| Author | Message | ||
     eric johnson (Eric) New Member Username: Eric Post Number: 3 Registered: 03-2003 |
I'm rebuilding my '90 3.9 and looks like I will get a 4.0 short block. 1) Who has the best price on factory short blocks? 2) What modifications do I need to have done on the 4.0 block and crank so it will work with the 3.9 parts? 3) If the 4.0 block has 9.3 CR pistons and I will use the thicker composite gaskets, BUT reuse my 3.9 heads, with the larger combustion chambers, will my CR end up around 8.3? 4) If I get a 4.0 short block and the crank needs disassembly,machining,and re-assembly - it STILL may be less expensive to get new 3.9 +.020 9.3 CR pistons and go that route. 5) Will 3.9 9.3 CR pistons cause problems with the valves if I'm using a cam with .450 valve lift (Isky) but also using the thicker composite gasket. Thanks for any advice you folks can supply eric | ||
| Nick Hall (Ngh) New Member Username: Ngh Post Number: 5 Registered: 01-2003 |
I believe this site will help. http://www.ajmac.co.uk/v8-swops.htm#Distributors. | ||
| LEON KEDZIERSKI (Rovertech) New Member Username: Rovertech Post Number: 28 Registered: 12-2002 |
THE 4.0 IS STILL 3.9 BUT RELABLED. IT HAS A BIGGER DIAMETER MAINS AND IT IS CROSS BOLTED AT THE MAINS. YOU CAN USE ALL OF YOUR EXTERIOR PARTS FROM YOUR 3.9 BUT YOU WILL NEED TO CUT NOSE OF CRANK SHORTER(RPI MAKES A SPACER)IF YOU WHAT TO USE YOUR TIMING CASE AND DISTRIBUTOR.TREVOR GRIFFITHS AND I JUST REWORKED AND INSTALLED A 4.6L IN PLACE OF HIS 3.9L IN HIS 95 DISCO AND IT IS SWEET! KEEP WHEELING LEON | ||
| J E Robison Service Co (Robisonservice) Member Username: Robisonservice Post Number: 83 Registered: 10-2002 |
As Leon said, you need to shim or cut the crank end, or use the crank from the old motor. More important - buy a 4.0 block for a 2001MY DII, it costs half as much as the earlier blocks - about $1,300 from Land Rover dealers in the US. John www.robisonservice.com | ||
| John Cinquegrana (Johnc) Senior Member Username: Johnc Post Number: 429 Registered: 07-2002 |
Leon, did you have to rechip the ECU? Thanks, John C. | ||
| A. Ali (Alia176) New Member Username: Alia176 Post Number: 38 Registered: 03-2003 |
Last I heard, Trevor was waiting for his transmission to get rebuilt. I too am curious how the whole project is shaping up. | ||
| Bill Bettridge (Billb) Senior Member Username: Billb Post Number: 752 Registered: 02-2002 |
Ali - Trevor is all done and has been driving for a bit. Goes pretty well and sucks petrol to match!  Bill | ||
| LEON KEDZIERSKI (Rovertech) New Member Username: Rovertech Post Number: 29 Registered: 12-2002 |
FOR ROBINSON SERVICE YOU CANNOT USE 3.9 CRANK IN 4.0 CROSS BOLTED BLOCK.THE MAINS ARE BIGGER IN THE 4.0 TREVORS TRUCK IS DONE. ENGINE MACHINE WORK BY MANCINI MACHINE,CAM BY PIPER FROM RPI WEB SITE,4.2L CHIP IN ECU. TRANS OVERHAULED BY BOB KURLAND OF WESTMINSTER FIRST TIME OUT IT BROKE AN AXLE ON SOME ROCKS. (TOO MUCH POWER?)IT NOW HAS GREAT BASIN AXLES. DROP HIM A LINE,WE HAVE SOME PICS OF THE ENGINE. | ||
| Brian Stolpa (87hprover) New Member Username: 87hprover Post Number: 15 Registered: 02-2003 |
I have a 4.0 block in my 87 classic, I made a shim and while I was at it made a bunch extra as long as I was using the lathe might as well I figured if anyone would like to purchase them let me know |
