Rick360 wrote: ↑Sun Mar 24, 2019 8:33 am
GARY C wrote: ↑Sun Mar 24, 2019 3:30 am
Some think throat size is critical and others think it doesn't matter... If it does then what should it be for this test and was it?
Some think chamber shape matters and others don't... If it does then what should be addressed here?
Conflicting info posted in regards to valve size and cams tested doesn't help... Should it be how many cams were tested or what cams were tested?
How does port shape differ from one to another if any?
Is any test considered valid or should it have a repeatable parameter like is done in science?
None of our tests are scientific. Way too many parameters to isolate. Some single changes might never show a gain without also making a complimentary change. That branches out into more tests than a person has time for in their lifetime really quick. We don't have any control of inlet air conditions and only limited control of engine temps. We have to rely on correction factors to compare. You have to do the best with what you have to work with. Understanding the inaccuracies is part of forming an opinion of what is "better" when doing dyno testing. Make informed opinions about better or worse and incorporate those into your engines and they should improve.
There is no "perfect testing" in engine building. The final results is the only thing that matters.
Gary, it's obvious that our testing isn't up to your standards. You should do your own tests so you can do it right. Let us know when you get that done.
Rick
I am not knocking your testing I am asking what effects what, if any one of these things has an effect on the other then it seems you would have to have at least 2 sets of heads done specifically for each and probably 3 cams per set, but what cams.
It seems engine builders have differing opinions as to valve to bore ratio and how important throat size is or isn't.
What rpm parameters would it need to be at?
Way to much time and money to be chasing a few hp and would probably just introduce more what if's.
So far I have found I can improve every part of the lift curve except for the one I am targeting so I will be happy just to figure that out but without before and after testing I may be chasing something that doesn't even matter.