Solved Crank Walk on 7-bolts? BS?...

[Morphius]

Some of you 7bolt 2g guys might find this interesting. I talked to a gentlman out of New York, whom I purchased some engine components for my 4D65 project. He specializing in the 4G63 and A520/A853(neon) engines. Mainly buildup, but does a number of different things including nitriding cranks. Anyhow, for those intersted he has a fix for crankwalk, which he is getting a patent for. I thought I might share the information. Save some of you the hassle of doing a 6 bolt swap, while allowing you to keep your 2g rods!!


Below is a pic of an example modified thrust bearing/main cap.


Contact info:
Mark Darius
Dirossi Engine Corp.
toll free: 1.866.364.4630
tel: 518.638.5570
fax: 518.638.5437
[email protected]

He also has a web site under work at: www.overbore.com

He's got some great deals on limited engine parts (ie gaskets, oil pump assy, bearings, etc) He's just getting into the parts arena as they intitially specialized in engine buildup. They can do any machine prep, including nitriding the crank. Good prices on that also. Great guy. Highly recommended.

 

[Black95TSIawd]

get him to post his results and how he did it on here or get it from him. till then i'm waving the BS flag way up there.

 

[Mirage2LTurbo]

I hope the patent is pending, because I'm filing using your design tomorrow morning. Thanks

 

[Morphius]

I hope the patent is pending, because I'm filing using your design tomorrow morning. Thanks

It's Mark's design and it's long ago been filed. I wasn't given any details on status. He's 100 steps ahead of you guys.

 

[Staytuned]

Damn it I was so close too. Good work lets hope the testing reveals some positive results.

 

[Morphius]

get him to post his results and how he did it on here or get it from him. till then i'm waving the BS flag way up there.

Thrust load area is increased on the order of 4 fold or more compared to OEM specs. Call him tomorrow and discuss it with him. You'd have to ask him about who's running the mods and how many miles it's shown to be good for.

He's a fellow DSMer. If I recall, he has a 98 GSX that he runs.

 

[Morphius]

You'll have to pardon the website as it's in it's infancy stage and is in development.

 

[Musashi450]

ahhh watch that skeptisism fly!
In all honesty, if their was ever a fix for our 2g shitsubishi's, the person does stand to make one hell of a profit from the DSM community. I don't care who comes up with the fix as long as their eventually IS a definitive fix for this problem. Unfortunately even if a crankwalk fix was developed now, we would have to wait a pretty long while before any really reliable data came back. Their are plenty of crankwalk "preventatives" but still no fix all magic product, so its of course, understandable why people jump on this and call BS right away. Still, it would be nice......

Edit: I'm going through the website right now. Man he's pretty confident about this being fixed.

"Here’s some examples of the problems we have resolved over the past decade.

2.0L Mitsubishi crank walk – SOLVED
3.0L Toyota head gasket problems – SOLVED
3.2 & 3.5L Isuzu crank shaft rod failure - SOLVED"

 

[lambertvr4]

With his solution, what is he presuming as the reason for crankwalk? And how does his solution fix that problem?

Sure would be nice to have 2G motors to play with too.

 

[Morphius]

With his solution, what is he presuming as the reason for crankwalk? And how does his solution fix that problem?

Sure would be nice to have 2G motors to play with too.

I can't speak for him or the reasoning behind his fix. Or how it's validated.

Just thought I'd pass along the contact info that many of you might appreciate. Who knows, maybe he has a 2g car with the fix that's got 200K miles on it. Or 5 seasons of drag racing. etc. Legit, honest guy. Sounded highly knowledgeable on it, with a shop that's been around a long time.

I speculate there's a warrenty on it also.

 

[Baron4406]

The best theory I heard was from Magnus, they thought since the oil squirters were so poorly designed/placed on a 2g it ended up starving the crank for oil ............something like that. Its written up on their website. Anyway this fix seems like a band aid, however if that band aid works there are gonna be alot of happy 2g guys.

 

[gimmie11s]

why is this just coming to surface now?

Is it fairly new?

 

[Morphius]

The best theory I heard was from Magnus, they thought since the oil squirters were so poorly designed/placed on a 2g it ended up starving the crank for oil ............something like that. Its written up on their website.

I question that. If it was poorly designed/placed oil squirters, then why doesn't the 1g NT fail in a similar fashion? No oil squirters at all. Or how about 2g NT 2.4L motors. Similiar situation as the 1G NT. Granted it's not turbocharged, but for a stock 2g car, it can't run high boost, so it's not really taxing the engine hard, yet they still fail in this condition.

