Rev counter readings

RIDDLER55 · Jan 4th, 2019, 16:44

Hello. I have got a 1968 1800S. Can anyone tell me what the rev counter should be reading at different speeds? For instance, what it should be reading at 60mph in 4th gear with overdrive engaged?
I have just had mine re-calibrated for electronic points and want to make sure it is now reading accurately. Thanks.

Army · Jan 5th, 2019, 09:20

Quote:

Originally Posted by RIDDLER55

Hello. I have got a 1968 1800S. Can anyone tell me what the rev counter should be reading at different speeds? For instance, what it should be reading at 60mph in 4th gear with overdrive engaged?
I have just had mine re-calibrated for electronic points and want to make sure it is now reading accurately. Thanks.

There are several online calculators that will work this out for you if you plug in the tyre size, differential final drive ratio and gearbox ratios (4th gear will be 1:1) but this still isn't going to be as accurate as using a multimeter (with the given function) and /or a strobe light (also with the given function)

RIDDLER55 · Jan 5th, 2019, 22:54

Thanks for that.
Meanwhile I have had a private message from Volvonic272 but, ridiculously, I am apparently unable to reply to it until I have made 30 posts. So can I ask Volvonic272 (Dave) to call me on 07810 655646 sometime tomorrow? Thanks!

XC90Mk1 · Jan 6th, 2019, 09:21

Quote:

Originally Posted by RIDDLER55

Thanks for that.
Meanwhile I have had a private message from Volvonic272 but, ridiculously, I am apparently unable to reply to it until I have made 30 posts. So can I ask Volvonic272 (Dave) to call me on 07810 655646 sometime tomorrow? Thanks!

The 30 post rule is madness.

fishyboy · Jan 6th, 2019, 12:36

RIDDLERS55,
These might help,
15.9 mph per 100 rpm in 4th
21.1 mph per 1000rmp in overdrive top gear
Source: Autocar July 1966 1800S Test

Phil

Triple-S · Jan 6th, 2019, 13:12

XC90 - no it isn't madness: it keeps those merely wanting free advertising away. Join the club and build up your posts then you can do what you like (within limits!).

P

Jan 4th, 2019, 16:44	#1
RIDDLER55 VOC Member Last Online: Dec 3rd, 2022 08:18 Join Date: Nov 2018 Location: STOCKPORT	Rev counter readings Hello. I have got a 1968 1800S. Can anyone tell me what the rev counter should be reading at different speeds? For instance, what it should be reading at 60mph in 4th gear with overdrive engaged? I have just had mine re-calibrated for electronic points and want to make sure it is now reading accurately. Thanks.

Jan 5th, 2019, 22:54	#3
RIDDLER55 VOC Member Last Online: Dec 3rd, 2022 08:18 Join Date: Nov 2018 Location: STOCKPORT	Thanks for that. Meanwhile I have had a private message from Volvonic272 but, ridiculously, I am apparently unable to reply to it until I have made 30 posts. So can I ask Volvonic272 (Dave) to call me on 07810 655646 sometime tomorrow? Thanks!

Jan 6th, 2019, 12:36	#5
fishyboy Senior Member Last Online: Yesterday 20:55 Join Date: Oct 2013 Location: Andover	RIDDLERS55, These might help, 15.9 mph per 100 rpm in 4th 21.1 mph per 1000rmp in overdrive top gear Source: Autocar July 1966 1800S Test Phil

Jan 6th, 2019, 13:12	#6
Triple-S How Old? Last Online: May 31st, 2021 12:28 Join Date: Oct 2006 Location: redhill	XC90 - no it isn't madness: it keeps those merely wanting free advertising away. Join the club and build up your posts then you can do what you like (within limits!). P

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