If we let it get too close, we can actually get contact due to things like thermal expansion and piston rock. So what does it meant to optimize the squish band? It generally means that you adjust the height of the cylinder head, relative to the piston, such that the piston comes as close to the head as weĭare let it get. So you see, there is substantial room for improvement. Ideally you'd like it more on the order of. Your squish band clearance, without your attention, will probably be in the. Those are all good things! They result in more complete combustion (read: more power and better fuel mileage) as well as better resistance to detonation. The result is more chamber turbulence, better atomization of the fuel, and the squish band even has a cooling effect on the fuel. Think in terms of stepping on a tube of toothpaste. The piston sandwiches the air/fuel up next to the head, causing it to "squish", and shoot Though the fire has already been lit, these areas still contain unburned air/fuel mix as the piston arrives. So what is squish clearance? Also known as "quench", squish refers to the area or areas where the piston comes very close to the cylinder head while passing through top dead center (TDC). Squish clearance is one of those things, in fact it's one of your best opportunities. yours) isn't optimized.īut when you put it together yourself, you can take some extra time and effort and optimize certain things. Unfortunately, that means the typical motor (i.e. Every part has a tolerance, and the tolerances are specified such that if every part was off in the worst case direction, the motor still goes Slow production and add cost to the product. The parts are all designed to go together and work without needing any custom rework that would You see, your motor, like the rest of your bike, was made in a factory, on a production line. In all likelihood, the combustion chamber in your Harley can be fine-tuned, during assembly, to give you all these things, and the only thing it'll cost How would you like a little free power, better mileage, and more resistance to detonation all rolled into one? Yes? What is a Squish Clearance and Why Do I Care? Types of squish bands found on HD engines What is a squish clearance and why do I care?
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