4cyl swap

blue95sho · 08-10-2001, 05:50 PM

I am thinking about buying a 4cyl mustang. How would swapping a 2.5 in place of the 2.3 affect performance? They are the same engine from what I can tell, only the 2.5 has a bigger stroke. Would this even be worth the time and effort to pick one out and bolt the other in? Any weak points in th 2.5 that I should know about?

RAGE_5.0 · 08-11-2001, 01:00 PM

i think u should pickout a 302 or a 351 and drop that in=).......are u talking about the 2.5l mazda engine they put in the probes?
cause i know the 96 probe gt's move along pretty good my buddy has 1

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Black 1990 gt cobra bonestock
not for long

ARMYMANUS · 08-16-2001, 12:25 AM

forget about the lil 4 banger, go something mean like a 5.0 or a 5.8 or hell why not a 392 gt-40 stroker. with 430 hp

84LX89GT · 08-20-2001, 03:50 PM

The 2.5L 4 cylinder was used in newer rangers and is a dual plug engine, so you'd either have to use the 2.3L's head and the bottom end of the 2.5L to use it in a '87 to '90 mustang, whereas it's a direct bolt in to the '91 to '93 mustangs(which i believe are exactly the same). The '91-'93 mustangs with the 2.3L had 105hp stock, whereas the '87 to '90 2.3's had only like 88 horsepower, i believe both engines made 135lb/ft of torque or maybe the earlier ones a little less. I believe the extra displacement would add like 10 to 15 horsepower, but really isn't worth the trouble. A turbo would be a much better swap though. Why are you thinking of building up a 2.3L (or 2.5L). It would cost about twice the cost of a stock 5.0L mustang to make a 2.3L as fast as a stock 5.0L mustang.
- Another note is that 4 cylinder mustangs came with weaker springs, weaker shock/strut valving, no rear sway bar, puny front sway bar, small radiator, weaker 7.5" rear end, non-heavy duty ball joints, smaller brakes, and incredibly weak transmissions (both the auto and manaul were different than the 5.0L although the manual was a weak duty T5 based on the GT's heavy duty T5
Good luck, if i were you, i'd either mod a 5.0L or get the 2.3L just for commuting and good mileage.

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previous name: 84stangLX
'84 Mustang 5.0 LX
my LX
'89 Mustang GT
my GT

08-10-2001, 05:50 PM	#1
blue95sho Registered Member Join Date: Jun 2001 Location: Athens, LA, USA Posts: 6	4cyl swap I am thinking about buying a 4cyl mustang. How would swapping a 2.5 in place of the 2.3 affect performance? They are the same engine from what I can tell, only the 2.5 has a bigger stroke. Would this even be worth the time and effort to pick one out and bolt the other in? Any weak points in th 2.5 that I should know about?

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08-11-2001, 01:00 PM	#2
RAGE_5.0 Registered Member Join Date: Jul 2001 Location: Leamington, Ontario, Canada Posts: 767	i think u should pickout a 302 or a 351 and drop that in=).......are u talking about the 2.5l mazda engine they put in the probes? cause i know the 96 probe gt's move along pretty good my buddy has 1 ------------------ Black 1990 gt cobra bonestock not for long

08-16-2001, 12:25 AM	#3
ARMYMANUS Registered Member Join Date: Jun 2001 Location: alamogordo,nm,usa Posts: 23	forget about the lil 4 banger, go something mean like a 5.0 or a 5.8 or hell why not a 392 gt-40 stroker. with 430 hp

08-20-2001, 03:50 PM	#4
84LX89GT Mustangs Join Date: Jul 2000 Posts: 1,938	The 2.5L 4 cylinder was used in newer rangers and is a dual plug engine, so you'd either have to use the 2.3L's head and the bottom end of the 2.5L to use it in a '87 to '90 mustang, whereas it's a direct bolt in to the '91 to '93 mustangs(which i believe are exactly the same). The '91-'93 mustangs with the 2.3L had 105hp stock, whereas the '87 to '90 2.3's had only like 88 horsepower, i believe both engines made 135lb/ft of torque or maybe the earlier ones a little less. I believe the extra displacement would add like 10 to 15 horsepower, but really isn't worth the trouble. A turbo would be a much better swap though. Why are you thinking of building up a 2.3L (or 2.5L). It would cost about twice the cost of a stock 5.0L mustang to make a 2.3L as fast as a stock 5.0L mustang. - Another note is that 4 cylinder mustangs came with weaker springs, weaker shock/strut valving, no rear sway bar, puny front sway bar, small radiator, weaker 7.5" rear end, non-heavy duty ball joints, smaller brakes, and incredibly weak transmissions (both the auto and manaul were different than the 5.0L although the manual was a weak duty T5 based on the GT's heavy duty T5 Good luck, if i were you, i'd either mod a 5.0L or get the 2.3L just for commuting and good mileage. ------------------ previous name: 84stangLX '84 Mustang 5.0 LX my LX '89 Mustang GT my GT