The comprehensive DOHC engine swap thread.

[Wishno87]

So you essentially took an "e" flywheel, shaved it down 2 pounds from the inside and made it work that way? What tranny did you use? Is using the "i" flywheel a bad idea when pairing it to the g240?

I dont know anything about what setup you need for a G240 but I have a G260 and used a euro 323 flywheel which is already a dinner plate so I did not need to shave it down. Most stock single mass M20 flywheels need to be shaved down though. Now that I think about it im pretty sure people have no issues using an "I" flywheel but I dont know what TO bearing you will need.

[phreshkid]

(Dude read every page of this thread before you ask a question like that)

Because Im nice: If you have a single mass FW keep it and have the rear shaved down. Bolt that to your S50 and everything else should work with it. Use your M20 starter too. I have an M20 FW and clutch setup in my 24V and it works fine. There is a lot more to it than that but you get the condensed version.

So you essentially took an "e" flywheel, shaved it down 2 pounds from the inside and made it work that way? What tranny did you use? Is using the "i" flywheel a bad idea when pairing it to the g240?

[Wishno87]

What goes into swapping an auto s50 into a manual e30? I want to keep my e30 manual.

(as far as trannies go)

(Dude read every page of this thread before you ask a question like that)

Because Im nice: If you have a single mass FW keep it and have the rear shaved down. Bolt that to your S50 and everything else should work with it. Use your M20 starter too. I have an M20 FW and clutch setup in my 24V and it works fine. There is a lot more to it than that but you get the condensed version.

[jaywood]

What goes into swapping an auto s50 into a manual e30? I want to keep my e30 manual.

(as far as trannies go)

[phreshkid]

The underdrive pulleys are tricky in the sense that if you compare m50 pulleys to s50 pulleys, they are different in many ways. I think the s50 pulleys were lighter than the m50 pulleys. I haven't checked part numbers but I had 2 s50s an m50 and an m52 and I did notice some differences. I'm not sure if this helps with anything but if you take conceptual physics and a little common sense into consideration, reduction of rotating mass does have a profound effect in terms of how easy or hard an engine is allowed to run. There is a limit to how light you can go before problems arise, take the flywheel for a prime example.

I don't really know what relevancy my statement had to anything you said but I said it anyways.

Good luck with your swap man and nice wheels.

[Jand3rson]

I know it's an M50. I think you nailed it with smoothness and presentability. I'm going to do a chip and ebay headers, but that's pretty much it for this first incarnation. I think I mentioned it before, my long-term goal is to supercharge it.

[phreshkid]

Janderson, you have an m50. I really wouldn't worry too much about about power if I were you. Stick with smoothness and presentability with this swap. I just swapped in an m52 and while it's a measurable jump over the m42, it's still not that worthwhile in terms of power. What are your overall plans for this swap anyways?

[Jand3rson]

Has anyone done a set of underdrive pulleys with their 24V swap, specifically with an M50? I did some research tonight and found that most people were seeing about a 5-10 hp increase with a full kit (alternator/power steering/water pump), and Turner claims 10.7 hp on the M3 with theirs. Is this something that's worth the money, in conjunction with other bolt-ons/offs? Also, why does UUC's underdrive kit not include the alternator?

[BimmerTim]

Alright y'all, braking system question. I was going to do the whole "slot the firewall" thing with the stock booster, but I'm getting a Porsche 944 booster for free. Can I use the stock E30 master cylinder, or do I need the 944 one? I read somewhere that the E30 and the 944 masters are the same bore/diameter/something.

90% sure you can use the stock one.

[luckysnafu]

ok i looked and looked and have seen a few people ask this in different places, but no direct answer

m52 out of a 98 328is... going into an e30.. want to stick with obd2.. can i save some time and just buy the treehouse wiring adapter or am I going to have to do the wiring legwork?

thanks

I just swapped an m52 from a 96 328is into my e30 and kept obd2 (and ews). The wiring isn't that hard and I can help you out with it. What e30 are you putting the m52 into? I have wiring diagrams for a 91 318is and an 87 325e.

[Jand3rson]

Alright y'all, braking system question. I was going to do the whole "slot the firewall" thing with the stock booster, but I'm getting a Porsche 944 booster for free. Can I use the stock E30 master cylinder, or do I need the 944 one? I read somewhere that the E30 and the 944 masters are the same bore/diameter/something.

[northmiler89]

ok i looked and looked and have seen a few people ask this in different places, but no direct answer

m52 out of a 98 328is... going into an e30.. want to stick with obd2.. can i save some time and just buy the treehouse wiring adapter or am I going to have to do the wiring legwork?

thanks

[Jand3rson]

Went back and tried again, the pulley and the crank gear came right off after pulling those! A/C bracket removed, but I damaged my crank position sensor when I pulled it, accidentally put a big dent on the underside of it, probably rendering it useless. Anyone got a spare? If not, looks like they're only like $35 or so.

[Jand3rson]

Awesome, I'll check it out.

[gregslow318i]

you just have to pull the 6 13mm bolts on the crank that hold the pulley on, then the 2 13mm in the front and 4 13mm on the side to pull the bracket off