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| 8 & 10 cyl Bristol cars Type 407 onwards - restoration, repair, maintenance etc |
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12-03-12, 09:40 PM
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12-03-12, 10:55 PM
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13-03-12, 03:53 AM
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13-03-12, 11:46 AM
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 In terms of cost vs performance vs economy, I think there's a strong argument for just putting an LS into one.
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13-03-12, 02:25 PM
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I have been running a Merc 320 CDI Estate for quite a few years as my work horse - Turned out to be the best all round car I have ever owned and nowhere near the most expensive - never broke down or missed a beat. ( touch wood )
I would love the 320 CDI engine and box in a 411 if someone could suss out how to keep the electronics happy ! I guess you would have to move the whole loom over and then get a boffin to turn a pile of stuff off on the dreaded ECU. Anything can be done with time and money :-) Some of the Taxi customers at my Merc dealer are over a million miles on the original engine and it's plenty powerful for me. I have even heard a few have thrown some cheap rape seed oil in over Summer But then the purist in me is fighting to keep everything standard. I guess it would need a 411 to come up with a dead engine at a very cheap price to make it all happen -- little chance :-(
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13-03-12, 03:33 PM
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Well, this is where I have to be careful because it is my own compmnay which can do this thing. So the following is by way of engineering explanation, not promotion.
Firstly, talking generally about using diesels inplace of petrols. At present we have a range of conversions for Land Rover Defenders, including 4.2 Supercharged Petrol V8 (460 bhp, 570 Nm), 4.4 Normal Petrol V8 (320 bhp, 422 Nm), and 2.7 Twin-Trubo Diesel (240 bhp, 530 Nm). It is torque which breaks transmissions (together with very bumpy roads/paths), so for the 4.2 SC and the 2.7 TD, we uprate the propshafts, diffs and halfshafts. We have often been asked to fit the 4.4 litre Land Rover TDV8 engine but there is no way it can be worth it becasue the transmission and chassis just can't deal with 800 Nm. Similarly, the 460bhp of the 4.2 SC is rather challenging, but at least it doesn't break anything, by itself. The point I'd like to make is that when retro fitting an engine to an older car, it is the torque figures one must look out for, so in turbo-diesel terms one tends to end up with a smaller capacity engine, for obvious reasons. As I understand it the 411 engines made about 450 Nm (335 lbf.ft), and we can easily exceed 500 Nm from the 2.7 V6 diesel, so it is more than enough. The 240 bhp is also plenty to get a Bristol to cruise at well over 100 mph, if not as fast as with the 6.3 litre Chrysler engine. The main difficulty is persuading a hydraulically controlled gearbox to changeup before the diesel rev-limiter comes in. As has been implied, these modern diesel engines tend to be tied in with loads of electronics and the electronics of the auto gearbox. We buy in an aftermarket, stand-alone ECU to run then engine and we similarly have our own controller for a 4-speed ZF gearbox. Trying to modify the original ECUs for these engines and gearboxes is virtually impossible unless you have full cooperation from the manufacturer, and Bosch, and ZF, which aint gonna happen. For the Bristol, the most practical solution would probably be the V6 diesel with the 4-speed ZF (it has a lock-up TC), and keep or sell the old engine and box together. Also, because of all the electronic and wiring loom costs, these conversions are no longer cheap and cheerful. We use new engines, but even with second-hand units I doubt you would get much change from £10,000.
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13-03-12, 10:27 PM
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I saw a reasonably new defender 90 in Trafalgar Sq yesterday with a pretty rorty V8 and ventilated disks. If it hadn't been for the wider wheels and alloys you wouldn't have know it wasn't standard. Awesomely quick pickup, great in traffic. I wanted one! (I was trying to work out if the mud was hand painted on though)
As the V8 engines are reasonably cheap to replace there isn't such a good case for switching engines. Unlike the 401/403 cars...... there are quite a few which have lost their engines and would make great sleepers
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14-03-12, 12:50 AM
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Speak soon Thor :-)
It would be good to make the whole thing as reversible as possible. But balls out ! lets do it and make a superb every day driver.. S2 411 ready ! I do like it on some of the American TV car shows that show a car is appreciated and valued when these sort of mod's are done well. It does seem to devalue a classic car a lot in the U.K. when it is modified from standard, although Eagle and Beacham Jaguar modified cars seem to be changing values and opinions for this way of thinking. Is it so far away from the thinking of an S6 that so many of us admire ? Or maybe even better !! shock , horror ......
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18-03-12, 11:52 AM
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Kevin
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18-03-12, 01:54 PM
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I have just parted with my 110 4cab and one of these looks like fun. Also worth looking for on youtube , they corner like they stink P
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