In a message dated 6/28/2005 8:07:19 PM Pacific Standard Time,
lendich@optusnet.com.au writes:
That's interesting !!
Bill here's a clearer picture. You will notice that
neither of the inside edges line up with the ruler but the top one is much
lower than the bottom one.
The bottom Turbo housing is the housing of choice for
the larger PP and in fact they actually remove the insert from the old housing
( if damaged) and put it in a new one if they can't get the housing they want.
Could be why they idle so badly, but it certainly breathes better - at the
higher RPM.
George,
The timing on the two housings you have is certainly
different. I haven't heard of different timing on turbo housings. The closing
event is the one changed from the look of things. It seems strange that they
would lengthen the closing on the turbo, as this would cause more overlap on a
system with more back pressure. Any chance the second housing might have been
ported?
I don't know why everyone is going on about idle. I have
worked on bridge-ported RX-2s and that car idled worse than any PP I have ever
heard. The only reason that ANY of the racers don't use P ports is that most of
the racing organizations prohibit the mod!
Bill Jepson