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Currently under lab tests. The second prototype.
A head from Honda VTEC B16A has been modified.
The modification includes the substitution of the original rocker arms with light alloy ones. The new rocker arms have roller instead of slider type cam followers (like the S2000 and the Civic typeR, about which Honda claims a 70% reduction of the friction at the valve train system). The cam lobe acts on the roller of the rocker arm through a free roller whose pin rolls on a proper cylindrical surface of the relevant control shaft.
Two control shafts (one for exhaust and one for intake) have been made, 1 Kg each. They have been mounted bellow the existing camshafts, on bearings cut on the original aluminum of the cylinder head.
The soft / side cam lobes of the camshafts have been removed. The original wild cam lobes act on the new rocker arms.
The position of the camshafts does remain as it is, the engine cover and dimensions also remain as they are.
The original string from the accelerator pedal will act on the two control shafts instead of the throttle valve (which is removed).
The PGM-FI unit will be reprogrammed to fit to the VVAr engine.
The weight of the original rocker arm (shown in the middle of the four new VVAr light alloy rocker arms) is more than 0.260 Kg, while the weight of each complete light alloy VVAr rocker arm (including its roller as well as its relevant free roller) is less than 0.135 Kg, making possible the reliable operation of the valve train system at 10.000 rpm even with the original valve springs and valve retainers.
The original rocker arms offer just two modes of operation, while with the new rocker arms there are infinite modes of operation starting from zero lift. The actual overlap (time-valve area) at partial loads and medium to low revs is dramatically reduced, making the use of VVT system unnecessary, even if at high revs with full load the overlap is chosen to be extreme.
e-mail: vva@pattakon.com
PATTAKON
Greece
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