Go Back   LS1TECH > LS1-LS2-LS3-LS6-LS7 PERFORMANCE > Generation III Internal Engine
Sign in using an external account
Register Forgot Password?
Register iTraderTimeslips Photos Members Search Today's Posts Mark Forums Read Used CarsVendor Directory
Search

Generation III Internal Engine
1997-2006 LS1 | LS6
Sponsored by
Texas Speed & Performance

Welcome to LS1Tech.com!
Welcome to LS1Tech.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join LS1Tech.com today!


Reply
 
Thread Tools Search this Thread
Old 07-24-2009, 05:14 PM   #1
TECH Regular
Garage is empty, add now
 
1969mach1's Avatar
 
Trader Rating: 0
Join Date: Jan 2008
Location: Houston, TX
Posts: 459
Default 8.1L Chevy motor

Mods, please move if it not in the right spot.

The Chevrolet 8.1 liter engine was produced from 2001-2006 and installed in HD 2500 and larger trucks and vans, as well as motor homes, Suburbans and
Avalanches.

Does anyone know much about this motors?
I can pick one up for a couple hundred dollars out of a wrecked 2003 HD2500.
__________________


2001 Z28 A4 / PatG custom cam / Comp 918 springs / TSP pushrods / ported oil pump / LS2 chain/ Edelbrock step LT's / Circle D 3200 / SLP lid / Flowmaster catback / UMI LCA's / UMI PHBar / 3.73 gears
1969mach1 is offline   Reply With Quote
Old 07-24-2009, 05:42 PM   #2
On The Tree
Garage is empty, add now
 
Trader Rating: 0
Join Date: Mar 2009
Posts: 100
Default

They are 375hp and 495 torque Factory so thats pretty good. If you tune them put a good exhaust and cold air I am sure they would be 400hp and well over 500 torque. I am not sure about the Aftermarket fo them but I do believe the block is based on a tall deck big block of old, thats what i have read anyways. They have the same bolt pattern bellhousing as any sbc does or bbc. I Have one at work with 245,000 oilfield miles in a one ton 2001 chevy and it still runs good. It gets about 10 mpg in a 12,500 pound truck thats always loaded to that weight. Surprisingly the only problem is that one of the mounting ears on the tranny which is the allison broke where the transfercase mounts to it but thats about it. I also had to do a cam sensor a while ago but nothing major. I think it is a solid engine but not sure about the aftermarket. How many miles on the motor?
cdwood388 is offline   Reply With Quote
Old 07-24-2009, 05:45 PM   #3
TECH Senior Member
2000 Chevrolet Camaro
My Garage
 
NemeSS's Avatar
 
Trader Rating: 122
Join Date: Sep 2005
Location: Houston,TX
Posts: 6,612
Default

it seems like hi mileage 8.1 come apart when hi perf. parts are swapped in,
it is not uncommon for the pistons to break ringlands.
__________________
NemeSS is online now   Reply With Quote
Old 07-24-2009, 06:14 PM   #4
TECH Regular
Garage is empty, add now
 
1969mach1's Avatar
 
Trader Rating: 0
Join Date: Jan 2008
Location: Houston, TX
Posts: 459
Default

it there much in the aftermarket for these. is it worth building?
__________________


2001 Z28 A4 / PatG custom cam / Comp 918 springs / TSP pushrods / ported oil pump / LS2 chain/ Edelbrock step LT's / Circle D 3200 / SLP lid / Flowmaster catback / UMI LCA's / UMI PHBar / 3.73 gears
1969mach1 is offline   Reply With Quote
Old 07-24-2009, 06:29 PM   #5
TECH Enthusiast
Garage is empty, add now
 
vipvegas's Avatar
 
Trader Rating: 13
Join Date: Aug 2006
Location: Pensacola, FL
Posts: 592
Default

1969mach1 I have one for sell out my wrecked 2003 Hd with less then 20000 miles if you need one.. Clean motor never saw and upgrade.
vipvegas is offline   Reply With Quote
Old 07-24-2009, 07:46 PM   #6
KCS
TECH Junkie
Garage is empty, add now
 
KCS's Avatar
 
Trader Rating: 17
Join Date: Mar 2005
Location: The Woodlands, TX
Posts: 3,992
Default

I'm wondering why the f*** these things don't have as much aftermarket support. It is almost literally a 496ci, canted valve LS1. They have cathedral ports like the LSx engines, but it's not an inline valve head. There is no conventional distributor, but I hear it has an ignition like an LT1...

