The MG Metro Turbo uses the "A-Plus" engine in 1275 cc form. This was the then
latest version of the A series engine, with a slightly thicker bottom (gearbox)
flange and heavier duty bearings for the turbo.
The HIF44 carb is a blow through version with the float chamber pressurised by
the boost pressure. An anti-runon valve vents the float chamber to atmosphere
when the ignition is off - it it fails fuel cannot get out of the jet , hence
the car stops.
If you want more technical info (CR, boost, etc.) let me know and I will post
it on the list.
The Leyland engineers that designed the installation were concerned about the
life expectance of the gearboxes and setup the turbo/wastegate arrangement to
give a maximum torque (about 90 lb/ft at 3000 rpm) rather than maximum power.
As the revs rise above the max. torque speed the boost pressure controlling the
wastegate is bleed off, allowing the wastegate to close a little and generate
more power upto a peek some where around 7000 rpm where the ignition rev
limiter operates.
The Turbo system fits very easily into the engine bay of a 1275 Midget/Sprite!
Dave B.
72 BGT V8
76 Midget
Date: 24-Aug-1995 04:55pm
From: Dave Brooke
BROOKED
Tel No: 01923 664574
Subject: Re: MG Metro Turbo?
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