I got a neat catalog from MOSS U.K. the other day and figure folks on the list
might be interested in it. Anyway it's sort of a cross between a catalog and
a special tuning manual. Its called performance MGB and contains about 20 pages
on modifying street based MGB's for performance without loosing drivability.
(As opposed to their special tuning catalog which is more race car oriented)
The catalog is mostly comentary on why the particular options where choosen,
and what effect they would have, with test data given for modified cars at the
end.
Anyway they present 3 levels of performance tuning stage 1 (Bolt on additions
only), 2 (minor engine mods) and 3 (overbored engine).
Suspension Mods: All stages
Uprated front roll bar
Urethane shackle bushings
Uprated lever arm or tube shock conversion
1" Lowered front and rear springs
Front springs are "mildly stiffer"
Rear springs are stock re-arched
Alternately they suggest their coil over spring front conversion. I've seen
stuff on this before and it looks good altough at 300 U.K.pounds it should
be. (L. Porter highly recomends this in his DIY restoration book)
Braking Mods
All Stages: Stainless Steel Hoses
Stage 1: Uprated Pads
Stage 2: Vented Disks and 2 pot calipers
Stage 3: Vented Disks and 4 pot calipers
Engine Mods:
Stage 1: K&N Filter and LCB header
Stage 2: Stage 1 + polished head, high lift street cam, tailored
Distributer, and either Weber or HS6 carbs
Stage 3: 1950 cc Engine with Weber carb, and mild cam
Clutch Mods: (Recomended only)
All Stages: Fast Road clutch with roller release bearing
Anyway they did rolling road test on all the cars and got the following
performance figures:
Stock MG (1974 80,000 miles on engine never rebuilt) 74.1 bhp @ 4508 rpm
Stage 1: (Same car as stock) 80.7 bhp @ 4380 rpm
Stage 2: (Say 1980 but in description refer to it as CB so am not sure
engine rebuilt 15,000 miles ago)
SU HS6 97.7 bhp @ 4858 rpm Weber 45 DCOE 100.3 @ 4773 rpm
Stage 3: (1980) SU HS6 104.5 bhp @ 4711 rpm Weber 110.8 @ 4528 rpm
These figures are given as bhp at the flywheel
Note they said they could get 15-20 more bhp on the 1950 cc by uprating the
cam but the object was to make a car that was drivable under all road conditions
Hence the perfomance figure, are not that much improved from stage 2.
Anyway I found it interesting. Note the difference between the measured bhp
and the 98 bhp quoted as standard. They quote the bhp as being at the flywheel
although I would think with a rolling road it would be at the wheels.
Gary Burrell
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