Does it matter if you drive on a cold engine keeping it under 3000 rpm, or do most of you wait until the car is warm up then drive it. I always wait about 10 minute and let it idle before i drive it, does it make a different driving on a cold against letting it fully warm up? like lifespan of the engine? I also have the bottom end built so when i drive it cold, the noise is pretty loud lol...

 

yea my built 2.0L bottom end is rough when it isnt warmed up, but it straightens out after a few minutes...i just wait til the idle goes into the cold start idle before i start moving, and by then the thermo opens up at operating temp...

 

i always wait for my car to completely warm up to drive it. It'll idle from about 3k at cold start and slowly drop to 900rpms. It gets kinda jerky since it idles so high when cold anyways to drive it through a parking lot etc..

 

About 60% of engine wear occurs during start-up when the engine is cold. On every built motor I do I always let the engine warm up a few minutes before I drive them. During winter time I usually let the motors warm up for about 5-7 min. I also keep the motors from under boost until normal operating temperature is established.

 

its not wise to drive alot when its really cold, but say when you let it warm up for atleast a couple minutes so the rpm dropp down to say 1,200, and baby it thats probably ok... but not best.... on forged internals the heat expansion of the pistons makes it somewhat smaller in the bore(it varies between pistons too) so when its cold the pistons "rattle" in the bore, causeing wear, cause the pistons are smaking around in the bore....

but all in all, as long as you dont beat on it you should be fine

i knew a guy that warmed him gsr(stock) by keeping it a 6,000 one morning, threw a rod.... not sure how, maybe something else was goin on... but he blew it up just sitting there.... soo cold starts and cold motors are delicate things

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PrecisionH23a &raquo;</TD></TR><TR><TD CLASS="quote">About 60% of engine wear occurs during start-up when the engine is cold. On every built motor I do I always let the engine warm up a few minutes before I drive them. During winter time I usually let the motors warm up for about 5-7 min. I also keep the motors from under boost until normal operating temperature is established.</TD></TR></TABLE>

perfect, thats what i do also

 

I usually let it warm up for a few mins in the morning. If I drive it cold it's nothing hard, and definitely not boost until it's warm. Like when I get out of work, I dont warm it up. But it's also a $100 d series.

 

You can always start driving with a cold engine as long as you keep it at low vacuum until it warms up. I have been doing this for 14 years on my Civic 1990.

Don't waste your time in the parking lot.

 

I always start the car and let it idle for about 30 seconds then drive easy until the car registers full temp. I read a while back that it is not good to idle a car to warm it up for a long period of time.