LT1 vs LT4 engine weights
Thread Starter
Pro
Joined: Aug 2001
Posts: 683
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From: mississauga ON
LT1 vs LT4 engine weights
Total Engine Weight for the LT1 is 261.44 kg (576.4 lbs). Total Engine Weight for the LT4 is 341.83 kg (753.6 lbs). Any thoughts as to where the LT4 picks
up that extra 175 lbs.
I recall reading an article (can't remember where) that suggested the
LT4 motor was originally intended to go in the C5, but was later scrapped
for a totaly new engine. I wonder if weight was a factor?
**************************************** ******
Peter
Black on Black LT4
up that extra 175 lbs.
I recall reading an article (can't remember where) that suggested the
LT4 motor was originally intended to go in the C5, but was later scrapped
for a totaly new engine. I wonder if weight was a factor?
**************************************** ******
Peter
Black on Black LT4
Melting Slicks
Joined: Apr 2000
Posts: 3,198
Likes: 2
From: Northern CA
Re: LT1 vs LT4 engine weights (LT4Coupe)
What's the source of this info? All of it sounds bogus to me. :)
FWIW the Corvette Black Book says the '92 LT1 weighs ~450 lbs. I don't know if that includes all the accessories or what, though.
FWIW the Corvette Black Book says the '92 LT1 weighs ~450 lbs. I don't know if that includes all the accessories or what, though.
Thread Starter
Pro
Joined: Aug 2001
Posts: 683
Likes: 0
From: mississauga ON
Re: LT1 vs LT4 engine weights (LT4Coupe)
Jason, those weights didn't seem right to me either, but most of the
info on the site seems pretty accurate.
http://members.lightstream.net/~rottie/home.htm
(click on 1996 engine options)
------------------------------------------------
info on the site seems pretty accurate.
http://members.lightstream.net/~rottie/home.htm
(click on 1996 engine options)
------------------------------------------------
Team Owner
Joined: Apr 2001
Posts: 22,267
Likes: 3
From: Dallas TX
Re: LT1 vs LT4 engine weights (Zora)
Yeah, no way there is an extra 175lbs .... the biggest difference is the intake, and that's 10-20 lbs max. Things like the roller rockers and larger ports actually REDUCE weight.... those numbers are wrong. Maybe they weighed the LT4 with it attached to the car :p:
[Modified by Glock'94, 11:21 PM 12/1/2001]
[Modified by Glock'94, 11:21 PM 12/1/2001]
Melting Slicks
Joined: Apr 2000
Posts: 3,198
Likes: 2
From: Northern CA
Re: LT1 vs LT4 engine weights (Glock'94)
Either that or some big dude was standing on the scale when they weighed the LT4. :)
The only remote (*very* remote) possibility I can think of is that they weighed an LT1/4L60E together, and then an LT4/ZF6 together. But I bet the tranny weight difference is maybe in the 50# neighborhood, at most. Not 175!!!
The only remote (*very* remote) possibility I can think of is that they weighed an LT1/4L60E together, and then an LT4/ZF6 together. But I bet the tranny weight difference is maybe in the 50# neighborhood, at most. Not 175!!!
Drifting
Joined: Jul 2001
Posts: 1,296
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From: Largo Florida
Re: LT1 vs LT4 engine weights (JasonL)
Here is one source claiming the LT4 is heavier. LT4s have a forged crank. How much weight difference is that?
http://members.lightstream.net/~rott...ineoptions.htm
http://members.lightstream.net/~rott...ineoptions.htm
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Melting Slicks
Joined: Jun 2000
Posts: 3,215
Likes: 6
From: Tampa Florida
Re: LT1 vs LT4 engine weights (ericcer)
LT4's do not have a forged crank-nodular iron. It is specially prepped with undercut fillets, etc though.
I'm sure the numbers are incorrect or one was with the accessories and one was without.
The engines should be nearly identical. I remember the L98 vs LT1 were slightly different mainly due to LT1's going to a cast iron exhaust manifold when the 91 L98 used a SS exhaust manifold-diff of like 20 pounds.
I'm sure the numbers are incorrect or one was with the accessories and one was without.
The engines should be nearly identical. I remember the L98 vs LT1 were slightly different mainly due to LT1's going to a cast iron exhaust manifold when the 91 L98 used a SS exhaust manifold-diff of like 20 pounds.
