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Members currently using Flashchat: 0
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The most chatters online in one day was 3, 05-15-2008.
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10-02-2008, 04:13 PM
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#1
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1991 3.1 Firebird engine
Join Date: Sep 2008
Location: Eastern OK
Posts: 7
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Jeep Flywheel Question
Will a flywheel from a Sunbird 3.1 engine fit a Firebird 3.1 engine? From what I have read they are the same engine.
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10-03-2008, 02:23 AM
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#2
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Join Date: Oct 2003
Location: Elkhart, Indiana
Posts: 1,527
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One is going to be an iron head engine and one is going to be an aluminum head engine. As for the flywheel being the same, it probably depends on the year of the Firebird if it is going to be internally balanced or externally (using the flywheel).
__________________
91 Black Lumina Z34-5 speed (Awaiting a slow and horrible death to see the Junkyard in the sky  )
92 Black Lumina Z34-5 speed (now with new hollow cat!!)
94 Ford Ranger Red 2WD (for now) 5 speed 2.3l Dual Plug "Lima" engine
http://www.fquick.com/pocket-rocket
 
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10-03-2008, 02:46 PM
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#3
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1991 3.1 Firebird engine
Join Date: Sep 2008
Location: Eastern OK
Posts: 7
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pocket-rocket
The engine is from a 91 Pontiac Firebird 3.1 L 191. It had a auto and I am putting the engine in a 90 Jeep Wrangler w/5 speed manual. SACHS had a flywheel but they only specify for a Sunbird. I am also transfering the ECU and wiring harness from the Firebird into the Jeep. Any ideas?
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10-06-2008, 08:10 PM
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#4
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Used Isuzu Dealer
Join Date: Sep 2006
Location: Hood River, Oregon
Posts: 682
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What engine did your Jeep have originally? More importantly, what transmission will you be using? Some Jeeps came with a 2.8L, in which case you'd use that flywheel (assuming it's neutrally balanced). But the 90's didn't use the 2.8L... need more info.
I think this question should be broken off into it's own thread.
__________________
'90 Isuzu Trooper LS, 3.4L SFI V6 - swapped and awesome
'81 Isuzu I-Mark LS, 1.8L N/A Diesel
'94 Isuzu Trooper S, 3.2L SOHC V6 - mildly wrecked
'91 Isuzu Trooper SE, no engine - possible swap candidate
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10-06-2008, 08:35 PM
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#5
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1991 3.1 Firebird engine
Join Date: Sep 2008
Location: Eastern OK
Posts: 7
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Engine Swap
Quote:
Originally Posted by Canyonero
What engine did your Jeep have originally? More importantly, what transmission will you be using? Some Jeeps came with a 2.8L, in which case you'd use that flywheel (assuming it's neutrally balanced). But the 90's didn't use the 2.8L... need more info.
I think this question should be broken off into it's own thread.
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The original Jeep engine is a 2.5 I4. The transmission is an A5 (not the AX15). General comment is to swap trans along with engine. But "IT" has not given me any problems in over 10 years and I don't plan to do any radical trails with this vehicle. It is a daily driver. The 3.1 will bolt directly to the 2.5 as the engine bolt patten and the trans bolt pattern are the same. I have been questioning the flywheel isssue because I was told I would need to use a GM flywheel.
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10-06-2008, 09:08 PM
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#6
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Used Isuzu Dealer
Join Date: Sep 2006
Location: Hood River, Oregon
Posts: 682
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I used this 142 tooth flywheel, used on lots of GMs (and a few Isuzus):
http://www.partsamerica.com/ProductD...pe=267&PTSet=A
The Jeeps that had a 2.8L use a 148 tooth flywheel like this one:
http://www.partsamerica.com/ProductD...pe=267&PTSet=A
BUT, I really have no idea what your tranny would take.
__________________
'90 Isuzu Trooper LS, 3.4L SFI V6 - swapped and awesome
'81 Isuzu I-Mark LS, 1.8L N/A Diesel
'94 Isuzu Trooper S, 3.2L SOHC V6 - mildly wrecked
'91 Isuzu Trooper SE, no engine - possible swap candidate
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10-08-2008, 04:02 PM
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#7
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1991 3.1 Firebird engine
Join Date: Sep 2008
Location: Eastern OK
Posts: 7
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Went to the website and compared flywheels. some part number for Firebird and Sunbird. Don't know the difference you metioned about neutral balance, iron head, aluminum. But the key is the flywheel has to bolt up to the engine and be the right one. Well ! off to work I goes!
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10-08-2008, 04:03 PM
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#8
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1991 3.1 Firebird engine
Join Date: Sep 2008
Location: Eastern OK
Posts: 7
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Same part numbers for Firebird and SunBird.
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10-08-2008, 04:10 PM
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#9
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Used Isuzu Dealer
Join Date: Sep 2006
Location: Hood River, Oregon
Posts: 682
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Quote:
Originally Posted by SubTech
Same part numbers for Firebird and SunBird.
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What is your engine from. In one post you said Sunbird, and the other you said Firebird.
Firebird makes sense, that's a RWD engine.
Nevermind, I just re-read the post. I'm still not sure why we care about the sunbird if you're dealing with a firebird engine in a jeep. Did someone specifically tell you that a sunbird flywheel will mate a firebird engine with your jeep tranny? What about the clutch?
__________________
'90 Isuzu Trooper LS, 3.4L SFI V6 - swapped and awesome
'81 Isuzu I-Mark LS, 1.8L N/A Diesel
'94 Isuzu Trooper S, 3.2L SOHC V6 - mildly wrecked
'91 Isuzu Trooper SE, no engine - possible swap candidate
Last edited by Canyonero; 10-08-2008 at 04:12 PM.
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10-08-2008, 05:12 PM
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#10
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Site Coder
Join Date: Apr 2000
Location: Bella Vista, AR
Posts: 5,892
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Reread post #3 now. He was stating that a manufacturer had a flywheel, but the only listed application was a Sunbird.
__________________
-Brad
94 Beretta : Burned to the Ground
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