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MG MG Y Type - RPM

I have a 1953 MG YB with T9 5 speed gear box.
I am looking for a chart/data as to the Engine RPM at given speeds in each Gear.
The car is running std diff, and 165 std tyres.

thanks in advance.
Vaughan Rich
V Rich

Not much use to you but my YA ignition sensor rev counter indicates 2000 revs at 30mph in 4th gear, I think the type 9 gearbox 5th gear is .83 ratio so a bit of complicated arithmetic should come to 36mph
Bryan
B Mellem

Hello Vaughan,
I developed an Excel Spreadsheet for these calculations, where you can insert all the variables - diff ratio - gearbox ratio - rolling diameter.

I will talk to Paul Barrow about making it available in some way on the website.

In the meantime, if you send me an email via the IMGYTR website "Contacts", I can send you a copy directly.

Safety Fast

Tony Slattery
The Classic Workshop
Down Under Rep for IMGYTR
A L SLATTERY

The data is already there in "Hints & Tips" under "Higher Rear Axle ratios".

It's not a "live" spreadsheet, but you will have some answers there.

There is so much information on the website, it's hard to remember it all - and available for free....

Thanks Paul Barrow

Cheers

Tony Slattery
The Classic Workshop
A L SLATTERY

Assuming standard diff ratio 5.125:1 and standard Ford type 9 five speed gear box.
1st gear; 3.65:1. 3.95 mph/1000rpm.
2nd gear; 1.97:1. 7.32 mph/1000rpm.
3rd gear; 1.37:1. 10.53 mph/1000rpm.
4th gear; 1:1. 14.42 mph/1000rpm.
5th gear; 0.82:1. 17.59 mph/1000rpm.

However, the 165x15 tyres have a diameter that is 2% larger than the original 5.50x15 tyres, so the above figures can be increased by 2%.

Still very low - useful to change the diff to 4.875:1 or 4.555:1.
R WILSON

Hi Tony Slattery.
Please email me a copy of the XL spread sheet. I could not find your email address (just me not used to this website). My email address is rich3nz@btinternet.com

Thanks to all others that have replied, the info is much appreciated.

Regards Vaughan.
V Rich

Vaughan

No need to have it emailed - check out https://www.mg-cars.org.uk/imgytr/hints&tips.shtml#Higher_ratio_rear_differential.

At the end of the thread/hint there is a link there for you to download it as a PDF file.

Paul
Paul Barrow

Thanks Paul.

Regards
Vaughan
V Rich

This thread was discussed between 29/03/2022 and 03/04/2022

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