Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

Go to Thread: PreviousNext
Go to: Forum ListMessage ListNew TopicLog In
Goto Page: 12Next
Current Page: 1 of 2


LaVerne
LaVerne Downey

(13 posts)

Registered:
09/03/2018 08:24AM

Main British Car:


swapping a 3.5 for a 4.0 rover in a TR8
Posted by: LaVerne
Date: October 08, 2018 09:46AM

Greetings.... I'm new to the site and looking for advice from anyone who's been down this road. I brought home a very rough TR8 coupe as a project. I also picked up a 4.0 out of a 98 Land Rover Discovery figuring that it would give me the HP and driveability I was after on a fairly stock build. I'm pretty keen on keeping the 4.0 front cover with the serpentine belt drive along with the components being driven. Also I want to keep the coil pack arrangement. I was given a manual gearbox Land Rover flywheel with the spark triggers but after seperating the gearbox from the 3.5 I have doubts it will fit inside the bell housing. I will need to address the oil pan on the 4.0 but my plan was to install the 4.0 and see what all will need to be done for fitment and the drop it back out and begin the body work.

So I'm looking for any help from anyone who might have "been there, done that" for advice, even if not in a TR8

Thanks,

LaVerne


LaVerne
LaVerne Downey

(13 posts)

Registered:
09/03/2018 08:24AM

Main British Car:


Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: LaVerne
Date: October 08, 2018 09:57AM

Where I'm at now
IMG_0663 (2) (1).JPG


donkelly23
Don Kelly
Charleston, SC
(111 posts)

Registered:
07/21/2011 05:13PM

Main British Car:
1980 TR7 V8 Z28 FI ECM 4.0

Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: donkelly23
Date: October 08, 2018 01:44PM

Is that going in
or coming out?


LaVerne
LaVerne Downey

(13 posts)

Registered:
09/03/2018 08:24AM

Main British Car:


Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: LaVerne
Date: October 08, 2018 03:33PM

Thats what came out.....this is what I need to fit..
IMG_8856a.JPG
IMG_8853 a(1).JPG


donkelly23
Don Kelly
Charleston, SC
(111 posts)

Registered:
07/21/2011 05:13PM

Main British Car:
1980 TR7 V8 Z28 FI ECM 4.0

Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: donkelly23
Date: October 09, 2018 08:48AM

Need to swap the oil pan off the TR8
I would pull the acc. off the old for the new as I think it will be to high



Edited 1 time(s). Last edit at 10/09/2018 08:49AM by donkelly23.


MGBV8
Carl Floyd
Kingsport, TN
(3496 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: MGBV8
Date: October 09, 2018 08:53AM

He is going from V-belt to serpentine.


RDMG
Dave R
Northern Virginia
(107 posts)

Registered:
04/07/2016 08:29PM

Main British Car:
1979 MGB 4.6L Rover V8

Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: RDMG
Date: October 09, 2018 10:43PM

The oil pan swap may be worth sorting out first.

The 4.0/4.6 oil pickup attaches to the front cover, not the middle of the block, and I donít think the later front covers can be modified to accept the older style pickup location. My 4.6 Bosch-era cover has a 1Ē deep vestigial stub-hole(?) casting that aligns to the older pickup passages in the block, but the stub doesnít connect to anything. Thereís a spring bypass valve on the other side of it that connects to the gerotor pump, but I have no idea what would happen if you drilled out the stub to connect them. Probably something not good.

The older style pan may fit over the new pickup, but I donít think so. Itís possible that you could cut/weld/hammer a sheetmetal oil pan to fit around the later style pickup.

If none of the above sounds appealing but youíre committed to the serp front cover, you may be committed to the serp pan.



LaVerne
LaVerne Downey

(13 posts)

Registered:
09/03/2018 08:24AM

Main British Car:


Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: LaVerne
Date: October 10, 2018 10:35AM

Thanks guys. I need to get my engine stand back from my nephew later today and pull the pans and see what I'm up against. This may not be do able, but we'll see. I know the plenum will take some work to clear the bonnet and I suspect the alternator will sit to high as well....it will be close. I think the rest of it will fit . I did get a little cleaning done yesterday.
IMG_0682b.JPG
IMG_0706b (1).JPG
IMG_0689b.JPG
IMG_0702 b(1).JPG


Dan B
Dan Blackwood
South Charleston, WV
(947 posts)

Registered:
11/06/2007 01:55PM

Main British Car:
1966 TR4A, 1980 TR7 Multiport EFI MegaSquirt on the TR4A. Lexus V8 pl

authors avatar
Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: Dan B
Date: October 10, 2018 10:52AM

Which bonnet does that car have? The later one with the extra bump in the middle should help if you have that. I can't really tell from the exposure but it looks like you might. The plenum on my 1uz fits perfectly in the center bump.

I should add that we spaced the body up about an inch from the original TR7 position. We used hockey pucks.



Edited 1 time(s). Last edit at 10/10/2018 10:53AM by Dan B.


