Hey I was just daydreaming and i was wondering; if you had a 7 bolt engine and decided to get a 2.3L stroker kit (like this one:http://www.dss-racing.com/product.asp?section=Eclipse_Talon&subname=DSM&productid=32-200-210 ) , which includes internals and a forged crank, would this be a secondary solution to crankwalk as opposed to ding a 6 bolt swap? Just wondering hmm..

Not sure, I guess as long as the oil squirter problem is fixed with the plugs...I mentioned the squirter rumor earlier and no one pounced on it either way, to my surprise. I will say this, though: 2 grand is a helluva gamble when you can get a built 6 bolt for that much....

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Black 98 GST missing her owner and looking for a new one...Inquiries welcome

It has nothing to do with the oil squirters. Let that rumor die.
If it were the oil squirters auto cars would crankwalk too.

It is the force on the crankshaft applied by the clutch and the misaligned/poorly ground bearings that cause crankwalk. I know people who have taken apart crankwalked engines and that was the only problem found.

Well I don't really know. Make sure the journals are ground correctly and get new bearings. I guess it would work fine.

Remember, not all 7 bolts crankwalk, so I am sure it would be okay.

my friend was telling meth eother day his 2001 mustang gt crankwalked

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11.65 @ 115

Crankwalk is just premature bearing failure. Any car can do it.

I would put money on the oil squirters over poor machining. Not that it couldn't be poor machining, but I think if that were the case then crankwalk would be far more common than it actually is. Plus I doubt Mitsubishi would be the only manufacturer to have done a less than perfect job on a block. The oil squiter theory makes more sense, from what I have seen, every block that has them blocked has not had a problem because the bearings get the proper oil pressure for sufficient lubrication. 6-bolts aren't a 100% safe from crankwalk either, I have seen a few 6-bolts that walked too.

Jay Jay the Jet Plane

never ever heard of a 6-bolt walking....and if its the ball style oil squirters, then the 6bolt wouldn't walk b/c it has a different style...

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Black 98 GST missing her owner and looking for a new one...Inquiries welcome

It's running again shitheads.

http://www.dsmregistry.com/detail.php?carid=791

HybriDSM@gmail.com ; HybriDSM@hotmail.com

Think for yourself. Question authority does not always mean disagree with authority.

If life were perfect, I'd be Calvin and you'd be Hobbes.

I think you guys are misinformed...I've personally SEEN 2 6-bolts in the same shop that crankwalked (both with oil squirters). They both happened to make 400+ hp before they did but it happened regardless. The difference is that crankwalk isnt discovered in 6-bolts as often because they dont have a crank angle sensor like the 7-bolts do. As much as I hate to admit it, the 4g64 can walk too. And where did you hear that autos dont crankwalk? Crankwalk is known to happen at any given time throughout the motor life...whether it be at 10k or 150k miles. If you think about it, it makes perfect sense, if it were machining why would the block suddenly let go at 100k? The bearing would have failed LONG before that. It's a gradual process caused by insufficient lubrication of the bearing...since different motors might be supplying the bearings with slightly different oil pressure (very slight difference but thats all that matters), the motors are going to have different failure points. 6-bolts and 4g64's do use a different style of oil squirter too, so they crankwalk quite a bit less than 7-bolts but it still happens. Anyway this thread makes it seem like crankwalk is a plague to DSM's...not the case. The probability of any motor crankwalking is FAR less than people make it out to be.

Jay Jay the Jet Plane

It's running again shitheads.

http://www.dsmregistry.com/detail.php?carid=791

HybriDSM@gmail.com ; HybriDSM@hotmail.com

Think for yourself. Question authority does not always mean disagree with authority.

If life were perfect, I'd be Calvin and you'd be Hobbes.

if it were oil squiters the crank wouldnt walk it would crack in half.

chrysler kid ©

Jay Jay the Jet Plane

Well, I doubt Mitsubishi would have such a sloppy machining process that would slightly alter the clearances from motor to motor, at least to the point where it causes bearing failure. You may be right that they did a less than perfect job but i doubt its any worse than any other manufacturer. The root of the problem lies in the lubrication of the bearing. On all cases of crankwalk the crank bearing is scored and usually even has a little heat discoloration. Thats just inadequate lubrication plain and simple. The reason being is that those squirters rob the bearings of the necessary pressure to supply oil evenly throughout the bearings. Of the two motors I saw, one was stock, the other had 2g pistons and clevette bearings. Clevette makes nice stuff so I doubt it was the bearing's fault. But furthermore both motors still used the oil squirters. The first motor was toast, the other with the clevett bearings was getting re-honed and we noticed scoring in the bearing. It had about .009 clearance i think, not sure off the top of my head. That motor was still able to be fixed. I ran about 360hp through my stock 7-bolt with 60K on it before I took it out and its flawless and i still had the squirters in. Which is sort of my point about some motors getting better lubrication than others simply by the hit and miss nature and random variability of engines. My opinion is that those differences would be irrelevant if the squirters were blocked since it would greatly increase the pressure to the bearings. I have yet to see a motor with the squirters blocked crankwalk.

Jay Jay the Jet Plane

I really hate being on a different computer for the next 3 months because there is a great link floating around about the oil squirter theory. A few people cut a 6 bolt and 7 bolt block in half after takign apart the engines next to each other to try and figure it out. Basically they came up with the oil squirter theory: the 7 bolt uses a ball style squirter while the 6 bolt uses something different. Their theory is that the ball gets clogged and remains always open, leading to low oil pressure conditions, esp. at idle. Then, at idle, you press your clutch in and put pressure on the crank/bearings, but they're in a lean oil condition, creating "heat spots" as someone said above...

I guess that only sort of explains why 2600 lb. pressure plates seem to cause CW more frequently. Another explanation could be mitsu's temperature at measurement/grind...if the ambient temp is off at the factory, it causes measurement/clearance issues, but I think that theory is bunk.

The worst one i've heard to date is "apparently somebody dropped something into the vat when they were molding crankshafts." He probably drove a civic with a muffler.

THe DSM community is ludicrously knowledgable about these cars--i'm curious as to why no one has figured it out yet

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Black 98 GST missing her owner and looking for a new one...Inquiries welcome

^^^^^^^^^^^^^^The link you were referring to is this:

http://www.magnusmotorsports.com/crankwalktheory.htm

I'm leanign towards oil squirter, but am not convinced, but I guess it's a moot point anyway. CW is a few and far between problem, but it's always kinda cool to find out more about it.

Crankwalk is sort of like having mental instability in your family. Very few get it, but every single one worries about it no matter how rare it is.

It's running again shitheads.

http://www.dsmregistry.com/detail.php?carid=791

HybriDSM@gmail.com ; HybriDSM@hotmail.com

Think for yourself. Question authority does not always mean disagree with authority.

If life were perfect, I'd be Calvin and you'd be Hobbes.

______________________________________________________
2003.5 M3
99 M3
99 GST

It's running again shitheads.

http://www.dsmregistry.com/detail.php?carid=791

HybriDSM@gmail.com ; HybriDSM@hotmail.com

Think for yourself. Question authority does not always mean disagree with authority.

If life were perfect, I'd be Calvin and you'd be Hobbes.

thanks for the link hybrid, it was driving me nuts...



i just did my $@#%ing door handle today, talk about a flaw in design that's cheap and easy to change----if mitsu didn't bother fixing that, why would they put in new thrust bearings, esp on the last model year of a car? That theory has gotta be bunk.

I do like the family mental patient analogy though, its fitting....

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Black 98 GST missing her owner and looking for a new one...Inquiries welcome

It's running again shitheads.

http://www.dsmregistry.com/detail.php?carid=791

HybriDSM@gmail.com ; HybriDSM@hotmail.com

Think for yourself. Question authority does not always mean disagree with authority.

If life were perfect, I'd be Calvin and you'd be Hobbes.

since we're talking about CW. i always wanted to know. why is it that only dsm is more likey to get cw but the lancer evolution 1-3 isn't. isn't the motor basiclly setup the same way...

My crankwalk question:
I have a 7bolt ATX that's not going to be torn down or swapped anytime soon.
No signs of CW at 90k. Would it benefit me at all to drop the oil pan and
1) Replace all the bearings?
2) Remove the oilsquirters and screw a bolt with red loctite into the hole to block them off?

Jay Jay the Jet Plane

good question

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Black 98 GST missing her owner and looking for a new one...Inquiries welcome