Benno Posted November 2, 2016 Share Posted November 2, 2016 I want to check my tappet clearances, but am not sure exactly what I should be setting them too. I have a Ford 1600 crossflow motor with an unknown cam in there. The car has a fairly lumpy idle, but I don't have a clue what the cam is. Not overly keen on taking too much apart to figure out what the cam is if I can avoid it. The haynes manual says to set the clearances to intake: 0.25 mm, exhaust: 0.55 mm. Kent Cams specifies 0.36 mm Inlet/ 0.46mm Exhaust for a BCF2 cam. Suggestions what I should be setting them to?? What is worse, too tight or too loose? Quote Link to comment Share on other sites More sharing options...
BobbyBreeze Posted November 2, 2016 Share Posted November 2, 2016 I'd start off with something like 0.36mm/0.46mm (14/18 thou) and see how it goes. If its too noisy you can close em up a bit but I wouldn't go under 0.25mm / 10thou. Both too tight and too loose can be bad - too tight and you risk not fully closing an exhaust valve due to thermal expansion, too loose and you will pound your valvetrain to bits as the seating/take up velocity increases fast once you are off the lash ramp of the cam. Also generally the engine will run a bit more crisp with tighter clearances as the seat to seat duration is less. 4 Quote Link to comment Share on other sites More sharing options...
Benno Posted November 3, 2016 Author Share Posted November 3, 2016 Ideal, cheers. Quote Link to comment Share on other sites More sharing options...
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