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Author Topic: 8.1L reviews  (Read 2181 times)

RPF207

  • 3500HD Driver
  • ****
  • Posts: 249
  • Age: 31
  • Location: Maine
8.1L reviews
« on: November 16, 2014, 08:01:51 PM »
Looking to hear some opinions on anyone's 8.1 they have in their 3500hd. I'm looking to get one soon hopefully and would like to know how they tow and about their reliability. I already know why they consume oil and that they get about 10mpg haha. Also maybe some info on where to gather parts for the 4x4 conversion from. Thank you!!
1999 chevy HD 4x4 135.5" 6.5 nv4500 bw4470 Dana 70 HP 10 lug front

Due to recent budget cuts the light at the end of the tunnel has been turned off

someotherguy

  • 3500HD Hero
  • *****
  • Posts: 944
  • Age: 49
  • Location: Texas
Re: 8.1L reviews
« Reply #1 on: November 17, 2014, 03:21:46 PM »
If you search posts by member AVERY he's done some digging into several 8.1's and he may have found a solution for the oil consumption.  There's a vent in the bottom of the intake that goes down into the lifter valley; on newer models it's got a bend in it that seems to keep it from sucking oil up.

As far as how they tow?  Like a freaking monster.  This is what these engines were made for.  Depends on what you're gonna tow though...if you're talking loaded down 40' gooseneck?  Better look at converting to a Cummins.

Richard
06 Silverado ISS / 06 Silverado SS / 06 300C SRT8

repacs0103

  • One Ton Driver
  • **
  • Posts: 51
  • Age: 39
  • Location: Flint, MI
Re: 8.1L reviews
« Reply #2 on: November 21, 2014, 11:33:51 AM »
I don't have experience with an 8.1 in a 3500Hd, but we have one at work in a 2500HD pickup that we've owned since new.  155,000 on it now and still going strong.  It pulls very well, but I agree, not like a diesel.  10mpg is a pipe dream, though.  Our pickup weighs in around 5800# and has a 4.10 with the Allison and the absolute best we've ever seen is about 9, we average 5.  In an HD I'd expect an average of 4 or 5.
Rob
95 C3500HD Plow Rig 6BT/Fuller 6M

GM Guy

  • 3500HD Driver
  • ****
  • Posts: 240
  • Age: 29
  • Location: NW. KS to S. ID
  • manual transmission 2wd enthusiast
Re: 8.1L reviews
« Reply #3 on: December 23, 2014, 03:44:32 AM »
a neighbor has one in a 05 K2500HD. he says that at 75 mph it gets 5 mpg. doesnt matter if its empty, or the sail of a 26 foot enclosed trailer loaded down. :)

He loves the truck and wont be trading any time soon.

 


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