I'm trying to get my hands on a set on one and see what I could do. Aftermarket or not, I'd bet you can make an EASY 600whp on pump gas with the iron heads, unless they are just absolute junk. Wild card would probably be the intake, but I hear the marine industry (Arizina Speed & Marine) has something for them.
__________________
2000 Pontiac Trans Am - 412whp/433ft-lbs
376ci Iron Block - New Heads In Progress

Last edited by KCS; 07-24-2009 at 07:55 PM..
KCS is online now   Reply With Quote
Old 07-24-2009, 07:51 PM   #7
TECH Addict
Garage is empty, add now
 
Trader Rating: 6
Join Date: Aug 2006
Location: Schiller Park (NW burb of Chicago)
Posts: 2,311
Send a message via AIM to GreenBlood
Default

this would certainly be an interesting build. if i had money, i'd try it out, but that just isn't in the cards for me.
__________________
2006 PBM GTO...AEM intake, Drilled/Slotted Rotors, C6 Motorsports, and a full 2.5 in H pipe catback with Spintech Super Pro Streets...
GreenBlood is offline   Reply With Quote
Old 07-24-2009, 10:10 PM   #8
TECH Fanatic
2001 Chevrolet Camaro
 
MelScrilla's Avatar
 
Trader Rating: 2
Join Date: Mar 2009
Posts: 1,139
Default

i would like to see someone build one, but it would be like a boat anchor in the front of most cars. to offset the weight you would have to make some serious power becasue people complain about the extra 88 pounds a iron block adds over the aluminum.
__________________
01 Z28- Magnaflow catback, A4, 4:10's, SLP Lid, more power coming soon......

94 Integra - daily driver

New Project: 275 Fox.......Details still in the works
MelScrilla is offline   Reply With Quote
Old 07-25-2009, 12:26 AM   #9
TECH Fanatic
2001 Chevrolet Camaro
 
hammertime's Avatar
 
Trader Rating: 1
Join Date: Apr 2006
Location: Smithton, IL
Posts: 1,413
Default

Speaking of "boat anchors"

http://www.hotrod.com/newproducts/hr...ine/index.html

The automotive aftermarket is more comfortable building Gen IV and Gen V BBC engines. For the most part, only the Marine aftermarket has forged ahead with developing the 8100 engines. There, you don't have the tall-deck clearance concerns. Also, a bit of boost can overcome the shortcomings of an OEM cylinder head until demand warrants aftermarket support for the unique design.

With most of the truck tuners embracing diesel performance, the 8100 has been left behind.
__________________
Quote:
Originally Posted by Tony Mamo @ AFR View Post
For a street or street/strip car which most of are driving, I'll take a more efficient, high flowing "smaller runner" cylinder head any day of the week and twice on Sunday.
Links to head porting info
hammertime is offline   Reply With Quote
Old 07-25-2009, 09:12 AM   #10
Moderator
1999 Pontiac Trans Am
 
Paul Bell's Avatar
 
Trader Rating: 9
Join Date: Nov 2005
Location: NYC
Posts: 5,177
Default

Plenty of stuff here:

http://www.raylarengine.com/index.html
__________________
-MEDIUM BLUE METALIC 1999 Trans Am A4, 3.42 rear, Moser axels, Racetronic pump & wiring, LS6 intake manifold, ZR1 9's & 11's, SSBC 13" 4 piston friction, truck coil conversion, PCMforless tuned, Magnaflo stainless cat-back.
-71 Monte Carlo SS454 496 CID, 600HP
Paul Bell is offline   Reply With Quote
Old 07-25-2009, 10:33 AM   #11
TECH Apprentice
Garage is empty, add now
 
LTLRDSS's Avatar
 
Trader Rating: 2
Join Date: Feb 2007
Location: venice/sarasota fl
Posts: 369
Default

heres a page from a diesel form im on

http://www.dieselplace.com/forum/sho...d.php?t=296939

i think its everything you want to know about the 8.1. theres a guy on the sight doing a cam install on his 8.1, ill read up on it and post that thread if it helps.
__________________
red 1998 camaro ss

LTLRDSS is offline   Reply With Quote
Old 07-25-2009, 10:33 AM
LS1Tech
Pontiac Firebird




Paid Advertisement
Reply

Tags
2003, 81, 81l, allison, chevy, crank, engine, gm, hd2500, head, liter, motor, porting, recall, sensor


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off



All times are GMT -5. The time now is 03:32 PM.


Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.5.2
Advertising - Terms of Service - Privacy Statement - JOBS
Emails & Contact Details