[Diy_efi] New BMW 760, fuel pressure, direct inject

[Bernd Felsche]

On Tue, Jan 07, 2003 at 10:23:24AM -0800, Perry Harrington wrote:

> I'd assume that Audi put the injector in place of the middle
> intake valve on the R8 motors, since they are 4 valve motors and

Not just the R8, but also their new 2-litre 4-cylinder engine.
I seem to recall that the remaining inlet valves have been re-sized.

> not 5.  Seems logical for BMW to do the same.  Considering

BMW don't have 5-valve heads. :-)

> pressure, DI gas engines don't have the same static CR as diesel
> engines, therefore the required pressure is lower.  If your static
> CR is ~180-200psi (the M3 motor is 180), then the compensation to
> overcome that is 180psi, although that 12Mpa sounds interesting.

Audi said they were running 100 Bar on the R8. That's 10 MPa in
round figures. :-)

-- 
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