Torque converters

[benzine]

I'm currently looking to mate up a RWD auto box (AW71) to a 1.9td (XUD9TE)

I've got the auto flywheel/flexplate from an autobox that was mated to an XUD9 engine so that bolts straight on to my engine. I want to mate the torque converter from the AW71 to it. The torque converter from the XUD engine uses 3 bolts to attach, the AW71 uses 4. Can it be done or will it be imbalanced because of the 3 big holes remaining there? (see crude diagram below) I can't drill 12 holes (lowest common denominator) as the original 3 holes are rather large (to allow access to bolts on the flexplate)



...or the other option, use the torque converter from the XUD. I've no idea if it'd match up with the AW71, plus I don't know how they work. I presume they're specced for each box so it probably wouldn't be suitable.

or do I tap off the starter ring gear and get a new flywheel made up (waterjet/laser cut). That'd be a last resort as I'm broke!

Thanks for any info

[andyborris]

Try it, what you got to lose?

[ianboyd]

why don't you use it as per your drawing, but make a motorcycle type wheel balancer, like this

www.ebay.co.uk/itm/NEW-Portable-Motorcycle-Wheel-Balancer-UPGRADE-CONE-KIT-/400141106598?pt=UK_Motorcycle_Parts&hash=item5d2a44bda6#ht_912wt_1396
get someone to make bigger cones or an adapter on a lathe, then balance using stick on wheel weights, when balanced, weld on the equivalent weight in metal,


could be talking complete tosh though ;D

[scruff]

I'd be concerned with balance too.
As a minimum I'd be looking at getting some slugs turned up to fill the excess holes and weld them in.

If I was doing it I'd use the XUD flywheel as it's going to be safer.

The flywheel has a lot of energy in it, you don't want out of balance or it to let go....

[ianboyd]

Mar 27, 2012 11:54:17 GMT scruff said:

I'd be concerned with balance too.
As a minimum I'd be looking at getting some slugs turned up to fill the excess holes and weld them in.

If I was doing it I'd use the XUD flywheel as it's going to be safer.

The flywheel has a lot of energy in it, you don't want out of balance or it to let go....

auto flywheels are not like manual flywheels, more like a bit of 4mm plate with the ring gear welded to it, and the torque converter fitted to that,

I suspect the torque converters of both will be similar in performance, the only difference could be the speed it transfers the torque, so if they came of an engine with similar power and torque, then it will transfer that torque in a similar fashion, so fit the easiest one to make work

[benzine]

Thanks for all the replies. I didn't even think of modding the auto flywheel and getting it balanced, that seems like a good route to go.

Mar 27, 2012 12:17:20 GMT ianboyd said:

I suspect the torque converters of both will be similar in performance, the only difference could be the speed it transfers the torque, so if they came of an engine with similar power and torque, then it will transfer that torque in a similar fashion, so fit the easiest one to make work

XUD: 92bhp, 145lb/ft
Volvo AW71 came from: 114bhp, 136lb/ft

so similar ballpark. I'll find out the spline info from the XUD autobox, if it's the same then that would be the easiest route by far.