EVO4's are they any good
, I have only seen 1 E4 have crank walk, the 4 is still a very good car.
27-08-2008, 05:05 PM
#7
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yeah but its not as big a deal as people seem to make out, its to do with the side to side movement of the crank, it moves this way because the block/bearing design wasnt as good as the later models, so the bearings wear and allow the crank to 'walk' when the clutch is pressed etc. Plenty people running forged early evo's with no problems on the MLR, can presume the engine wont last as long as say an evo 5-9 engine would.
other than that they are a great car that can be picked up for next to fuck all
other than that they are a great car that can be picked up for next to fuck all
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27-08-2008, 05:07 PM
#8
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I'm not any sort of expert but have read things about crank end float something to do with the design of a thrust washer that was changed from 5 +
are they that bad or is it all blown out of proportion as usual
Could be wrong
are they that bad or is it all blown out of proportion as usual
Could be wrong
Last edited by dreamer; 27-08-2008 at 05:08 PM. Reason: probably wrong about this
27-08-2008, 05:15 PM
#9
taken from MLR
A 'walking' crankshaft is a crankshaft that moves too much inside the engine. This is also known as excessive thrust bearing play. The movement is usually due to the crankshaft not fitting inside its bearings correctly. While not bad for the crankshaft, the movement can place excessive or uneven loads on the bearings, causing premature failures.
Many 2G owners have suffered from walking crankshafts. It appears that Mitsubishi built many 2G engines using defective crankshafts, which were machined out of specification and are thus capable of moving around too much inside the block. All 2G model years appear to be affected to some degree.
To fix this problem, Mitsubishi has designed several versions of matching crankshaft bearings. This allows the defective motor to retain the crankshaft, yet matches the bearings correctly so as to eliminate the excessive crankshaft movement. Matching the bearings in this manner is tricky and requires exact information about when the crankshaft was manufactured, which may be determined by color markings on the crankshaft itself. The 2G factory manual includes information on how to match crankshafts to bearings.
1G owners do not generally need to worry, as there are no chronic problems with crankwalk in per-1995 cars. However, it is possible for any engine to experience crankwalk if there is a problem with the crankshaft bearings. It has been reported that 'small rod' / 7-bolt flywheel motors (manufactured from later 1992 through 1994 on 1Gs) are more prone to crankwalk than 'big rod' / 6-bolt flywheel engines (manufactured from 1989 to early 1992). However, there can be no guarantees, since big block V8s and all other engines can also suffer from crankwalk.
It can be difficult to tell if a particular car is experiencing crankwalk. Symptoms are usually indirect and difficult to diagnose until major damage occurs.
Since the clutch places pressure on the crankshaft, many owners have reported clutch or shifting problems associated with the walking crank. Having the clutch 'stick' down on left-hand turns is often a telltale sign of crankwalk. Other symptoms include inconsistent engagement height, poor or rough engagement, difficulty shifting, ticking noises and varying pedal height or pressure. Another possibility is having the engine RPM decrease significantly when the clutch pedal is down.
Another problem with crankwalk is that the crankshaft may move so much as to literally tear up and destroy the 2G crankshaft angle sensor. This problem usually manifests itself as a ticking noise coming from the timing belt area, as the sensor is literally and slowly ground away by the crankshaft. Any such noise should be investigated right away to prevent serious problems.
Unfortunately, cranshaft angle sensor failure usually leads to a replacement sensor, rather than a replacement crankshaft, as mechanics fail to diagnose the underlying problem. 2G owners who have experienced premature failure of the crankshaft angle sensor should investigate the possibility of a walking crankshaft immediately.
A 'walking' crankshaft is a crankshaft that moves too much inside the engine. This is also known as excessive thrust bearing play. The movement is usually due to the crankshaft not fitting inside its bearings correctly. While not bad for the crankshaft, the movement can place excessive or uneven loads on the bearings, causing premature failures.
Many 2G owners have suffered from walking crankshafts. It appears that Mitsubishi built many 2G engines using defective crankshafts, which were machined out of specification and are thus capable of moving around too much inside the block. All 2G model years appear to be affected to some degree.
To fix this problem, Mitsubishi has designed several versions of matching crankshaft bearings. This allows the defective motor to retain the crankshaft, yet matches the bearings correctly so as to eliminate the excessive crankshaft movement. Matching the bearings in this manner is tricky and requires exact information about when the crankshaft was manufactured, which may be determined by color markings on the crankshaft itself. The 2G factory manual includes information on how to match crankshafts to bearings.
1G owners do not generally need to worry, as there are no chronic problems with crankwalk in per-1995 cars. However, it is possible for any engine to experience crankwalk if there is a problem with the crankshaft bearings. It has been reported that 'small rod' / 7-bolt flywheel motors (manufactured from later 1992 through 1994 on 1Gs) are more prone to crankwalk than 'big rod' / 6-bolt flywheel engines (manufactured from 1989 to early 1992). However, there can be no guarantees, since big block V8s and all other engines can also suffer from crankwalk.
