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Post by p5tgc on Oct 25, 2013 16:51:23 GMT
Trevor Colebrook calling from Scotland with a request for help on behalf of a P5 Club member who lives in Orkney.
Mr McAulay is a gentleman in his 70s who does not have internet access, and he is wanting to fit a manual gearbox into his P5B, no doubt inspired by the article in the October 2010 issue of Take 5.
If anyone out there has carried out this conversion, either using the Discovery g'box or any other, using readily available parts, would you be willing to contact him and chat about the project?
Could I therefore ask you to ring him, or text your phone number to Mr McAulay if you are willing to chat to him.
His number is 077991 72395.
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Post by Phil Nottingham on Oct 25, 2013 17:21:50 GMT
Why just buy a manual 3 Litre or another manual car - I just cannot see the point when auto-boxes can still be had or reconned
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Post by allanthomas1 on Oct 25, 2013 17:29:29 GMT
I carried out this conversion on my P5B, it is straight forward, I used rover SD1 5 speed box, clutch and brake pedal from a rover 3 litre, clutch master cylinder from SD1, flywheel clutch and pressure plate from Rover SD1, propshaft needs to be lengthened, or a spacer made, I used a spacer approx 2ins.
The awkward part is fitting the box, I installed mine without removing the engine, to fit the gearbox you have to lift the rear of the box first to clear the cross member used for the rear gearbox mounting, then lift the front of the gearbox and slide it forward to line it up with the clutch plate.
Removing the auto box and installing the manual box 2 days work, I had all the parts ready to carry out the conversion.
I am hopeless at downloading pictures, but will get my daughter to give me a hand.
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Post by allanthomas1 on Oct 25, 2013 17:51:16 GMT
Can I say reading Phil's reply a Mk3 3litre manual with overdrive would be in my opinion the best all round option, Rover V8 Auto 3000 rpm 66 mph, Mk3 manual 3000 rpm 75 mph, although the 3litre cannot match the 0 to 60 time on paper it is the better car for motorway work, my V8 with a manual conversion 3000 rpm 80mph.
Having owned and run a Mk2 3litre everyday in the 1970's until early 80's I would prefer a rover 3litre. The engineering in the 3litre is more refined. The Rover V8 I use everyday has been in the family 43 years, my brother bought the car in Barry 1970 with 18,000 on the clock, my father bought the car in 1976 used it for 18 months then put the car in the garage because it failed an MOT on the top ball joint he would not pay £35.00 for a replacement, I bought it in 1997 and carried out a restoration on it and used it ever since.
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Post by seadog on Oct 26, 2013 17:56:06 GMT
Converted my P5B to manual.Used the gearbox ,flywheel and clutch from a Grinal converted TR8.Fairly straightforward job.We have a lift and transmission jack which makes the job easier.As said front propshaft was lengthened and a rear mounting bracket fabricated.Gearlever comes out of the existing gear selector hole.Cut the brake pedal and used a TR7 clutch master cylinder(and TR7 clutch lever).Car now performs as it should with a V8 under the bonnet. Cruising is more relaxed with the higher top gear.I imagine,if B.L.had access to the LT77 gearbox when the P5B was in production,then it would have been offered as an option.
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Post by poodumrover1 on Dec 19, 2013 23:23:57 GMT
Trevor Colebrook calling from Scotland with a request for help on behalf of a P5 Club member who lives in Orkney. Mr McAulay is a gentleman in his 70s who does not have internet access, and he is wanting to fit a manual gearbox into his P5B, no doubt inspired by the article in the October 2010 issue of Take 5. If anyone out there has carried out this conversion, either using the Discovery g'box or any other, using readily available parts, would you be willing to contact him and chat about the project? Could I therefore ask you to ring him, or text your phone number to Mr McAulay if you are willing to chat to him. His number is 077991 72395. |
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Post by poodumrover1 on Dec 19, 2013 23:31:06 GMT
My P5b runs 1,700 - 1,800 @ 50mph / 2,000 - 2,100 @ 60mph to ~ 2,500 @ 70mph = Is this normal ?
I thought the differential maybe modified ?
