Notices
Conversions & Hybrids LSX Engines in Non-LSX Vehicles
Sponsored by:
Sponsored by:

4.8L crank into L33 5.3L Aluminum Block

 
Old 01-02-2019, 01:48 PM
  #1  
Teching In
Thread Starter
 
Join Date: Jan 2014
Location: Houston, Texas
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Arrow 4.8L crank into L33 5.3L Aluminum Block

Hello to all LSX engine builders and awesome wizards of the engine building world! I have an ambition of building a LSX S10/Sonoma, with regards to building the engine first.

My Idea: Take a 4.8L crank and apply it to a L33(or similar) aluminum block for the least amount of weight and the smallest engine displacement for the best MPG to make a fun small truck daily driver and highway cruiser.

Goal: 25+mpg(30 if possible) highway and 300HP/300TQ (would be willing to lose a bit for better MPG) with full accessories A/C, P/S etc

Target Vehicle: 2000-2003 Chevy s10 or GMC Sonoma

My Questions: 1) Is this possible?
2) Is this worth the trouble and $ of changing the crank?
3) From an engine builder's perspective what would you recommend?

Thank you for your assistance

Daniel


DanCannon27 is offline  
Old 01-02-2019, 02:17 PM
  #2  
Restricted User
 
Join Date: Mar 2014
Location: Ohio
Posts: 6,724
Likes: 0
Received 0 Likes on 0 Posts
Default

The 4.8 doesn't really get better mile than the 5.3. Shorter stroke does strange things for efficiency. I don't feel that its worth the hassle.
JoeNova is offline  
Old 01-02-2019, 02:22 PM
  #3  
Teching In
Thread Starter
 
Join Date: Jan 2014
Location: Houston, Texas
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Default

Ok thanks for the input. All 4.8L are iron blocks and with the 4.8L crank in the aluminum L33 (100pounds lighter) I figured the weight alone would give it a boost in economy.
DanCannon27 is offline  
Old 01-02-2019, 02:32 PM
  #4  
Restricted User
 
Join Date: Mar 2014
Location: Ohio
Posts: 6,724
Likes: 0
Received 0 Likes on 0 Posts
Default

100 lbs vehicle weight reduction might be good for a very very slight increase in mileage.
JoeNova is offline  
Old 01-02-2019, 03:04 PM
  #5  
TECH Apprentice
 
Join Date: Sep 2008
Posts: 370
Likes: 0
Received 0 Likes on 0 Posts
Default

I would just go with an alum 5.3. Small cam. Gear it right. Make sure the tune spot on for 87 octane gas. I bet you would get 25 mpg 60 mph easy. My 15 Silverado crew 4x4 with a 6.2 knocks down 21-22 mpg at 60 mph on a regular basis. But it requires 91 Octane gas.
LS1 TJ is offline  
Old 01-02-2019, 03:44 PM
  #6  
TECH Senior Member
iTrader: (7)
 
Project GatTagO's Avatar
 
Join Date: Mar 2003
Location: The Druid City
Posts: 7,655
Likes: 0
Received 0 Likes on 0 Posts
Default

I would keep it 5.3L (gen 3 go gen 4 aluminum blocks), keep the stock cam and intake. That will get you the best mileage. With the stock cam you want to gear it so that it goes down the highway around 1600-1800rpm at 75mph. This is generally fast enough for a road trip and with stock cam and intake these engines are very happy there.

Andrew
Project GatTagO is offline  
Old 01-02-2019, 03:47 PM
  #7  
Teching In
Thread Starter
 
Join Date: Jan 2014
Location: Houston, Texas
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Default

Ok good info guys thank you. I am a previous owner of a 1998 Camaro SS 6spd manual (Aluminum block LS1: 5.7L) and I was amazed that I was able to achieve 27/28mpg on highway cruising at 70mph.

