110 Engine Swap to 3.9L? - Defender Source
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  #1  
Old October 6th, 2014, 08:11 PM
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110 Engine Swap to 3.9L?

Hello Everyone and thank you for your help in the past. I am looking to swap engines out of my 1986 110 with a standard 3.5L to almost anything else that will pass emissions. Diesel is unfortunately not doable for me. It needs to be a US spec engine. So, I am contemplating all kinds of options including designing my own conversion. My main question to anyone out there that knows for sure is; Will a 3.9L V8 out of a Range Rover County automatic or manual easily fit into the 110? It would be nice for me to purchase a County and take the engine, tranny and transfer case and install it into my 110. I am thinking that the motor mounts are the same and that the engine should fit nicely into the doghouse. I know that I'll have to modify the tranny tunnell, but to what extent? Will I have the clearance and only simply have to cut a hole for the shifter? I have a RR that's for sale in mind but a very limited time to buy it so any help would be much appreciated.


Thank you and good day to all!
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  #2  
Old October 6th, 2014, 08:37 PM
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The 3.9 will work just fine. I have a 3.9 out of a RRC in my 83 110. Motor mounts and cooling hoses are all a straight swap. If you keep the RRC accessories than you will need to redo a bit of wiring and the power steering hoses.

Someone smarter will need to answer on the auto box. On mine with a LT95 I believe the tranny tunnel is fine. Your's may be different though.
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Old October 6th, 2014, 08:55 PM
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I have installed the engine trans and transfer case from RRC's into 110's. What transmission is in your truck now ?

If your goal is to pass emissions do you also have to pass an evaporative test ? The 14cu hotwire system can be made work in your truck you will need to add either an in tank or inline pump,the cross member will need to be swapped to the rounded classic on which requires some modification, then you can use the classic y pipe with o2 sensors. Its far from simple but if you are mechanically apt you can make it work.
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Old October 6th, 2014, 09:20 PM
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The best thing you can do is to buy a complete running vehicle to pull the drivetrain from so that you will not be missing all of the little pieces that you don't know you need until you need them.
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Old October 6th, 2014, 10:55 PM
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I am starting a similar engine swap on my '86 V8 3.5L, but keeping the manual transmission which I believe to be an LT85. I have started rebuilding the heads and working on sourcing some of the ancillaries needed. My setup is out of a '94 NAS D90, and includes the 14CUX ECU, MAF, Diagnostics Module and distributor.

I thank you all if you can answer the following questions, which I believe will also be of benefit to medcloud:

1) Will I also have to swap out the crossmember to the rounded classic as Douglas is recommending? Does this apply to an '86?
2) It looks like I will need a VSS (speed transducer) P/N RNC860 (Rovers North). Is this a straight bolt on item to my LT85 transmission?
3) Unless I'm wrong, the 14CUX does not control the distributor, yet the distributor that came with the engine has a 3-pin connector without a mating plug at the wiring harness. Is this the Amplifier Module, and if so, what does connect to?
4) Finally, the exhaust manifolds on the 3.9L are 4-into-2, and they are 4-into-1 on the 3.5L. My plan is to have new catalytic converters and O2 sensors installed, so will I need custom fabrication to mate the 3.9L to the existing exhaust of the 3.5L, or is there another solution out there?
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  #6  
Old October 8th, 2014, 09:17 AM
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Quote:
Originally Posted by ArmyRover View Post
The 3.9 will work just fine. I have a 3.9 out of a RRC in my 83 110. Motor mounts and cooling hoses are all a straight swap. If you keep the RRC accessories than you will need to redo a bit of wiring and the power steering hoses.

Someone smarter will need to answer on the auto box. On mine with a LT95 I believe the tranny tunnel is fine. Your's may be different though.


I believe that I've got the LT95 as well. So, if yours is a manual 4 speed, I'm wondering if you kept all of the fuel injection or did you strip the motor down and run a carb? What did you keep, what did you have to modify?


I appreciate the response. It's nice to know that the motor mounts and cooling hoses are the same.


