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----- Original Message -----=20
> Are you sure that isn't vacuum retard?
Yea, I wrestled with that for ages when restoring my car. The early =
Biturbo turbos blow through the carburetor, which is enclosed in the =
plenum. When boost comes up, vacuum advance fails so the other capsule =
takes over. Its a nasty, complex system with flow restrictors in various =
vacum/pressure lines to retard reaction time. It almost destroyed my =
love of dynamic systems! :-P
Ah of course - boost kills 'vacuum' advance, so 'pressure' advance =
takes over.
... When preignition or pinking occurs, the computer modulates the =
waste gates to reduce the boost.
For a long time I messed around trying to get a 'knock-sensing retard' =
system onto the MGB, but the engine is so noisy the knock sensor was =
triggering all the time! Early BL computer controlled systems used that =
instead of (or maybe as well as) fixed maps, suddenly tread on the =
throttle to pull away and you could hear it pink like billy-oh, then =
rapidly reduce as the system retarded. Had it worked it would have =
largely taken the place of centrifugal and vacuum advance, but never =
mind.
Paul.
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<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black">> Are=20
you sure that isn't vacuum retard?</DIV>
<DIV dir=3Dauto>
<DIV dir=3Dauto class=3Dgmail_quote>
<DIV dir=3Dltr class=3Dgmail_attr>
<DIV dir=3Dauto><FONT size=3D2></FONT><BR></DIV>
<DIV dir=3Dauto> Yea, I wrestled with that for ages when =
restoring my car.=20
The early Biturbo turbos blow through the carburetor, which is =
enclosed in the=20
plenum. When boost comes up, vacuum advance fails so the other capsule =
takes=20
over. Its a nasty, complex system with flow restrictors in various=20
vacum/pressure lines to retard reaction time. It almost destroyed my =
love of=20
dynamic systems! :-P</DIV><FONT size=3D2></FONT></DIV>
<DIV dir=3Dltr class=3Dgmail_attr><FONT size=3D2></FONT> </DIV>
<DIV dir=3Dltr class=3Dgmail_attr><FONT size=3D2>Ah of course - boost =
kills 'vacuum'=20
advance, so 'pressure' advance takes over.</FONT></DIV>
<DIV dir=3Dltr class=3Dgmail_attr><FONT size=3D2></FONT> </DIV>
<DIV dir=3Dltr class=3Dgmail_attr>... When preignition or pinking =
occurs, the=20
computer modulates the waste gates to reduce the boost.</DIV>
<DIV dir=3Dltr class=3Dgmail_attr><FONT size=3D2></FONT> </DIV>
<DIV dir=3Dltr class=3Dgmail_attr><FONT size=3D2>For a long time I =
messed around=20
trying to get a 'knock-sensing retard' system onto the MGB, but the =
engine is=20
so noisy the knock sensor was triggering all the time! Early BL =
computer=20
controlled systems used that instead of (or maybe as well as) fixed =
maps,=20
suddenly tread on the throttle to pull away and you could hear it pink =
like=20
billy-oh, then rapidly reduce as the system retarded. Had it =
worked it=20
would have largely taken the place of centrifugal and vacuum advance, =
but=20
never mind.</FONT></DIV>
<DIV dir=3Dltr class=3Dgmail_attr><FONT size=3D2></FONT> </DIV>
<DIV dir=3Dltr class=3Dgmail_attr><FONT=20
size=3D2>Paul.</FONT></DIV></DIV></DIV></BLOCKQUOTE></BODY></HTML>
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