Uphill Racers

Go Back   Uphill Racers > Technical > Engine & Chassis
Register FAQ Members List Calendar Downloads Mark Forums Read

Reply
 
Thread Tools Display Modes
  #21  
Old 31-08-10, 18:40
Major Mallock's Avatar
Major Mallock Major Mallock is offline
Member
 
Join Date: Feb 2007
Location: Preston Lancs
Posts: 99
Major Mallock is on a distinguished road
Fastest PO Van in the west,

Not wishing to contradict anyone, but having had a Mallock with Ford/BMC composite diff, this is one of my specialist subjects. does not stop me from being wrong though.

The P.O Van were fitted with a 5.3 diff because they were low powered but still needed to climb steep hills. (a 3.55 would give them a very high top speed, but only if the engine could pull the rev, which it could not)
3.55 Special tuning for Tulip and Targa Florio.. Hens Teeth.
3.7 Riley 1.5
3.9 Later Spridgets
4.2 and 4.5, mixture, A35, M1000, A40 Spridgets etc.
Fitting the Ford planet gears to BMC crown wheel requires machining, but use the toughened Ford planet gear, shown with a little Diamond on the casting.

However if you want a 3.5, ask ADR who have manufactured a batch to fit in there Mk 1/2 and 3 sports racers when fitted with motorbike engines. They aslo made a 2.9
__________________
APV Major
Reply With Quote
  #22  
Old 31-08-10, 19:22
Hasta Hasta is offline
Senior Member
 
Join Date: Jan 2007
Location: Worcester
Posts: 1,731
Hasta is a jewel in the rough Hasta is a jewel in the rough Hasta is a jewel in the rough
Quote:
Originally Posted by Major Mallock View Post
Not wishing to contradict anyone, but having had a Mallock with Ford/BMC composite diff, this is one of my specialist subjects. does not stop me from being wrong though.

The P.O Van were fitted with a 5.3 diff because they were low powered but still needed to climb steep hills. (a 3.55 would give them a very high top speed, but only if the engine could pull the rev, which it could not)
Going slight off tack . I had > 85 MPH out of my fully laden PO telephones Moggie van down the hill from Upper Sapey to Stanford Bridge ( just round the corner from Shelsley ) Don't know what diff was fitted but slowing at the bottom of the hill was interesting to say the least . Going up the same hill was a second or first gear job .

Happy days

Hasta
__________________
I now know a liitle more about using an extinguisher
Reply With Quote
  #23  
Old 31-08-10, 20:24
beggers beggers is offline
Junior Member
 
Join Date: Jul 2010
Posts: 14
beggers is on a distinguished road
Quote:
Originally Posted by dennis.doyle View Post
Looks from Minitici’s figures you can avoid an axle swap which is good. However, would obviously be nice to have the option of changing final drive for different tracks. No need to take apart to find the ratio. Should be stamped on the nose piece: 11/41 means 3.7 10/39 means errm 3.9

There, just saved you the price of 3 paper gaskets.
I couldn't see it anywhere, I marked out the floor and counted prop shaft turns. Did it 4 times and made it just over 4.5 prop turns for 1 revolution of the wheel, which would check out as a 4.55 i guess? I remember hearing it may have had a postal van diff when I got it....

20" rolling dia would make it approx 85mph flat out, would you need or want more speed than that for many venues?

Last edited by beggers; 31-08-10 at 20:27. Reason: Spelling
Reply With Quote
  #24  
Old 31-08-10, 20:26
mudplugger's Avatar
mudplugger mudplugger is offline
Junior Member
 
Join Date: Jan 2010
Posts: 3
mudplugger is on a distinguished road
Fiat Panda back axle

If you want a very tall 3:1 diff then try the back axle off Fiat Panda. We have been using one in a Sporting Trials car. Totally wrong really so we built a 3.6:1 reduction chain box as well. We have just changed to an A30 axle 4.2:1 so we can run a higher gear. Anyway back to your stuff.

The Panda axle is very heavy at about 40kg so we cut the axle tubes and welded in some lighter sections (saving 6kg). You may be able to make the guts fit a more std casing.

