Combustion Chamber Modifications
Although recently new technology, combustion chamber modifications not only provide the allowance of reducing compression but give us the availability to reshape the combustion chamber bathtub and make all the combustion chambers identical and equal in size. By doing so you end up with a perfectly symmetrical rotor and exact and matching engine displacement on all combustion faces. This not only provides for uniform and even combustion pulses, but an equally even and cleaner burn which can be better for more accurate tuning. Although this CNC process can be performed on just about any rotor, best results are noticed on pre-89 rotors which have more material from the factory. A substantial weight reduction is also gained and rebalancing the rotor is strongly recommended. The most common application are engines fitted with 87 to 88 turbo rotors which are built for high power and high boost pressures. In theory this increases the displacement of the engine and reduces the chance of detonation. When lightened, this generation of turbo rotor is an excellent choice as a direct replacement for the more fragile 93 up and 20B rotors. The 87-88 turbo rotor is much more robust and durable due to its overall mass. Again, once lightened, this rotor will weigh about the same or slightly less than a factory 93 up or 20B rotor.
Cost per rotor: $220.00
*click images to enlarge
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*After images also have Rotor Clearancing and Rotor Lightening modifications in addition to the combustion chamber modifications.