Gearbox same BW35
4litre motor 9.35.1 compression using Edelbrock 500cfm
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Post by harvey on Dec 20, 2013 14:14:33 GMT
Maybe as a simpler solution you may advise your friend to fit a 3litre differential which has different ratios to 3.5litre - my P5b runs 1,800 @ 50mph / 2,200 @ 60mph / 2,500 @ 70mph without compromising acceleration too much so long as kick-down works correctly ! Apart from the Mk3 which had the same ratio as the V8, all the other 3 Litres have a lower ratio diff (higher numerically), which will make things worse, not better. |
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Post by norvin on Dec 20, 2013 17:58:17 GMT
I must say I agree with phil surely it's the auto box that makes these cars what they are.
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Post by allanthomas1 on Dec 20, 2013 18:28:39 GMT
The main reason why I changed my car over to a manual gearbox I thought it would be better for towing, although a Mk3 3 litre manual with overdrive would be a good option, a 3.5 V8 is suited to the auto, a modern 4 speed auto might be the better choice instead of a manual conversion.
although there is so much low down torque from the V8 its just like driving an auto, it will pull in fifth gear from as low as 30mph.
Happy Christmas, Happy New Year.
Allan Thomas
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Post by norvin on Dec 20, 2013 18:39:26 GMT
You just can not beat an automatic car for towing they can move weight so easy, and hill starts are also very easy.
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Post by harvey on Dec 20, 2013 18:51:09 GMT
and hill starts are also very easy. Especially on Rovers as they have a hill start facility so they can't roll backwards. |
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Post by seadog on Dec 28, 2013 13:56:47 GMT
I have used many cars ror towing. Automatics include Daimler 420, Rover800, Rover3500, RoverP5B,Rolls Royce Silver Shadow and Land Rover Dicovery3.9V8.I have found all to be far from ideal. O.K.with light weights,no use for serious towing.I have converted my present P5B to a manual box(LT77)and it is greatly improved both as a towing vehicle and for general use.No doubt the new automatic cars are better,but I dont drive autos any more,so I cant comment.As an asside,the best towcar I have ever owned was a Volvo 940 manual diesel estate.It put up with massive abuse was comfotable even with a 2 ton tractor on an Ivor Williams,and ran over 250,000 miles.
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Post by djm16 on Dec 31, 2013 1:50:11 GMT
Ah, you can't beat a 4-litre diesel Landcruiser! I have towed 10 ton tree trunks around the block with mine! (in low range, 4WD and locked hubs).
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Post by seadog on Jan 3, 2014 13:44:29 GMT
Agreed,the Landcruiser is awsome. The Range Rover is not bad,but the diesel is underpowered for towing.The P38 with autobox only just copes without a trailer. With a trailer it is a slug. Obviously,modern autos which have no torque converter have less power losses.
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Post by seadog on Jan 11, 2014 20:13:39 GMT
Just to add. Fitting the lt77 gearbox was easy. The only tricky bit was making a gearbox rear mount without altering the structure of the car. Also lengthening the front propshaft(both done in our own workshop) The clutch slave cylinder is a TR8 unit,but the clutch pedal was tricky. I did not want to mod the brake pedal mounts.This does not leave a lot of space for the clutch pedal,even when the brake pedal is cut to fit Discovery rubbers(They say Rover on them) The problem is to be able to use the dip switch in its origional position. To achieve this I fabricated a slightly shorter pedal than the brake. Sounds odd and needs more pedal pressure,but works O.K. Obviously I could relocate the dip switch,but I wanted to keep the car as origional as possible,within the constaints of the manual conversion.
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Post by poodumrover1 on Feb 10, 2015 0:04:08 GMT
Maybe as a simpler solution you may advise your friend to fit a 3litre differential which has different ratios to 3.5litre - my P5b runs 1,800 @ 50mph / 2,200 @ 60mph / 2,500 @ 70mph without compromising acceleration too much so long as kick-down works correctly ! Apart from the Mk3 which had the same ratio as the V8, all the other 3 Litres have a lower ratio diff (higher numerically), which will make things worse, not better. My P5b runs 1,700 - 1,800 @ 50mph / 2,000 - 2,100 @ 60mph to ~ 2,500 @ 70mph = Is this normal ? I thought the differential maybe modified ? Gearbox same BW35 4litre motor 9.35.1 compression using Edelbrock 500cfm Read more: roverp5.proboards.com/thread/7791/p5b-manual-gearbox-conversion?page=1#ixzz3RIOyMJxh |
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