It can be difficult to tell if a particular car is experiencing crankwalk. Symptoms are usually indirect and difficult to diagnose until major damage occurs.
Since the clutch places pressure on the crankshaft, many owners have reported clutch or shifting problems associated with the walking crank. Having the clutch 'stick' down on left-hand turns is often a telltale sign of crankwalk. Other symptoms include inconsistent engagement height, poor or rough engagement, difficulty shifting, ticking noises and varying pedal height or pressure. Another possibility is having the engine RPM decrease significantly when the clutch pedal is down.
Another problem with crankwalk is that the crankshaft may move so much as to literally tear up and destroy the 2G crankshaft angle sensor. This problem usually manifests itself as a ticking noise coming from the timing belt area, as the sensor is literally and slowly ground away by the crankshaft. Any such noise should be investigated right away to prevent serious problems.
Unfortunately, cranshaft angle sensor failure usually leads to a replacement sensor, rather than a replacement crankshaft, as mechanics fail to diagnose the underlying problem. 2G owners who have experienced premature failure of the crankshaft angle sensor should investigate the possibility of a walking crankshaft immediately.
27-08-2008, 06:10 PM
#23
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the missus has banged on about having an evo for ages that was until she went in one the other day when she got out her exact words were " im not having one of them there shit!"
28-08-2008, 08:26 PM
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28-08-2008, 08:33 PM
#28
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STOP CALLING IT CRANKWALK.............. Are you americans? It's called Crankshaft end float. Crankwalk makes me think of a stupid fat american person talking through their nostrils. Bloody MLR with all it's US members talking about crankwalk and 'stock' parts and jaywalking and fucking-well color and so on.................
28-08-2008, 08:40 PM
#29
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I bought a evo 6 Ralliart number 61 uk car with 66000miles on the clock, mint inside and out full service history for £8900. Its running 322bhp and i prefer it to my 420hp escort cossie in every way.
Alot of car for little money.
Alot of car for little money.
28-08-2008, 09:08 PM
#31
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I had an evoIV and i have to say it was an awesome car, in nearly every way. It looks better than the 5 and way nicer than the 6 (my opinion)
I had heard about the crank issues, but never came across it (although the car was left largely unmollested - bonnet only came open to change the oil lol)
The drive, seating position, gearchanges were all sweet, perfectly placed, although the car did require 100% concentration while driving - steering was like a go kart, and it tracked the road like it had pritt-stick on the tyres
Launches are awesome (this only had around 300 pones) and the grip given when you floor it through a corner was immense. (all that fancy diff / yaw business)
Apparently the clutches are like fudge though, and cost a fortune to replace when they go.
Here she is / was in all her filthy glory
I had heard about the crank issues, but never came across it (although the car was left largely unmollested - bonnet only came open to change the oil lol)
The drive, seating position, gearchanges were all sweet, perfectly placed, although the car did require 100% concentration while driving - steering was like a go kart, and it tracked the road like it had pritt-stick on the tyres
Launches are awesome (this only had around 300 pones) and the grip given when you floor it through a corner was immense. (all that fancy diff / yaw business)
Apparently the clutches are like fudge though, and cost a fortune to replace when they go.
Here she is / was in all her filthy glory
28-08-2008, 09:19 PM
#32
10K+ Poster!!
when they do go a twin plate clutch is the BEST thing to fit, albeit a tad on the expensive side, but it will take a shitload of abuse
28-08-2008, 09:26 PM
#33
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I had an evoIV and i have to say it was an awesome car, in nearly every way. It looks better than the 5 and way nicer than the 6 (my opinion)
I had heard about the crank issues, but never came across it (although the car was left largely unmollested - bonnet only came open to change the oil lol)
The drive, seating position, gearchanges were all sweet, perfectly placed, although the car did require 100% concentration while driving - steering was like a go kart, and it tracked the road like it had pritt-stick on the tyres
Launches are awesome (this only had around 300 pones) and the grip given when you floor it through a corner was immense. (all that fancy diff / yaw business)
Apparently the clutches are like fudge though, and cost a fortune to replace when they go.
Here she is / was in all her filthy glory
I had heard about the crank issues, but never came across it (although the car was left largely unmollested - bonnet only came open to change the oil lol)
The drive, seating position, gearchanges were all sweet, perfectly placed, although the car did require 100% concentration while driving - steering was like a go kart, and it tracked the road like it had pritt-stick on the tyres
Launches are awesome (this only had around 300 pones) and the grip given when you floor it through a corner was immense. (all that fancy diff / yaw business)
Apparently the clutches are like fudge though, and cost a fortune to replace when they go.
Here she is / was in all her filthy glory
28-08-2008, 10:10 PM
#37
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