Welcome to our resource for MG Car Information.
MG MGB GT V8 Factory Originals Technical - What's in the tank? Slipping out of reverse?
|New V8 owner (cb ''75) little concerned at fuel consumption (4*) - not the cost, just the fact that something might not be behaving as it should. I'm getting about 180 - 200 miles to a tank with fairly judicious driving and have been told that the car should run rich. Can anyone tell me how that compares?|
Also, the car slips from reverse when the engine is cold. Its fine when at running temperature. I have been told this is a fairly common flaw. Am I being strung a line?
Any help would be appreicated.
|I have a R/B '75. Can get 27 to 28 mpg on 4star, touring on continental roads at a very steady 65 - 75.|
UK 12 mile urban commuter run by my wife increases consumption to around 22 / 23 mpg.
Not using it at the moment so cannot comment on what difference Unleaded will make.
|If you have a factory V8 you should be using ordinary unleaded anyway, and it needs no adjustments.|
180 to 200 miles on a tank is low, I could possibly get 250 or more, it frequently goes over 200 with still 1/4 left. This equates to 26 or 27 mpg, but it does include longer runs. If I have a spell of local runs it drops to about 21 or 22, i.e. type of use makes a huge difference.
Never heard of slipping out of reverse as being 'common' (it is the same as the 4-cyl car). But any gearbox with wear in particular areas will slip out of any gear.
My factory box was showing the sympton you write about
at about 130,000 so I had it refurbished - which solved the problem.
I am now running with a LT 77s box but the change is unrelated.
Your fuel consumption may be consistent with the state of the box - new needles/air filter cartridges/breather
filter and flame traps would be a good start - I get 20 - 22 mpg from a 3.9 (weak mixture/mixed town & long distance).
finally - if all else fails - use the car's performance and drive car the way the makers' intended - they can get quite constipated.
This thread was discussed between 28/10/1999 and 01/11/1999
This thread is from the archive. The Live MG MGB GT V8 Factory Originals Technical BBS is active now.