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| 8 & 10 cyl Bristol cars Type 407 onwards - restoration, repair, maintenance etc |
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20-09-24, 08:02 PM
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Here's a link to the fitting of an Ultra-bell adapter to a 518
https://board.moparts.org/ubbthreads...ics/35994.html 
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22-09-24, 06:06 PM
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To my way of thinking the idea of piston melt is theoretical. I have never heard of a case on road engines. What would concern me more is that, over a period of time, oil may not return fully to the sump and build up in the upper part of the engine eventually starving the sump and causing bearing failure. A warning of this would come by falling oil pressure. On long fast runs on my 440 engine the oil pressure falls but then stabilises. I rely on the oil pressure gauge.
3000 rpm on the Torqflite gearbox is 3 x 26.5mph per thousand rpm so, say, 80 mph. I would have thought that’s easily achievable as would 4000 rpm (110 mph) the difficulty is finding roads open enough to do that continuously even in Germany.
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25-09-24, 12:57 PM
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Great to see someone's interested in very high speed touring in their Bristol - well done.
The factory claimed a top speed of 140 mph so perhaps if you leave some margin that'd be kinder to the car. I can't see why there should be a problem using any of the rev ranges you suggest - either for half an hour or longer. Usual caveats apply about engine in good condition etc.
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25-09-24, 02:59 PM
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I think the top speed is higher than 140 mph in my car. While checking the Air/Fuel ratio at wide open throttle my engine guy and me reached 136 mph “by mistake”. I can tell you there was quite a bit of “slack” in the accelerator pedal.
If you ask me how it felt… I am not so keen to do it again! The car behaved quite well, but I was too scared to press on. The engine guy was shocked, as he normally does engines for american classic cars. Normally they never go faster that 90 mph on those. He claims that this was the fasted drive he ever had in a car with an US V8…and couldn’t stop giggling for some time.
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25-09-24, 04:35 PM
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What a flying machine, that's brilliant!
I guess you could ask your chap if he thinks it'd cope with a gentle cruise at 120 mph for a few hours - I suspect he'd say of course! I've got an old magazine article from the 70's where a chap was on an autobahn in a series 5 411, hunting down 450 SEL 6.9's and the like with great success - will try and dig it out. Let us know how you get on - perhaps a few early morning runs to see how she behaves when well into three figures? Cheers Andrew
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