Variable Compression, Variable Displacement you deside

[Pete Datcuk]

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  This statement would have to assume that the temperarture didn't =
increase with the increased pressure.  It would also assume that =
doubling pressure would double flow, but the increase in frictional =
forces on the moving air might prevent this from happening.

Pete Datcuk
Mechanical Engineer
'87 Fiero, soon to be Northstar'ed :-)
'67 Jeep Commando, to be risen from the dead ;-)


-----Original Message-----
From:	James Weiler=20
Sent:	Tuesday, February 17, 1998 2:53 PM
To:	diy_efi at efi332.eng.ohio-state.edu
Cc:	diy_efi at efi332.eng.ohio-state.edu
Subject:	Re: Variable Compression, Variable Displacement you deside

Uhmmm. Bruce. At 1 bar of boost (that's 15 psi of presure right?) you=20
would double the volumetric efficiency of an engine.  Think about it. =20
Right now we are experiencing 1 atmosphere of presure (absolute) so if =
our=20
engine has a VE of 80% (for example) then when we add 1 atmosphere (bar) =
of=20
boost we will be putting twice as much air in as compared to the NA =
situation.=20

So our VE goes from 80% to 160%.  In the book 'maximum boost' by Corky =
Bell=20
he gives a rule of thumb:  Every 5 psi of boost results in an increase =
in=20
the VE by 33% so a 15 psi turbo will double the VE of any engine.

Ok flame on
jw

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