Website for the Shelsley Bug here www.mudplugger.webs.com

Best of luck M@
__________________
M@
Reply With Quote
  #25  
Old 31-08-10, 21:37
33JOY's Avatar
33JOY 33JOY is offline
Senior Member
 
Join Date: Apr 2007
Posts: 112
33JOY is on a distinguished road
Here's a Hewland cam & pawl LSD unit designed to accept the range of BMC crownwheels being discussed, but the internals of which use the multi-spline Ford ˝-shafts:



I'm pretty sure that this sort of thing was commonly fitted to Mallocks at one time but I'm equally sure that someone will correct me if I'm wrong!

Peter
__________________
Ground effect SUCKS
Reply With Quote
  #26  
Old 01-09-10, 20:55
Major Mallock's Avatar
Major Mallock Major Mallock is offline
Member
 
Join Date: Feb 2007
Location: Preston Lancs
Posts: 99
Major Mallock is on a distinguished road
Quote:
Originally Posted by carl talbot View Post
Moggy GPO vans used 4.55 , 4.9 or 5.1 ratios
some A30's had 4.55 or 4.9 ratios
3.9:1 is std midget

I am interested in finding out what the Mallock Ford/BMC conversion is,
I assumed they only used the Ford diff in the BMC carrier as this would retain the nice lightweight ally diff nose ?
5.1 was a special tuning one, I broke the last one in captivity, but then it was ex Roy Lane and must have seen a hard life before I got it.

Retention of the ally nose was the reason to do it rather than simply convert to a ford axle. the down side is the big issue of then having to fit ford splined half shafts!!
__________________
APV Major
Reply With Quote
  #27  
Old 01-09-10, 23:12
beggers beggers is offline
Junior Member
 
Join Date: Jul 2010
Posts: 14
beggers is on a distinguished road
Quote:
Originally Posted by Major Mallock View Post
5.1 was a special tuning one, I broke the last one in captivity, but then it was ex Roy Lane and must have seen a hard life before I got it.

Retention of the ally nose was the reason to do it rather than simply convert to a ford axle. the down side is the big issue of then having to fit ford splined half shafts!!
Update, I've decided to get a few more MPH and got a 3.63 ital diff lined up, should give me just over 100mph.

Any idea best place to get the 3 gaskets?

My 4.55 will be up for sale also.
Reply With Quote
  #28  
Old 02-09-10, 06:54
dennis.doyle's Avatar
dennis.doyle dennis.doyle is offline
tyrekicker
 
Join Date: Jan 2007
Location: I'd rather not say
Posts: 1,106
dennis.doyle is on a distinguished road
The rubber 'O' rings are handy too.

You might be able to get them through a standard motor fator or someone on BTDBTDBTDBTD, but failing that, any of the Morris Minor or Spridget specialists do them:

http://www.morris-minor.co.uk/p269.htm

http://www.moss-europe.co.uk/Shop/Vi...eIndexID=17078
__________________
Plugging Scammonden as if my life depended upon it
Reply With Quote
  #29  
Old 02-09-10, 07:37
guilleracing's Avatar
guilleracing guilleracing is offline
Senior Member
 
Join Date: Oct 2009
Location: Guernsey channel islands
Posts: 544
guilleracing is on a distinguished road
BMC Diff.

Hi,


I have a 3.15 ratio BMC diff available if that is any use.

(YES it really is a 3.15)

I am away for a couple of days testing in france but I could look it out on my return.

Greg.
Reply With Quote
  #30  
Old 03-09-10, 17:52
beggers beggers is offline
Junior Member
 
Join Date: Jul 2010
Posts: 14
beggers is on a distinguished road
Quote:
Originally Posted by guilleracing View Post
Hi,


I have a 3.15 ratio BMC diff available if that is any use.

(YES it really is a 3.15)

I am away for a couple of days testing in france but I could look it out on my return.

Greg.
What was the 3.15 fitted to?

Cheers
Reply With Quote
Reply

Tags
atlas , axle , bmc , clubmans , mallock

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 05:18.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright© 2007-2017 www.uphillracers.com