 

[97TSIAWD]

ahhh watch that skeptisism fly!
In all honesty, if their was ever a fix for our 2g shitsubishi's, the person does stand to make one hell of a profit from the DSM community. I don't care who comes up with the fix as long as their eventually IS a definitive fix for this problem. Unfortunately even if a crankwalk fix was developed now, we would have to wait a pretty long while before any really reliable data came back. Their are plenty of crankwalk "preventatives" but still no fix all magic product, so its of course, understandable why people jump on this and call BS right away. Still, it would be nice......

Edit: I'm going through the website right now. Man he's pretty confident about this being fixed.

"Here’s some examples of the problems we have resolved over the past decade.

2.0L Mitsubishi crank walk – SOLVED
3.0L Toyota head gasket problems – SOLVED
3.2 & 3.5L Isuzu crank shaft rod failure - SOLVED"

So he is acredited? If I search for these other vehicles his name/product will come up as a definate fix? Last time one of these guys posted I chewed him out. Ends up 6 months later he was as stupid as everyone else and it didn't work. The proof will show itself, the claims have been made since 97, if there is a fix don't post until it is proven. Many people have been suckered into buying a lie before. I also would have too say that no other manufacturer or car company (mitsubishi) has come up with a fix for such problem. If your friend has done so, he will go down in automobile history, and is probably a very smart person.

 

[GPTourer]

I also would have too say that no other manufacturer or car company (mitsubishi) has come up with a fix for such problem.

I would say they have. Under every Evo 8 hood is a seven bolt that doesn't walk (hasn't walked yet). Why would they bother worrying about making a fix for us when all of our cars are out of warranty; when they are strapped for cash; and most of the people that "discover" the problem are modded anyway? Mitsubishi has moved on to a better engine that they've supplied for their newer cars.

 

[97TSIAWD]

I question that. If it was poorly designed/placed oil squirters, then why doesn't the 1g NT fail in a similar fashion? No oil squirters at all. Or how about 2g NT 2.4L motors. Similiar situation as the 1G NT. Granted it's not turbocharged, but for a stock 2g car, it can't run high boost, so it's not really taxing the engine hard, yet they still fail in this condition.

It makes a lot of sense. A NT car doesn't have the pressure on the crank as a turbo car does. The crank spins around in oil and causes the oil to spin around with it lubricating the bearings. In a turbo car the forces of course are more, so an oil journal is placed in the bearing allowing more oil to flow in, by pressure of the crank. If that oil journal gets clogged and the journal becomes dry enough the crank will begin to walk. A crank initially starts to walk upon a cars startup because the bearings are either dry or nearly dry from sitting, of course not nearly as drastic as in a crankwalked car.

 

[Morphius]

if there is a fix don't post until it is proven.

Maybe it is. All you doubters, call him. Cripes. All of you that have researched this topic, day in and day out. Please post all the solutions that have been done. Let's see them. Logically, what he's done, makes sense.

I also would have too say that no other manufacturer or car company (mitsubishi) has come up with a fix for such problem.

Proof? Maybe they have, and would rather pay for warrenty than stick the extra money into each motor that goes down the line. If you can't conceive how that could be, then you'll never start to understand the auto industry.

It's kinda like the T-case recall. The AWD's were such low volume, Mitsubishi likely decided to just pay for the warrenty or recall cost, than redesign and retool a new t-case and yoke. HUGE cost to do that.

If your friend has done so, he will go down in automobile history, and is probably a very smart person.

He's simply a fellow DSMer, that runs a engine build buisness that sounded pretty knowledgable about this topic. I didn't dive into it. I'm a 1G guy. I mearly purchased some engine parts at an incredible price. I didn't find out about thier machine capability until I called about the parts.

 

[97TSIAWD]

I would say they have. Under every Evo 8 hood is a seven bolt that doesn't walk (hasn't walked yet). Why would they bother worrying about making a fix for us when all of our cars are out of warranty; when they are strapped for cash; and most of the people that "discover" the problem are modded anyway? Mitsubishi has moved on to a better engine that they've supplied for their newer cars.

Because they have already voided it from warrenty, they could sell it seperately as an aftermarket part. Why would they keep it from the consumer if it could make them money? Is it cost affective, maybe not. Also redesigning the 4g63 as was done I imagine for the Evo8 as it is not the same engine in a 2g they might have fixed the problem by starting over. The engine although similar is variably different. Therefore saying that an Evo8 has a fixed 2g motor that will not crankwalk is not true.

 

[Morphius]

It makes a lot of sense. A NT car doesn't have the pressure on the crank as a turbo car does. The crank spins around in oil and causes the oil to spin around with it lubricating the bearings. In a turbo car the forces of course are more, so an oil journal is placed in the bearing allowing more oil to flow in, by pressure of the crank. If that oil journal gets clogged and the journal becomes dry enough the crank will begin to walk. A crank initially starts to walk upon a cars startup because the bearings are either dry or nearly dry from sitting, of course not nearly as drastic as in a crankwalked car.

