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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5736
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
hank wrote:
excossack wrote:
https://www.ashcroft-transmissions.co.uk/calc/ratio_calc.html


Thanks I hadn't seen that.

1.2 ratio, 6th gear @ 80mph = 2593rpm
1.1 ratio, 6th gear @ 80mph = 2356rpm
-237rpm difference.

1.2 ratio, 1st gear @ 10mph = 2378rpm
1.1 ratio, 1st gear @ 10mph = 2160rpm
-218rpm difference.

Worth it?


Now workout the theoretical fuel saving based on the reduced RPM.... 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #792719 13th Sep 2019 9:42am
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hank



Member Since: 12 Sep 2016
Location: South Wales
Posts: 2224
Wales 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
Yeah I hear you, but for me it's not so much about fuel savings as for drivability > 110 XS Double Cab
> Instagram @simonlanemind
Post #792720 13th Sep 2019 9:50am
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sako243



Member Since: 08 Jul 2014
Location: Wales
Posts: 1185
Wales 1994 Defender 110 300 Tdi CSW Alpine White
Gear ratios, particularly at motorway speeds, are largely irrelevant for fuel consumption. About a year ago I did work out all the maths and pretty much all of the 100+hp of a Defender engine is going into overcoming aerodynamic losses. The only significant way you're going to change mpg is by dropping your cruising speed. Ed
82 Hotspur Sandringham 6x6
95 Defender 110 300Tdi
Post #792725 13th Sep 2019 10:09am
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BaronDefenders



Member Since: 28 Jun 2019
Location: London/Cotswolds
Posts: 805
United Kingdom 2004 Defender 90 Td5 SW Santorini Black
Our 2.2 110 and Td5 90 both have the 1.2 ratio. The 110 has an Alive Stage 1 map, 235/85/r16 tyres, an AluCab conversion, AluCab 270 awning, 2x 55L auxiliary tanks, and a full length roof rack. When fully loaded it still drives nicely with the 1.2 ratio. It spends a lot of its life in the Alps and the hills aren’t a problem. The Td5 has 285/75/r16 tyres and a Td5inside map. It’s a lot lighter than the 110 but the higher gearing of the 1.2 just makes it a bit quieter on the motorway and town driving is fine. I can still get 5th gear just before 30mph. Charlie

1949 Series 1 80 (SOLD)
2002 Td5 90 (SOLD)
2008 Freelander 2 (SOLD)

1958 Series 2 88 Pastel Green (2019 LR Legends Best Restored)
1983 V8 110 Limestone (Previously owned by Tom Sheppard MBE)
2004 Td5 90 Santorini Black (Td5INSIDE Powered & Rebuilt by CSK)
2012 Puma 110 Zermatt Silver (Overlanding Build)

Instagram: @BaronDefenders
Post #792739 13th Sep 2019 10:42am
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diesel_jim



Member Since: 13 Oct 2008
Location: hiding
Posts: 6031
United Kingdom 2006 Defender 110 Td5 SW Epsom Green
sako243 wrote:
Since then I've snapped two crankshafts s...


O/T...

I changed the timing belt on my 200Tdi years back... a while after the crank snapped on that.

turns out I'd refitted the pump and the timing was 180 degrees out. It ran perfectly, maybe slightly more knock, but not much.

I figure there was a LOT of stress on the crank due to it firing at the wrong time which caused it to break.
Post #792746 13th Sep 2019 11:14am
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Mo Murphy



Member Since: 01 Jun 2008
Location: Letchworth Garden City, Herts
Posts: 2077
United Kingdom 1984 Defender 90 200 Tdi HT Pennine Grey
Ed has special talents Jamie Laughing
Mo The Land Rover 90 - Many are called, few are chosen.
Post #792763 13th Sep 2019 12:02pm
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sako243



Member Since: 08 Jul 2014
Location: Wales
Posts: 1185
Wales 1994 Defender 110 300 Tdi CSW Alpine White
Special pulley Rolling Eyes Ed
82 Hotspur Sandringham 6x6
95 Defender 110 300Tdi
Post #792788 13th Sep 2019 1:51pm
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