LT4 LT1,LT4,LS1,LS6.... Whats the difference?

[Twin_Turbo]

You will need an F-body tranny.

IT has been done, even to C3's.

http://www.acp-euskirchen.de

Look in Bildergalerie (pic gallery)


Marck

 

[Tonylong]

I'd like to echo what Johnny asked:
Can I upgrade my '89 L98 to reverse flow ?
I'm talking about a mininal upgrade, wothout all the refinements such as dry manifold, and etc.
just the basics of cooling the heads first, then the rest.

 

[johnny]

TonyLong,

I have mention this at my enginespecialist, He wil look at it. To see if it's possible. He is a carengineer and was very interested. If there is a way, he will find it.

And I will do it.

 

[Twin_Turbo]

It can't be done! The complete cooling system is different, the channels in block & heads are way way different.

The reverse cooling is only there to make it possible to run higer compression!

You can run higher comp. in a different way too! use Alu heads w/ coated chambers, coated piston tops & possibly coated exh ports.

You can even do it yourself! I think techline coatings has the stuff you need!

Marck

 

[Tim Scales]

A History of "The Engines"

The L98 was introduced in its first version in a C4 in 1985. It retained the same set up until 90 or 91 when Aluminum heads were offered on the Iron block engine which increased the Torque and HP. In 1992 the first LT1 was introduced with Iron Block and Aluminum heads. The LT1 had the "Dreaded "Opti-spark" Ignition system. The Hp was supposed to be factory fresh 300....the first US 300 HP since the late 60's to early 70'.
The LT1 set up was basically the same through the 96 model year with a few exceptions...ie, improved optispark, OBDII Introduced. The LT4 was put in "Limited Edition 96 Grand Sport models of which only 1,000 were made to the best of my knowledge. The major difference between the 1 and 4 was the Intake, Camshaft and possibly exhaust.
In 97 the C5 was "Born" with the FIRST all aluminum "LS1" Engine. The LS6 is an upgraded version of the LS1...different heads, intake, cam etc.
The NEWEST and MOST powerful in a stock Vette is the C6 2005 version with LS2. She is to put out 400 BHP and aprox 400 ft. lbs of torque. All of the "LS" versions are "All Aluminum" meaning the engine block, heads, intake are made of lighter weight aluminum material.
Many years ago people were "Shy" of an aluminum engine due to some "Bad happenings". I am under the impression these "Bugs" have been eliminated with very little problems with the new generation LS1, 6 and 2.
Hope this clears the issue for you a bit. Tim

I know that all these engines exist and I know what in essence they do but what is the difference between all of them?

It leads to some confusing times when I am reading literature or the web.

sscam69

 

[Vettefan87]

The L98 was introduced in its first version in a C4 in 1985. It retained the same set up until 90 or 91 when Aluminum heads were offered on the Iron block engine which increased the Torque and HP.....

Aluminum heads were introduced in late 86 for the coupes, and all the convertibles had them too in 86. from there on I believe every year there was a little differnece in the L98 to bump up the horse a little every year.



Justin

 

[code5coupe]

The LT1 was a totaly different engine then the "classic" Chevy small block. Think the only major part that is interchangable is the crankshaft. It is basicly an orphin engine, was built for a little over 5 years, used in the Vette only 5 years and then some in trucks. Then the focus switched to the new LS1, which again was a totaly new engine with no interchangble major parts.

The LT1/4 was not a totaly different engine. In fact, other than reverse flow cooling, and a front-mounted distributor, it was the same engine as those preceeding it. It would be more accurate to describe it as an evolvment; small changes had been made to the 1955 V8 all along, and the LT engines were just the last step in its evolution.
The LS-series of small blocks WAS totally different; aluminum block, different head design, no interchangeable parts.
Trivia: the LT was no orphan; it was available in full-sized sedans (Impala SS) and in the Camaro as well as the Corvette. It was the last of the classic small-block Chevy V8's ...and maybe the best.

 

[aboatguy]

The LT1/4 was not a totaly different engine. In fact, other than reverse flow cooling, and a front-mounted distributor, it was the same engine as those preceeding it. It would be more accurate to describe it as an evolvment; small changes had been made to the 1955 V8 all along, and the LT engines were just the last step in its evolution.
The LS-series of small blocks WAS totally different; aluminum block, different head design, no interchangeable parts.
Trivia: the LT was no orphan; it was available in full-sized sedans (Impala SS) and in the Camaro as well as the Corvette. It was the last of the classic small-block Chevy V8's ...and maybe the best.

I believe what he meant by (LTX) totally different engine is even the block is not interchangeble with the Gen I engines.

Mike

 

[dwsjr50]

Aluminum Heads

I downloaded a copy the RPO codes yesterday posted by JonM on 9-29-03. The RPO KB2 is the code for Cast iron cylinder heads. Were cast iron heads
special order for the L-98. My build sheet does not show this code so I must have the aluminum heads.

 

[Texas Gunslinger]

The reverse flow cooling system was first devised by none other than Smoky Yunick back in his NASCAR days. Something like the 1960s when all the big three were at it hard and heavy! Just saying is all!