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Aug 24th, 2023
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Joined: Apr 2008
Posts: 11,861 Likes: 137
Scruffy Oik Member of the Inner Circle
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Scruffy Oik Member of the Inner Circle
Joined: Apr 2008
Posts: 11,861 Likes: 137 |
Tim,
At that speed mine is turning over at 3000 rpm in fifth. Does that sound like 3.73? Yes, it does. Mine's doing more like 3500 at 80.
Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE
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Joined: Dec 2011
Posts: 486
Learner Plates Off!
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Learner Plates Off!
Joined: Dec 2011
Posts: 486 |
Tim,
At that speed mine is turning over at 3000 rpm in fifth. Does that sound like 3.73? If yo have a MT75 ford box with the same ratios as my 4/4 sport, then yes? I tend not to use the speedometer as it is not in my line of sight, I use the rev counter which is more accurate. There's a rev's speed table pinned to the dash!
Cain
Wolf Cafe Racer
4/4 Sport
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Joined: Dec 2011
Posts: 486
Learner Plates Off!
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Learner Plates Off!
Joined: Dec 2011
Posts: 486 |
As a road mod I don't think I could live with it on long journeys as the rev's in 5th would be to high at motorway speed.
<snip>
But as a B road Street racer it would be a blast.
The real answer for the road use is torque and BHP.
I kind of agree, Cain, after 3 hours on a motorway at 80mph+ mine can be a bit wearing (although it's the wind blast that's more tiring that the revs) - but it's more than compensated for when you get off, and after all, who buys a Morgan to drive on motorways? They are just a necessary evil to be endured whilst getting to the fun bits... I would have the 4:10 gear change in a hart beat, if I could fit an overdrive unit  best of both worlds then and 10 gears  What am I talking about I can't cope with a six speed box 
Cain
Wolf Cafe Racer
4/4 Sport
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Joined: Mar 2009
Posts: 2,255 Likes: 2
Talk Morgan Expert
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Talk Morgan Expert
Joined: Mar 2009
Posts: 2,255 Likes: 2 |
Cain,
It's a LT77 box on a M16 engine. 2000 rpm =60mph, 3000 =80mph, fifth gear can be used for 30 mph.
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Joined: Dec 2011
Posts: 373
Learner Plates Off!
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OP
Learner Plates Off!
Joined: Dec 2011
Posts: 373 |
2005 PLUS 4 with 3.73:1, Ford gearbox,
130 km/h (80 mph) at 3200 rpm, 74 BHP at 49% of the rpm maximun.
25.10 mph at 1000 rpm. You can find it in the handbook.
For the same speed 80 mph, with 4.33:1 rear axle, you get 89 BHP at 3700 rpm,
plus 15 BHP available with the same motor and at 57% of the rpm maximun.
Regards
2005 PLUS 4
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Joined: Jul 2007
Posts: 28,416 Likes: 178
Salty Sea Dog Member of the Inner Circle
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Salty Sea Dog Member of the Inner Circle
Joined: Jul 2007
Posts: 28,416 Likes: 178 |
Cain,
It's a LT77 box on a M16 engine. 2000 rpm =60mph, 3000 =80mph, fifth gear can be used for 30 mph. Pretty much the same gearing as the R380 on a T16 +4 
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly
'09 Gen2 MINI Cooper ragtop
'90 LR 90 SW
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