Posted by Texasmark1 on June 16, 2016 at 17:56:30 from (198.45.234.19):
In Reply to: New JD with Briggs posted by Russ from MN on June 15, 2016 at 06:59:35:
I just repowered a couple of conventional mowing machines running around 8-900 hours of hard mowing. ebay had B/S 656 cc V twins in the 18-20 hp range for $5-600 new with free shipping. Nice engines, replacements for Kohler Courage 20 single and Command 17.5 single; much much smoother running and powerful.
Currently running around 50 hours on them and was running them hard last week. So I thought I'd whip out the HF non-contact infrared thermometer gun and have a look see as to how a non-broken-in engine of today's design was holding up to some serious stress. Immediately after hard runs of an hour or so, in high, thick grass on very hilly terrain, I drove each in turn in the shop and measured several points. Highest reading was 187F near the bottom of the crankcase on one, the other didn't get that hot. Will admit the crankshaft fan runs a lot of air but I had no idea a new engine could do that kind of work and stay that cool. The heads and cylinders were around 130....plenty of air on them. Exhaust pipes-mufflers were 5-600F.
So, my feeling that air cooled engines run hotter and need syn. oil to help in preventing pre-mature breakdowns due to excessive heat just flew out the window......but I'll keep using it anyway in 10-30 viscosity.
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