Blasphemy101's Turbo 24v Build Thread

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Re: Blasphemy101's Turbo 24v Build Thread

Postby M20_fever » Tue Aug 18, 2015 1:50 pm

Aren't the rod bolts TTY?
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Re: Blasphemy101's Turbo 24v Build Thread

Postby Yoshi » Tue Aug 18, 2015 2:38 pm

Yes they are
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Re: Blasphemy101's Turbo 24v Build Thread

Postby M20_fever » Tue Aug 18, 2015 5:14 pm

probably don't want to list those as optional then.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby blasphemy101 » Tue Aug 18, 2015 8:00 pm

M20_fever wrote:probably don't want to list those as optional then.


I only removed one piston. Obviously, I need 2, but they're like 9 dollars a piece, so opting out of the bearing replacement would save ~$150. I'm about to sit down and plastigage it though, so we'll know soon enough!
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Re: Blasphemy101's Turbo 24v Build Thread

Postby blasphemy101 » Wed Aug 19, 2015 5:54 am

Checked out the rod bearing on the rod I pulled. The wear pattern looks perfectly normal to me. I'm having trouble getting the piston back in the bore, but once I do, I'll know more...


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Re: Blasphemy101's Turbo 24v Build Thread

Postby Yoshi » Wed Aug 19, 2015 12:06 pm

That first pic is normal? I thought it should be even.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby M20_fever » Wed Aug 19, 2015 1:55 pm

grr, can't see photobucket pics at work...
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Re: Blasphemy101's Turbo 24v Build Thread

Postby blasphemy101 » Wed Aug 19, 2015 2:51 pm

Yoshi wrote:That first pic is normal? I thought it should be even.


Are you talking about the light patch covering most of the upper half, or the slightly darker part in the middle?

From what I can tell online, the large light patch is normal, I don't know about that bit in the centet, though. They're going to get replaced, though. It would be stupid not to replace bearings I know are well worn.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby Yoshi » Wed Aug 19, 2015 4:23 pm

I just recall all of my previous bearings being uniform all around. Seems odd that different sections have different colors.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby blasphemy101 » Wed Aug 19, 2015 6:25 pm

Yoshi wrote:I just recall all of my previous bearings being uniform all around. Seems odd that different sections have different colors.


The color isn't really that much different, I just chose a picture that really emphasized it. There's definitely no copper showing or anything like that. The bearing is also completely smooth to the touch. I'm just going based on these guides like this:

http://www.wilmink.nl/Clevite/Clevite_lagerschade_tech_info.pdf

http://www.advantageengineparts.com/pdfs/Bearingfailure.pdf

Any rod bearings I've pulled in the past have all been after failure, so I don't have any personal experience in this regard. I believe the difference in wear between the top and bottom halves is due to the higher loading on the combustion stroke.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby blasphemy101 » Wed Jan 13, 2016 3:33 pm

Wow - this thing still isn't done -.-

School and life kind of took over these last few months. But now I have lots of time to put into getting my E30 back together while I search for a job.

I got the bottom end buttoned up with new bearings and installed the new headgasket. I still need to order a couple of things and weld the oil pump nut and ad a oil return fitting onto the oil pan, then the bottom end will be done.
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As I was installing the cam trays, I felt a disturbance in the force. Checking over them again, I came across this beauty...
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I spent the next couple of days scouring pick-n-pull yards for M5x powered cars, looking for a new cam tray. I quickly learned the cam journals are one of the best ways to easily determine the physical health of a M5x motor. The cam trays themselves have lots of edges where oil sludge will build up over long intervals between oil changes, and the aluminum journals wear very badly if there are any oiling problems like low pressure or debris. I pulled apart 6 or 7 heads before I found a cam tray in good shape.

I'm currently on the lookout for M54B30 and M50NV intake cams. There are plenty of M54B30 cams on Ebay, but I'm wary of ordering one, because some parts exchanges seem to show M52TU, M54B25, and M54B30 cams as interchangeable.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby M20_fever » Wed Jan 13, 2016 8:42 pm

I can relate to the never ending project...glad to see you're getting back to it, though looking for a job doesn't sound fun.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby blasphemy101 » Wed Jan 13, 2016 10:44 pm

M20_fever wrote:I can relate to the never ending project...glad to see you're getting back to it, though looking for a job doesn't sound fun.


My goal was to find something powertrain or drivetrain related in the automotive industry, but nothing has really panned out. I've had some promising local interviews, though.

It's nice getting some work done on the car, though. I can't wait to hear it start up.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby Yoshi » Thu Jan 14, 2016 2:35 pm

Cams are such a pain with these motors. Why can't you just replace the damn bearings?! Fuck you bmw!
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Re: Blasphemy101's Turbo 24v Build Thread

Postby blasphemy101 » Thu Jan 14, 2016 2:44 pm

Yoshi wrote:Cams are such a pain with these motors. Why can't you just replace the damn bearings?! Fuck you bmw!


Yeah, it's an interesting choice to have the cam riding on the bare aluminum cap. Like I said, almost every motor I opened up had damaged cam trays. I wonder if it becomes an issue with serious cams and stiffer valve springs.

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