Blasphemy101's Turbo 24v Build Thread

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Re: Blasphemy101's Turbo 24v Build Thread

Postby blasphemy101 » Thu Jul 16, 2015 7:16 pm

Yoshi wrote:You're such a cock tease. I need pix son!


Soon. Some flywheel carnage while you wait.

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Re: Blasphemy101's Turbo 24v Build Thread

Postby Yoshi » Fri Jul 17, 2015 12:37 pm

Ah jeez that's bad. I guess you can just screw in a new surface without having to balance it? I never got that when I saw these flywheels.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby blasphemy101 » Fri Jul 17, 2015 6:30 pm

Yeah, there's a little bit of hotspotting on the pressure plate, but I'm going to try running it. There's a lot of life left in the clutch, so I'm not sure what happened. The transmission has a new clutch cylinder, so maybe the old cylinder went bad, but he kept driving on it.

I don't know about the surface - I guess it's possible if the two parts are balanced independently. I'm going to call UUC to discuss it. A new surface is only $100.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby Yoshi » Sat Jul 18, 2015 12:56 am

I don't like using used stuff like that. But it'll work I suppose :)
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Re: Blasphemy101's Turbo 24v Build Thread

Postby blasphemy101 » Sun Jul 19, 2015 5:30 pm

I don't either, but it's a price vs. benefit thing. A new M5 clutch and flywheel is $500+ that could go into the motor for the time being.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby blasphemy101 » Tue Jul 21, 2015 6:22 pm

Some pics as I begin the teardown. - I'm going to finish taking things off the block and maybe even take a look at the valves today.

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A note about this picture: I found a bottle of Shocktop "Shockolate Wheat" in my fridge while I was working. Granted, I'm a girl when it comes to beer, but this has to be some of the worst crap I've ever put in my body. It might just be because it's been in there since the holiday season.

Against Yoshi's recommendation, I've decided to try to track down a set of m42 pistons. The M42 pistons are symmetrically dished, and the combustion chamber on the m42 has a similar shape to the M50, so I think it will be a good combination and an affordable way to lower compression.

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I've found one post online suggesting E30 and E36 M42 pistons are different. At the very list, the diameter of the standard E30 M42 pistons is smaller and identical to the M50TU (83.980 mm). Supposedly the E36 M42 pistons have a shallower dish (~1 mm less) and shorter skirts. I'm not sure which I am going to go with yet. I am getting a set of 4 of each. I will measure them and then decide from there which I will use.

My initial thoughts are that the E30 pistons are more true to the original M50TU pistons, with the same diameter and similar skirt length, but the shallower depth of the E36 pistons will help keep compression up to reasonable levels (~8:1), and the extra skirt length of the E30 pistons might be unnecessary; the M50TU already has a better rod/stroke ratio than the M42. The extra diameter will also help fill out some of the piston-cylinder wall gap created by wear and a light hone.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby blasphemy101 » Tue Jul 21, 2015 6:27 pm

Yoshi wrote:can always get a hone kit and a drill. knock off the rust and pray. It works quite often actually.


Question about this: does a light hone typically increase the bore enough to require new piston rings? Obviously, I can measure the rings when they come out, but i know the bore won't be 100% consistent after the hone, and I obviously can only measure the top of the bore.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby Yoshi » Tue Jul 21, 2015 6:55 pm

nah. honing doesn't bore enough to really change anything. You're just adding back the hatching for the oil to grab onto and knocking off rust in the process.

Think about taking a 1000 grit piece of sand paper to an inch thick piece of metal. It'll takes you a year to even make a dent in it.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby blasphemy101 » Tue Jul 21, 2015 7:43 pm

Yoshi wrote:nah. honing doesn't bore enough to really change anything. You're just adding back the hatching for the oil to grab onto and knocking off rust in the process.

Think about taking a 1000 grit piece of sand paper to an inch thick piece of metal. It'll takes you a year to even make a dent in it.


D'oh. If I had looked at my notes from manufacturing, I wouldn't have had to ask. I was thinking of reaming.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby blasphemy101 » Tue Jul 21, 2015 9:12 pm

Almost everything is off the block now. I think I will have to drain the fluids to take off the rest, so I'm taking a break for a little while. Sorry for the terrible pictures. There isn't a lot of space where I'm working.

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Re: Blasphemy101's Turbo 24v Build Thread

Postby Yoshi » Tue Jul 21, 2015 11:50 pm

aaah the cylinders don't look that bad. run the som bish.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby M20_fever » Wed Jul 22, 2015 2:21 pm

Stupid work filters out photobucket so can't see pics now, but honing won't remove enough material to require new rings. I looked into m42 pistons when I was building my stroker, and the general consensus was don't use them. Not only are they not designed for the head your using, they are more fragile and susceptible to damage from detonation. Take this for what it is as I have no direct experience with them, just read a bunch when building my engine.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby blasphemy101 » Wed Jul 22, 2015 4:27 pm

M20_fever wrote:Stupid work filters out photobucket so can't see pics now, but honing won't remove enough material to require new rings. I looked into m42 pistons when I was building my stroker, and the general consensus was don't use them. Not only are they not designed for the head your using, they are more fragile and susceptible to damage from detonation. Take this for what it is as I have no direct experience with them, just read a bunch when building my engine.


I haven't been able to find a whole lot of information about running them in a 6-cylinder except for some anecdotal stuff in threads on stroker builds. The M42 guys seem to ditch them on their turbo builds, because the profile gasket causes problems with thicker MLS headgaskets. They wind up using new pistons to lower the compression. I'm not trying to argue with your findings - I haven't found evidence one way or the other. If you have links or something, please post them up!

I'm not too worried about the combustion chamber. The combustion chambers of the M50 and M42 are very similar, at least from pictures. The M42 pistons have a symmetrical dome-type dish to them, so they shouldn't be any worse in that regard than aftermarket dished pistons.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby blasphemy101 » Wed Jul 22, 2015 6:05 pm

Yoshi wrote:aaah the cylinders don't look that bad. run the som bish.


They're certainly not pretty, at least when compared to my M20. I'll take some close ups.
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Re: Blasphemy101's Turbo 24v Build Thread

Postby M20_fever » Wed Jul 22, 2015 7:41 pm

Only thread I know it was discussed off hand is my old engine build thread on tech here: http://www.e30tech.com/forum/showthread.php?t=41594

Not sure where it is in there, haven't looked at it in years.
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