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Fancy a 6 Speed Gearbox? here's how

User avatar
JohnM
Posts: 96
Joined: Thu Feb 11, 2016 1:31 pm
Location: N W London

Re: Fancy a 6 Speed Gearbox? here's how

Post by JohnM » Mon Sep 23, 2019 8:24 pm

Good skills and nice work, Dave!

I don't recognise the wishbone brackets, but they look proprietary - Triumph?

Cheers, John
John M in Middlesex, NW London
1962 SP250 "B" Spec

peterbee
Posts: 18
Joined: Wed Oct 25, 2017 11:37 pm
Location: Dunfermline Scotland

Re: Fancy a 6 Speed Gearbox? here's how

Post by peterbee » Mon Sep 23, 2019 11:36 pm

To get back onto topic, your mph per thousand rpm. Can we assume you have a standard 3.58 rear axle. If you tell us what size tyres you have fitted then a simple calculation will give the answer to the question.

DaveM
Posts: 28
Joined: Thu Oct 27, 2016 3:36 pm
Location: Haslemere, UK

Re: Fancy a 6 Speed Gearbox? here's how

Post by DaveM » Tue Sep 24, 2019 8:28 am

Hi Peter,

Here you go, theoretical shift points and mph/rev'. Will compare against actuals
SHIFT POINTS VS REVS 2.jpg
John, lower wishbone brackets are home made brackets

Cheers Dave

User avatar
SteveW62
Posts: 93
Joined: Sat Feb 13, 2016 5:45 pm
Location: Germany

Re: Fancy a 6 Speed Gearbox? here's how

Post by SteveW62 » Sun Nov 10, 2019 1:21 pm

Guys,

Many years ago, I raced an MG Midget. I wrote this webpage to calculate speeds & Rpms etc


http://www.fisc-racing.com/misc/ratios.html

you may find it useful.

S.

daimlersteve
Posts: 365
Joined: Wed Mar 09, 2016 11:20 am

Re: Fancy a 6 Speed Gearbox? here's how

Post by daimlersteve » Sun Nov 10, 2019 8:45 pm

good work and well presented. Steve

grahamemmett
Posts: 663
Joined: Mon Feb 08, 2016 8:12 pm
Location: Northwich, Cheshire
Contact:

Re: Fancy a 6 Speed Gearbox? here's how

Post by grahamemmett » Mon Nov 11, 2019 11:17 pm

Jeeeeeeezzzzz.
You deserve a medal for that.
Even to be brave enough to attempt it.
Graham Emmett
Northwich, Cheshire
Joint DB18 Registrar (with Marcel Renshaw)
DB18 1949 LCV522 (Yes that one with the P100s)
https://www.db18.org

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