Hi
I just got a spare head for my nord 1750 and I am curious about the effect of porting. I have both of Jim K's books for the Alfa and I was super tempted to do everything accordingly.
However, this thread is not to call into questioin Jim's work as I think he did a wonderful job, just wondering if there are more than one way to Rome, so to speak, besides enlarging the ports.
Jim's work and the increase in power speaks for themselves.
Just wondering about something that I read about (autodelta??) narrowing the port dimension to speed up the charge. Why so? Seems kind of counter intuitive and yet makes sense at the same time. It seems to me that they are trying to rely on the venturi effect to speed up the charge. (I am hardly an engineer so I cannot comment other than to read with a little common sense)
Anyone with experience narrowing ports or following this process? Sorry my memory about whether it was Autodelta that did this or the Competition manual etc I cannot remember.Just that I remembered reading somewhere about narrowing of the ports from the earlier to the later version. Comments will be most appreciated.
Again, I think there are probably more than 1 way to Rome and out of curiosity I would like to learn a little more about alternative ways of doing things apart from what is there since Autodelta apparently tried the same. Just exploring before I make the jump!
The advantage of taking Jim's route is that he has done everything so I only have to follow the text book. whereas anyother way I will have to figure some bits of it out. Anyway that is the fun bit about tinkering
Thanks
fgc
I just got a spare head for my nord 1750 and I am curious about the effect of porting. I have both of Jim K's books for the Alfa and I was super tempted to do everything accordingly.
However, this thread is not to call into questioin Jim's work as I think he did a wonderful job, just wondering if there are more than one way to Rome, so to speak, besides enlarging the ports.
Jim's work and the increase in power speaks for themselves.
Anyone with experience narrowing ports or following this process? Sorry my memory about whether it was Autodelta that did this or the Competition manual etc I cannot remember.Just that I remembered reading somewhere about narrowing of the ports from the earlier to the later version. Comments will be most appreciated.
Again, I think there are probably more than 1 way to Rome and out of curiosity I would like to learn a little more about alternative ways of doing things apart from what is there since Autodelta apparently tried the same. Just exploring before I make the jump!
The advantage of taking Jim's route is that he has done everything so I only have to follow the text book. whereas anyother way I will have to figure some bits of it out. Anyway that is the fun bit about tinkering
Thanks
fgc