Quote:
Originally Posted by Jason@Nameless
*snip*
arghx7, I like how you think. Optional is the best way to go. Configurability is our middle name. I'm going to keep our software under our hat unfortunately, but it's a readily available header design software. It does NOT take into account cam phasing and variable cam timing, but it does take into account typical 4 valve per cylinder scavenging based on a lot of data we pump into it that we discussed earlier. Also as discussed earlier, changing a few of these variables like camshaft duration still puts us in a round up or round down to the two tubing diameters we are using on these test units, so it's not terribly critical in the overall scheme of things - also, that is why we are testing multiple designs on the dyno. The software is going to get us on the green but the dyno will let us putt to the cup, so to speak.
*snip*
J
|
I'm using an MS Works spreadsheet...
For phasing all that I do is reset the LSA/advance/retard points manually within the range of the AVCS.
Plus I'm trying to focus on the acoustic tuning, and even with accurate phasing to identify the location and duration of overlap, I still don't know the shape/amplitude of wave returns anyways. Nor the effective pressure differential between the cylinder and primary tubes. Nor temperature gradient through the system. So I start with the general estimates for wave and gas speed/temp/pressure then do some low and high estimates through the system.
Like tossing Nerf hand grenades on an accuracy/effectiveness scale, but whatever...