This ambition came from a theory of a lighter vehicle and smaller displacement. I have also thought of using an electric water pump to get another slight boost in MPG.
DanCannon27 is offline  
Old 01-02-2019, 03:51 PM
  #8  
TECH Senior Member
iTrader: (7)
 
Project GatTagO's Avatar
 
Join Date: Mar 2003
Location: The Druid City
Posts: 7,655
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by DanCannon27 View Post
....

This ambition came from a theory of a lighter vehicle and smaller displacement. I have also thought of using an electric water pump to get another slight boost in MPG.
Your trading solid reliability for questionable gains...not something I would mess with for maybe .001mpg.

Andrew
Project GatTagO is offline  
Old 01-02-2019, 03:54 PM
  #9  
TECH Veteran
iTrader: (22)
 
truckdoug's Avatar
 
Join Date: Nov 2013
Location: Portlandia
Posts: 4,830
Likes: 0
Received 0 Likes on 0 Posts
Default

4th gens got good mileage because they had a very low drag coefficient

same motors, trans and gears in even a small pickup like an s10 is gonna lose ~10mpg at 70mph
truckdoug is offline  
Old 01-02-2019, 04:05 PM
  #10  
TECH Fanatic
 
Michael Yount's Avatar
 
Join Date: Jun 2015
Posts: 1,936
Likes: 0
Received 4 Likes on 2 Posts
Default

Routine 19-21 mpg city, 25-27 mpg highway in a 3200 lb (w/me in it) brick powered by stock 6.2 LS3. The weight savings will do virtually nothing for highway mileage; might help a hair around town. Stock 5.3L should get you close to your goal if geared properly and not running 80+ mph.
Michael Yount is offline  
Old 01-02-2019, 04:14 PM
  #11  
TECH Fanatic
 
Join Date: Oct 2016
Location: PDX-OR-USA
Posts: 1,183
Likes: 0
Received 0 Likes on 0 Posts
Default

What if,, or Why not just use the new 4.3? 300ish HP and all aluminum.. and they are surprisingly cheap. (Who wants a V6? LOL)
Gen 5 tech, no relation to the Pre-2014 4.3 and it fits in the hole.. I've been wondering how it would handle a single turbo..
The full size quad cab rental Silverado with me rodding it to Montana and back form Oregon, it got about 20 at 85 on the freeway,
mid 20's at 55/60 Has a nice growl, and might have taken the Silverado to about 100 fairly easily.
pdxmotorhead is offline  
Old 01-03-2019, 10:50 AM
  #12  
TECH Resident
 
Join Date: May 2004
Location: SoCal
Posts: 778
Likes: 0
Received 0 Likes on 0 Posts
Default

You'll need the 4.8 crank, rods, and pistons (flat top) in order to maintain the correct deck/compression ratio. No special parts or machining required.
Andy1
Andy1 is offline  
Old 01-07-2019, 02:52 PM
  #13  
TECH Regular
 
Join Date: Dec 2004
Location: Florida
Posts: 477
Likes: 0
Received 0 Likes on 0 Posts
Default

I did this. I could only find a bare l33, all the completes at the time were more than i wanted to pay. so i bought a 4.8 and swapped the guts into the l33. i chose a 4.8 donor for the economy.
it worked fine but eventually i switched to a 5.3. i agree the 4.8 isnt worth it for the economy, if all you can get is a 4.8 for whatever reason thats fine, but a 5.3 is better in my experience.
TrendSetter is offline  
Old 01-07-2019, 02:54 PM
  #14  
TECH Regular
 
Join Date: Dec 2004
Location: Florida
Posts: 477
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by truckdoug View Post
4th gens got good mileage because they had a very low drag coefficient

same motors, trans and gears in even a small pickup like an s10 is gonna lose ~10mpg at 70mph
i saw 18-19 mpg best case in my s10 with a bed cover, t56 in 6th gear on the highway. motor was 4.8 with a tu0 cam(216/216). it lit them up in 4th at any speed once boost came on though
TrendSetter is offline  
 


Thread Tools
Search this Thread

About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: