Fixed my boost issue.....but spun a bearing this morning

[Chris@Rvengeperformance]

I mean really? It sounds like a coincidence to you that he tries and tries for more boost (ramming into the aem boost limiter), raises the boost limit, raises the boost 5 PSI and then it blows up?

I'm very sorry Mike, this is nothing against you at all, but it is not unreasonable to think the tune was not ironed out above that boost limiter and something went wrong above that. Obviously I can't say 100% and it may even be too early to know 100% there is a bottom end problem, but if there is I would suspect the tune first, since like you said you've been beating this engine for years, it shouldn 't be a normal mechanical failure.

[Jeff V.]

I went through two engines with spun bearings in my old blue Stealth. You let the car sit for a few hours or a day, and the metal shavings sink to the bottom of the sump. Since the drain plug is not the lowest part on the pan, the metal stays in there when you drain the oil. You don't need a masters degree in building internet racecars to understand simple f'ing gravity.

Now I can sit back and wait for Sin to make a thread asking everyone for the best way to drop his oil pan. Everything else on his car has been 'crowdsourced'. Why stop now?

[familyMAN]

^"like" from phone

[AdamVR4]

Now I can sit back and wait for Sin to make a thread asking everyone for the best way to drop his oil pan. Everything else on his car has been 'crowdsourced'. Why stop now?

That's a little harsh. I make threads for damn near everything too I think his only mistake was going with the AEM EMS...

[Sin'sVr4]

Now I can sit back and wait for Sin to make a thread asking everyone for the best way to drop his oil pan. Everything else on his car has been 'crowdsourced'. Why stop now?

Ok......? I can take out my tranny and my whole rear end, axles heads what ever. Maybe I will start a new thread lol. I will pull the pan maybe tomm. In Denver today going to rockies pirates game. I'm pretty confident its a spun bearing. I haven't changed my tune, fuel pressure or anything. The car was tuned on 26psi. He said he turned the boost down to be conservative, didn't know he turned down the fuel cut load. Oh well. We will see whatys u

[AdamVR4]

In Denver today going to rockies pirates game.

That sounds fun... Especially since the Pirates have the 2nd best record in baseball (1/2 game behind the Braves). When I spun a bearing in my SL, I couldn't find metal in the oil, but it was nasty in the pan. Throw a stock shorty in there on the cheap and be content with 600 awhp

[TurboSinceBirth]

Do you happen to know what your oil pressure was before and after the sound? That's a good indication if you're tolerances opened up causing less of a restriction when you're doing so under conditions that would rule out oil thinning out due to extreme heat.

[J. Fast]

Uh, the tune can certainly pound out bearings in a hurry. If you don't know that you shouldn't be tuning or giving advice.


Sent from my RM-845_nam_vzw_100 using Tapatalk

I keep hearing this "pounding out bearings" phrase, what does that mean?.

[anyonebutme]

I keep hearing this "pounding out bearings" phrase, what does that mean?.

This, this is what it means:



Notice how "fat" the bearing is, that's because the crank hammered it until it squeezed out the sides. that's the laymen's explanation, the real answer is the load surface is too small for the film to support the force hydro-dynamically due to impulses that exceed the wedge's load bearing capability.

{edit]: BTW, that is a center lower main, and no, it did not spin.

[J. Fast]

Is that not caused from an oil hemorrhaging issue? Stock motors hemorrhage oil under 3000rpms at the mains and the oil films are uneven journal to journal. We clearance and balance tighter with aftermarket rotating assembly components to compensate for that very issue. If cut, bob weighted, clearanced, balanced, and assembled correctly I'm of the opinion you don't "pound the bearings out" because they to an extent "float" and remain protected by a uniform film. When bearings deform like that it's because there's a hot spot on the bearing from non uniform oil film thickness. Race engines shouldn't do that. Stock engines, I can see that happening because they hemorrhage oil at low rpms because their clearances can be a little loose and the galleys have casting imperfections.