owas · Mar 18, 2019

So clearly I need another project to add to the list.

How feasible of an idea would it be to have an electric motor hooked up to the PTO output on the transfer box that would work in conjunction with the engine rather than running the car on its own?

I was thinking a bit more power/torque and better mileage?

flat · Mar 18, 2019

I think it would be exceptionally hard to make work properly.

Look into by complicated hydbrids etc are, it’s not just a simple as slapping a motor on somewhere!

Al2O3 · Mar 18, 2019

owas said:
So clearly I need another project to add to the list.

How feasible of an idea would it be to have an electric motor hooked up to the PTO output on the transfer box that would work in conjunction with the engine rather than running the car on its own?

I was thinking a bit more power/torque and better mileage?

I've no idea really. However, my first thoughts would be that the PTO output would be geared down and so you'd be at a mechanical disadvantage trying to input power through it. Just thinking out loud

jamesmartin · Mar 18, 2019

Al2O3 said:
I've no idea really. However, my first thoughts would be that the PTO output would be geared down and so you'd be at a mechanical disadvantage trying to input power through it. Just thinking out loud

pto input would be same ratio as g/box output shaft so when g/box was in 4th gear it would take the same torque from engine or electric motor

Al2O3 · Mar 18, 2019

jamesmartin said:
pto input would be same ratio as g/box output shaft so when g/box was in 4th gear it would take the same torque from engine or electric motor

Cheers, James.
Does that mean he would have to stick to 4th gear? Does the PTO work in 5th or is it restricted to 4th?

jamesmartin · Mar 18, 2019

Al2O3 said:
Cheers, James.
Does that mean he would have to stick to 4th gear? Does the PTO work in 5th or is it restricted to 4th?

no it works in any gear ,its just if you applied drive to the pto the torque needed would be equivalent to the engine driving in 4th, the engine has the luxury of setting off in 1st

Henry_b · Mar 18, 2019

Put a V8 in it..

Moar Powah.. 'innit.

Al2O3 · Mar 18, 2019

jamesmartin said:
no it works in any gear ,its just if you applied drive to the pto the torque needed would be equivalent to the engine driving in 4th, the engine has the luxury of setting off in 1st

Ahh, so once the vehicle is going, applying power through the PTO would work!

jamesmartin · Mar 18, 2019

Al2O3 said:
Ahh, so once the vehicle is going, applying power through the PTO would work!

it would work and assist under all loads ,but setting off under just electric motor would require a motor that could cope with that torque

owas · Mar 18, 2019

Henry_b said:
Put a V8 in it..

Moar Powah.. 'innit.

I have 2 already, I don't need a 3rd

http://www.dunsfoldcollection.co.uk/collection/military/ser-iii-military-electric-drive-prototype#v

I don't want electric only though

Al2O3 · Mar 18, 2019

owas said:
I have 2 already, I don't need a 3rd

http://www.dunsfoldcollection.co.uk/collection/military/ser-iii-military-electric-drive-prototype#v

I don't want electric only though

Well there you go, you know it's feasible!

nobber · Mar 18, 2019

The red tape to make it all road legal would be a nightmare.

owas · Mar 19, 2019

nobber said:
The red tape to make it all road legal would be a nightmare.

There's plenty of conversions about so maybe not that bad?
I think insurance might be abit difficult though

Lots of reading to do

owas · Mar 19, 2019

A basic electric system actually seems very simple (I see no reason to go all fancy on a 33 year old land rover)
DC forklift motor
Controller
Throttle potentiometer
Big relay
72v of batteries

The bit I'm not understanding,
With the motor attached to the PTO (presumably they all come with levers to engage drive), how should the rpm of the motor be controlled in relation to engine speed, or doesn't it matter if they're working together?

300bhp/ton · Mar 19, 2019

Interesting idea.

Henry_b · Mar 19, 2019

Surely any benefit of the added motor would be made redundant by all the extra Baggage of batteries and components you'd have to haul..?

owas · Mar 19, 2019

Henry_b said:
Surely any benefit of the added motor would be made redundant by all the extra Baggage of batteries and components you'd have to haul..?

Ive never noticed much difference when I've had a few hundred kg in the back

Well other than how much more comfortable it is

kevstar · Mar 19, 2019

Henry_b said:
Surely any benefit of the added motor would be made redundant by all the extra Baggage of batteries and components you'd have to haul..?

That's a great excuse to buy another Sankey.

owas · Mar 20, 2019

I'll give my insurance a ring in the morning and see what they say, **** off probably

FlyingPete · Mar 20, 2019

owas said:
The bit I'm not understanding,
With the motor attached to the PTO (presumably they all come with levers to engage drive), how should the rpm of the motor be controlled in relation to engine speed, or doesn't it matter if they're working together?

The motor spins at the gearbox output speed, all the time. There is no rpm matching needed as they are mechanically connected and spin together. The applied motor current then determines the driving or braking torque provided by the motor. A free-spinning motor with no load applied has minimal drag torque.

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Think outside, no box required.

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Think outside, no box required.

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