LT77 &
R380 Morgans Speed Gears - Plus 8s from 1977-2004 , Plus 4s from
1987-2000
by Lorne Goldman
As time
passes some wines and some Morgans stand out from the others.
Their value increases and owners
put more money into them than other models. This is true of the Classic Plus
8 line which sadly ended its 36 year run in 2004. As if it was a sign, the
Plus 8 Anniversary Celebration in 2003 was the last Morgan event
that Peter Morgan attended before his passing a few weeks later.
The model is infinitely flexible,
giving owners more options for personalization, while maintaining its essential
character, than any other Morgan. For example, bhp can be tweaked anywhere
within a range of a stock 140ish to a Class A Morgan Challenge
Racer at something around a race reliable 375bhp, though pleasant road car
power tops out around 280 bhp. Rob Wells is correct...with stock size
tyres one cannot get the power to the ground beyond that, so why bother unless
you are a hot rodder?
Like other affectionatos,
I have been saddened in the last two decades to see drop in owner interaction
with their Morgans. Is it a new owner demographic? Hands-off
technology or an aging population? Much of the lore of these machines
seems to be disappearing. Yet with power enhancements and tweaks still going
strong, the lore is still vital.
THE RIGHT SPEEDO GEAR
I have recently been approached with questions of how to get a speedo to
match the real speed. The age of GPS has made owners more sensitive
to speed anomalies. A short tale! When the Factory and I
were rebuilding my Plus 8, I noticed after the 2-3 test run that the speedo
was too slow. I had fit the car with a more agressive BTR ratio.. 3:45:1 (rather
than the 3:23 or the 3:08) on the advice of a number of UK dealers I trust. Of course, the speedo was off....showing
a faster-than-reality speed by 11%. When I reported this to a racer/dealer
I most respect, he replied, "Perfect!". (GRIN!)
Despite that wise advice
and being a stickler for perfection, I pressed on.
The LT77 and R380 were used
in a wide variety of vehicles with a wide variety of rear ratios, and power
ranges. Of course, Morgan was the lightest cars that had them, and because
of that, and the lack of load, these boxes can be bullet-proof in a Morgan,
especially
the S version
of the LT77 (last one) and the R380s fit after February 1999. There
is no need to fit a non-Morgan box in anticipation of more power. Admittedly,
the stock ratios married to more power, makes the Plus 8 first gear ...er...unnecessary. Indeed, the nature of the stock gearing
makes my best 0-60s from a second gear start.
As for the speedo, the mentioned
variety of instruments and vehicles gives the owner low cost non-onvasive
options for these boxes.. No need to spend silly money on electronic fit-all
adjustable senders and speedos made to look vintage. Like most other gearboxes, the LT77 and
the R380 have an incorporated, easily accessible assembly consisting of a
transmission turned cable that attaches to the rear of the speedo...(often
interfaced on the way with a speedo transducer mid-way that gives a speed
signal to the ECU). However, with the LT77 and R380, there are five
different gears offered. Each have a different number of teeth and send a
different speed signal to the speedo (and/or the ECU). They each have a different number
of teeth so they turn the cable at different speeds.
They come in different colours
and they can be changed in minutes. Last time I checked..they cost 10£
each.
COLOUR
|
TEETH
|
BLUE
|
20
|
GREEN
|
21
|
BLACK
|
23
|
YELLOW
|
24
|
RED
|
25
|
Aside from the colour, they
all look the same and slip into the speedo gear assembly as shown in the images. Your existing gear will
give you a good idea of what you need as a replacement. A WATCHPOINT. Your
speedo can malfunction if the speedo cable binds, at either end. Make sure
that you replace the assembly and fit the holding clamp carefully and tightly
so this does not happen.