[Healeys] Speed to RPM ratio?

[John OBrien]

Thanks to all who replied.  These will give me something to work with.

John

On 6/11/2021 4:26 PM, John OBrien wrote:
> Hi Guys and Gals
>
> I am trying to calibrate my tach.  I installed a Spiyda RVI - RVC 
> conversion board, because my tach was acting wierd.  Anyway, I am 
> still trying to get this setup to read correctly.  My question is, on 
> my BJ8 with standard 3.9:1 diff. what should my RPMs be in fourth gear 
> going 50 MPH , without overdrive engaged.  I'm running 165/80R15 
> tires. I'm just looking for a reference point to compare what should 
> be, and what I am reading.
>
> Any help is appreciated.
>
> Thanks
>
> John
>
-- 
John O'Brien
'61 Bugeye (Lucy)
'65 BJ8 (Madelyn)