The semi-Comprehensive M60b40 into E30 swap Q&A

[nrubenstein]

It doesn't seem like the 6 speed is THAT much worse.

Assuming they are geared for the same top speed in top gear, a 6 speed car will be WAY faster than a 5 speed around a track. Gearing is awesome, and its one reason why my friends S2k keeps up as well as it does.

Depends on how much power you're pushing. Shorter diffs have smaller teeth and are less durable.

[Jean]

I don't believe so, or maybe it's the cams or the valves that are different. check realoem.com ?

[The Dark Side of Will]

Do M60B30's and M60B40's use the same cylinder heads?

[The Dark Side of Will]

That's cheaper than I would have expected for those parts. They're ~$3200/set MSRP.

The M60 intake mating surfaces are coplanar between the right and left heads. The S62 surfaces are tilted inward a little bit. The S62 throttles have two retaining studs per port, while the M60 manifold takes a stud between every pair of ports.

So you could whip up simple adapters to bolt the throttles to the head, but they'd be at different angles. If you angle milled the adapters to get the angles right, then the throttles would be out of position. In either case, the S62 plenum wouldn't fit. If you're willing to go Alpha-N engine management with inidivual filters or maybe a pair of smaller 4-cylinder plena, it could work. By then you'd have a good bit of additional effort and expense tied up in the conversion to individual throttles.

Without ALSO porting the heads and upgrading the cams, the throttles by themselves probably wouldn't be worth much extra power...

[bmwmech1]

And kind of period correct...

Garey

[bmwmech1]

S62 throttles do not bolt directly onto an M60... wouldn't call them cheap, either...

Meh, I've found a couple of sets for $4-500... milling adapters would be easy... or maybe go oldschool and run 4 Webers or Dellortos.. That would be kind of sweet...

Garey

[The Dark Side of Will]

S62 throttles do not bolt directly onto an M60... wouldn't call them cheap, either...

[bmwmech1]

Yes, most M60/M62 swaps will be using OBDI DME, but S62 swappers don't have that option. Swappers who want to use M62TU's and keep the VANOS have to use OBDII DME as well.

Your stories of Frankensteined M60's do have me intrigued. $500 for an M60 and $800 for an M62, both within easy driving distance could be put together to make 320 HP for $1500...

Yup, mine is done and ready to swing into the car. Plus, you get the double valve springs and double row timing chain. And you can always add the ITB's and pick up more HP...

Garey

[The Dark Side of Will]

Yes, most M60/M62 swaps will be using OBDI DME, but S62 swappers don't have that option. Swappers who want to use M62TU's and keep the VANOS have to use OBDII DME as well.

Your stories of Frankensteined M60's do have me intrigued. $500 for an M60 and $800 for an M62, both within easy driving distance could be put together to make 320 HP for $1500...

[bmwmech1]

Since the E34 and the E30 are from the same era, most guys will go with the M60 management, so it's a non-issue... BUT it is a good point for guys wanting to get into the later management systems. It also follows that the flywheel must support the management system, as well. You can use a late model flywheel with the trigger ring on it for an early management system, but not the other way around. So that needs to be paid attention to, as well...

Garey

[The Dark Side of Will]

Came across a reference today to the M62 and S62 using a crank sensor in the bellhousing reading a trigger wheel on the flywheel.

So be careful that your transmission will support the engine management you choose.
I already grabbed a 5 speed, so I'll have to modify the bellhousing to include the crank sensor for my S62 swap.

Also, check out www.car-parts.com for ANY used OE part you might want for swaps like this.

[bmwmech1]

To anybody that knows, if I were to use a 265mm clutch and flywheel with an e39 6sp what clutch slave would be required?

The one that goes with the 265mm clutch kit, which would be the E34, if using an OEM clutch. If using an aftermarket clutch, then use the one recommended for that specific aftermarket clutch kit. They are different, as I found out earlier this week. I was retrofitting a stock E39 DM flywheel and clutch setup back onto an 01 540i which had the 850CSI 280mm clutch and lightweight flywheel setup on it. The slave from the 280mm clutch kit was about 5-6mm shorter than the OEM slave for the stock flywheel/clutch...

Garey

[bmwmech1]

thank you, thank you!

so in laymans terms (if i'm understanding correctly):

5spd:
240mm flywheel only
any e36/e39 b28 clutch kit

6spd:
240mm or 265mm flywheel
respective V8 clutch kit only

You got it now...;)

Garey

[g3n0cid3]

To anybody that knows, if I were to use a 265mm clutch and flywheel with an e39 6sp what clutch slave would be required?

[mkcman17]

thank you, thank you!

so in laymans terms (if i'm understanding correctly):

5spd:
240mm flywheel only
any e36/e39 b28 clutch kit

6spd:
240mm or 265mm flywheel
respective V8 clutch kit only