Thanks!
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Old October 8th, 2014, 10:33 AM
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The floors have nothing to do with fuel injection or carburation, only the trans and transfercase. The lt 95 floors and tunnel will not clear the auto setup which is why I asked what trans you have now. On Trey's truck we swapped over to lt77 floors and tunnel but that requires some fab work on the face of the lt95 seat box. The r380 setup will clear fine as well.
I should clarify that- the lt95 works with the auto, It doesn't work with the top of the lt230. I have a truck in the shop now with the lt95 floors and auto but the owner wanted the borg warner tcase out of the donor rangie retained and that clears fine.
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  #8  
Old October 8th, 2014, 11:32 AM
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Let me add if you get a Serpentine V8, you will also need to swap out your Radiator shroud because the water pump and fan are offset to the left.
You can use one off a serp belt RRC or D1.
If you go EFI, make sure you get the CPU and harness.
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  #9  
Old October 8th, 2014, 11:44 AM
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I'll add my .02: go bigger. A 4.6 will fit the same way a 3.5/3.9/4.0 will fit.
I also recall fitting a 3.9 intake and EFI to a 3.5. Worked pretty well, but haven't seen the car for a few years, so I'm not sure how well it continued to work....
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  #10  
Old October 8th, 2014, 11:47 AM
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Quote:
Originally Posted by Roverlab View Post
I'll add my .02: go bigger. A 4.6 will fit the same way a 3.5/3.9/4.0 will fit.
I also recall fitting a 3.9 intake and EFI to a 3.5. Worked pretty well, but haven't seen the car for a few years, so I'm not sure how well it continued to work....
Weren't the early NAS RRC EFI 3.5's?
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  #11  
Old October 8th, 2014, 11:50 AM
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Quote:
Originally Posted by jafir View Post
Weren't the early NAS RRC EFI 3.5's?
We have an 89 RRC 3.5 with EFI sitting at the shop, so I would say yes.
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  #12  
Old October 8th, 2014, 11:52 AM
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As far as I know we only got the efi in the USA..beginning 1987...
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Old October 8th, 2014, 12:12 PM
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Quote:
Originally Posted by medcloud View Post
I believe that I've got the LT95 as well. So, if yours is a manual 4 speed, I'm wondering if you kept all of the fuel injection or did you strip the motor down and run a carb? What did you keep, what did you have to modify?


I appreciate the response. It's nice to know that the motor mounts and cooling hoses are the same.


Thanks!

I stand corrected on the setup working with the floors already in it.

I swapped out the intakes and went with the carb set up and long tube headers on mine. I have a holley 390 4 barrel and edelbrock intake works fine.
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Old October 8th, 2014, 12:28 PM
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Quote:
Originally Posted by Brewie212 View Post
We have an 89 RRC 3.5 with EFI sitting at the shop, so I would say yes.
1989 should be a 3.9
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Old October 8th, 2014, 12:54 PM
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Quote:
Originally Posted by Jymmiejamz View Post
1989 should be a 3.9
thanks Jimmy, I thought they ran through 89? I was told by the owner that it was an 89, but it is clearly a 3.5 EFI.
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  #16  
Old October 8th, 2014, 12:56 PM
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Quote:
Originally Posted by Jymmiejamz View Post
1989 should be a 3.9
yep mine was. 87 and 88 were 3.5's albeit higher compression 3.5's than the row carbed trucks. What the original poster has is a complete NAS 90 setup and he already owns it.
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  #17  
Old October 8th, 2014, 09:58 PM
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Hi Doug,


Sorry it took so long to get back to your reply. I'm confused but most likely because I'm new to all the part numbers. Kind of like being in the military for the first time with all of those acronyms To make things less confusing I should ask you what combinations with a 3.9L engine, trans, and transfer case works the best in a 1986 110 RHD? Is there a good combination that doesn't involve chopping the chassis, floors or trans tunnel? I don't mind getting rid of the components that are on the truck if it keeps the body and chassis intact and as close to original as possible. Kind of like surgery, I want the least invasive option.


Thanks,


Andy
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Old October 8th, 2014, 10:37 PM
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110 Engine Swap to 3.9L?

Andy: I can answer some of those questions since I'm going through the exact exercise on my '86. I'm sure people in the know will correct me if I'm wrong. My truck is identical to yours:

The "easiest" swap requiring no chopping, cutting etc. is the 3.9L with a manual transmission, which will drop right in and mate to the manual transmission in your truck, namely the LT77 or LT85 (depending on what's in your truck) and the stock transfer case which is the LT230.

As was said above, your best bet is to buy a complete engine (less tranny and transfer case), making sure you also acquire the wiring harness, ECU (Lucas 14CUX) and MAF (mass airflow sensor), air box, alternator, P/S pump, A/C compressor (even if you don't plan on having air conditioning now), distributor & coil, and finally the exhaust manifolds. In short everything you can lay your hands on out of the donor vehicle. If you can get the VSS (also know as speed transducer) that would be great, and finally the down pipes (as Douglas mentioned up above), because the down pipes in our trucks are different.

I hope I didn't add to the confusion with some of the acronyms! Please feel free to PM me and we can also talk by phone if you wish.

To give credit where credit is due, most of this information I obtained on this forum from Douglas, Shayne and many others here. Thanks guys!
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  #19  
Old October 9th, 2014, 12:10 AM
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Here is a quick notes I made on the wiring for the 14cux system..
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  #20  
Old October 9th, 2014, 07:44 PM
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Hi Bill,


I've found that one could also go with an Edlebrock carb 500CFM for about $225 on Ebay and at my altitude of 8,000ft with a service variation of +/- 1,500ft, #83 main jets. I wish I could go this route, but I'm fairly confident that it won't pass emission requirements here in Colorado. Heck, my 3.5L runs great but I know it won't pass emissions with the original dual carbs and furthermore lack of a cat.


Noticed you're from Chicago. One of my favorite cities anywhere.


Thanks
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