muddymj Posted February 2, 2011 Posted February 2, 2011 I'm wondering if the 2.5l in the 87-90 are the same and bolt right in with no different harness ?
1987Comanche Posted February 3, 2011 Posted February 3, 2011 It is a direct bolt-in but there are some differences between the '86 2.5 and the '87-'90. '86 used V-belts and '87+ used a serpentine belt. Alternator, P/S, etc are different. The oil filters are different as well. My '87 had an engine from an '86 transplanted by a PO.
1986Comanche Posted February 3, 2011 Posted February 3, 2011 It is a direct bolt-in but there are some differences between the '86 2.5 and the '87-'90. '86 used V-belts and '87+ used a serpentine belt. Alternator, P/S, etc are different. The oil filters are different as well. My '87 had an engine from an '86 transplanted by a PO. The 1986 2.5L could have either V-belts or a Serpentine belt.
Harley Posted February 3, 2011 Posted February 3, 2011 Not true. My 86 2.5 runs a single belt and no V-belts
alleydog Posted February 3, 2011 Posted February 3, 2011 How about 91 multi port, will the 86 long block accept the 91 accessories? It's for in my 91 YJ
muddymj Posted February 3, 2011 Author Posted February 3, 2011 i was thinking about the 91 but isnt the harness different rather put a 4.0 in but can't find decent parts rig with the high output
alleydog Posted February 3, 2011 Posted February 3, 2011 I have a 91 yj with a 2.5, and a 89 comanche with a 4.0, and I just love the power of the six compared to the four. I don't keep track of fuel mileage very close, but I know the 2.5 only gets 13 mpg on the highway because I never use 5th gear, it won't pull it with 31 in tires. I guess the only reason I would like to keep the 2.5 is because all my other drivetrain parts are good, and being my DD I want to keep it simple. I'm 600 miles away from 200,000!
muddymj Posted February 4, 2011 Author Posted February 4, 2011 Alright u convinced me to go with 4.0 and wait longer. I have a 4.0 stroked in my 98 Cherokee 5 sod long armed on 35s with 4.56 and it pulls awesome
mnkyboy Posted February 4, 2011 Posted February 4, 2011 I have a 91 yj with a 2.5, and a 89 comanche with a 4.0, and I just love the power of the six compared to the four. I don't keep track of fuel mileage very close, but I know the 2.5 only gets 13 mpg on the highway because I never use 5th gear, it won't pull it with 31 in tires. I guess the only reason I would like to keep the 2.5 is because all my other drivetrain parts are good, and being my DD I want to keep it simple. I'm 600 miles away from 200,000! That's not even close to a fair comparison. My 89 MJ with 2.5 walks all over my brothers 95 YJ with 2.5
muddymj Posted February 4, 2011 Author Posted February 4, 2011 i talked to a guy with a built yj on 37s stretched on 488s and he said it pulled getting on freeway with the 2.5
Mike Stone Posted February 4, 2011 Posted February 4, 2011 Ive seen complete dawgs of an engine 2.5's and Ive owned really good running 2.5's! There a toss up. Id rather have the multi port, way better response and more power over the sluggish TBI. Aww and too answer the question the long blocks are the same so you would have to use the wrangler intake but all in all a complete bolt in! good luck , post some pics
mnkyboy Posted February 4, 2011 Posted February 4, 2011 i talked to a guy with a built yj on 37s stretched on 488s and he said it pulled getting on freeway with the 2.5 I have 33x12.50s a 2.5l and currently 3.55 gears,mine has no problem getting on the freeway either.
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