Engman

sketch for above

Sorry cant find the numbers on the material to remove on the six port.

I lost them.

Cool info, as that tells me how much I can safely remove to lighten rotors. Thanks for sharing it. I will have to file that away for future reference.



Didn't however answer my original question, and I now realise that I didn't word it very well.



So lets try again.....



The ports are opened and closed by the outer edge of the rotor. But if you look closely, its effectively the side sealthat really closes off the port as there is a tiny gap between the side of the rotor and the side housing (and if that gap reaches zero bad things happen).



So in 'theory' if you remove metal from the rotor above the side seals you can improve the flow in that first/ last 10-20 degrees of the inlet cycle which will effectively extend the duration without having to go as far as a bridge port.



Bill

I cant answer that. However it seems plausible and Judge Ito , if I recall right has seen or knows where the rotor edge was chamfered for the effect your looking for.

You want to PM him.

Can someone chime in and explain this in laymans terms?

I've been thinking about this for a while (re: the angling of the rotors edge) all im concerned about is balance of the rotor afterwards?

Would it be a non issue because you'd be taking the same ammount off each 'side' of the rotor?

The rotor will need to be balanced after the machinework. The better the machineworkk, the less balancing will be required.

Stan at SDJ MOTORSPORTS modifies timing by machining the rotors.

werd! cool info, but would it really have a significant difference?