Proposing to fit L1 Cams into Big Valve
Posted: Thu Jun 25, 2020 5:39 am
Hi;
I'm proposing the fit higher lift L1profile cams into my Elan Sprint. What I need to know Is what the existing clearance is between the Inlet Valve and Piston when at TDC.
The required clearance for the L1 camshaft is 5mm from top of piston, Could anybody please tell me that the distance is greater than 5mm. This would then mean that L1 cams can be installed without further machining being required to the top of the pistons.
The Specification has been copied from Burton Performance website and is posted below:-
Very popular rally/race camshaft. Best power band between 4500-7500rpm. To check for piston to valve contact, ensure there is a minimum clearance of .200” (5mm) between the valve head and piston at TDC.
Power Band: 3500-7500rpm
Valve Lift: 0.398"
Duration: 306° inlet
Timing Figures: 47/79/71/55
Inlet/Exhaust Full Lift Position: 106° ATDC
Inlet Valve Lift at TDC: 0.130"
Exhaust Valve Lift at TDC: 0.127"
Valve Clearances: .010" inlet/.010" exhaust
Durations quoted at .010” / .25mm checking height.
Thanks in Advance
fastcat7
I'm proposing the fit higher lift L1profile cams into my Elan Sprint. What I need to know Is what the existing clearance is between the Inlet Valve and Piston when at TDC.
The required clearance for the L1 camshaft is 5mm from top of piston, Could anybody please tell me that the distance is greater than 5mm. This would then mean that L1 cams can be installed without further machining being required to the top of the pistons.
The Specification has been copied from Burton Performance website and is posted below:-
Very popular rally/race camshaft. Best power band between 4500-7500rpm. To check for piston to valve contact, ensure there is a minimum clearance of .200” (5mm) between the valve head and piston at TDC.
Power Band: 3500-7500rpm
Valve Lift: 0.398"
Duration: 306° inlet
Timing Figures: 47/79/71/55
Inlet/Exhaust Full Lift Position: 106° ATDC
Inlet Valve Lift at TDC: 0.130"
Exhaust Valve Lift at TDC: 0.127"
Valve Clearances: .010" inlet/.010" exhaust
Durations quoted at .010” / .25mm checking height.
Thanks in Advance
fastcat7