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Thread: What motor would you fit to replace 3.5V8

  1. 3rd December 2023, 07:13 AM #1
    gasman
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    What motor would you fit to replace 3.5V8

    I've had my nearly mint 2 door for 18mths now and whilst the 3.5 is running very well, I would love to have more power for the amount of $ spent on fuel.
    I know I'll need to drive it for 10 years to get back the outlay, but........
    So who's done what and how much?
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  2. 3rd December 2023, 08:47 AM #2
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    loanrangie
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    Another RV8 of larger capacity would be the most economical upgrade, 3.9/4.0 or 4.6.
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  3. 3rd December 2023, 09:50 AM #3
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    V8Ian
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    I'd be looking at a 3.9 for ease of conversion and reliability in comparison to the larger motors.
    If you don't like trucks, stop buying stuff.
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  4. 3rd December 2023, 11:05 AM #4
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    Tins
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    LS.
    ​JayTee

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  5. 3rd December 2023, 11:17 AM #5
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    Quote Originally Posted by Tins View Post
    LS.
    Too much work and expense, also the issues of far from stock if someone else has to effect diagnosis and/or repair.
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  6. 3rd December 2023, 12:42 PM #6
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    Tins
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    Quote Originally Posted by V8Ian View Post
    Too much work and expense, also the issues of far from stock if someone else has to effect diagnosis and/or repair.
    Lots of kits out there. Standalone ECUs. Older engines have cable operation for throttles. Far more available than ANY RV8. As for diagnosis, any holden head will be able to do that.

    Is a 3.9 any better power wise than a 3.5? OP wants more power, Ian. Pretty sure all RV8s other than the 3.5 are EFI, so there will be a LOT of stuff to do to get it running. Which will then also be far from stock.

    OP did say he would amortise over 10 years. One liner slip on a RV8 will cost as much as the LS.

    Reliability would be no contest.
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  7. 3rd December 2023, 01:07 PM #7
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    3.9 wasn't prone to liner slip and everything bolts upwith it all being stock LR.
    A cam gets more performance, cheaply.
    No changing gearboxess,, transfers, crossmembers/mounts or driveshafts.
    It really depends on how far the OP wants to go.
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  8. 3rd December 2023, 09:42 PM #8
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    3.9 with all its EFI gear or theres not a lot of point in it.
    Dave

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  9. 4th December 2023, 11:13 AM #9
    PhilipA
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    Unusual suggestion
    Why not a Holden 3.8 V6.
    The V6 is actually 3/4 of a Buick 300 which is the iron successor to the Buick 255 which is the father of the 3.5 Rover V8 . Hell the lifters are even the same.
    You would be able to get a supercharged version if you like and there are myriads of tuners who know the Holden ECU who could adapt it to a D1 which has almost no electronics.
    It will fit in the engine bay easily and not weigh too much more than a 3.5 and less than say a TD5 or even 200TDi so springs etc are not an issue.
    I even think the bell housing pattern would be the same but I may be wrong.
    Just my 2c worth.
    Regards PhilipA
    BTW 3.9s do get slipped liners and warped blocks and cracked blocks .
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  10. 12th December 2023, 11:02 AM #10
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    aussearcher
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    Gasman,
    This is a very dangerous loose thread to start pulling on! I have debated this question with myself for several years. I currently have a 1998 D1 that started at 3.9 and is now stroked out to 4.5, running a chipped 14CUX, warm cam, top hat liners and a 13.0 compression ratio. It is lifted and is on 33s. Around town it uses 25 litres/100km. In the bush it uses 25 litres/100km. On the highway it uses 25l/100km. Given the CR, it only drinks premium. It sounds nice and has reasonable poke, but nothing to get too excited by. If you drop a 3.9 into your car you will notice a difference over the 3.5, but the effort is probably not worth it. The 3.9's fuel injection system is now 30 years old, primitive, and you will find yourself constantly chasing niggly issues with the sensors and relying on second hand or questionable aftermarket parts.

    I have contemplated a range of engine swap options from Holden V6s to BMW diesels. Certainly the LS and 6 speed auto conversion is tried and tested. I have a fair investment tied up in my 4.5 motor, and will probably put a decent aftermarket ECU on it as a first step. Online Gearbox Parts in the UK are contemplating production of an RV8 to ZF 8HP auto box adaptor. Adaptors for the ZF 8HP to the D1 transfer case already exist. To my mind a modern gearbox offers a lot of upside.

    Probably none of the above assists with your question, but at least you know it exercises other minds as well!
    Regards,
    Alan
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