Hi all,
My understanding is that with a supercharger, lift is good, but valve overlap is bad- as it allows the induction charge to escape down the exhaust (unlike a turbo which retains a significant amount of back pressure in the exhaust).
Here is a list of Hillman Imp camshafts:
imps4ever.info/tech/camshaft.html
The most suitable and freely available is the sport (.310" lift).
However, I'm thinking... is it a viable solution to have something like the R17 (.360" lift) reground to shave off some overlap? Obviously it may result in the need for thicker shims, but as they are solid this should not be a huge issue. And of course, it would be necessary to decided where the lobe should be shaved and hence specify exhaust and inlet durations.
Would it be easier with a "wilder" cam, with a longer duration- i.e. more material could be taken off without reducing the base radius of the camshaft?
Just wondered if you guys think it is a viable solution. I appreciate that it is quite difficult without seeing the actual camshaft and the shape of the lobe.
My understanding is that with a supercharger, lift is good, but valve overlap is bad- as it allows the induction charge to escape down the exhaust (unlike a turbo which retains a significant amount of back pressure in the exhaust).
Here is a list of Hillman Imp camshafts:
imps4ever.info/tech/camshaft.html
The most suitable and freely available is the sport (.310" lift).
However, I'm thinking... is it a viable solution to have something like the R17 (.360" lift) reground to shave off some overlap? Obviously it may result in the need for thicker shims, but as they are solid this should not be a huge issue. And of course, it would be necessary to decided where the lobe should be shaved and hence specify exhaust and inlet durations.
Would it be easier with a "wilder" cam, with a longer duration- i.e. more material could be taken off without reducing the base radius of the camshaft?
Just wondered if you guys think it is a viable solution. I appreciate that it is quite difficult without seeing the actual camshaft and the shape of the lobe.
