Results 1 to 6 of 6

Thread: Tatra T815 engine swap

  1. #1
    Private
    Join Date
    Jul 2013
    Location
    Edmonton, Canada
    Posts
    11
    Thanks
    9
    Thanked 2 Times in 2 Posts

    Default Tatra T815 engine swap

    Hello! First post is a strange question for mechanically inclined Tatra owners. I'm considering buying a late eighties 6x6 815 TP directly from Eastern Europe. I would like to take out the giant air cooled V12 and put a shorter NA diesel (I have my eye on a 6CTA 8.3L Cummins, suggestions welcome), manual Allison transmission, etc. At the same time I would like to move the cab back and shorten the front to improve the approach angle. I've spoken to a couple heavy duty diesel shops around Central Alberta, and was reassured that it is very doable with the right amount of cash. On the other hand, I'm concerned about the fact that I haven't found a single mechanic who has worked on a Tatra, one guy saw an 8x8 once, lol. I want to get some opinions from people with actual Tatra experience, as to whether this endeavor is worth undertaking to begin with, if anyone has swapped an engine out, or frankly anything related to Tatra's. Thank you beforehand.
    - Paul

  2. #2
    General
    Join Date
    Feb 2009
    Location
    Netherlands
    Posts
    550
    Thanks
    33
    Thanked 46 Times in 29 Posts

    Default

    Swapping the engine is a piece of cake (with the right tools, money and time). Why you would want to is beyond me, a 19 liter v12 turbo is beautiful.

    Swapping the gearbox is a completely different story, it's mated to the drivetrain, this will require some serious engineering.

    Shortening the frame during the engine swap is a nice idea, but you will run into a few interesting problems. The reason the overhang is so long is to allow the engine to sit low inside the frame for better weight distribution and a lower profile of the overall truck. If you move the engine back, it has to be moved up as well, because the steering rods, booster and front diff will be in the way and moving those is not a feasible option. When you move the engine up, be aware that the crosspin on the gearbox input shaft doesnt allow much more vertical play than it originally has.

    Lastly, when you shorten the frame, you need a different cabin, find a new spot for the steering column, and so on....

  3. #3
    Private
    Join Date
    Jul 2013
    Location
    Edmonton, Canada
    Posts
    11
    Thanks
    9
    Thanked 2 Times in 2 Posts

    Default

    Thank you for the info Duncan.
    I've spoken to IPEX Tatra as a potential service/modification facility for the truck and this is what they said:
    - they advised against any kind of frame shortening/cab relocation
    - Re-powering the truck with a more modern V8 Tatra turbocharged engine would cost around 30K Euros (includes the necessary drivetrain upgrades to make the top speed 120km/h)
    Even with the new engine the truck would burn 40+ liters/100km at 100 km/h speed...Wow, that would be the truck to take to an Earth Day rally or something alike, lol

  4. #4
    Moderator cranetruck's Avatar
    Join Date
    Jan 2005
    Location
    Meadows of Dan, Virginia
    Posts
    10,375
    Thanks
    118
    Thanked 984 Times in 597 Posts

    Default

    You know 40l/100km isn't all that bad, a typical 5-ton burns that kind of fuel (approx 6 mpg)...although most won't run that fast.
    Bjorn

    Avatar: XM757 in OK prepared for 1,000 mile trip home. Part of 6,000 mile journey in 2006.

    1969 Ford XM757 8x8, 5-ton Pershing 1A truck tractor...the "improved MV".

    "Some things can't be made better, just differently......a lot of things actually"

  5. #5
    Private
    Join Date
    Jul 2013
    Location
    Edmonton, Canada
    Posts
    11
    Thanks
    9
    Thanked 2 Times in 2 Posts

    Default

    Well, it just came as a surprise that the 40+l/100 km was the fuel consumption rate out of the newer fuel efficient engine. To my understanding I should be getting closer to 10mpg with a 8.3L Cummins after upgrading certain components. Correct me if I'm wrong please.

  6. #6
    General
    Join Date
    Feb 2009
    Location
    Netherlands
    Posts
    550
    Thanks
    33
    Thanked 46 Times in 29 Posts

    Default

    It's not just the efficiency of the engine. The amount of gearboxes, differentials, hub reduction, tires, etc are the big impact on the fuel consumption.

Similar Threads

  1. Replies: 23
    Last Post: 06-10-2011, 01:04
  2. Replies: 3
    Last Post: 05-22-2011, 19:51
  3. engine swap
    By qonos in forum CUCV
    Replies: 7
    Last Post: 05-10-2011, 23:18
  4. Replies: 7
    Last Post: 01-13-2007, 20:40
  5. Engine Swap
    By hayshaker in forum The Deuce
    Replies: 14
    Last Post: 03-15-2005, 11:43

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •