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Re: [Tigers] Engine Temperature

To: "Carmods@aol.com" <Carmods@aol.com>, "todbrown@roadrunner.com"
Subject: Re: [Tigers] Engine Temperature
From: "Smit, Theo" <Theo.Smit@dynastream.com>
Date: Thu, 21 Oct 2010 08:17:59 -0500
Hi all,
As Tod noted, resistors used in the temperature sender or fuel tank sender
circuit can pull quite a bit of current and they should be appropriately rated
or else they'll get too hot.

I forget offhand what the minimum resistance in the gauge circuits is, but I
think that the maximum current can be on the order of 1/4 to half an amp. In
that case, a 4 ohm resistor would dissipate one watt (1/2 x 1/2 x 4 = 1). That
doesn't mean that a one-watt resistor is sufficient power rating, since that
power rating is typically obtained when the case temperature of the resistor
is 75 degrees C or higher (that's like 160 F or something). You should
probably use a 2, 5, or 10 watt resistor to keep the temperature rise under
control and prevent inadvertent burns or melting of other underdash parts.

Cheers,
Theo
________________________________________
From: tigers-bounces@autox.team.net [tigers-bounces@autox.team.net] On Behalf
Of Carmods@aol.com [Carmods@aol.com]
Sent: Thursday, October 21, 2010 7:06 AM
To: todbrown@roadrunner.com; tigers@autox.team.net
Subject: Re: [Tigers] Engine Temperature

Tod,
I have used a resister approach to calibrate the temperature gauge like you
 did but I found that if I put shrink wrap on resistors it may burn off so
now I leave resistors exposed to air.

John Logan




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