Needles, Ratios and LibreOffice Updates...

[ianh1968]

Firstly, the best bit of news that I have had in a while is that the
LibreOffice developers have been busy and have fixed a problem
that I reported a while back...

Some of the "Help Text" on my Needles and Ratios spreadsheets
has not been rendering correctly on all versions of LibreOffice
after version 3.4.5, so much of this handy information has not been
visible.

The next version of LibreOffice, ie 5.3, is about to be released and
will contain the fix - Watch this space...

In the meantime, I have been working on updated versions of both
Needles and Ratios and would be grateful for a small amount of
assistance/information if any members here can help.

Needles:
Any Stromberg users out there?
I bought the latest charts from Burlen and they list a needle called "45P"
twice, but with two completely different sets of diameter values.
If anyone has a set of needle charts for the Stromberg/Pierburg CD range
and these contain "45P", I'd be pleased to hear from you.

Ratios:
(1) I am looking to update the list of available drop gears and cannot find the
old post about the "economy" primary gear. This had 30 teeth, vs. the 29
teeth of the standard offering, but wasn't there a First Motion Gear with 28
teeth that could provide a double-overdrive?

(2) I currently have a modest list of tyre size (WRPM) values which are used
for accurately working out road speed and also in speedometer calibration.

Any additions to this would be gratefully received, this is what I have already:
(Plus the Dunlops from an ST Manual)

Code: Select all

Selection of Tyres suitable for a Mini
======================================

145/80R10: Falken Sincera SN807
Rolling Circumference: 1490mm (1080WRPM)
Source: http://www.falkentyres-uk.com/ (831A 807 fko7eu.pdf Downloaded 25/11/2014)

165/70R10: Falken FK07E
Rolling Circumference: 1475mm (1091WRPM)
Source: http://www.falkentyres-uk.com/ (831A 807 fko7eu.pdf Downloaded 25/11/2014)

165/70R10: Yokohama A008
Rolling Circumference: 1495mm (1076WRPM)
Source: http://www.yokohama.co.uk/Contact-Us (Email Reply 26/11/2014)

145/70R12: Michelin XM2
Rolling Circumference: 1553mm (1036WRPM)
Source: http://www.michelin.in/tyre/viewall/525 (Website Page 26/11/2014) 

165/60R12: Falken ZE912
Rolling Circumference: 1535mm (1048WRPM)
Source: http://www.falkentyres-uk.com/ (912.pdf Downloaded 25/11/2014)

165/60R12: Yokohama A539
Rolling Circumference: 1531mm (1051WRPM)
Source: http://www.yokohama.co.uk/Contact-Us (Email Reply 26/11/2014)

Compiled by Ian Hamilton, from various sources.
E&OE

This list is for 10" and 12" tyres, but I am aware that Mokes and other 'A' Series
engined cars may have larger rims. I've also got the 13" Dunlops
from the ST Manual... Spider, wot-u-got?

(3) The latest Ratios spreadsheet contains a fairly comprehensive Speedo Drive
facility which allows users to calculate various options available when messing
about with this sometimes confusing issue.

Is there a comprehensive list of speedo TPM values already in existance?
If not, wouldn't it be great if between us we could compile a list?
Even better if this could contain the scale, eg MPH or Km/h, the number and
position of any indicator lamps, gear change markers and any other information
that would be useful to anyone trying to identify or source a speedo...

I know that this is a busy post, so well done if you've managed to stay with it
so far! Any help would be really appreciated...

Ian

[Alex]

There is indeed an input gear with 28 teeth.

[ianh1968]

Thanks, Alex...
Any idea which vehicles it was used in?
Do you have a part number?

Ian

[Alex]

My very late Metro Clubman had a economy input & output gears as well as a 3.2 fd.

I have a NOS Rover 30 tooth primary gear on my desk, DAM 9373.

Looking at some microfiches, it looks like the economy input gear might be DAM 6337 and were used on all 1275s from 1988 onwards except for the MG, MG Turbo, Sport & GTA. '84-'88 I think the 1275 E (HLE?) was fitted with it.
The 998 never got it.

