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JOW240725 Member Since: 04 May 2015 Location: Suffolk Posts: 6709 ![]() ![]() ![]() |
I'm afraid I can't help with technical stuff, but my first Defender was 3.5V8 90 and it was awesome!
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PumaPhil Member Since: 26 Oct 2014 Location: Swansea Posts: 186 ![]() ![]() ![]() |
Thanks |
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defender9 Member Since: 12 Mar 2016 Location: Fylde Coast Posts: 1397 ![]() ![]() ![]() |
A 3.5 is a nice conversion. Mine is a factory built 3.5 with the LT85 and is a nice set up if slightly agricultural. 1985 factory V8 Ninety
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PumaPhil Member Since: 26 Oct 2014 Location: Swansea Posts: 186 ![]() ![]() ![]() |
Was the LT85 standard on early V8 90’s? Most threads i’ve read on the conversion are also converting to auto - usually lifting a complete engine and transmission from a Discovery or Range Rover. I’ve yet to find any info on keeping the LT77 ‘box. Although apparently an LT77 is the go-to gearbox when putting a Rover V8 into a kit-car. |
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LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 8902 ![]() ![]() ![]() |
The LT85 was introduced because the LT77 wasn't up to the job of a V8 in a Land Rover. Kit cars are a lot lighter and so less of an issue.
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Retroanaconda Member Since: 04 Jan 2012 Location: Scotland Posts: 1798 ![]() ![]() |
You’ll need an LT85, or a R380/LT77 in V8 spec with the correct V8 input shaft. And with Defender shifters, which means having it made up or adapted unless you get very lucky and find one (most V8 boxes come out of Discos). Then you’ll need a bellhousing to suit, the LT85 has its own type and fits V8s no problem but LT77 and R380 bellhousings to fit V8 are pretty rare. And they differ in length because the boxes & input shafts differ in length. I made that mistake.
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PumaPhil Member Since: 26 Oct 2014 Location: Swansea Posts: 186 ![]() ![]() ![]() |
Great, thanks Retroanaconda. Just the answer I was looking for. So if I understand that correctly, a Discovery V8 to LT77 bell housing and input shaft on my gearbox would allow the V8 to fit without bulkhead modification? Just the engine mounts and plumbing to sort then. Happy to do all the mechanical and welding work, but would like to keep it all related to one component. So all mods around the engine, leaving body and gearbox location standard (at least it seems to make sense in my head to do it that way).
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Retroanaconda Member Since: 04 Jan 2012 Location: Scotland Posts: 1798 ![]() ![]() |
If you use a Disco V8 LT77 (with shifters changed to Defender spec) then I think so yes. The bulkhead aperture is quite tight on the 4cyl (200Tdi and earlier) models and the V8 box would be about 2" further back than 'normal', however the V8 bellhousing is a lot longer than a 4cyl one and so the 'bell' bit of it is further forwards.
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PumaPhil Member Since: 26 Oct 2014 Location: Swansea Posts: 186 ![]() ![]() ![]() |
Thanks again for the info 'anaconda. As you say, the only real way to know is try and see. Any photos of your build, or a build thread on here? |
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rallysteve Member Since: 10 Feb 2014 Location: South Yorks Posts: 1536 ![]() ![]() ![]() |
Interested in what you mention about the bulkhead aperture. I have just fitted a 3.9 with R380 into my 90 and bulkhead aperture is identical to tdi's and my TD5. The 90 it has gone into is a very early one.
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Retroanaconda Member Since: 04 Jan 2012 Location: Scotland Posts: 1798 ![]() ![]() |
There’s a build thread on the LR4x4 forum, it’s a long way from finished though.
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charcoal Member Since: 28 Jul 2014 Location: Hampshire Posts: 893 ![]() ![]() ![]() |
The LT77s was fitted to factory v8 Defenders from 1991 to 1994 being replaced by the R380 if I remember correctly so it should be up to the task. If you get the bellhousing and input shaft for a v8 you can keep the current LT77 and just replace those giving you the factory position of the v8. 1999 Land Rover Defender 110 td5 station wagon 1998 Land Rover Defender 110 County Station Wagon ~ Sold 1995 Land Rover Defender 110 V8 Station Wagon ~ Sold ![]() 1985 Land Rover 110 ex mod project Tithonus ~ Sold ![]() |
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Retroanaconda Member Since: 04 Jan 2012 Location: Scotland Posts: 1798 ![]() ![]() |
It won’t give the factory position of the V8 because the transmission is mounted in a different position in the chassis on early 4cyl vehicles. The engine would be about 2” rearwards from factory.
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PumaPhil Member Since: 26 Oct 2014 Location: Swansea Posts: 186 ![]() ![]() ![]() |
Thanks both. Hopefully with the engine 2 inches further back it will still leave enough room to clear the bulkhead - I have read that some conversions mount the engine so far back that the rocker covers cannot be removed. |
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