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Restoration-Mini

Technical Forums => Maintenance and Modifications => Topic started by: Hercplt on January 10, 2021, 04:19:35 PM

Title: Smiths 8 cyl tach to 4 cyl???
Post by: Hercplt on January 10, 2021, 04:19:35 PM
Ok... I acquired a Smiths tach (RVI 1000)... its a long story but its marked for an 8 cyl engine.

Question... can this be converted to use on a 4 cyl??
Title: Re: Smiths 8 cyl tach to 4 cyl???
Post by: MiniDave on January 10, 2021, 04:38:24 PM
Sure, probably read half speed tho   ;D

I'm not sure, but maybe you could contact Smiths and ask them?
Title: Re: Smiths 8 cyl tach to 4 cyl???
Post by: BruceK on January 10, 2021, 04:52:48 PM
Must look pretty cool for you to think about using it that way.  Pics? 


I have no idea if this product can help.  I started reading but my eyes glazed over.   

http://vi.raptor.ebaydesc.com/ws/eBayISAPI.dll?ViewItemDescV4&item=141931549970&category=33679&pm=1&ds=0&t=1594481770000&ver=0&cspheader=1
Title: Re: Smiths 8 cyl tach to 4 cyl???
Post by: Hercplt on January 10, 2021, 06:25:11 PM
It is a nice gauge... but I'll likely move it along and source a 4 cyl version...
Title: Re: Smiths 8 cyl tach to 4 cyl???
Post by: cstudep on January 10, 2021, 10:11:41 PM
I modified one the other direction for a guy a few years ago. Not sure if it works in reverse or not. Used a timing light with RPM readout to dial it in.

http://www.britishv8.org/Articles/MGB-to-V8-Tach-Conversion.htm (http://www.britishv8.org/Articles/MGB-to-V8-Tach-Conversion.htm)
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