How the Frankenmotor Became an S50

[triggrhaapi]

It's stock CR now, it would have been 11:1 as a stroker motor, but you can't use M50 pistons in an S50, haha.

I feel mixed feelings about it, on the one hand it is still a Frankenstein engine, but on the other hand, it's not as exotic as a 2.9 high comp stroker. I really wanted to see what I could do with that.

[PiercedE30]

I understand that........don't worry though, looks like I will *have to* build the 2.9L.......*darn*
lol

[dude8383]

well documented.

i will be watching this!

[BimmerToad]

Thanks for documenting the build. IIRC The E36 Bentley doesn't cover the assembly of an M50 bottom end. Makes me want to grab a NV M50 block and head to a machine shop :)

[matt]

Just messin' with ya dude. :) I there's lots of gay parts on E30's...

Clutch master cylinder: made by FAG
Transmission: made by Getrag (Gay-trag)

should have my engine back from the shop in about a week though. :D

GEH-trag.

Mr Happi - your brake booster would fit better upside down and repainted.

[triggrhaapi]

I guess, it's oriented the same way the stock one was, I mean I guess it doesn't make a difference either way, it just changes where the vacuum line goes. The stock E36 one is plenty long for that.

[triggrhaapi]

Here comes the big payoff!!! Sorry I don't have pictures of the ringing and wristpin install process, or the piston install, but I wasn't in charge of the camera this time.

Here's how it went: I had to install the rings by hand after alot of swearing when the ring install tool turned out not to be working. We also had a stupid non functional ring compressor tool, so I ended up borrowing one from Joe's dad. It was made some time in the BC era, back when man first discovered steel. It also worked beautifully and thankfully is still in good condition for it's stint at the Smithsonian Pre-History exhibit.

Here's the results after praying to a demon god and summoning a photographer, who just so happened to be Joe's Dad, who also brought the ring compressor:


Tada!!!! Good eh?


Guinness is the official beer of this build. Bottle dates back to original thread.

Here it is from the bottom. Torque specs for the rod bolts are as follows: 20nm, torque to 50 degree torque angle, same as the mains. Bolts must be oiled and brand new for install, as they are torque to yield.


Head gasket goes on and we torque down the head bolts. They are also brand new as they are torque to yield. Torque to 30nm in sequence per the Bentley manual, then again to 90 degrees, then 90 degrees more.


Head is installed. Now we hook up the timing chain to the exhaust cam.


Unfortunately the chain had a snag that needed some fixing so we had to remove the timing cover, and turn the crank about 5 degrees to slip the kink off of the teeth on the crank. We then turned the crank back. At this point I thanked god that I didn't torque down the big bolt on the crank, and only had it on somewhat hand tight.


Kink fixed!!!


The cam timing was already set to TDC I just wanted to show what the tool looks like. I guess I'm gay like that.


Random porn shot.

[Mr.SWISS]

More.


fapfapfapfapfapfapfapfapfapfapfapfapfapfapfap :hitler:

[SchnellerVert]

That tool works wonders, glad I bought one a few years back from a MAC guy that was closing shop.

[PiercedE30]

Very nice, love being able to watch this build come together.

[KangamangusDriver]

very interesting!!

Ill be looking forward to the progress!

[triggrhaapi]

Thanks for all the kind words guys!!

[FredK]

So, what brand rings were they?

[triggrhaapi]

The wrapping for the rings says "Branorost"
Ein Qualitatsprodukt Von Branspac GMBH

They were like $600 by themselves.

[FredK]

HOLY SCHMOKES! They're probably the genuine BMW pieces, because the dealer charges $600 for the set as well.

Deves are $260 a set, and Schoettle are around $200 a set. Not sure of the quality of Schoettle, but I know Rev Engineer is running Deves rings.