Englishmaninwales Posted September 26, 2016 Share Posted September 26, 2016 Searched my notes and I am unable to find VHPD inlet and exhaust cam clearances.ThanksMalcolm Link to comment Share on other sites More sharing options...
Area Representative Nick Bassett Posted September 26, 2016 Area Representative Share Posted September 26, 2016 I think DVA talks about 2.5mm on his K series web site...a call to him would confirm...http://kengine.dvapower.com/ Link to comment Share on other sites More sharing options...
7 wonders of the world Posted September 26, 2016 Share Posted September 26, 2016 Think you might mean 0.25mm Link to comment Share on other sites More sharing options...
Area Representative Nick Bassett Posted September 26, 2016 Area Representative Share Posted September 26, 2016 I guess it depends on exactly what Malcolm (OP) is asking for, but taken from DVA website:Piston/Valve clearancesWhen contemplating a change of cams it is important to ensure that there is sufficient working clearance between the valves and the tops of the pistons on the 1.4 and 1.6 engines there is likely to be more of a problem than on the 1.8 where the piston is 1.4mm further down the bore. We have undertaken a clearance checking exercise on a 1.6K engine using the Piper #740, #835 and VHPD grinds, this exercise shows about 3mm clearance between the piston and the valve head for the #740 and 2.5mm for the #835 and VHPD, and a 2.0mm lateral clearance with 30mm inlet valves so these two cams should be safe to use without piston mods even with VVC sized valves. I cannot absolutely guarantee this clearance since it will vary with several factors, valve size, cam timing, amount skimmed from head and how much the valves are recessed into the seats, but in general these should be OK. Cams with 300 degrees or greater duration will need checking. It is not easy to enlarge the cut-outs in the pistons since they already come perilously close the the ring lands, any serious removal of metal would likely result in finding fresh air via the top ring. Link to comment Share on other sites More sharing options...
revilla Posted September 26, 2016 Share Posted September 26, 2016 Those figures are valve to piston clearances. The OP was asking for cam clearances, by which I guess he was talking about shimming solid lifters? Link to comment Share on other sites More sharing options...
Area Representative Nick Bassett Posted September 26, 2016 Area Representative Share Posted September 26, 2016 Ah I see - sorry Malcom! Link to comment Share on other sites More sharing options...
Englishmaninwales Posted September 26, 2016 Author Share Posted September 26, 2016 Ah! Yes, I'm sorry Nick, I should have been a bit clearer in my post - I'm after cam - cam follower clearances! (Piston to valve calculations are out of my league!)Malcolm Link to comment Share on other sites More sharing options...
oilyhands Posted September 26, 2016 Share Posted September 26, 2016 8 thou(0.20mm) inlet, 10 thou(0.25mm) exhaust.Oily Link to comment Share on other sites More sharing options...
Englishmaninwales Posted September 26, 2016 Author Share Posted September 26, 2016 Thanks Dave. Link to comment Share on other sites More sharing options...
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