Re: [AMC-list] engine rpm versus mph

["Armand Eshleman" <aje1@xxxxxxxxxxxxxxx>]

----- Original Message ----- 
From: "Joe Fulton" <piper_pa20@xxxxxxxxxxx>
To: "AMC, Rambler, Nash, Jeep and family" <amc-list@xxxxxxxxxxxxxxxxx>
Sent: Tuesday, April 12, 2011 10:33 AM
Subject: Re: [AMC-list] engine rpm versus mph


Another thought? In addition to the "bouncy" tach, are you really doing 70
mph? Do you have the correct speedo gears? Have you run a measured mile to
check?

Joe Fulton



I know I have the wrong speedo gear, but, yes I have done the measured mile 
thing and compared side by side speeds with a known accurate car.
The speedo is off about 5 mph, so I allow for that variation when descibing 
the tach reading 2100 at 70 (speedo reading 65).
Heck, I guess I should be more thankful the tach works at all ! it is 41 yrs 
old after all, and never been apart.

Armand

added note, I have conversed with the people at Tremec about speedo gears 
and they've said they can calculate the correct gear needed if I give them 
the varibles,
tire diameter, final drive ratio etc. good to know when I get it decided 
which final ratio will go into the AMC20 axle 

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