Should 20XE owners with the ecotek valve be concerned about this info:
(Q) On my car the vacuum hose connection sits over one or two cylinders will this affect performance?
(A) With multi point injection systems, provided the device accesses the plenum chamber (and not a branch of the manifold) it doesn't matter where it goes.
With carburetor and single point injection systems ideally the device should be located as near the centre of the manifold or the base of the Carburettor as possible please see Cars and Fitting page for further information. This is not always possible, however, and in the same way as when the air intake is at one end of the cylinder bank the air is not all stolen by the first cylinder, the benefits of the CB-26P are not all used by the nearest cylinder. It is however a very simple matter to fit the device and see if the engine runs evenly if it does not you may wish to tap the manifold or return the device under the satisfaction guarantee. On some older 4 cylinder BMWs and Vauxhall Nova's for example the vacuum servo pipe is attached to the neck of just one manifold branch very close to the combustion chamber and the turbulence would certainly not travel back to the manifold, accordingly the device should not be fitted under these circumstances. On certain Vauxhall and VW engines however, the air intake is over cylinder 4 and the servo hose is over cylinder 1 here the device is still accessing the manifold chamber as a whole, rather than the port on one cylinder, and in all such cases the device has been found to work very effectively. If in doubt please contact one of our suppliers
(Q) If the device lets in air surely it will lean the mixture and overheat my valves?
(A) The air taken in by the device accounts for little more than 5% of the total air volume but causes sufficient turbulence to create better combustion and accordingly combustion chamber operating temperatures are quite often reduced.