Fast Eddie
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- Joined
- Oct 4, 2013
- Messages
- 20,694
I think you know this already Glen, but according to Jim, bigger valves increase power and torque throughout the range. It’s going too big on the ports, and slowing velocity, that hurts the low / mid range. And that’s on a stock sized Commando.
I honestly don’t think we can question that stock valves are too small for a 920.
But it’s a moot point, trying to get it Comnozed now would be nigh on impossible as you say, and would have a huge impact on project timing etc.
And, doing it this way (the same as I did) will give you the opportunity to decide on a course of action for the head later and do a direct before and after dyno hill test! I don’t have a dyno hill, so had to make do with a dyno, but it was a very informative and fruitful exercise.
I honestly don’t think we can question that stock valves are too small for a 920.
But it’s a moot point, trying to get it Comnozed now would be nigh on impossible as you say, and would have a huge impact on project timing etc.
And, doing it this way (the same as I did) will give you the opportunity to decide on a course of action for the head later and do a direct before and after dyno hill test! I don’t have a dyno hill, so had to make do with a dyno, but it was a very informative and fruitful exercise.