I agree with what you are saying Ian, fifth gear on the Type 9 box is akin to an overdrive unit being 0.8 to 1, (or is it 1 to 0.8) .. and if my TC was permanently struggling to cope with a 8/37 ratio back end as well, I would do something about it. As it is, it cruises quite happily at 65 with some in reserve. The engine has not had the 'magic spanner' on it to any great extent either.WhenGeorge Edney rebuilt it after the crank broke a few years ago, he took it out to1350cc, and put slightly bigger valves in the head. He may also have fitted a 're-profiled' cam, but I'm not sure! He was advertising 1350 exchange engines at the time fitted with a new cam, but seeing as I didn't have a crank, I had to go 'the long way round' and have my engine rebuilt. I have no idea what the BHP figure is, a bit more than the standard 54 I suspect .. 60 plus maybe, the number is irrelevant as it copes with all I ask of it.
We all get to know our own cars, and if I feel the old thing needs it, I drop a cog to fourth. We do quite a few runs with B's, modern TF's etc and manage to keep up ... unless of course someone sticks their welly in to prove a point. I'm not advocating everybody should go the same route, just answering a query that was on the forum.
Tweed.
From: "ian thomson
i.thomson@talk21.com [mg-tabc]" mg-tabc-noreply@yahoogroups.com>
[b]To:[/b] MG-TABC List mg-tabc@yahoogroups.com>
[b]Sent:[/b] Friday, 1 February 2019, 14:47
[b]Subject:[/b] [mg-tabc] TC gear ratios
Inevitably this subject has turned to the use of five speed gearboxes, normally code for fitting a ford sierra box. The first thing that strikes me about this is: why do you need a five speed box and an higher final drive as surely they both do the same thing? As far as I know the fifth gear on the ford box is an overdrive gear, which means it is already a higher ratio than the straight through, one to one, top gear of the average four speed box like the TC one. Using both will surely give a higher top gear than originally intended and, perhaps, one too high for the engine to comfortably handle.
Ian Thomson
Notts. 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