Re: [AMC-list] engine rpm versus mph

[Wrambler <wrambler242@xxxxxxxxxxx>]

Sounds like the tach and dist are not getting along.
With a tach that old I have never had one work correctly.
I have an Autometer I bought circa 1979 and it is way wrong.
Had a stewart warner tach that did the same thing.
It was like they were running through molasses and then they would bounce up
only to drop back down.

If you've got access to a spare I'd ship it off for a thorough redo and
calibration. Maybe have them swap in new guts? Then it would work with
 most any ignition.

As for accurate mph, most any GPS will show you that, I have two apps
on my android that show speed and while they have a slower reaction time
then my speedo in the Jeep they are dead on accurate.

I've been meaning to send out my Sport cop speedo to have it calibrated, but always forget till spring is here.
It reads high on the speed and low on the odometer! No way to calibrate that out since it is electronic and you
program it off of marked 2 mile stretch.

Mark Price
Morgantown, WV 26508
1969 AMC Rambler, 4.0L, EFI, T-5
2004 Grand Cherokee Laredo, 4.7L, Quadratrac II
"I realize that death is inevitable.
I just don't want to be around when it happens!"

----- Original Message -----

> From: "Joe Fulton" <piper_pa20@xxxxxxxxxxx>
> To: "Rambler AMC, Nash, Jeep and family" <amc-list@xxxxxxxxxxxxxxxxx>
> Sent: Tuesday, April 12, 2011 11:33:44 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
> 
> 
> 
> ----- Original Message ----
> From: Sandwich Maker <adh@xxxxxxxxxxxxxxxxx>
> To: amc-list@xxxxxxxxxxxxxxxxx
> Sent: Tue, April 12, 2011 6:03:06 AM
> Subject: Re: [AMC-list] engine rpm versus mph
> 
> " From: "Armand Eshleman" <aje1@xxxxxxxxxxxxxxx>
> " 
> " []
> " 
> " 
> " 2,87 axle ratio = 1630 rpm
> " 
> " []
> " 
> " the curious thing about this information is the tach (factory in
> dash) for 
> " the white 70 Javelin reads about 2100 rpm at 70 mph using the 2.87
> axle and 
> " T5 in 5th gear.
> " 
> "  Apparently there are issues with the tachometer. That becomes very
> real 
> " when noticing the tach with bounce up 300 to 500 rpm without using 
> " additional throttle.
> " 
> " I'm using a MSD Pro Billet ready to run distributor that needs no
> translator 
> " box for the tach.
> 
> possible it's not really suitable for -this- tach?
> 
> " Makes me think the electrics for the tach are a bit unstable or the
> system 
> " ground is intermittently or always a bit resistive.
> " 
> " Got any ideas?
> 
> first thought - after all this time, the tach needs recalibration.
> components age and drift, contacts get dirty...  if it has
> electrolytic capacitors, they don't age at all gracefully and
> probably
> need replacing.
> ________________________________________________________________________
> Andrew Hay                                  the genius nature
> internet rambler                            is to see what all have
> seen
> adh@xxxxxxxxxxxxxxxxx                      and think what none
> thought
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