[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [New Search]
On 10 Apr 2003 at 8:40, manish tiwari wrote: > Read some interesting comments on the issue of oil coolers . Correctly > said that the main cooling factor is the flow of air . That is why > it is important that the engine be kept clean from grime and mud > deposits รถ a much neglected aspect . It helps in better dissipation > of heat . I never see mud accumulation in engines which have been in use. I think the engine vibration breaks these up and the airflow blows it out. Grime made of oil and dirt is certainly a problem, however. I see a lot of oil coolers which need to have their airflow passages cleaned out. When you first get the engine apart it doesn't look like the cooler could have been doing much, but I've never seen one that was actually completely blocked. > Also read in some VW related FAQ on the Web that painting the > cylinder fins black ( not the block ) helps in better dissipation of > heat . Though there is no scientific justification provided ( perhaps > concept of black body ) Right, it's the black body concept that a good radiant absorber is also a good radiator, but this has to be balanced against the problem that any paint coating there will also be an insulator, so it's not clear how to get the best result. I just leave them bare and let them rust. A nice brown layer of surface oxide is a pretty good radiator, and we have to realize that very little of the heat dissipation is by radiation. Most of it is by direct conduction from the fins to the air. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org