How many revs at 70 mph

This thread had me thinking about an article I just finished reading in Land Rover Owner International about a guy that converted his Landy
to a 5.9 liter Cummins Diesel and fitted a different transmission.
He reckons he can sit at 70 mph at 1400 rpm. :shock:
 
unstable load said:
This thread had me thinking about an article I just finished reading in Land Rover Owner International about a guy that converted his Landy
to a 5.9 liter Cummins Diesel and fitted a different transmission.
He reckons he can sit at 70 mph at 1400 rpm. :shock:
Click to expand...

well I guess if u can generate the torque and have an appropriate gear ratio anything is possible. or was it 1400 tick over and the speed reached was vertical???

coop
 
hi, I just googled the engine.... 440 ft/lbs at 1600 rpm... now that is some torque from what I can see goes up to nearly 850 if u buy the bigger 6.7 engine. u got to have a proper gearbox and drive train to handle that
coop
 
He fitted another box in it out of a light truck.
The R380 would be in pieces by the end of the street with the new engine, I'd think.
 
unstable load said:
This thread had me thinking about an article I just finished reading in Land Rover Owner International about a guy that converted his Landy
to a 5.9 liter Cummins Diesel and fitted a different transmission.
He reckons he can sit at 70 mph at 1400 rpm. :shock:
Click to expand...

My Audi sits at around 1,500 at 70mph. It does change down to 6th if you even look at the throttle, but it is very low revving, very torquey engine.

Richard
 
The Rover Tacho is a rather unusual one in that it is essentially an Ammeter, measuring the current draw of the ignition circuit rather than counting the pulses. Unless the tacho itself has the wrong internals or is faulty in some way the circuit must be running a higher current. I'd look at the resistor first as if it has been short circuited to give a brighter spark (or because it burned out), the tacho will read high.
 
mikecoombs said:
The Rover Tacho is a rather unusual one in that it is essentially an Ammeter, measuring the current draw of the ignition circuit rather than counting the pulses. Unless the tacho itself has the wrong internals or is faulty in some way the circuit must be running a higher current. I'd look at the resistor first as if it has been short circuited to give a brighter spark (or because it burned out), the tacho will read high.
Click to expand...

Er, well........the rvi tacho is not an ammeter in a conventional sense at all, although it does measure the eddy currents produced in the ignition low tension circuit which result from the back emf produced when the points open ( this is the bit of the spike in the low tension circuit which one can see on an oscilloscope as a series of waves of diminishing amplitude tailing away ) and it is notoriously unreliable ( I am wrestling with a defunct one at the moment and looking for a circuit diagram ) and also susceptible to interference from stray or sneak currents in other circuitry.

I think it is far more likely that your tacho is past its best - the wavering needle certainly suggests this - than that your transmission is in trouble, although it could be a slipping torque converter, but you would be able to hear the revs going up and down with throttle opening and , particularly, closing if this were the case. I should stick a post it over the tacho so that it does not distract you, and see whether the car sounds normal , and also check whether the transmission responds to commands from the selector when moved between D, 2 and ( at a low speed ) 1
 
You must log in or register to reply here.
Back
Top