After beating on our koso 170 4 valve that we built a couple years ago, we decided to bump it up a notch to make more power but also make it as reliable as possible. In order to do that we had to go with a 63mm piston (forged of course) and a tad bit less compression to reduce the risk of detonation when running on pump gas. We also added many performance and longevity features on to the piston it self, here is just a few below
- Frictionless Coating
- Each piston comes with a specialized coating on the skirt edges that reduces piston slap and is made to be frictionless. This allows the piston to move even more freely in the cylinder. This coating reduces scuffing and provides back-up lubrication and works well with engines with longer rods and Nickasil cylinders.
- Strutted Piston Skirt
- The piston skirt utilizes a strutted design over a full round design. Having a strutted design not only reduces the weight but provides key points that can be machined to increase overall piston strength where the rods connect. This characteristic shaves off undesired weight and can be designed to help keep piston structure sturdy. This also helps with less friction due to reduced amounts of material against the sidewall of the cylinder.
- V-Shaped Accumulator Groove
- The V-Shaped groove that sits between the first and second ring was machined with an intentional purpose of relieving the top ring by adding volume between them. What it does is accumulates residual gasses from the combustion chamber. This will help prevent premature wear on the rings and provides an overall improved ring seal
for more info and pricing click on the link below