Diff ratios

[carat 3.6]

Are you definitely going to use the auto box, or is there still hope for the getrag box?

Just thinking you could use one of the sprinter flywheel conversion kits, to solve the short input shaft problem?

http://www.ebay.co.uk/itm/Sprinter-...arts_Vehicles_CarParts_SM&hash=item3351947dad

 

[Druk]

The autobox is going to cost too much to repair and commission so it's down to the Getrag. Since it has a 1:1 5th gear I'm going to need as low a diff ratio as I can get. Pre 85 W126 500SE or SEL 1:2.24 fits the bill. Single mass flywheel conversion looks likely.

 

[carat 3.6]

I think the conversion kit should fit the 606 crank, but I dont know if it is the same size of flywheel.

Thanks for the link to the super turbo diesel site by the way.

 

[bolide]

I think there's a typo in your post re W124 E300 Diesel box - it's a 722.435

Your best option might be the auto out of the W210 - I think that's a 722.436 and the only difference between that and the 435 is the electric speedo drive for the W210. The two drives can be swopped

The gearbox control system for the 606 engine uses restrictors & a vacuum pump as there is no inlet manifold vacuum. On the W124 there is vacuum pipework & solenoids on the offside under the EGR. I believe the inlet manifold crosspipe butterfly valve vacuum system is not present on the turbo version so that bit is not relevant

Another gearbox is the Getrag. You'll need to think about diff ratios as you say

Is the rolling circumference of the tyres on the SL the same as on the W210? If not you need to figure that into the gear calculations

If you have power curves for the original engine you can calculate the rpm @ 70 mph and mark that on the curve to see the maximum power at those revs. So long as the W210 engine meets that it should pull that speed without a problem. It'd be interesting to see how the torque figures for the two engines differ at that rpm

I haven't read the whole thread till this evening so apologies if some of my posts have been a bit out of sync with what's going on

Nick Froome

 

[Druk]

This whole gearbox thing is doing my head in

Here are the choices...

As Nick pointed out. The 722.435 four speed auto from a non-turbo 606.
This box needs the vacuum control and the pull cable to make operable and anyway is doubtful to take the turbo's torque. Discounted.

The 722.608 electronic box as fitted to the 210 turboD. Up until a couple of days ago this was the box of choice but has now also been discounted on grounds of minimal clearance, weight, and fitting costs. This is a pity cos it has the overdrive top gear. However! Such is life.

A 717.412 manual 5speed with overdrive. I have all of this except the flywheel/clutch but that's not a problem since it has the long input shaft which is mated to a single mass flywheel which I can get. But! something inside this box needs rectifying cos it has a scream when really cold. (Probably a loose bearing). There's major doubt if this box will withstand the 606 torque. Probably not, so it's discounted.

A 717.450 Getrag manual 5speed without overdrive. I have all of this including the flywheel which is dual mass. This box has the reputation for being immensely strong so probably will take the torque however a dual mass is crap and unreliable so will need a single mass flywheel conversion. This box is the (current) favourite.

With an overdrive box I can use a diff with ratio of 2.8 or close.
Without overdrive I'm looking at 2.2 or 2.4 which will have to come from a 500SE or SEL pre 85 which will fit to my rear subframe.

I'm basing my estimates on the old 2.8 petrol doing 3500rpm @70mph with direct top gear. 3500 is probably close to the max torque curve of this engine.

Ideally, I would like the diesel to be doing iiro 2000/2500 revs @ 70mph hence the 2.2 diff.

It would also be very helpful if there was a source of Merc gearbox internal ratios.

Over to you................



.

 

[carat 3.6]

Mrecedes Getrag manual ratios

Getrag 717.450 (short input shaft with a daul mass), 300ce-24, 320ce.

1: 4.15
2: 2.52
3: 1.69
4: 1.24
5: 1.0
R: 4.40

Getrag 717.404 (long input shaft with a solid flywheel), 190 16v.

1: 4.08
2: 2.52
3: 1.77
4: 1.26
5: 1.0
R: 4.16

 

[Dieselman]

Mrecedes Getrag manual ratios

Getrag 717.450 (short input shaft) with a daul mass.

1: 4.15
2: 2.15
3: 1.69
4: 1.24
5: 1.0
R: 4.40

Getrag 717.404 (long input shaft) with a solid flywheel.

1: 4.08
2: 2.52
3: 1.77
4: 1.26
5: 1.0
R: 4.16

There are some strange ratio gaps there, what vehicles are these for, is the first one a van and the second a car?

 

[carat 3.6]

There are some strange ratio gaps there, what vehicles are these for, is the first one a van and the second a car?

Oops, see the edited post.

 

[Druk]

Oops, see the edited post.

Great, thank-you. Where did you get these? Can you look again please for a 717.412 which was originally from a 230TE W124. (see original post.. )

 

[carat 3.6]

Great, thank-you. Where did you get these? Can you look again please for a 717.412 which was originally from a 230TE W124. (see original post.. )

I'll have a look if I've got any others, I had the getrag ratios from when I put the 16v box behind my 3.6 24v.

 

[krimat2005]

DANE TECHN. - EN
just scrool it down to model you need, all data are in english.

 

[Druk]

Getrag box it is.

 

[carat 3.6]

Looking good.

Clutch and flywheel next?

 

[Dieselman]

Where's the seat going?

 

[LTD]

Where's the seat going?

Back into the SAAB it came from ?

 

[carat 3.6]

Where's the seat going?

No, no, there's a saddle just out of shot.

 

[Druk]

No, no, there's a saddle just out of shot.

And a whip.

 

[carat 3.6]

And a whip.

 

[LTD]

<exits to wipe oneself down ...>

 

[Druk]

DANE TECHN. - EN
just scrool it down to model you need, all data are in english.

Many thanks for that link. it's the same as you put up in post # 19 but for some reason that was corrupted on my 'puter. This one is good though.