In a message dated 2000-06-07 4:05:52 PM Pacific Daylight Time,
owner-mgs-digest@autox.team.net writes:
<< Twin Cam MKII MGB Datsun 240Z
1588cc 1622cc 1796cc 2393cc
0-30 2.7 4.0 3.9 3.2
0-40 4.8 6.0 5.9 4.9
0-50 7.3 9.3 9.0 6.6
0-60 9.9 12.8 12.5 8.7
0-70 13.8 18.0 17.7 11.8
0-80 18.1 25.4 25.0 15.2
0-90 27.0 NA 34.5 NA
0-100 41.0 NA NA 27.1
1/4 mile 18.1/80mph 18.7/71mph 18.5/72mph 17.1/84.5
MPH/1000 rpm 17.6 18.1 17.9 21.0
>>
Thanks for taking the time to post that list. I thought I'd add a few data
points to it.
Twincam (Motor test) Twincam,4.55, MGC MGB GT
V8
CR box (R&T test)
to:
30 mph 2.6 4.0
2.8
40 mph 4.4 5.6
4.3
50 mph 7.3 7.6
6.4
60 mph 9.1 10.0
8.6
70 mph 12.3 13.7
11.8
80 mph 16.2 17.7
15.1
90 mph 24.6 22.6
19.0
100 mph 40.3 30.0 30.1
25.3
1/4 mile 18.1 17.1 17.6
16.4
Top speed 115 118
I would stress that all that was with a stock engine that the testers never
took above 6500 rpm (not wanting to hurt a new engine, no doubt). That is
below the stock power peak and the times would have improved had they used
the normal redline.
Another car was tested by Autosport in 1962 - it had Webers bolted on, but
was using a 4.1 axle instead of the more usual 4.55. It's figures were as
follows:
to 60 mph 8.1 secs
80 mph 14.5
1/4 mile 16.2
Now compare those times with the MG V8 - yup, faster, even with a wrong diff
ratio, and the fact that again, they were only using 6500 rpm!
I don't want to sound like a broken record, but most people honestly have no
idea what the potential of a good Twincam is. It simply feels like a
different car completely, compared to the pushrod version, and is closer to
Jaguar territory (actually the Weber car was faster than all but the
XK 150S and I have blown by stock 150S cars on the track at top end, though
admittedly my car has more than just a pair of carbs bolted on).
Too bad it took them so long to figure out the faults in their carb
installation - by the time they did, they had killed the engine, otherwise we
would probably have had 1800 cc MGB Twincams, which would have been really
interesting - a 120 bhp B to rival just about anything else in the
displacement class.
Bill Spohn
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