Results 1 to 4 of 4

Thread: Upgrade 2.25 to 2.5, what do I need?

  1. #1
    Join Date
    Dec 2018
    Location
    Encinitas, CA
    Posts
    11

    Default Upgrade 2.25 to 2.5, what do I need?

    I got a 2.5L petrol motor from a friend in excellent condition to replace my tired 2.25 in a Series 2. Does anyone know what i need to finish it off? I want to keep my Series gearbox though I do have the LT77 that came with the 2.5 from 1985 Defender. I assume I can use my 2.25 flywheel and clutch (though I will replace the disc at a minimum) so I can use the Series throw out bearing. I also think I can use the thermostat housing so I can use my Series radiator since the Defender radiator has a different hose position. I know I need to switch to an electric fuel pump as the 2.5 doesn't have a spot for a mechanical pump.

    Are there other things I am not thinking about? I want to have everything as ready as possible to do the engine swap. The wisdom of the forum would be appreciated.

  2. #2
    Join Date
    Dec 2010
    Posts
    116

    Default

    I have a similar issue, hopefully some answers will be forthcomming, otherwise we'll have to learn new dog tricks.

  3. #3

    Default

    I am not 100% sure but I believe you need to keep the 2.5 flywheel and fit a 2.25 9.5 inch Diaphragm spring, series 2A clutch complete, that will match up with the release bearing in the S2 gearbox . If you have the twin choke carb. on the 2.5 it will need a recirculatory fuel system with a feed back to the tank , similar to the diesel. I fitted a Diesel 2.5 in place of a 2.25 and did as you suggest fitted the 2.25 thermostat housing to keep the Series radiator. This also enabled the heater on/off valve off the Series to be used , as the Defender uses an air blend heater with coolant circulating through it all the time.

  4. #4
    Join Date
    Dec 2018
    Location
    Encinitas, CA
    Posts
    11

    Default

    Thanks for the info. I was thinking the same on the clutch. The Weber carb is a 32/34 DMTL which I don't think has a fuel return, but I will have to get an electric fuel pump. This carb has an electric choke and anti run-on valve which I assume just connect to a positive, keyed lead like the coil. If anyone can think I what I am missing I would appreciate it. I bought the engine for the upgrade and to make it a swap so I am not down for long. I am also going to get the head milled to go from 8:1 to 9:1.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
About us
Unparalleled product knowledge. Our mission is to support all original Land Rover models no longer supported by your local Land Rover franchise. We offer the entire range of Land Rover Genuine Parts direct from Land Rover UK, as well as publish North America's largest Land Rover publication, Rovers Magazine.
Join us