3.5L V8 Replacement Options - Defender Source
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  #1  
Old December 26th, 2013, 09:28 AM
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3.5L V8 Replacement Options

What are the best and easiest replacement options for a mid-80's 3.5L V8? I am considering both carb and EFI options. Interested to see which requires fewest replacements of ancillaries.
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  #2  
Old December 26th, 2013, 09:45 AM
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To my mind, easiest would be a 4.2 with a carb. Up a notch in both performance and complexity would be a 4.6 modified to run a dizzy.
Define "best". Spending least amount of money? Time? Labor?
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Old December 26th, 2013, 03:10 PM
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Quote:
Originally Posted by Stormer View Post
What are the best and easiest replacement options for a mid-80's 3.5L V8? I am considering both carb and EFI options. Interested to see which requires fewest replacements of ancillaries.
Why do you want to replace the engine? From the research I have done, replacing the camshaft & going to a single carb setup will likely give you a lot more power. Plus the 3.5 was one of the best engines ever put in a Rover.

Hope it works out either way!
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Old December 26th, 2013, 03:24 PM
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I went with a 3.9 v-belt out of a RRC with a upgraded cam, intake and holley carb. It was pretty straightforward. The only real issue was getting the power steering hoses to work out. I used all RRC ancillaries on it. Bigger alternator and easier to find parts with all the RRC's getting scraped.
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Old December 26th, 2013, 09:05 PM
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Best in my mind is a combination of performance and reliability. I am looking for an application for a 130 so my primary concern with the 3.5L as it stands is simply performance. I am open to modifying the 3.5 to improve performance or a swap.
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Old December 26th, 2013, 09:11 PM
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3.9's in my mind are extremely reliable for a Rover motor.
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Old December 26th, 2013, 10:55 PM
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3.9's in my mind are extremely reliable for a Rover motor.
IMO all the problems are from the thinner cylinder wall, so if you are going 3.9 you might as well go 4.6 as long as you can get a decent block. That said, I've had a 4.6 on the engine stand for about a year just because I'm not ready deal with the heartache of finding out its got a bad block.
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Old December 26th, 2013, 11:02 PM
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I honestly never see the issues with the 3.9's. It's always the 4.0/4.6 that seem to have issues. All my 3.9's have always been reliable knock on wood
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Old December 26th, 2013, 11:06 PM
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I honestly never see the issues with the 3.9's. It's always the 4.0/4.6 that seem to have issues. All my 3.9's have always been reliable knock on wood
The 3.9 used to blow head gaskets all the time. They issued an update to use the newer gaskets and leave out some head bolts.
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Old December 26th, 2013, 11:07 PM
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I honestly never see the issues with the 3.9's. It's always the 4.0/4.6 that seem to have issues. All my 3.9's have always been reliable knock on wood

I've had 2 3.9s die. The first one was replaced by the dealer. 100k later it had a tensioner fail while towing and overheated, got about a year out of it before cyl 5 leaked. It looked ok so I wasted $ on headgaskets only to verify the block was trashed.

Had a GEMS 4.0 go on cyl 7, visibly cracked through the liner.

cool story, I know
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Old December 26th, 2013, 11:17 PM
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Tensioner failure could happen on any of them, so cool story bro lol

I still prefer the 3.9 to the 4.0/4.6

Also I have the composite gaskets with the left out head bolts.
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Old December 26th, 2013, 11:43 PM
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Tensioner failure could happen on any of them, so cool story bro lol .
yup, which is why I now carry a spare and glance at the tachometer every 30 seconds while driving

I still think a 3.5 would have had a better chance at living through that failure, so if that peace of mind is gone go for the displacement.
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