David,
I believe I have seen it stated here (on list) several times that older
mechanical tachometers routinely read a couple hundred RPM higher than
actual.
Kurtis J.
1963 TR4
Russellville, Arkansas
www.geocities.com/tr4_1963
----- Original Message -----
From: "David Templeton" <davidt@opentext.com>
To: <triumphs@autox.team.net>
Sent: Friday, August 23, 2002 5:59 PM
Subject: Hmm I learned a lesson today
> Hi all,
>
> I want to pass on something I learned today. Since I have had the
Spitfire
> I have trusted the tach to be correct, or at least somewhat correct. I
> hooked an electronic tach up to verify readings and was surprised. The
> indash tach always reads 1000 to 1200rpm with a bouncing needle. I also
> tried to lower the rpm to 850 but would stall.
>
> When I hooked up the electric tach, it turns out that I was actually
idling
> at 600rpm!! No wonder trying to lower would stall :-P Thinking that the
> tach was wrong I verified it against another tach on the Mustang (yes the
> little switch was set correctly :-) )
>
> So, it looks like I will resetting the idle this weekend and not feeling
> like I have her stalling all the time. Nice smooth idle though at 600!
>
> Lesson learned double check the mechanical tach with a verified electronic
> one to set idle speed.
>
> Regards
> David A. Templeton
> '74 Spitfire
> '59 TR3a
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