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Unread 09-16-2012, 09:33 PM   #1
TA-YJ
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1992 YJ Wrangler 
 
Join Date: Dec 2007
Location: Pennsylvania
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Size of 2.5 and 4.0 Throttle Body

Can someone give me the measurement for the size of the two throttle bodies that mates to the manifold? I picked up a rebuild engine that came with a TB and I wanted to double check if it was a 2.5 or 4.0. Thanks.

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1992 YJ 2.5L
Engine Mods:4.0L TB, Ford Design III 19lb Injectors, Firepower Ignition System, Ford TBird Electric Fan, Pacesetter Header, Magnaflow Cat, Dynomax Super Turbo Exhaust
Suspension Mods:BDS 2" Lift, M.O.R.E. 5/8" HD Shackles, 1" Brown Dog MML
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Unread 09-17-2012, 05:05 AM   #2
Duncan542
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Not sure on the 2.5 but 4.0 is either 60 mm or 62 mm.
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Unread 09-17-2012, 08:13 AM   #3
TA-YJ
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Any way you could take a measurement? I thought the 4.0 was less than that bc the 62mm was an upgrade for it
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1992 YJ 2.5L
Engine Mods:4.0L TB, Ford Design III 19lb Injectors, Firepower Ignition System, Ford TBird Electric Fan, Pacesetter Header, Magnaflow Cat, Dynomax Super Turbo Exhaust
Suspension Mods:BDS 2" Lift, M.O.R.E. 5/8" HD Shackles, 1" Brown Dog MML
Other:LED Tails and Herculined
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Unread 09-17-2012, 12:14 PM   #4
Que89YJ
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http://www.jeepforum.com/forum/f12/2...y-swap-602123/

Quote:
Originally Posted by 4bangerYJ View Post
The stock 2.5 TB is 48mm
The stock 4.0 TB is 55mm
The gasket is 62mm.
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Unread 09-17-2012, 01:10 PM   #5
mrdeath2000
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you can get the 4.0 bored.

get it from someone reputible, if they go to 62mm bore and it's not done right it will whistle. you can push it to 63mm i think, but it's not advised. some only go to 60mm, still plenty big... hell stock 4.0 at 55mm is plenty big unless you start playing with fuel pressures with an adjustible regulator and/or playing with MAP voltages.
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Unread 09-17-2012, 06:56 PM   #6
Duncan542
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Quote:
Originally Posted by mrdeath2000
you can get the 4.0 bored.

get it from someone reputible, if they go to 62mm bore and it's not done right it will whistle. you can push it to 63mm i think, but it's not advised. some only go to 60mm, still plenty big... hell stock 4.0 at 55mm is plenty big unless you start playing with fuel pressures with an adjustible regulator and/or playing with MAP voltages.
I have heard alot of people have better luck with 60mm rather than 62mm
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Unread 09-19-2012, 11:24 AM   #7
TA-YJ
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Thanks for the measurements! Got everything squared away.
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1992 YJ 2.5L
Engine Mods:4.0L TB, Ford Design III 19lb Injectors, Firepower Ignition System, Ford TBird Electric Fan, Pacesetter Header, Magnaflow Cat, Dynomax Super Turbo Exhaust
Suspension Mods:BDS 2" Lift, M.O.R.E. 5/8" HD Shackles, 1" Brown Dog MML
Other:LED Tails and Herculined
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