G/box: 4 speed/OD M46: Just checking: Automotive crime might be committed...

[Army]

G'day Folks,

I've recently acquired an M46 (gearbox plus overdrive) with the intention of trying to fit it to my PV544...

...in order to do this I need to cut up two bell housings: One from a B18/20, the other that came with the M46 and weld them together. The Bell housing on the M46 has a gucci cut out for a crank position sensor which I assume is used in the wonderful world of continuous fuel injection.

How rare are the bell housings on the M46 with the cut out?

I've seen a few gearboxes advertised with hacked out holes in their bell housings so I thought perhaps it might be an automotive crime to mess with this thing.

What say you?

Is the bell housing with the gucci cut out worth more than the normal one?

[classicswede]

The type with the cut out is most common as this gearbox is most often found on 740 turbos.

The cut out is not for CI but EFI

You don not need to cut up two bellhousings just cut the M46 one and rotate

[Army]

Originally Posted by classicswede

The type with the cut out is most common as this gearbox is most often found on 740 turbos.

The cut out is not for CI but EFI

You don not need to cut up two bellhousings just cut the M46 one and rotate

Oh right brilliant!

Thanks for that - at least I've saved one bit (I feel bad about needless destruction)

[classicswede]

Its nice to see someone thinking rather than just chopping bits up

[Army]

Originally Posted by classicswede

Its nice to see someone thinking rather than just chopping bits up

Oh whilst I've got your attention



(drum roll - deep breath - here it comes)


I've been looking for a silly simple EFI system that doesn't use a computer that is linked to every small tiny detail of the car. I don't want to have to "fool" a computer that there's an airbag or air conditioning or brake warning sensors or a wifi connection etc etc...

...but I also don't want to spend loads of dosh on a tunable megasquirt (or equivalent) system.

As you mentioned EFI being the reason for the cut out in the bell housing can you point me in the direction of a good description of the EFI fitted to the Volvos of the age of the M46?

I'd like to know if it is a little bit like CIS KE II where there's essentially just a simple feedback loop between fuel and the O2 sensor (I know there are other sensors involved but essentially the CIS KE II "computers" don't really do all that much do they).

[Clifford Pope]

I don't think it's just for fuel injection. The B230K carburetor engine has a crank position sensor at the top of the bell-housing.

[classicswede]

Originally Posted by Army

I've been looking for a silly simple EFI system that doesn't use a computer that is linked to every small tiny detail of the car. .

As you mentioned EFI being the reason for the cut out in the bell housing can you point me in the direction of a good description of the EFI fitted to the Volvos of the age of the M46?

I'd like to know if it is a little bit like CIS KE II where there's essentially just a simple feedback loop between fuel and the O2 sensor (I know there are other sensors involved but essentially the CIS KE II "computers" don't really do all that much do they).

The B20 did come with K jet and is as simple as you can get. KE is just a touch more refined. Both systems are ok but can be problamatic to fix

Djet is also considered trouble and many of teh parts are hard to come by.

What I am considering for one of my builds is to convert to LH2.4 Its about as simple as EFI gets and there is a reasonable bit of support out there for it.
If you are fitting to a 8 bolt crank engine like I am fitting is very simple

[Army]

Originally Posted by Clifford Pope

I don't think it's just for fuel injection. The B230K carburetor engine has a crank position sensor at the top of the bell-housing.

Originally Posted by classicswede

The B20 did come with K jet and is as simple as you can get. KE is just a touch more refined. Both systems are ok but can be problamatic to fix

Djet is also considered trouble and many of teh parts are hard to come by.

What I am considering for one of my builds is to convert to LH2.4 Its about as simple as EFI gets and there is a reasonable bit of support out there for it.
If you are fitting to a 8 bolt crank engine like I am fitting is very simple

After my KE experience I have no intention of fitting CIS to anything! No point shooting yourself in the foot. I can safely and confidently say I can fix any Mercedes KE CIS system but man it was a struggle getting that kind of ability...

The LH2.4 sounds like a more interesting solution (I've just googled it quickly - I will read more)

Do you happen to know the following

1) 1969 B20 - 8 bolt or not?

2) 60-2 flywheel needed?

[Army]

Oh dear it looks like 6 bolt cranks were used until 1973. (Well that's what interweb seems to think)

[classicswede]

69 would be a 6 bolt

you could get a 6 bolt flywheel machined with the trigger pattern

or

you could fit a trigger wheel to teh front pulley but this would be harder to setup