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Why a secondary timing belt tensioner?

BELT Secondary tensioner timing
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Why a secondary timing belt tensioner?

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1) Have you ever seen a car on the dyno with the timing belt exposed? The long side of the belt at the front (between the EXHAUST cam and Crank Pulley) has a travel distance of aprox 12″ with no tensioner. The belt flaps over 1″ while under load at high RPM. Why is this a problem? Your cam timing is very important at high RPM and this flapping creates a variation between the crank and cams. However small you may think it is, remember how fast the motor spins and how many revolutions per minute were talking about. The difference will throw your cam timing and spark out enough to cause a timing difference. The pulley keeps the long side of the belt tight which keeps your timing in check. Many pro racers have been building and using these for years on their own cars with self machined parts and OEM pulleys. Finally a commercially available product for your street/strip car is available. 2)As you run a really high lift cam you run heavy valve springs to eliminate valve float. Much heavier

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