Earlier (P10-P11) Primera engines were different to SR20
as the SR20 cylinder head was only used on the GT model.
The Belgian_Roadster wrote:
> For the SR20 swappers.
> I read about the new SR20 engine having a new valve mecanisme.
> I only know B13/N15 and B14/N15 SR20 engines.
> New Nissan Primera P12(for Europe only) already use the QR20, which
> has variable valve timing.
> Pivot arms have been removed also. Now the cam is acting directly on
> the hyd. valve lifter.
> So what's new on the US SR20 valve mec. They call it roller cams,
> what's it about?
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