What could cause my engine to seize?

[sapote]

This is aftermarket parts. Single mass flywheel, so you need a sprung clutch.

I understand, but why choose a wrong dimension clutch though. They just need to measure the potential new replacement clutch center hub and compare with the stock one.

[Darbshaw]

I understand, but why choose a wrong dimension clutch though. They just need to measure the potential new replacement clutch center hub and compare with the stock one.

My understanding is that the E39 clutch is rated a little higher for torque/hp than the normal clutch that comes on ZF320 6 cyl cars. I haven't seen one but I'd guess the ZF320 w/ V8 bellhousing is slightly longer to compensate for this dimensional difference in clutch.

So maybe you can get away with an "upgraded" e36/46 ZF clutch and pressure plate, but the cost effective option is to use the clutch from an E39. There also may not be good availability of uprated clutches for the 6-Cyl ZF box that are also sprung

[jayjaya29]

The clutch works if you install it with the spring pack facing the the flywheel. This is a proven combo used on thousands of cars.

The clutch is actually from an E34 M5, not an E39.

[Darbshaw]

The clutch works if you install it with the spring pack facing the the flywheel. This is a proven combo used on thousands of cars.

The clutch is actually from an E34 M5, not an E39.

Thanks for the clarification. This will help my parts repurchasing lol

[samthejam]

OP didn't install the clutch disc backwards from the way its marked.

Also, Sapote, you lost the bet. 😘

I welded the 2 squares I cut out of my bellhousing back on and the trans has seen much more abuse without any negative effects.

https://www.youtube.com/watch?v=fedDfHg3J2w

Jay let me take his car out for a couple of laps at Road Atlanta.

Can confirm the repaired bellhousing holds up in the real world lol

[jayjaya29]

Darbshaw What flywheel are you running?

[Darbshaw]

Darbshaw What flywheel are you running?

JB racing lightweight flywheel. I believe it's the aluminum one. Just got it last winter through BW


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[bigjae46]

Thanks for the clarification. This will help my parts repurchasing lol

Are you running a ZF320? I have a ZF320 with a JB Racing flywheel. I run an E34 M5 sachs sprung hub clutch disc paired with an OE E46 M3 Luk pressure plate and TOB. Unless you can find a non-SAC pressure plate, you do have to install the E34 M5 disc backwards so the springs face the flywheel...it clears.

I have not found an E46 M3 pressure plate that is non-SAC and doesn't come with a clutch disc. E36 and earlier pressure plates I think are too big...I just know they won't fit.

[jayjaya29]

Are you running a ZF320? I have a ZF320 with a JB Racing flywheel. I run an E34 M5 sachs sprung hub clutch disc paired with an OE E46 M3 Luk pressure plate and TOB. Unless you can find a non-SAC pressure plate, you do have to install the E34 M5 disc backwards so the springs face the flywheel...it clears.

I have not found an E46 M3 pressure plate that is non-SAC and doesn't come with a clutch disc. E36 and earlier pressure plates I think are too big...I just know they won't fit.

lol, im running a ZF320 with a JBR flywheel with an e34 m5 clutch (spring pack facing flywheel) and a stock e36 m3 pressure plate. It all works beautifully. Get your mind out of E46 land, you are running an E36 transmission, so run E36 components.

Sam's video above of my car is running this exact combo on an S54.

[jayjaya29]

The only way to run with the spring pack on the E34 M5 clutch facing the gearbox is to run the UUC lightweight flywheel which uses an E34 M5 pressure plate as well, which is much taller then the E36 pressure plate.

[bigjae46]

lol, im running a ZF320 with a JBR flywheel with an e34 m5 clutch (spring pack facing flywheel) and a stock e36 m3 pressure plate. It all works beautifully. Get your mind out of E46 land, you are running an E36 transmission, so run E36 components.

Sam's video above of my car is running this exact combo on an S54.

Is the flywheel an E36 or E46 flywheel? I bought the JBR flywheel when I still had the 420g so I have the E46 version.

Your comment has made me think…yes, should have gotten an E36 flywheel.

I’d make the change to E36 but I am going to toss in a Tilton single disc setup when this clutch is gone. Shouldn’t be too much longer.

[jayjaya29]

E36 flywheel. They seem quite similar, looks like the E46 M3 jbr flywheel has the friction surface inset a bit more. Bimmerworld has a pressure plate that will work with that flywheel that doesnt have the SAC stuff: https://www.bimmerworld.com/E46-M3-L...treet-Kit.html

[Darbshaw]

Yep clutch plate installed backwards. You're in for a world of hurt getting it out.

This was the most accurate statement I've heard. Holy hell I am ready to burn this car down. 5/6 PP bolts out, last one is in the top right and it is being a major PITA

[Darbshaw]

I have a kit that came with a Sachs pressure plate, but I'm unsure of the clutch itself. I'd imagine this is an E34 clutch given the issue.

Do you need to run a sprung clutch with the Sachs PP? Or can I switch to any of the e36 options out there? What are the benefits to having a sprung clutch? This is a full-on track car, so niceties like NVH aren't as huge

[bigjae46]

I have a kit that came with a Sachs pressure plate, but I'm unsure of the clutch itself. I'd imagine this is an E34 clutch given the issue.

Do you need to run a sprung clutch with the Sachs PP? Or can I switch to any of the e36 options out there? What are the benefits to having a sprung clutch? This is a full-on track car, so niceties like NVH aren't as huge

You have to stay with an E46 pressure plate if you have an E46 flywheel. Bolt pattern is different.