done cheap for myself. No hard feelings, just don't want you to come here and bag our mills. Rob L. :cheers: Link to comment Share on other sites More sharing options...
AMC-MJ Posted December 31, 2009 Author Share Posted December 31, 2009 I gotcha, i was simply stating i wasn't interested in the 4 Leakier as every i inspected had and air box full of oil, almost every 5spd manual howled and whined . . . So when i was this recurring problem then asked others about it ti got told the 4.0 was powerful but ate through oil, the 5spd manual whined an failed often and i was to avoid them. . . So i did so as i was trying to find a cheap DD so i could park my K2500 as couldn't afford to make payment on it and repair the truck at the same time because it kept breaking down. I have a 2.5L 4spd manual 2WD short bed Comanche, i had no interest in the 4.0 nor was interested in an engine swap, but if i was i would have gone with an AMC V-8 regardless of the power rating's. But like i said i have no interest in doing such a swap . . . Most people would have dropped the issue after i had said not interested, not tried to beat it down one's throat . . . Next time i'll just ignore it i guess . . . I was started the thread for finding stuff out about the 2.5L TBI simple mod's like TBI spacer cold air intake exhaust up grades, header, muffler's, and what sized pipe works best. anything else along them lines . . . Mike Link to comment Share on other sites More sharing options...
Automan2164 Posted December 31, 2009 Share Posted December 31, 2009 Fair enough. I understand where you are going... But I think the guys are just a little agitated that you are bagging on the 4.0L. I don't think they are telling you that you should swap it in, but trying to tell you its a good engine... Having said that, I will say this: 1. The 4.0L is a good engine. 2. The oil "Blow by" you have seen and heard horror stories of, is not so much blow by, as it is a problem with the CCV system. I think you have given it a bad wrap. I just want to show you its a good engine, (and I know you don't want to put one in ;) ) My one donor had 298,000 Miles on the 4.0L, and once I fixed the CCV system, didn't drop one bit of oil in the filter. :brows: 3. The only "Real" problematic 5 speed is the BA 10 5 (Peugot), that was found behind the 4.0L, '87-'89. 4. The AX5 5 speed is IDENTICAL to the AX4 in your truck now, except the emission of one gear, the AX5 is a very stout, reliable transmission behind the 2.5L. What I reccommend for your 2.5L(If kept TBI): 1. Cold air intake of somesort to help the sucking of good stuff. 2. Aftermarket header to help the blowing of bad stuff 3. Throttle body spacer to increase the available fuel air mixture. 4. Electric fan converison. Loose the drag on the engine, and give it an E-fan. 5. Decent exhaust after the header. 2.25 should be fine... 6. GEARS! :yes: No worries mate... But please understand, the 4.0L is a good engine... You just may not have had a good experience. Rob L. :cheers: Link to comment Share on other sites More sharing options...
mnkyboy Posted December 31, 2009 Share Posted December 31, 2009 :agree: with automan Link to comment Share on other sites More sharing options...
Geonovast Posted December 31, 2009 Share Posted December 31, 2009 Why do we have the same discussion going on in two separate threads? Link to comment Share on other sites More sharing options...
AMC-MJ Posted December 31, 2009 Author Share Posted December 31, 2009 :dunno: I'm not sure how we got on the same chat 2 different place's one was about general truck data the other was about Upgrades and modifications :dunno: Mike Link to comment Share on other sites More sharing options...
