Hopefully a few others may be interested in the idea of this.

I have taken an interest in the Ford MT75 4x4 gearbox.

I have always wanted to make my civic coupe into a 4wd, the reasons for this are my own but i need some advice.

I am fully aware that the B series honda engines, run backwards compared with their ford counterparts, so therefore transplanting the gearbox into my car will result in 5 very pointless speeds of reverse, so matter how reliable each one of them is.

My question is that, contrary to many modern awd transmissions, the engine is mounted longitudionally and DOES NOT have the differentials built into the transmission case. If anyone has any experiance building trikes for example, you will find as i have, flipping the axle (running the differential upside down) will result in the wheels spinning the opposite way, in my case correcting the direction of rotation of my yamaha shaft drive.

I was concerned with whether this same principle would work with a car transmission.

1) A helical cut gear set will not work in reverse very well, so a dog engagement gear set will be required in the gearbox itself.

2) Could the differentials, both front and rear be mounted upside down, to convert the reversed gearbox output into the proper fashion.

Hopefully someone out there has some experiance with transmissions in this detail or specifically the awd MT75.


At the moment this is just an idea, and any help off anyone would be greatly apprechiated. Even if it turns out to be impossible, it is worth asking the masses.

Thanks

 

why not spin the motor backwards?

 

Thanks for the suggestion,

This thought had crossed my mind, having an external oil / water pump and i believe custom cams it would be possible. i am not sure about the cambelt, obviously the rotation change will put belt tension against the belt tensioner, which may effect the timing.

Do you know of any solutions to this, or whether its simply not a problem.

 

You can spin it backwards if you only want one foward gear.

 

making a B-series rotate right in stead of left is not that difficult, It's done here many times for autocross.. the waterpump and oil pump for this conversion is readily available, it requires rotating the pistons and modifying the head and using Daihatsu Coil on plugs and pulse sensor where the ignition used to be.... but why not reverse the engine like the old BTcc cars, let it rotate the normal way (left) and put it backwards in the car to a ford transmission with the adapterplate......Go for it Chris......!!!!

 

Thanks Randall

I believe i have finally worked out completely what i need to to to make my B20vtec run backwards...

I had simply assumed that i would use an external dry sump and external electric water pump for this job, but i see here you said that "the waterpump and oil pump for this conversion are readily available", this got me thinking, is there a compatible or aftermarket conversion available to allow the oem waterpump to run backwards???