Crankwalk (no shitfight pls)

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JAP63

E III Recaro Pilot
Joined
Oct 9, 2005
Messages
2,073
Location
Gold Coast
Ok, so ive been reading up on the infamous crankwalk and ive got a question.

How many positive cases, and i mean Positive cases of crankwalk have been identified with local motors?, and i dont mean eclipses and talons.

Im getting sick of hearing about crankwalk and i hate being at the mercy of the misinformed interent babbler, one who runs their mout at the first chance from something the read from somewhere, im asking for real and definite cases of local crankwalk that was 100% diagnosed as crankwalk.


Ps-Im sick of hearing regurgitated stories of american/dsm crankwalk, but here is some interesting cases and possibly reasons that could lead us aus owners to be a little more relaxed.

Due to a American safety standards quirk, DSMs had a clutch ignition lock. i.e. you had to clutch-in in order to start the car. If the fundamental cause of crank walk that most people subscribe to is correct (oil starvation at the crank bearings) then doing this (cranking the engine with clutch in before the engine is properly oiled) is a very bad thing. That's the only significant difference AFAIK between the DSM engine and rest-of-the-world cars. I suspect that's the reason why DSMs had so many more problems with crankwalk than everyone else.

The crankwalk problem is not related to the design of the 7-bolt it was due to incorrectly machined cranks on engines manufactured in Illinois. That's why barely any 98-99 2G's suffered from crankwalk as each crank on a 2G has it's own serial number. When you consider how many 7-bolt 2G's were sold, the problem isn't near as widespread as some suggest.

Jamie
 
My original evo2 engine had it pretty bad,the car drove/ran perfectly, it was only when i went to remove the flywheel that i realised that the crank was moving backwards and forwards in the block,i had lots of wear on the crank and on the bearing.block was ok,crank went in the bin though.

i still have the thrust bearing on my desk, i'll put up a pic of it at some stage.
 
VR4 6 bolt engines have not suffered from crankwalk. Its the EVO 7 bolt engines that do and I've witnessed it first hand on cranks I've removed and replaced. We got an EVO 5 crank in to replace my brother's evo crank and the EVO 5 crank was in even worse condition! Do a search in this forum on crankwalk and you'll find pics of the side journal looking like a warped disc brake rotor.
 
:(:(:(. Wow, i cant say my enthusiasm to buy an evo is now the same.

Thanks for the info though, thats what i was after, real cases, not just repeat american stuff.
Surely the problem can not be as wide spread though as what it is in the states, otherwise id be reading every day on theses forums about 7 bolts falling apart!

In saying that, should i not by an evo unless im prepared to rebuild the bottom end?
Is the chance of crankwalk issues lessened if the cars left basically stock?

If im to buy a an evo, what am i to do, should i have the crank end play inspected by a mechanic before i purchase? Will that even be a relevant thing to do....

and
EVO-00X said:
We got an EVO 5 crank in to replace my brother's evo crank and the EVO 5 crank was in even worse condition! .
DOUGMO said:
My original evo2 engine had it pretty bad
Were these motors modified/ high power output and use?

Im thiiiiis close to buying one, every time i do i get friggin scared off with another issue they have.
I dont like the idea of driving around in a nice car, thats well maintained and servicewd wondering when the engine is going to turn to ****!!!!


Jamie
 
chris123 said:
What does starting the car with the clutch in have to do with anything??

When the clutch is depressed, the crank has an axial load applied to it, putting it hard up on the face of the thrust bearings. You then start the car with no oil pressure or circulation yet, as the motor is off. The oil that now begins to circulate can not adequately circualte into these thrust washer areas on the crank because your holding axial load on the crank, preventing the face of the thrust washer from being adequately lubricated

Do this over and over and it may wear more and more, same with always sitting on the clutch at the lights.
 
Intersting, just found a quote from mr Rob Barac himself

"I run and have been running a 7 bolt in my evo3 for 9 years now, I have never experienced crank walk yet and im making plenty of hp too:D

Theres is hope for 7 bolts!
 
That's all good, but irrelevant really. Think of all the things that cause crankwalk, and then think of how much of that applies to Rob's drag car.
 
rob323 said:
That's all good, but irrelevant really. Think of all the things that cause crankwalk, and then think of how much of that applies to Rob's drag car.

fair point i guess

his car makes big power though

but is it even manual anymore?

dont spose he sits on the clutch much either!
 
my car was pretty much stock (pod and cat back,stock boost etc...)and had it pretty bad.

you may be able to see if the crank is moving in and out by watching the balancer and get someone else to depress the clutch,

thats how i noticed it on my mates celica.
 
Thanks for bringing this topic up Jamie, I didn't even know what crankwalk was beforehand. I had always wondered what the clutch had to do with it as well.
Well I'm going to bypass the clutch switch on my hyundai now. Thanks! :)
 
brisvr4 said:
Yep. Series 1 you could actually watch the crank move in and out!

Jeez, did they ever experience engine failure?




MDK87 said:
Thanks for bringing this topic up Jamie, I didn't even know what crankwalk was beforehand. I had always wondered what the clutch had to do with it as well.
Well I'm going to bypass the clutch switch on my hyundai now. Thanks! :)

Yeah mate, im with you on that, im learning heaps too!

PS-Ive put a deposit on an E4, having a compressiont test and crankshaft end float inspection done tommorow, if it passes..im an evo owner!!!
 
JAP63 said:
PS-Ive put a deposit on an E4, having a compressiont test and crankshaft end float inspection done tommorow, if it passes..im an evo owner!!!


WOOHOO!!! The Barina would be a great runabout but I knew you wouldn't be able to hold back from 4G boost! Haha, thats awesome dude. :cool:
 
I took this pic of the EVO 5 crank we were going to swap in for my brother's Evo I crank. When I saw the condition of the side wall of the thrust journal I almost had a heart attack!

Then we brought in an EVO II crank from NZ and it had a very tiny amount of side wall wear but nothing that would have rendered the crank as a boat anchor. The machine shop sorted the EVO II crnak out and it was still good to use.

The truth of the matter is that unfortunately its not only the 7 bolt DSM Eclipse engines that suffer from it, Evo's do too. For a while there I thought it only happened to our US cousins but as more and more people came out with proof of crankwalk in EVO I onwards, and seeing it first hand, you cant help but feel a little dampened by it for all the evo owners out there.

Luckily many of us have a 6-bolt bottom end in our cars and for some reason they are immune to it. There's plenty of theories out there as to why (theres a good write up on it on the Magnus Motorsports website with dissection photographs of the 2 different 4G63 blocks).

thrustjournalmn4.jpg
 
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