Joined Nov 2001
17K Posts | 773+
Ely, England
well i've stuck this into two threads and it really is hard just to get a reaction from you lot. not even some of the time, sheeesh, all the time mereckons!!!!
ok, most are running - we'll call them - 'grape shape cams by now. the cam flanks are softer and the cam follower bearings seem to be coping better.
the cams have broader timing and we have almost too much overlap - certainly enough to play with!
then we have the fact that all the exhaust valves i ever see are covered in carbon and don't appear to be seating correctly?
so what about a wider exhaust clearance? if the thread is 0.7mm and we take a 1/6th we get 0.12mm which is correct. that's .005" in old money! there are 28 thou to a turn. what do we try for?
.007" is a 1/4 turn. what would the valves look like then?
i don't think we would damage the valve gear at all doing this and idle would be better due to less reversion and overlap.
what would it run like then? a definate and worthwhile try with dual spring kits, what about conicals?????
regards
Taffy
ok, most are running - we'll call them - 'grape shape cams by now. the cam flanks are softer and the cam follower bearings seem to be coping better.
the cams have broader timing and we have almost too much overlap - certainly enough to play with!
then we have the fact that all the exhaust valves i ever see are covered in carbon and don't appear to be seating correctly?
so what about a wider exhaust clearance? if the thread is 0.7mm and we take a 1/6th we get 0.12mm which is correct. that's .005" in old money! there are 28 thou to a turn. what do we try for?
.007" is a 1/4 turn. what would the valves look like then?
i don't think we would damage the valve gear at all doing this and idle would be better due to less reversion and overlap.
what would it run like then? a definate and worthwhile try with dual spring kits, what about conicals?????
regards
Taffy
