I have an odd query - I've been interesting in what kind of trumpet (ram pipe) to fit on our carburettored 16v. There is a calculator here: Optimum Intake Runner Predictor Program
that given an intake length will tell me which RPM ranges the harmonic benefits are. I think to make use of it, I need to know how long from the intake valve to the opening of the trumpet.
A quick measurement shows me from the port opening on the head (the face where my carb manifolds bolt up) to the top cover of the carbs is 195mm. That's the height of the manifolds and the carburettors together. I also need to measure the length of the intake tract within the head itself, to the valve face. This would have been much easier to measure before we put everything together...
Does anyone have a standard 16v head off the car and can measure that distance? I'd use a bit of wire in the shape of the tract, I guess. Or maybe someone already knows, roughly.
Also - if anyone has an opinion on the best length of trumpet, especially suppliers of trumpets , that would be much appreciated.
I was looking at something like this: RicambiSport - shop online of sports spare parts for cars
(we run Dellorto DRLA 45s, apparently these will fit fine).