LT4 LT-5 vs. LT1 and LT4, weight

[Rob]

Yes, I'll be adding a full specifcations page on the 1990 - 1992 LT5 engine in the ZR-1 Center found in the Model Center above. Right now, I'm doing the same for the 1982 engine and building the 1982 Center for the Model Center.

 

[6 Shooter]

Rob . . .

Anyone know weights of LT-5, LT1, LT4, and LSx?
Just curious.

Sorry if this question has been answered per this thread, but from the info you have gathered, would you put it all together in one blurb?

Thanks,
6 Shooter

 

[Rob]

Here you go:

For the 1996 LT1 and 1996 LT4:

LT1 Mass: 785.3 lbs (356.2 kg)
LT4 Mass: 1003.5 lbs (455.2 kg)

For the 2001 LS1 and 2001 LS6:

LS1 Total Dressed Engine Weight: Auto. - 457.6 lbs. (208 kg); Manual - 497.2 lbs (226 kg)
LS6 Total Dressed Engine Weight: (Manual only) - 497.2 lbs (226 kg)

For the 1989 L98:

Total Dressed Engine Mass (Dry Weight) -

Automatic Trans: 541.2 lbs (245.5 kg)
Manual Trans: 592.2 lbs (268.6 kg)

For the 1990 - 1992 LT5:

Total Dressed Dry Engine Weight: 270.5 KG (596 lbs)

So what we have here is that the L98 and LT5 engines are pretty close in weight. In one of the LT5 engine manuals I have, they state that the LT5 was 39 lbs heavier than the L98. Comparing manual trans L98 to LT5, they are very close.

Since I question how the numbers were obtained for the LT1/LT4, lets remove those from the comparison. In terms of the LS1/LS6 vs. LT5, the LT5 is nearly 100 lbs heavier.

 

[Vettelt193]

no other sources on the LT1 and LT4 weights? I still think the LT4 weight includes the tranny

 

[secondchance]

Thanks Rob, I'm amazed how you can track these info. I have been wondering about these relative engine weight for quite sometime.:cool

 

[6 Shooter]

Thanks Rob !!!

I can't believe the LT4 is that fat/heavy :eek

 

[6 Shooter]

no other sources on the LT1 and LT4 weights? I still think the LT4 weight includes the tranny

Bob,

I got a great idea, what do u think about pulling your LT4 this weekend and weighting it?

6 Shooter

 

[twiget]

I'm pretty sure the numbers for the LT4 are wrong. If there really was a 1,000lb motor in the nose of the car then there is no way the car could acheive a 52.1%/47.9% front/rear weight distribution. Heck, did the big blocks from the 60's and 70's weigh that much?

I made a request on the Grand Sport mailing list to find out what the actual weight of the LT4 is. Hopefully we will know shortly.

Jason

 

[twiget]

According to the 1996 Chevrolet Corvette Specialist Book, the LT1 weighs 576.4lbs dressed and dry. The LT4 weighs 753.6lbs dressed and dry.

The LT1 weight seems to be more accurate, but I doubt the LT4 weighs nearly 200lbs more than the LT1. Perhaps the LT4 weight includes the ZF-6 tranny, as it was the only one avalible with the LT4, and the LT1's weight has no tranny, as it was variable (for every year other than the '96 MY).

Jason

 

[Rob]

Interesting. That was one place I didn't check. Good thinking Jason! Now to find out how much the ZF 6-speed weighs.

 

[Vettelt193]

I have searched all over the internet, and found no weight numbers on the LT4... I couldn't even find shipping weights on LT4 crate engines... Taking the engine out and weighing it doesn't sound like that bad of an idea anymore;stupid

 

[twiget]

Orignially posted by Rob
Interesting. That was one place I didn't check. Good thinking Jason! Now to find out how much the ZF 6-speed weighs.

Not a problem. The ZF-6 weighs ~145lbs wet. Which puts the weight of the LT4 it's self at 608.6lbs. Much closer to the LT1's 576.4 lbs.

Orignially posted by Vettelt193
I have searched all over the internet, and found no weight numbers on the LT4... I couldn't even find shipping weights on LT4 crate engines... Taking the engine out and weighing it doesn't sound like that bad of an idea anymore;stupid

According to one of the guys on the GSR with access to a GMPP catalog, the LT4's shipping weight is 325lbs. The ZZ4 is listed at 478lbs, and the 454 and 502 motors are listed at 712lbs.

I'm :confused. 325lbs is not even close to the 608.6lbs I've got above. I've always heard that the LT5 was much heavier and larger than any of the other motors put in the C4, which is why it's not considered a true small block. At 631.2lbs, the LT5 is right in there with the listed weights of the big boys (the 454 and 502) but not even 30lbs more than the LT4?

I dont know about you, but given the info above, I think the 325lbs listed in the GMPP catalog is the most accurate one, which begs the question, how heavy is the LT1?

Jason

 

[Rob]

:L :L :L :duh :duh I give up! LOL

 

[6 Shooter]

I have searched all over the internet, and found no weight numbers on the LT4... I couldn't even find shipping weights on LT4 crate engines... Taking the engine out and weighing it doesn't sound like that bad of an idea anymore;stupid

Don't do it tonight, wait till this weekend, u'll have a bit more time that way.

 

[XS650]

For the 1996 LT1 and 1996 LT4:

LT1 Mass: 785.3 lbs (356.2 kg)
LT4 Mass: 1003.5 lbs (455.2 kg)

For the 2001 LS1 and 2001 LS6:

LS1 Total Dressed Engine Weight: Auto. - 457.6 lbs. (208 kg); Manual - 497.2 lbs (226 kg)
LS6 Total Dressed Engine Weight: (Manual only) - 497.2 lbs (226 kg)

If anyone can find legitimate documentation showing the mass/weight of the L98 and LT5 engines, let me know and I'll update the Specification pages.

Small block Chevys have typically run between 530 and 600 lb since 1955. sometimes less with a lot of aluminum. No way either of those engines weighs 785 lb, let alone 1003 lb.

A bleeping big block Chevy is only about 700 lb.

Here's an interesting list of engine weights, it doesn't answer the question at hand but helps put things in perspective.

http://www.bacomatic.org/~dw/engfyi.htm

Dave's whole web site is kind of interesting.

 

[ZR1 MK]

My 1990 ZR1/LT5 training tape states LT5 is 39 lbs heavier than L98. Other sources (Corvette Quarterly) spec the following, which doesn't coincide with the GM tape information.
L98 431 lb
LT1 452 lb
LT5 602 lb
LT1 501 lb (my 1970 Z28 engine measured by me)
Mike

 

[Hib Halverson]

Whomever is the contact at GMPT is wrong on the weights of the Gen 2s. The Specialist book is wrong, too.

LT1 and LT4 for 1996 had virtually the same weight.

 

[EricVonHa]

I agree with the statement that the LT1/4 motors are damn near the same weights. What is really different there? Not a whole lot when it comes to actual parts. There is nothing extra on the LT4 over the LT1... manifolds are a little different and the heads have some different geometries, but other than that.. they should be within 5 pounds of each other. It's important to compare all of these specifications "with accessories" or "without"...

 

[vettered91]

LT1 and LT4 for 1996 had virtually the same weight.

Now this makes sense to me!