Skip to main content

MadaboutKitcars

This is a read-only archive of the old Madabout Kitcars forum. New posts and replies are no longer possible, but every thread is still here to browse and read.

M20 max bhp at rpm

Patrick 7 Jan 2007, 3:46pm
Based on the info in this page: http://users.belgacom.net/bmw_z3/bmw_z1.htm

Power, 170 bhp @ 5800 rpm. Torque, 158 lb-ft @ 4300 rpm

Which by my calculation makes tested RPM for SVA on the M20 3867rpm

Can anyone confirm those numbers?
peterux 8 Jan 2007, 10:22pm
My Haynes manual says 171bhp at 5800, so I reckon 3/4 max power speed is 4350rpm.

SVA manual states Noise test should be done at a constant speed of 3/4 of the engines maximum power speed and 500mm from the exhaust outlet.

Hope that helps...

Peter
Patrick 8 Jan 2007, 10:32pm
Thanks Peter, I forgot it was 3/4 not 2/3's I think its 2/3's RPM if you don't state max power :)

I'll take some more readings at 4350rpm at the weekend and see what the meter says! :)
peterux 8 Jan 2007, 10:44pm
Yup, 2/3rds of the max design speed, if you don't state the max power speed.

Peter