Quote:
Originally Posted by Baltothewolf
The only unknown variable here is the VE of the ECA1 engine. I can't find it anywhere, but I can imagine Honda has it close to 80-85%. Problem is, if I'm off by even 5% it can make a huge difference in how much boost the engine will get.
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That's the best you can do. I believe 80-90% to be a reasonable range for that Honda engine. The tricky part is that when you have cam overlap, the blower might be blowing air straight out the exhaust port.
Honestly, the way you have to look at a Roots supercharger setup is how much CFM you want to push through (taking into account how much boost it will generate) and thus specific torque/specific power. You cannot really be sure how much power the supercharger will consume because it is way too dependent on temperature and VE. I'd shoot for something safe like "supercharger will displace 1.4L per 2 revolutions", pick a blower based on that goal, and then work with it once you get the blower. There is not much of a choice in blowers anyhow.