Know your valve lift

Wednesday, Jan 28, 2015

A properly rebuilt cylinder head can only be achieved with the right tools and the experience of knowing how to use them. Valve guide interference fit, Valve stem to guide clearance, seat width, installed height, and coil bind are all important things to know and document.

When installing valve springs on a Triumph head it is imperative that you know your valve lift, which can be calculated by multiplying your camshaft lift by 1.11. The springs must then be checked on a valve spring tester to know your spring pressure both at the seat and at full lift. Triumph heads are notorious for having low spring pressure which in turn will destroy your camshafts, tappets, or both.


If you are building a head, or having one rebuilt, please make sure you are aware of your valve lift to save costly damage to your engine.

Kibblewhite, news, racing, reference

Harman & Collins Motorcycle cams book!

Friday, Apr 11, 2014

Anyone who is into Triumph motorcycles knows how legendary Harman and Collins Cams were in the 50′s and 60′s. This technical publication was originally published in 1968, and has now been reprinted in its entirety with full rights from the author. Whether you are a veteran racer or a youthful enthusiast, there is much to be learned from the vast experience of this renowned camshaft manufacturer.┬áTo order click here


pre unit, racing, reference

New Tech articles

Sunday, Jan 22, 2012

Check out the tech section for useful information…