The saw can BREATHE better with the modification.Increase the compressor ratio, which can result in more power and better chainsaw performance.Low operating temperature ensures less wear If you do woods porting and re-tune the carb, you will experience the below things on your chainsaw. Woods porting reduces the back pressure on the muffler. Benefits & Risks: Is it worth porting? Benefits Rejet or swap out the carb with a bigger carb.Open up and/or polish Transfer ports, lighten/polish piston.Turn down the cylinder base and the outside of the piston crown.Open up and/or gut muffler and/or remove CAT muffler and re-tune carb.You can skip or stop at any stage you want. Here, woods porting can be done in different stages. Muffler mods help to move the gasses better for a ported chainsaw. Re-tune the carb muffler mods in woods porting.However, instead of woods porting, you do the below things for increasing power. If you buy an expensive chainsaw for long time use, such as Husqvarna, and are not sure about the risks, you can keep it as it is.įor example, the Stihl 1123 and Stihl 1127 line of saws. Note that every chainsaw is not compatible with woods porting. You cannot apply woods porting to some chainsaw models. You cannot squish the chainsaw, which has a clamshell engine. Some Stihl users make this mistake.ĭoing woods porting incorrectly can sometimes reduce the engine power and even damage it completely. I have seen many ported saws that cannot cut when WOT. Never widen the ports so much that they can clip the rings. It would be far better if they replace the rings. Others thin it and put it in a bud can gasket. Some people pull the jug gasket from the saw to raise the compression. If you mess up the ports, you can damage the mechanical timing. If you are unfamiliar with the process, watch a few videos on YouTube or manage a mechanic for supervision. You have to treat the transfer ports with proper care and respect. Open up the muffler to the original stock design or a bit moreĪpart from these, there are many ways to increase the stock power, such as removing spark arrestors, etc.Light port grinding for better engine breathing.If you feel the above process is risky and don’t want to take many risks, you can do light woods porting. Light woods porting (Less Risky alternative methods) More heat means more wear, damaging the chamber in the long run. It does not reduce the temperature in the running, which is one of the main purposes of woods porting. In this process, the heat cannot be reduced. Your chainsaw will work with more power due to the high compression ratio.īut there is a problem. It results in a combustion ratio boost, making the saw engine more powerful at cutting. Take some sawdust and fill out the combustion chamber. There are some other methods of woods porting that can improve compression and increase engine power. The above three processes are common methods and are considered safe. Polish the piston ports under the skirtsīy doing the above things, your saw engine can get another boost in the compressor ratio.Remove RPM limiter coil or change the coil out to a non-limited type.Remove excess material from the piston and make it lighter.Change the ports’ mechanical timing (by grinding and polishing).Modify the transfer ports of the compressor.Most saw owners finish their woods porting process at this stage, but you can modify a few more things for even better performance. The same type of piston and cylinder is used on both saws.Īfter doing the above two steps, you will experience a better compression ratio from the engine. I used 325 stihl RS chain on Jonsered 490 and 3/8 stihl RS on ported Partner 5000. The piston and cylinder type is the same on both chainsaws. To give you an idea, compare a stock Jonsered 490 and a ported Partner 5000. In short, it increases engine performance. ![]() It impacts response time, torque, and power curves. ![]() Thus it results in more power for the engine. It allows more gas flow which helps to get a higher compression ratio. In wood porting, you need to make a few changes to the chainsaw engine, such as resetting or replacing the carb, changing the cylinder head shape, and tweaking port timing. ![]() In general, wood porting is done on a work saw, or pro saw that runs all day in the forest. It is a less radical version than race porting. The speed will be at the max of factory specs or even higher. The key idea is to make the chainsaw breathe better and smooth out the exhaust system.Īfter woods porting, you will experience a higher WOT( Wide Open Throttle ) RPM. There are many methods to modify the stock chainsaw engine and increase horsepower(HP) and torque. Here comes the need for chainsaw modification. Sometimes, you may need more power than the stock power from your chainsaw. 12 Wrapping up Why Woods Port A Chainsaw?
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