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Re: Preheating
Posted by Bob Davis (more from Bob Davis) on Wed, 4 Dec 2002 22:28:49
In Reply to: Preheating, Annie, Wed, 4 Dec 2002 15:43:41
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Every recommendation I've ever read about this subject, whether from the manufacturer or a car-mag article, leans toward a short idle period (maybe 30 seconds) and gentle driving until the engine is thoroughly warmed up.
Yes, this is partially in obeisance to environmental concerns, but there are other reasons too.
Regardless, a heavy foot when the engine is cold can cause uneven warm-up that can spawn head-gasket problems, etc., not to mention the fact that not all parts are at their ideal, expanded operation points when cold.
To me, "thoroughly" means when the oil is up to temp (150°F is my rule), not just the water, which warms up much more quickly. In fact, my Aero's funky ECU-filtered water-temp gauge hits the normal point (about 8:30 on the scale) when water temp is far below the 194° thermostat opening temp. I know because I have a VDO gauge downstream of the thermostat and can monitor the water temp on both sides of the thermostat.
Most wear on an engine occurs when the car is first cranked after an extended (like overnight or longer) period of inactivity. Once cranked, I feel you can proceed with care until warmed up, which could be five or more miles after a cold crank. Prolonged idling will increase warm-up times and will thus keep the fuel system in an enriched mode longer. This could cause cylinder washing and more contamination of the oil in older carbureted engines with conventional choke mechanisms, but I would imagine this would be a lesser worry in modern FI cars.
posted by 68.11.251...
Posts in this Thread:
- Preheating, Annie, Wed, 4 Dec 2002 15:43:41
- Re: Preheating, Quasi, Thu, 5 Dec 2002 11:15:53
- Heater?, Tapani, Thu, 5 Dec 2002 02:17:31
- Re: Preheating, Bob Davis, Wed, 4 Dec 2002 22:28:49 <-- Viewing This Message
- Re: Preheating, Ari , Wed, 4 Dec 2002 17:05:29
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