M90 Flow numbers

[Inline6Merc]

Does anyone now the Island Flow for a M90 and its peak efficiency? I would assume 90 cfm at 55%.

thanks,

Curtis

 

[XPC66]

http://www.eaton.com/EatonCom/ProductsS ... d=EatonCom

 

[rickwrench]

I've heard M90s are about 65% efficient. Moving about 400cfm on an engine at the blower's rpm limit of 12,000rpm.

The "90" in M90 is for the CID displacement of one (stock sized) blower pulley revolution.

So, 90 cubic inches x 12,000 rpm (6000 rpm engine speed x 2) = 1,080,000.
1,080,000 / 1728 (cubic inches in one cubic foot) = 625 cubic feet.
65% of 625 cubic feet is 406.25 cubic feet.

Close enough to 400cfm, I guess.
Rick(wrench)

 

[Inline6Merc]

thanks guys.

 

[Hodgie1013]

http://www.rbracing-rsr.com/turbotech.html#eaton

Here is a site with maps and graphs for a bunch of common turbo and superchargers.

Another thing, Not to hijack the post, but I am trying to figure out how to determine how many RPM a supercharger pulley turns given the size and RPM of my crank pulley. Basically so I can calculate my custom pulley size. There are equations to find this out but I can't find any. Thanks.

 

[StrangeRanger]

Blower RPM = Engine RPM x Engine Pulley diameter / Blower pulley diameter

 

[Hodgie1013]

Blower RPM = Engine RPM x Engine Pulley diameter / Blower pulley diameter

Awesome, thanks a bunch!