LaVerne
LaVerne Downey

(13 posts)

Registered:
09/03/2018 08:24AM

Main British Car:


Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: LaVerne
Date: October 11, 2018 12:47PM

It's the later bonnet with the bump out but I imagine the plenum will still be an issue. The question before me now is if the oil pick up tube and il pan can be interchanged between the two blocks without issue. Clearly the Land rover pan will not work and I suspect if I remove both pans I will find different pick up assemblies. Not a big deal if they can be swapped. Big mess and a waste of time if they cannot. Anybody know for sure?


donkelly23
Don Kelly
Charleston, SC
(111 posts)

Registered:
07/21/2011 05:13PM

Main British Car:
1980 TR7 V8 Z28 FI ECM 4.0

Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: donkelly23
Date: October 11, 2018 01:37PM

Same block


LaVerne
LaVerne Downey

(13 posts)

Registered:
09/03/2018 08:24AM

Main British Car:


Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: LaVerne
Date: October 11, 2018 02:58PM

Thanks Don. I went ahead and pulled the pans and see that it shouldn't be a problem to swap the pickups and the pan. The TR8 pan has the windage tray bolted to the bottom of the black. The 4.0 pan has the tray welded into the pan. Good news is that the 4.0 is drilled and tapped to move the tray from the 3.5. I will need to check the throw of the crank for any difference I suppose.
IMG_0718a (1).JPG
IMG_0720a.JPG
IMG_0722 a(1).JPG
IMG_0723a.JPG


LaVerne
LaVerne Downey

(13 posts)

Registered:
09/03/2018 08:24AM

Main British Car:


Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: LaVerne
Date: October 11, 2018 03:04PM

For now I just removed the pick up off the 4.0 and put the 3.5 pan on it. Moved it over and will bolt up the gearbox and shove it all back in and see how it fits. Removed the air conditioning compressor as I'm pretty sure it would not clear going in but I believe it will once in the engine bay.
IMG_0715a.JPG
IMG_0725a.JPG


MGBV8
Carl Floyd
Kingsport, TN
(3496 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: MGBV8
Date: October 11, 2018 06:15PM

Quote:
Same block

Same external dimensions, but not the same block. You cannot interchange these two blocks.


LaVerne
LaVerne Downey

(13 posts)

Registered:
09/03/2018 08:24AM

Main British Car:


Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: LaVerne
Date: October 11, 2018 09:12PM

The 4.0 is in now and the alternator is an issue as well as the plenum. At this point I believe I will cut openings in the TR7 bonnet I have and try and fab up some semi attractive bubbles to weld in place.
IMG_0732a.JPG
IMG_0731a.JPG
IMG_0740a.JPG



donkelly23
Don Kelly
Charleston, SC
(111 posts)

Registered:
07/21/2011 05:13PM

Main British Car:
1980 TR7 V8 Z28 FI ECM 4.0

Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: donkelly23
Date: October 12, 2018 09:02AM

Why do that
Better ideas than butchering a bonnet


Dan B
Dan Blackwood
South Charleston, WV
(947 posts)

Registered:
11/06/2007 01:55PM

Main British Car:
1966 TR4A, 1980 TR7 Multiport EFI MegaSquirt on the TR4A. Lexus V8 pl

authors avatar
Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: Dan B
Date: October 12, 2018 09:48AM

It is hitting the alternator. Move it to the side and the bonnet will close. The plenum looks to me like it will fit right in the bump.


LaVerne
LaVerne Downey

(13 posts)

Registered:
09/03/2018 08:24AM

Main British Car:


Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: LaVerne
Date: October 12, 2018 10:00AM

I am open to suggestions but the car was never going to go back to original. Using the 4.0 gives me something a lot closer to the hp I'd like to see without getting crazy on the build. The single belt drive at the front also appeals to me for a number of reasons as well as the fi and the coil pack if I can pull it off. A relocation of the alternator is something I'll look at first but preliminary indications are it's unlikely I will do so. I drug this 7 home for parts so I don't have any problem hacking up the bonnet in an attempt to build what I'm after.
IMG_9894a.JPG


RDMG
Dave R
Northern Virginia
(107 posts)

Registered:
04/07/2016 08:29PM

Main British Car:
1979 MGB 4.6L Rover V8

Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: RDMG
Date: October 13, 2018 07:44AM

Double check that the front cover will still work with the new oil pickup location.

The block still has the passages and threaded holes for the older style mid-point pickup, but my 4.6 front cover does NOT align with the old passages in the block. (The gasket has a hole for the old pickup line, but the cover casting blanks it off.). I think the flow through the 4.0/4.6 cover by the old pickup hole is reversed from the older style, so drilling a hole isnít an option, and I donít see an easy way to modify it to accept the old pickup.

Iíd hate to see you go to lot of work to adapt sheetmetal to the serpentine alternator/ac/belt/pulley setup, only to have it not work out.


LaVerne
LaVerne Downey

(13 posts)

Registered:
09/03/2018 08:24AM

Main British Car:


Re: swapping a 3.5 for a 4.0 rover in a TR8
Posted by: LaVerne
Date: October 13, 2018 08:33AM

I didn't swap front covers Dave. Complete swap from the 3.5 to the 4.0 Both blocks have the oil pick up tubes located mid block. The tube bends are different as are the pans but they are interchangeable. I removed the alternator and as expected the plenum sits to high. I made a half hearted attempt to remove the plenum but the allen head bolts are firmly fixed and I'll need to pick up the correct size socket drive. I suspect they may be loctited and some heat may be in order as well. I had to go help get an MG tub moved from the paint shop yesterday and I saw something on this caddy that has me thinking that there is an alternative to butchery. I have plenty of room below the power steering pump if I can fab up some bracketry and come up with a double belt drive pulley.
IMG_0775a.JPG
IMG_0772a.JPG
IMG_0718a.JPG
IMG_0721a.JPG
Goto Page: 12Next
Current Page: 1 of 2


Sorry, only registered users may post in this forum.