Oil squirters are for cooling piston skirts/lower cylinder walls. If anything, the squirters are robbing the main journals and rods of oil.

They have common oil galleries and journals.


What's the difference in thrust bearing surface area between 1g and 2g blocks?

 

[97TSIAWD]

Maybe it is. All you doubters, call him. Cripes. All of you that have researched this topic, day in and day out. Please post all the solutions that have been done. Let's see them. Logically, what he's done, makes sense.




Proof? Maybe they have, and would rather pay for warrenty than stick the extra money into each motor that goes down the line. If you can't conceive how that could be, then you'll never start to understand the auto industry.

It's kinda like the T-case recall. The AWD's were such low volume, Mitsubishi likely decided to just pay for the warrenty or recall cost, than redesign and retool a new t-case and yoke. HUGE cost to do that.




He's simply a fellow DSMer, that runs a engine build buisness that sounded pretty knowledgable about this topic. I didn't dive into it. I'm a 1G guy. I mearly purchased some engine parts at an incredible price. I didn't find out about thier machine capability until I called about the parts.

Logically what he has done makes sense? I haven't seen any proof of this. Just by changing some parts around doesn't mean it cures crankwalk. To buy parts and put them in your car thinking it cures crankwalk is all good, but how do I know 10K miles down the road it isn't going to walk? You see you can't have immediate proof so to say it works is a lie. Unless he fixed the problem years ago and has been doing tests since then there isn't proof. Also yes it has been discused as not being cost affective for mistu, but why not sell to the consumer. You seem more like a person plugging a friend/engine builder then anything else. If this is a cure, it will come out in due time. I would also like you to post the logic that seems to make sense, it doesn't seem like a fix to me only a hypothesis. I can get a patent for the ab burner, doesn't mean it has to work.

 

[silkcity100]

the reason we 2g guys have crankwalk is because f`in mitsubishi engineers decided to make the bearing not as wide as the 1g cause less friction would free up more horsepower if you look at 1g and 2g bearing they are like 30percent wider on 1g`s and anyone with any knowledge know wider bearing can withstand more abuse from higher boost levels which then mitsu guys didnt factor in or even think about what would happen if we pushed 25lbs of boost instead of 15,so if this guy in ny created bearings that are as wide as the 1g`s then he may have something but you will have to machine your whole short block so would you rather spend the same amount of money on a tried n tested 6 bolt sway or be a test dummy and keep ur 7bolt your choice,my choice was a race built 6bolt 20 over wiseco with eagles and clevites and balanced all for 1200 shipped fedex express

 

[Morphius]

Logically what he has done makes sense? I haven't seen any proof of this.

I repeat: CALL HIM

You see you can't have immediate proof so to say it works is a lie.

Frankly, I don't have to prove anything. Why do you think I posted his contact info. I'll say it REAL slow....... CALL HIM.

I would also like you to post the logic that seems to make sense, it doesn't seem like a fix to me only a hypothesis.

I forward you to the post that was just made before this one.

 

[Morphius]

the reason we 2g guys have crankwalk is because f`in mitsubishi engineers decided to make the bearing not as wide as the 1g cause less friction would free up more horsepower if you look at 1g and 2g bearing they are like 30percent wider on 1g`s and anyone with any knowledge know wider bearing can withstand more abuse from higher boost levels....

And the logic behind it, explained.

 

[RamenPride]

if you look at 1g and 2g bearing they are like 30percent wider on 1g`s and anyone with any knowledge know wider bearing can withstand more abuse from higher boost levels which then mitsu guys didnt factor in or even think about what would happen if we pushed 25lbs of boost instead of 15

but that doesn't really explain why completely stock cars have walked also

 

[FireyIce01]

Because they have already voided it from warrenty, they could sell it seperately as an aftermarket part. Why would they keep it from the consumer if it could make them money? Is it cost affective, maybe not. Also redesigning the 4g63 as was done I imagine for the Evo8 as it is not the same engine in a 2g they might have fixed the problem by starting over. The engine although similar is variably different. Therefore saying that an Evo8 has a fixed 2g motor that will not crankwalk is not true.

Who's to say that mitsubishi's fix wasn't to just change the block slightly? Who are any of us to say there's not more than one way to solve this problem? Just because it's not the manufacturer's way (they changed parts of the design of their engine, obviously, as evo's don't seem to walk) doesn't mean it's not a viable fix... I'd be interested to see, but I really hate to see the skepticism I see from the DSM community about ANYTHING that isn't proven... how can it be new if it's been proven?