I guess there is a problem with the gear ratio. On 5th gear what is the rpm at 60 mph on the new PLUS 4?
CBY You may be right: 60mph on mine is 2000 rpm in fifth, 80mph = 3000rpm in the same gear.
CBY / Meabh
To give you an idea - I use custom ratios of:
2.2:1 - 1st
1.54:1 - 2nd
1.21:1 - 3rd
1:1 - 4th
0.87:1 5th
4.1:1 rear diff
205/50/15 rear tyres
This gives use of the full box (just) on longer circuits and a useful 1st at the back hairpin at Curborough. This gives a theoretical top speed of something like 130mph maxing out on top (from what I can remember).
It also means that between shifts the rpm drop brings the next gear in just as the engine comes "on cam". Makes the gearbox fully usable at sensible speeds whilst making the most of the engine dynamics. Many Morgan's could benefit from this rather than the obvious more power.
For road use I would even drop 1st to 2.39:1 to make pulling away slightly easier... With some analysis you'll be able to see how the saloon based gearboxes often used are not ideal for a lightweight "sports car"..... With Morgan often using the final drive in the diff to tune the gearbox to he car - this does not help with ratio suitability within the box though - meaning it often ends up under geared at one end and over geared at the other.
Often described as making 2nd and 3rd usable and 6th for cruising. Turning and 6 speed into effectively a 3 speed - jag anyone?
