Posted by Randy-IA on August 16, 2008 at 14:50:54 from (207.177.83.65):
In Reply to: Muffler or no muffler? posted by Mark from WI on August 16, 2008 at 09:18:35:
I'm not a tractor engine expert by any means but have run a few high horsepower off road trucks in the past and I ride a modified 84 Harley with straight pipes. I don't think it matters either way for a low rpm, low horsepower engine. The simple explanation is straight pipes are more commonly used on high rpm engines to let one exhaust pulse help pull the next exhaust pulse out of the cylinder at higher rpms. And that requires sizing the pipe for diameter and length to make it work effectively. The M and H Farmall owners manuals suggest using a muffler in "urbanized" areas leading me to believe they were not standard equipment. The straight pipe was just tall enough to get the fumes and noise above the operators head. I would guess the 300 came with a muffler as standard equipment so tuning for the muffler was incorporated into it's design. If you want a pony or two more maybe advance the timing till it pings slightly under load and then back it off a touch. Not sure if this will help on a lo-po engine but it shouldn't hurt the performance either. Getting the fuel to ignite as soon as possible is a good thing within reason. With todays junk fuel though it's a cropshoot. ...Randy
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