 | Home > Technical > Which v8 3.5 3.9 or 4.2 |
 
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| Pam W Member Since: 25 Oct 2011 Location: North Yorkshire Posts: 1169   
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Out of the 3 the 3.9 is good for performance and reliability. More powerful and tunable than the 3.5. Plenty of 3.9s around to get bits off if you need them, 4.2 is rarer as iiRC was only fitted to the late Classic LSEs and not sure of reliability. I've driven a 3.5 and 3.9 and the 3.9 is much smoother.
As it happens I have a 3.9 efi on megasquirt, zf auto and Tartarini LPG kit sat on the drive, £1200 quid for the package if you are interested. All in good order, only came out of my daily drive Defender as I'm moving to the dark side. (sorry if that plug broke any forum etiquette!!) |
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16th Dec 2011 8:51pm |
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| T1G UP Member Since: 08 Dec 2009 Location: Bath Posts: 3101 
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4.6 thor engine out of a late RR
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16th Dec 2011 9:22pm |
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| walfy Member Since: 29 Aug 2007 Location: Frome Posts: 2655 
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Having had both the 3.5 and 3.9 in the same vehicle over a period of time, I liked the 3.5 more. After I had put a 3.9 cam in and a new set of lifters. It just felt better. I upgraded to the 3.9 thinking it would be better but there was no discernible difference.
Only V8 that I wouldn't touch would be from a P38. Never heard a good thing about them and when they go it gets expensive. HTH 110 D250 SE HT 110 USW SOLD RRE HSE Dynamic Gone, wife killed it VOLVO XC60 R Dynamic with some toys Polaris RZR 900XP SOLD |
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17th Dec 2011 8:01am |
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| TJ101 Member Since: 30 May 2007 Location: Taunton Somerset Posts: 3748  
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I have a 3.5 EFi auto in the hybrid, getting tired now, but has been bomb proof,, bog standard, has been well used
 but still goes well
The trayback had a 3.9 auto, with a 4.0 lt crank, rods cross bolted and top hat.s etc etc on mega squirt,, when it was going, went very well, but now fubared as it ran the crank !! so sat on the bench waiting for a rebuilt,, In its place is a bog Disco 3.9, on the mega squirt,,which works for what i need To answer the question Steve,, i would go later 3.9, serp belt engine,, forget P38 lumps, certainly the 4.6, due to the liners etc, California F1, 75th 110 "Kermit", 50th Ann V8, 90 V8 Hybrid, 55 Series 1 Main Brian James Trailer Dealer for South West UK |
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17th Dec 2011 8:42am |
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| T1G UP Member Since: 08 Dec 2009 Location: Bath Posts: 3101
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i got a 3.9 auto with the later serp belt etc. lovely motor, cheap to.
theres a breaker RR specialist along the road from me who has a vast selection of v8's but there all P38's |
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17th Dec 2011 9:49am |
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| wslr Member Since: 18 Jul 2010 Location: Wellington, Somerset Posts: 581 
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A 4.0 unit from the later range is good, but make sure it has top hat liners. They are already cross bolted as well. Both the 4.6 and 4.0 units suffer from cracked blocks but as long as they have had the top-hat liners inserted, they are pretty good. The 4.0 is a more refined unit at the top end than the 4.6.
Otherwise keep it cheap and simple with the 3.5. |
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17th Dec 2011 10:00am |
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| noworries4x4 Member Since: 24 Dec 2010 Location: Newton Abbot Devon Posts: 1195
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When i was testing on the rolling road years ago with my Bowler we got much better figures with Omex than we did with mega squirt it was was easier to map as well. If everything is under control you are not going fast enough.
Every Day 16 MY Discovery 4 Commercial Workshop and Escort Vehicle Weekends 07MY L322 TDV8 Vogue SE Series 1 80" 3ltr 6cyl with overdrive No Worries 4X4 |
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18th Dec 2011 9:54am |
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