AMC-MJ Posted December 31, 2009 Author Share Posted December 31, 2009 Fair enough. I understand where you are going... But I think the guys are just a little agitated that you are bagging on the 4.0L. I don't think they are telling you that you should swap it in, but trying to tell you its a good engine... Having said that, I will say this: 1. The 4.0L is a good engine. 2. The oil "Blow by" you have seen and heard horror stories of, is not so much blow by, as it is a problem with the CCV system. I think you have given it a bad wrap. I just want to show you its a good engine, (and I know you don't want to put one in ;) ) My one donor had 298,000 Miles on the 4.0L, and once I fixed the CCV system, didn't drop one bit of oil in the filter. :brows: 3. The only "Real" problematic 5 speed is the BA 10 5 (Peugot), that was found behind the 4.0L, '87-'89. 4. The AX5 5 speed is IDENTICAL to the AX4 in your truck now, except the emission of one gear, the AX5 is a very stout, reliable transmission behind the 2.5L. What I reccommend for your 2.5L(If kept TBI): 1. Cold air intake of somesort to help the sucking of good stuff. 2. Aftermarket header to help the blowing of bad stuff 3. Throttle body spacer to increase the available fuel air mixture. 4. Electric fan converison. Loose the drag on the engine, and give it an E-fan. 5. Decent exhaust after the header. 2.25 should be fine... 6. GEARS! :yes: No worries mate... But please understand, the 4.0L is a good engine... You just may not have had a good experience. Rob L. :cheers: i got told the same about the 6.5 a handful of guy's said no the 6.5 is great diesel you just gotta fix these things here and rattled off a list, which i tired working my way threw but it failed to often for me to get it 100% set, i really didn't want to get involved in another engine like it which is what the 4.0L seems to be . . . few thing's needing to be addressed then all the "bad stuff goes away" or it sounds simulair to me. ok fine, the 4.0 n 4.0 HO ain't as bad as one thought ok, but to me it's always going to be the 4leakier :cheers: Thank's for the 2.5L advice :bowdown: i was trying to find which gears i had in the other thread so i would avoid buying a ratio and finding out i already have that ratio . . . Mike Link to comment Share on other sites More sharing options...
Automan2164 Posted December 31, 2009 Share Posted December 31, 2009 Yeah, but that 6.5L Diesel is a turd... I work on them on and off since we have a few city trucks running them... Loud as crap, not much power to be had for all the noise it makes... Real finnicky POS. The injector pump seems to be the root problem A LOT. It was a bad design from the start, and the engine is better suited as a boat anchor. The 4.0 may leak, spit, burn oil, and act weird if not taken care of, but it will always come back for more... Its a hard bastard to kill. PM me if you want with the problems with the 6.5L... May be able to help ya out. Rob L. Link to comment Share on other sites More sharing options...
AMC-MJ Posted December 31, 2009 Author Share Posted December 31, 2009 PM sent i sent you some info that might help you as well on fixing the 6.5's . . . now that i know the in's & out's . . . ......................................................................................................................................................................... Now what gearing should i go with ? i'm going to be running either a 235/75R15 29.1" tall tires or G78-15 28.5" tall tires. i'll more then likely run the 235's weather i regear it or not. what gearing should i swap to if i get around to it ? Mike Link to comment Share on other sites More sharing options...
dasbulliwagen Posted December 31, 2009 Share Posted December 31, 2009 4:10 is what came on most 2.5, or 2.8 v6 models with the 5 speed. I have this exact combination in my truck with 235 BFG A/T tires and it works very well. Your truck should have 3:55 gears in it right now with the 4 speed. If you find a donor vehicle with a 4 cyl, and an auto tranny, it should have 4:56 gears factory and would be even better to run if you switch to the AX5. But if you stay with the 4 spd, 4:10 will be just fine. Link to comment Share on other sites More sharing options...
AMC-MJ Posted December 31, 2009 Author Share Posted December 31, 2009 :cheers: 1987 Comanche Sportruck 2.5 2wd 342000 miles <- really ! ? ! ? :bowdown: I knew that 2.5 seemed awful durable, mine has 189,000 no blow by no oil leaks runs strong, it has a good amount of power but with the new tires it's going to get doggy i'm sure thats why i would like to get it Regeared around the time i get new tires. . . Mike Link to comment Share on other sites More sharing options...
streetjeep2.5 Posted December 31, 2009 Share Posted December 31, 2009 No worries mate... But please understand, the 4.0L is a good engine... You just may not have had a good experience. Rob L. :cheers: Really! Truly! The 4.0 in our 94 Cherokee 4x2 is nearing 265,000. As far as engine goes I have tuned it and change the oil regularly, replaced belts, changed a crank sensor, starter, water pump, and idler, and that's all! Still have original Alt cranking out the amps, no noise at all at start up after oil change (I do put oil in the filter at changes). Fantastic engine! BTW, my 4 speed auto is still shifting just fine and fluid is nice and red! :banana: Link to comment Share on other sites More sharing options...
