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Renault 5 GT Turbo / Piper Cams / valve clearance
« on: 22:04, Mon 28 November 2011 »
Hi ,
I have just fitted a Piper Cams to KTR spec ( it is the modified 260°) . The engine is running fine , no problem .
Today I wanted to double check the valve clearance and realised that the valve clearance given by Piper was the following : 0.37 for the inlet and 0.42 for the exhaust . I just thought WOA that's huge . I took the ETAI document and realised the Renault one for a standard camshaft was 0.20 for the inlet and 0.25 for the exhaust .
The Piper valve clearance to respect is about twice more than the Renault one .
So my question is why ? what clearance do you have/adjust when running with this particular camshaft ?
What is the valve clearance to have when running with a Piper 270 or 285 ... is it even more than these ones ?
The first idea I had was probably to avoid a contact between the pistons and valves at high RPM since the springs to use are the standard ones .
Cheers .
I have just fitted a Piper Cams to KTR spec ( it is the modified 260°) . The engine is running fine , no problem .
Today I wanted to double check the valve clearance and realised that the valve clearance given by Piper was the following : 0.37 for the inlet and 0.42 for the exhaust . I just thought WOA that's huge . I took the ETAI document and realised the Renault one for a standard camshaft was 0.20 for the inlet and 0.25 for the exhaust .
The Piper valve clearance to respect is about twice more than the Renault one .
So my question is why ? what clearance do you have/adjust when running with this particular camshaft ?
What is the valve clearance to have when running with a Piper 270 or 285 ... is it even more than these ones ?
The first idea I had was probably to avoid a contact between the pistons and valves at high RPM since the springs to use are the standard ones .
Cheers .