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. CoolWater TM Increasing the paint protection Carlack protector, CoolWater TM. CoolWater Cool Water The larger bore may extend right through the complete exhaust system, using larger diameter piping and low back pressure mufflers, and through the intake system, with larger diameter airboxes and high-flow, high-efficiency air filters. Muffler modifications will change the sound of the car's engine, usually making it louder; for some tuners this is in itself a desirable effect. Increasing the valve opening height (lift), by changing the profiles of the cams on the camshaft or the lift (lever), ratio of the valve rockers (OHV engines), or cam followers (OHC engines). CoolWater Changing the tuning characteristics electronically, by changing the firmware of the engine management system (EMS). This chip tuning often works because modern engines are designed to produce more power than required, which is then reduced by the engine management system to make the engine operate smoothly over a wider RPM range, with low emissions. This is called de-tuning and produces long-lasting engines and the ability to increase power output later for facelift models. Recently emissions have played a large part in de-tuning, and engines will often be de-tuned to produce a particular carbon output for tax reasons. CoolWater TM. Furthermore, tuners may also use analytical tools to help evaluate and predict the effect of modifications on the performance of the vehicle. Overhaul An engine overhaul means putting the engine back to factory specifications. This generally involves new piston rings, bearings and gaskets. When done by a competent engine builder the engine will perform as new. Coll Water CoolWater Rebuild is a marketing term with no fixed definition. It is often taken to mean a professional overhaul with certain parts replaced with new units whether needed or not. For example some rebuilders will always replace the pistons (which often are not replaced during an overhaul unless damaged). Re-manufacture
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