![]() 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. At no point do we recommend the Porting-Mod for forced induction or nitrous applications, as the stand removal does lessen the structural strength of the manifold.Įst Gain: We don’t see significantly more peak power over Rod Mod (+1 or 2 HP), but we see it across the entire powerband and the midrange torque increase is worth doing the Porting Mod if you can.12 Wrapping up Why Woods Port A Chainsaw? The Porting-Mod is ideal for naturally aspirated applications and performs at its best in a cammed setup. Again, these bars greatly assist with transitioning air from the plenum into the runners, maintaining maximum airflow and velocity. Once all porting/grinding work is completed, we then install the same carefully selected radius bars that we use in the Rod-Mod. Next, we port the air inlet section of the manifold along with grinding/smoothing the injector bosses protruding into the runners. Once removed, we adequately seal the plenum floor back up, and slightly grind/smooth the floor of the plenum. These stands are large and very obstructive to flowing air. The Rod-Mod is ideal for forced induction applications, as well as nitrous applications as it does not compromise the structural integrity of the manifold during high-pressure events.Įst Gains: 6 HP for bolt-ons & 12 HP for cammed setups.ĭuring the “Ported-Rod-Mod” process, we begin by removing the vertical stands that run inside the manifold plenum. In addition, we minimally grind and smooth the area inside the runners where the injector boss protrudes into the runner, ensuring minimal disturbance to airflow from the injector boss. This helps to maintain proper airflow and velocity. The radius bars we install are carefully selected, measured, and cut to a specific length and assists in transitioning air from the main plenum into the runners. Through research and development, we have learned that air does not like moving over sharp turns – it creates unwanted turbulence. GPI – LS3 Intake Manifold Mod – Best Performing and Value Intake Manifold for your LS3!ĭuring the “Rod-Mod” process, we take the LS3 intake manifold and install radius bars lengthwise in the plenum.
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