AMC-MJ Posted December 31, 2009 Author Share Posted December 31, 2009 Cool good for you very awesome . . . the 2.5 is good enough for my Cheap Jeep heap . . . Mike Link to comment Share on other sites More sharing options...
freakjeep93 Posted December 31, 2009 Share Posted December 31, 2009 ive got a 4.0 with 550000 kilometers on it that would be what about 275000 miles? somwthing like that . no blow by runs good ( or at least it did before the gas tank was taken away) and had TONS of power too much for a 2wd with no wight in the back.I'm swapping it into thy resto project. Link to comment Share on other sites More sharing options...
Geonovast Posted December 31, 2009 Share Posted December 31, 2009 550,000 kilometers is 341,000 miles. Link to comment Share on other sites More sharing options...
AMC-MJ Posted December 31, 2009 Author Share Posted December 31, 2009 Very cool, that is an awful lot of miles . . . :rotf: look at me calling 340K a lot of miles, Most my truck's have between 300-500K miles :rotf: :rotfl2: its true sad but true :hmm: of course there also 30-50 years old as well. . . Mike Link to comment Share on other sites More sharing options...
freakjeep93 Posted January 1, 2010 Share Posted January 1, 2010 550,000 kilometers is 341,000 miles. kool i really need to learn how to convert miles to kilometers and vise versa Link to comment Share on other sites More sharing options...
Geonovast Posted January 1, 2010 Share Posted January 1, 2010 Kilometers to Miles: 550,000 x 0.62 = 341,000 Miles to Kilometers: 341,000 / 0.62 = 550,000 So, 100 kph is 62 mph. Link to comment Share on other sites More sharing options...
freakjeep93 Posted January 1, 2010 Share Posted January 1, 2010 oh I'm a dummy shouldnt i learn this in skool Link to comment Share on other sites More sharing options...
AMC-MJ Posted January 1, 2010 Author Share Posted January 1, 2010 :rotf: :Canadaflag: :rotf: :USAflag: :rotf: US CA conversions . . . Mike Link to comment Share on other sites More sharing options...
AMC-MJ Posted January 3, 2010 Author Share Posted January 3, 2010 :waving: Truck goes in tomorrow for the exhaust, Complete 2" pipe with a turbo muffler $240. I'm betting it's going to sound sally n poopy silent :fs1: . . . Mike Link to comment Share on other sites More sharing options...
aemsee Posted January 3, 2010 Share Posted January 3, 2010 I've got a 87 2.5 with AW4 and 4:56 gears with 235/75/15 tires.. If you take the time to regear, go with the 4:56's. I also don't believe that the D35 will break if you drop it in to gear above 400RPM's. With a 2.5, DD and normal tires it should do just fine. Link to comment Share on other sites More sharing options...
AMC-MJ Posted January 3, 2010 Author Share Posted January 3, 2010 Exhaust: ah yea ! . . . 2" pipe, through flow turbo muffler all new pipe . . . exhaust manifold leaks missing a bolt in cylinder #4 ! that exhaust sound's sweet ! nice n mellow when idling or driving and i little bit of nice rap to it when you romp on it. . . it was well worth the $240+$20 tip = $260 & 1yr warranty ! GEARS: So all of the gears 4.11, 4.56, 4.88 all the same price... 4.11's n 4spd ? or 4.56's n 5spd ? Mike Link to comment Share on other sites More sharing options...
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