Hi Everyone,

I recently did a AW71 - M46 swap on my '95 940T. The swap worked very well. Instead of using a grossly heavy LH 2.4 stepped flywheel (29 lbs) I had a machine shop drill machine the 58 CPS sensor holes in the side of a much lighter B21/23 flat flywheel (~20 lbs). I had an actual LH 2.4 flywheel for the machinist to take measurements off of and use as a template/guide when drilling the holes into the B21/23 flywheel.

The modified B21/23 flywheel works slick as anything and the result is a much more responsive engine. The nice thing is that at 20lbs the flywheel is still heavy enough to not have any problems with stalling when starting off, etc.

Of course this required using a 8.5" clutch instead of the 9" clutch which works with the stepped flywheel. I don't have any problems with slipping or anything but then again I'm not pushing stupid amounts of horsepower. People with high power engines may want to use a CenterForce 8.5" clutch instead of the standard Sachs 8.5" clutch if they use one of these modified flat flywheels.

Now that the machine shop I used has set up the program on their CNC machine and the machinist knows what he's doing, additional flywheels can be machined at a reasonable price, especially if I take a bunch of flywheels in there for them to do at one time.

If a number of people were willing to participate in a group buy, I could source a number of those flat flywheels from a specialty Volvo wrecking yard that's not too far away from me and get them at a reasonable price and then have them modified to work with LH2.4. I'm not sure what the final cost would be per flywheel but I'm guessing it'll be in the ballpark of $200 - $250 (tops) per flywheel plus shipping. I live in western Canada so I can ship fairly cheaply within Canada via Greyhound. Not sure what it would cost to send UPS ground to the US but it shouldn't be too bad for 20 lbs.

I should mention that you'll need to modify your LH 2.4 crank position sensor bracket to work with these modified B21/23 flywheels. It requires using a file and a dremel to file the bracket down a bit so the sensor sits about 0.1" closer to the flywheel teeth. It took me about 1/2 hour to modify mine and it was pretty easy. You don't need to be that precise with it just so long as you can get the CPS sensor to roughly sit over the center of the CPS holes on the side of the flywheel. A set of $15 digital calipers came in pretty handy for this.

So, anybody interested in this ? I'm not looking for a commitment yet I'm just wanting to see if enough people might be interested in it to make it worth my while doing the research and getting quotes, etc. I'm hoping to get maybe 10 people that would participate in the group buy between here and T-bricks.

Thanks,

Roger