[CobraMarty]

Used parts, they think they are selling gold.
Looking for a used block, outrageous prices. Cheapest is $200 from Germany with $200 air freight.
Buying a complete engine is almost cheaper.

And the cam doesn't control the lift, it does but not directly. The Valvetronic secondary rocker system allow the ecu to control the valve lift. It is variable lift from near 0 lift at idle to 9.7mm lift at WOT conditions. It is this secondary rocker system I am referring to for the extra lift.

[justpete]

Originally Posted by CobraMarty

And the cam doesn't control the lift, it does but not directly. The Valvetronic secondary rocker system allow the ecu to control the valve lift. It is variable lift from near 0 lift at idle to 9.7mm lift at WOT conditions. It is this secondary rocker system I am referring to for the extra lift.

Seriously? No kidding, that's what I said to begin with i.e., cam and rocker ratio control lift. Again, all Valvetronic does is modulate the lift between minimum and maximum. It has _zero_ ability to increase it any further than the maximum value controlled solely by the cam and rocker ratio, neither of which is a variable in the system. You can't change the secondary rocker system, you can't modulate the secondary rocker ratio, you can't do anything via the secondary rocker other than modulate lift between pre-determined limits. Sheesh...

[hassmaschine]

Originally Posted by CobraMarty

Used parts, they think they are selling gold.
Looking for a used block, outrageous prices. Cheapest is $200 from Germany with $200 air freight.
Buying a complete engine is almost cheaper.

And the cam doesn't control the lift, it does but not directly. The Valvetronic secondary rocker system allow the ecu to control the valve lift. It is variable lift from near 0 lift at idle to 9.7mm lift at WOT conditions. It is this secondary rocker system I am referring to for the extra lift.

it can't increase lift beyond the mechanical limits of the camshaft. you can't just tell it 11mm and get it - the rocker ratio is already maxed out at 10mm.

valvetronic actually doesn't adjust lift directly. that is directly controlled by the camshaft. what it does change is the rocker ratio, which changes how much the valves open when the camshaft pushes on the rockers. the max rocker ratio is about 1.35, and it can't be increased beyond that. Thus, the only way to increase lift is with a different camshaft.

[hassmaschine]

Long time no post - progress has been slow, but not zero.

Anyway, this came in today:


It's only 7lbs - significantly lighter than stock, which is listed as 23lbs. I'll have to use an M20 starter and 228mm clutch/pressure plate - probably with a Sachs race pressure plate (883082999618), not sure what clutch yet.

The pressure plate is lighter by 2.5lbs, and the since it's 228mm vs 240mm, the mass is closer to the center. Clutch disks are pretty light so that won't make much difference. The '618' pressure plate as it's known is rated at 300nm with a stock M20 clutch disk so with something a little grabbier it shouldn't be an issue with the N52 - and I've beat the hell out of a similar setup that's lasted 80k without issues.

This will of course require the ATI damper since the total mass will be about half of stock.

[justpete]

Originally Posted by hassmaschine

Long time no post - progress has been slow, but not zero.

Anyway, this came in today:


It's only 7lbs - significantly lighter than stock, which is listed as 23lbs. I'll have to use an M20 starter and 228mm clutch/pressure plate - probably with a Sachs race pressure plate (883082999618), not sure what clutch yet.

The pressure plate is lighter by 2.5lbs, and the since it's 228mm vs 240mm, the mass is closer to the center. Clutch disks are pretty light so that won't make much difference. The '618' pressure plate as it's known is rated at 300nm with a stock M20 clutch disk so with something a little grabbier it shouldn't be an issue with the N52 - and I've beat the hell out of a similar setup that's lasted 80k without issues.

This will of course require the ATI damper since the total mass will be about half of stock.

Holy crap! That's one seriously lightened flywheel right there...

[hassmaschine]

It's made from billet steel - came from RHD Engineering in Australia. I asked about making one with a 6 bolt pattern (N52, some N54s), but he said min production was 30 pieces. However, he happened to have this one laying around that was made with a 6 bolt pattern by accident so I got it for shipping cost.

I think a lightweight N52 flywheel is around $800 with no clutch or pressure plate so basically I got this and still have budget left for that ATI damper.

Pretty sure the flywheel will have to be balanced with the crank though. It's probably not too bad being full billet steel but there's no indications on it that they balanced it.

[justpete]

Originally Posted by hassmaschine

It's made from billet steel - came from RHD Engineering in Australia. I asked about making one with a 6 bolt pattern (N52, some N54s), but he said min production was 30 pieces. However, he happened to have this one laying around that was made with a 6 bolt pattern by accident so I got it for shipping cost.

I think a lightweight N52 flywheel is around $800 with no clutch or pressure plate so basically I got this and still have budget left for that ATI damper..

That's even more awesome-y!

[mike-y]

wow that is super light.. probably not great for street driving, but once you get moving it should be a lot of fun.

[Taskmaster]

Originally Posted by mike-y

wow that is super light.. probably not great for street driving, but once you get moving it should be a lot of fun.

Not good as in RPM dropping quicker?

[Terraphantm]

Originally Posted by TheAxiom

Not good as in RPM dropping quicker?

Less inertia makes it harder to engage a clutch and such - much easier to stall. Should be okay in an E30 since it's a light car, but a flywheel this light in an E90 would probably get old real quick.

[Needbmwpartzz]

Where is this e30 it's going in?

[hassmaschine]

Originally Posted by Needbmwpartzz

Where is this e30 it's going in?

The one in my garage

[hassmaschine]

Originally Posted by Terraphantm

Less inertia makes it harder to engage a clutch and such - much easier to stall. Should be okay in an E30 since it's a light car, but a flywheel this light in an E90 would probably get old real quick.

I agree - the E30 is almost 800lbs lighter than my 330i. The flywheel i have in it now is 15lbs, with the same pressure plate - I dont think it will be much worse.

[Needbmwpartzz]

Originally Posted by hassmaschine

The one in my garage

Oooooh.....looks like a shy one lol.
Get her that transplant and she should be less camera shy.

[tlow98]

It's like a bikini flywheel, awesome. And for that $... all smiles. Nice work.

[justpete]

Originally Posted by hassmaschine

I agree - the E30 is almost 800lbs lighter than my 330i. The flywheel i have in it now is 15lbs, with the same pressure plate - I dont think it will be much worse.

800lbs?! Holy crap, that's a helluva lotta bloat in the e9x. Halfway there but doesn't look like it's physically possible to get the rest of the way. Doesn't matter really since there's a min weight in STU. But, 800lbs, dayum!

[Hobbs64]

Hass,

I've been considering the exact same build for my E30 cabriolet. It has a full steel M3 conversion. now it just need a right heart! Can you run a N52 with a BMW DME in stand-alone? if so, how?

[E91 M Sport]

Originally Posted by mike-y

wow that is super light.. probably not great for street driving, but once you get moving it should be a lot of fun.

Lots more clutch wear too slipping it to get'er going.

[hassmaschine]

Depends on the clutch disk really. I'm not worried about it. The setup in the car now is only 7lbs heavier, and I daily drove it for almost 10 years.

[JuniorB]

Since you know of the n54 intake and the higher rpm cababilites,have you considered running it? The n54 throttle body is supposed to be larger,is this true?

[hassmaschine]

No, if anything I'll run the S54 airbox I have.

[Terraphantm]

Would you be using the S54 ITBs too? I know n52 throttle body is normally fully open, but doesn't it use it in certain scenarios?