[dodge44]

These tyres are out there as well:

145/80R10 69T: Marshal SR KR11

http://www.marshaltyre.co.uk/kr11-new.php

They don't seem to be listed on their webpage though (Unless I'm looking in the wrong place) but are made in China so that might put a few off. Never given me any gip though and seem to last quite well.

[ianh1968]

What I am trying to do is gather a set of known WRPM values for tyres for a Mini...
Do you know what the official WRPM is for these tyres, or the rolling circumference?
(As opposed to the circumference calculated from the profile which will be inaccurate).

I've added this tyre to the list anyway as it can be used for dual-purpose!

Ian

[ianh1968]

economy input & output gears as well as a 3.2 fd.<SNIP>
I have a NOS Rover 30 tooth primary gear on my desk, DAM 9373.
<SNIP>it looks like the economy input gear might be DAM 6337

Great info, thanks Alex...

DAM6337 Appears correct as MiniSpares are listing used ones on their site...

The 3.211 diff gives:
... with 30/29 = 3.104
... with 29/28 = 3.100
... with 30/28 = 2.996

This begs the question "Why not just use another ratio diff?", particularly for the first
two permutations when a 3.105 diff could be used instead. The 2.966 is quite close
to a 2.950 differential.

Ian

[ianh1968]

Mark F has loaded up the latest versions of "Needles" and "Ratios" onto the main MK1 site...
(Thanks Mark!)

See here:
http://mk1-performance-conversions.co.u ... l_carb.htm
http://mk1-performance-conversions.co.u ... anical.htm

The LibreOffice software has also been updated and bug-fixed in version 5.3.
For anyone using Windows 8 onwards, I seriously recommend an upgrade...
https://www.libreoffice.org/

Needles Release Notes:
2017/02/28
Release 024.Mk1
In certain areas, the spreadsheet now detects which operating system is being
used - This enables Mac-specific help to be displayed as appropriate.
Part numbers added to the data tabs for easy reference. Part numbers are now
also displayed on the "Advanced" tab.
F90 and S90, needle AAA index 7 contained a typo and has been corrected.
Thanks to mk1-forum.net member John Gervais for spotting this and advising me.

Ratios Release Notes:
2017/03/12
Release 006.Mk1
Added gearset "3E12G", 3 Synchro Early 1275 12G Engine (22G714 Laygear)
Added gearset "4HDCR", MiniSpares Centre Heavy Duty Close Ratio Helical.
Added gearset "4KAD1", Dog Box KAD. Source: KAD website as at March 2017.
Added gearset "4MED1", Dog Box MED. Source: MED website as at March 2017.
Added gearset "4QFE1", 4 Synchro SCCR Quaife. 1st=2.877. Probably NLA.
Added gearset "4SEL1", Dog Box Selby Race Parts. Source: Website as at March 2017.
Added gearset "4JKN1", 4 Synchro Jack Knight
Many thanks to mk1-forum.net member "underkut" for providing details for this set.
Annotated all the Swiftune boxes as (Quaife) as they are manufactured by them.
Added "Sequential" mode to tab "Data". This now allows any 5 speed gearset
with or without a "first motion shaft and laygear" setup to be handled.
Added "Tyre circumference to WRPM calibration" to allow geometrically calculated
sizes to be more accurately converted.
Added "Speedo Drive Setup" tool to assist in speedo calibration/gearing issues.
Added standard/helical overdrive drop gears to the list on the "Data" tab.
Many thanks to mk1-forum.net member "Alex" for the steer on this one.
Added pull-down menus on "Main" for drop gears and diff ratios.
Added several 10"-13" tyres to the external WRPM list and changed the layout to
spreadsheet-friendly ".csv" format.
Copyright dates updated to 2017.

[ng850]

Hi, a couple of additions for the Ratios spreadsheet.



The D93J is the common SP Sport/Formula-R version and the D01J is a now discontinued trackday tyre... but one I am currently using on one of my Minis.

The 'revs per mile' are higher than one might expect based on the dimensions but quoted as at 100mph (heading wrapped).
Using the published diameter of 19.2", gives a figure of 1050?

Cheers