6/83 grey market 323i.. mtech I S50 5-lug

[kronus]

sleeving cylinders is unfortunately not 60 a pop in the bay area

also I want new pistons anyway cause these are all pocked up

[ThatOneEuroE30]

I got excited last night because I know someone who has a refreshed S52 block, but now I see you're looking for a S50 block... booo

He can just sleeve those 3 cylinders there is nothing wrong with doing that. I know many people that have done it and couple that are running sleeved s5x's in race cars with zero issues. plus sleeving a cyl is like 60 a pop. that will be far cheaper then a new rotating assembly

[2mAn]

I got excited last night because I know someone who has a refreshed S52 block, but now I see you're looking for a S50 block... booo

[delamaize]

*cough* M60 *cough*

lol

[2mAn]

ugh.... this sucks.

[ThatOneEuroE30]

soo, bad news (sorry 2mAn)

I took the S50 apart further and had a good look at the cylinder bores. It has deep scoring down 3 of the bores, and most of the pistons have valve contact. The valve contact is not a huge deal breaker (they're mostly intact, ring lands don't look crushed), but the bore scoring is deep enough to require an overbore.

I'm thinking to overbore to S52 specs and find an S52 crank and pistons. Sadly this expands the timeframe of the car's completion by a lot.

Anyone have an S52 rotating assembly hanging around?

Why not sleeve those three cylinders?

[kronus]

soo, bad news (sorry 2mAn)

I took the S50 apart further and had a good look at the cylinder bores. It has deep scoring down 3 of the bores, and most of the pistons have valve contact. The valve contact is not a huge deal breaker (they're mostly intact, ring lands don't look crushed), but the bore scoring is deep enough to require an overbore.

I'm thinking to overbore to S52 specs and find an S52 crank and pistons. Sadly this expands the timeframe of the car's completion by a lot.

Anyone have an S52 rotating assembly hanging around?

[kronus]

Yesterday I pushed the 5-lug M3 hubs into the trailing arms. It was straightforward, and ultimately not significantly more expensive than 318ti arms would be.

bearing going in



yup it's in



hubba hubba



done!




I can't put on the brakes yet because the e-brake cables are still on the car and I'm not sure if I want to remove them.

next up, getting the old ass end out of there!

[kronus]

I am working on getting the wiring sorted. For posterity, here's the pinouts of a early square C101, a late round C101, and a '95 X20:



and here's the transformations needed to adapt an early body plug to a S50 harness




I would adapt the body to a male X20, but the amount of pins that would go unused bothers me, so sticking to a C101. new pins are on their way from BMW, and a DIY on packing an S50 harness into an M42 harness housing will be forthcoming.

[kronus]

Also, most don't do e30 m3 hubs in the rear, they use e36 to stuff but that results in a wider track that requires e36-offset wheels to work right. Z4 hubs have a similar issue.

E30 and ti trailing arms are identical afaik, but e30 m3 hubs are narrower and require different caliper carrier brackets. Ti ones are modifiable to work with e30 m3 brake rotors, but it's a pain and kinda sketchy. I lucked into a set of carrier brackets off blunt's m3 so I went with e30 stuff in the rear.

[kronus]

M3 wheels have a wider track to fill the wider fenders.

There was an option in development to use e28 strut housings, but it required a totally custom lower bracket and I don't think the guy ever got too far designing it. Sleeves are easier and far cheaper to machine.

[bradnic]

THAT's what I wanted to know, plus IX specific info thanks Kronus.

[kronus]

For the front I am using max399's hub sleeves, e36 bearings, e46 328i rotors and calipers. E30 m3 stuff is too expensive, e36 stuff has geometry issues, and e46 m3 stuff does not fit over 16" wheels.

[bradnic]

that's exactly my question. and a poor man's bbk of course. anyway don't want to pollute the thread. just thinking here.

[iXguido]

sorry for off topic.. I know you can swap in m3 hubs in the rear pretty easily, but what's the story on the front? it's alot more involved than that right? full strut swap? also m3 front wheels have a wider track than normal e30. then there's the wider track on the IX... Maybe going 5 lug m3 on an IX isn't as hard.

i have a headache now.

What exactly are you trying to do? 5lug ix conversion?