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Old 01-12-2013, 12:00 PM   #6
nando's Avatar
Join Date: Nov 2003
Location: bellingham, wa
Posts: 33,308
Originally Posted by downforce22 View Post

Volumetric Flow rates for some BMW V12 Engines. Interesting read, considered looking at the M70 engine specifically as it is basically two M20B25s siamesed together. It has very good info on some turbo charged V12s.
just wanted to respond to this..

it's really not at all the same. the M70 has completely different cams, intake, exhaust, and heads. I'd put money on the M20 being more efficient. the M70 is meant to have a lot of low end, lazy grunt. it's a cruising motor meant to be quiet and refined, but have lots of torque everywhere.

the only thing the M20 and M70 really share are the 91mm bore spacing, 75mm stroke and 84mm bore. but most BMW engines share some of these characteristics..
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