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| /6 Valve clearence specs. https://slantsix.org/forum/viewtopic.php?t=4014 |
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| Author: | Paul Bodmer [ Tue Aug 06, 2002 6:19 am ] |
| Post subject: | /6 Valve clearence specs. |
Hi, I am looking for info as to why the clearence is so large on the most water cooled motors. I now have a 78 LeBaron with a /6 225 motor. Many of my previous cars have been air cooled VW's with valve clearence set to .006 - .008 for both intake and exaust. This is set cold and I never had a burned valve. Thank you Paul Bodmer raven@empire.net |
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| Author: | bud L. [ Tue Aug 06, 2002 7:56 pm ] |
| Post subject: | Re: /6 Valve clearence specs. |
Quote:
: Hi, : : I am looking for info as to why the clearence : is so large on the most water cooled motors. : I now have a 78 LeBaron with a /6 225 motor. : Many of my previous cars have been air : cooled VW's with valve clearence set to .006 : - .008 for both intake and exaust. This is : set cold and I never had a burned valve. : : Thank you : : Paul Bodmer I think it's a little like comparing apples and oranges. In a VW you have an alloy block, cast iron cylinders, alloy heads, and small valves. In an average slant you have a cast iron block(with integral cylinders) and head and really long push rods. I believe the amount of thermal expansion is dependant upon the change of temperature, the coefficient of expansion of the material, and the size of the material sample. I don't have my Machinery's Handbook on me right now, but I am pretty sure cast iron 'grows' alot less than aluminum/ magnesium alloy for the same temperature change. My guess is that when the VW is warming to operating temperature everything alloy grows at such a rate that the (relatively small)cold setting clearances remain adequate even when the engine is hot. What are the clearances when hot? fglmopar@aol.com |
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