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17099Re: [multimachine] Re: cooling concerns

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  • Adam Simmons
    May 8, 2013
      I doubt it would make any difference, but the critical tolerance for heat is piston to cylinder wall -- especially since the aluminum piston expands at a faster rate than the surrounding steel cylinder. Older engines left a lot of space between the piston and cylinder wall, and in search for more efficient, cleaner and quieter engines they've shrunk up that tolerance over the years. 

      So, let's say they had .008" before, you probably have .005" now, and that's a big difference when it comes to overheating a motor. Now, cylinders today are much straighter, and the pistons should be designed to limit growth, but the rough idea is that smaller gap, less room to expand.

      Lets' not forget this is air directly above water, which will have a high humidity and fantastic thermal transmission capabilities, not to mention be cooler than air over land.  I don't forsee a problem.

       - Adam

      On Wed, May 8, 2013 at 1:17 AM, HB <scfpigs@...> wrote:

      I don't see that making any difference in the use of old or newer air-cooled small engines
      They are also using modern small engines NOW without any extra cooling modifications just like the way they did with the older engines.

      From: greg123452003 <greg123452003@...>
      To: multimachine@yahoogroups.com
      Sent: Tuesday, May 7, 2013 10:47 PM
      Subject: [multimachine] Re: cooling concerns


      --- In multimachine@yahoogroups.com, HB <scfpigs@...> wrote:
      > Small lawnmower type engines have been extensively used for fishing boats in Southeast Asia for more than half a century without any special cooling system modifications.
      > I don't see why this is now a modern concern.
      Because modern engines use much tighter clearances.

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