| [GMCnet] 2 interesting topics. Warming up your engine before leaving the drive. Piston travel. [message #326856] |
Thu, 07 December 2017 14:56  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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We were with some GMC people last weekend. And it was mentioned that one person wouldn't leave till the engine was to full operating temps. It's true that there is less wear at full engine temp. But that temp is reached much faster while driving. As there is more fuel burned while on the move. Thus the engine has more BTU's used up in the process. The cylinder walls, an pistons have had 2000 degrees put to them. As to the oil getting moved around. In one minute. The oil filter, and all oil passages were full to start with. The oil pump has delivered about another 6 qts to get every moving part lubed. The engine has had the crank rotate around 700 times in that minute.. I'm sure there are lots of thoughts on this one. I use the one minute idea. One of the things that help these engines last so long. ( As long as there maintained properly.) Is you don't use them for short trips. Thus less cold starts per mile. As a interesting side note. The 403 piston travels less feet per mile then a 455. So does a 403 piston/rings last longer? Bob Dunahugh 78 Royale.
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