Racer
Joined: Mar 2000
Posts: 395
Likes: 0
From: Iselin NJ
Re: LT1 vs LT4 engine weights (LT4Coupe)
Easy way to find out I am away from my car right now or I would post weight.Any fellow LT4 er post the weight of the car.Same with a 96 auto.Then we will see.Thanks :cool: :cool: :cool: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused:
Burning Brakes
Joined: Jan 2001
Posts: 964
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From: Cedar Park Texas
Re: LT1 vs LT4 engine weights (No Go)
[QUOTE]LT4's do not have a forged crank-nodular iron. It is specially prepped with undercut fillets, etc though.
Suggest you recheck your data. LT4's have a forged steel crank. LT1's are cast.
Suggest you recheck your data. LT4's have a forged steel crank. LT1's are cast.
Melting Slicks
Joined: Apr 2000
Posts: 3,198
Likes: 2
From: Northern CA
Re: LT1 vs LT4 engine weights (Ed Ut)
Suggest you recheck your data. LT4's have a forged steel crank. LT1's are cast.
"Crankshaft
The crankshafts are cast nodular iron. The LT4 crankshaft journals are under cut and rolled. . ."
Nowhere is there mention of a forged crank.
Melting Slicks
Joined: Jan 2000
Posts: 3,418
Likes: 1
From: NW Chicago Suburbs
Re: LT1 vs LT4 engine weights (Ed Ut)
I am almost positive it is forged. But I could be wrong. I posted the question on the forum. Thanks :cheers:
Did anyone think perhaps the mistake is the extra 200lbs is an LT5, not an LT4? There's no way the LT1 and LT4 have more than 5 lbs difference.
Eric
Race Director
Joined: Nov 1999
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From: Michigan in the summer, Florida the rest of the time
St. Jude Donor '08-'09-'11
Re: LT1 vs LT4 engine weights (LT4Coupe)
I have a copy of GM's 1996 Corvette Specialist's Book, the document used to turn mild-mannered auto salespeople into instant Vette experts! ;)
According to the manual, the weights listed above are correct - page 40 lists the LT1 as 576.4 pounds fully dressed; page 41 lists the LT4 as 743.6 pounds fully dressed. I always thought that was an error...
As far as the cranks, page 42 shows the LT1 as having a "Modular Cast Iron" crank and the LT4 as having a "Forged Steel" crank.
One other interesting tidbit from the book: the rear tread (shown in a diagram as the distance between the centers of the rear tires) on a convertible is 1.5" wider than the coupe. Makes you wonder if the offset for the 9.5" rim is different than the 11" rim? I wouldn't think the suspension and drivetrain parts are unique for the droptop...:confused:
Brad
According to the manual, the weights listed above are correct - page 40 lists the LT1 as 576.4 pounds fully dressed; page 41 lists the LT4 as 743.6 pounds fully dressed. I always thought that was an error...
As far as the cranks, page 42 shows the LT1 as having a "Modular Cast Iron" crank and the LT4 as having a "Forged Steel" crank.
One other interesting tidbit from the book: the rear tread (shown in a diagram as the distance between the centers of the rear tires) on a convertible is 1.5" wider than the coupe. Makes you wonder if the offset for the 9.5" rim is different than the 11" rim? I wouldn't think the suspension and drivetrain parts are unique for the droptop...:confused:
Brad
Melting Slicks
Joined: Jan 2000
Posts: 3,418
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From: NW Chicago Suburbs
Re: LT1 vs LT4 engine weights (GS Ragtop)
Plenty of GM propaganda has typos or is wrong. They print that stuff months before the specs are finalized. If someone really thinks the LT4 weighs 175lbs more than an LT1, please tell what is adding that extra weight. It's not the crank :) Also note the incorrect weight cited for the LT4 just happens to be the weight of the LT5. Hmmm...I wonder... ;)
Eric
Eric
Pro
Joined: Mar 1999
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From: Honolulu Hawaii
Re: LT1 vs LT4 engine weights (silver & red CE)
I've had LT-4 and LT-1 engines (no accessories, with manifolds, no flywheel) air freighted in from the mainland and there was a weight difference of around 25 pounds. I think most of that was in the crating.
The cranks are not forged. I've pulled them out of the engine, and have them on the floor of my shop.
The cranks are not forged. I've pulled them out of the engine, and have them on the floor of my shop.
