206er wrote:josh, can you explain how squish and quench area effect detonation?
My take is as follows, this is the information I have based my most recent motor build on:
The quench area (built into the pistons and head), or the flat areas at either the exhaust or intake sides of the piston, just in front of the valve relief’s. This shaping and the squish or the distance between the piston and head, moves the gases within the cylinder to their "desired" area.
There are some folks that have had great results making the quench area far larger on the intake side, thus moving the gasses and the following combustion to the exhaust side. This as well as a slight offset in the wrist pin can move the forces of combustion to the side it will "do the most work".
The squish or distance to the head will be the deciding factor on how effective the quench areas are. As if the distance is too far they will not properly move the gasses.
In the distant future, I would love to build a motor I can afford to push until it pops seeing how this theory works for me, in real life.
More to the original topic, and a heavy dose of reality as opposed to theory Eric's (frantic Four)2.2t with thin gaskets DOHC heads and a VF39 was awesome. He was really worried about the squish area being too tight however, it is still running strong! This motor, as I said before seemed really resistant to detonation. He was even boosting around towing a trailer and motocross bikes!
