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| | Bill Sherwood's VVT Vs VTEC Page |
 | | The early VVT system was relatively simple, ie, at a specific rpm (~4400rpm on the 20 valve 4AGE's) the computer signals the OCV to open, this lets oil pressure go through a special gallery in the #1 inlet cam bearing, through the centre of the inlet cam to the VVT pulley. |
 | | There's a small piston in the VVT pulley, and once it gets enough pressure behind it, it starts to move outwards, causing the outer part of the pulley to turn in relation to the inner part, due to the helical spline that guides the piston's fore and aft movement. |
 | | VVT will operate in any rpm between the range of 1500 and 7200 when the inlet manifold pressure is right. |
| www.billzilla.org /vvtvtec.htm (2182 words) |
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