Main Bearing Question

[97 Talon Esi]

I Know This Is Not The Right Place To Be Posting This But I Can't Post Where It Is Suppose To Go.I Am Doing A 4G63t Motor Build And I Have A Question About The Main Bearings In The 7-Bolt. I Am Aware That From 92-96.5 They Used Flange Bearings Which I Further Read Could Be The Cause Of The Dreaded CrankWalk. But I Also Know That Mitsubushi Came Out With A Thrust Washer That They Put In The 97-99 Blocks In An Attempt To Prevent CrankWalk. I Heard That The Cases Of Crankwalk Went Down When They Changed The Main Bearings.My Question Is Can I Take My Block Which Has The Flange Bearings And Replace Them With The Thrust Washers Or Is This Not Possible? I Am Just Trying To Piece This Motor Together With The Best Possible Combination Of Parts Thanks For The Help.

 

[Rob10_99]

Ok Edit Your Post So It Doesn't Look Like This.

 

[JEFFREYCASTGSX]

Is this on your N/T? If its not, then let me tell about how overplayed crankwalk is. The ONLY engines that are PRONE to it are the 95-97 and some 98. All 99 have the revised thrust and so do some 98. But there is a fix. You want to know how fix it? Either you swap a 6-bolt, which has a heavier rods (holds crazy power and has seen 140+mph traps, but also causes the engine to rev slower), pistons with lower compression, and a head that flows LESS than the 2g 7-bolt (i could get into great detail with this). Or you can skip that and plug up your oil squirters.

There are also less than 1800 REAL cases of crankwalk, and thats out of 1,100,000 2g dsms produced

 

[97 Talon Esi]

No This Is Not For My N/T. I Am Doing An Engine Build Which I Plan To Drop Into A Shell That I Have. I Know That Crank Walk Is Over Rated. But I Was Just Wondering If I Can Change My Mains With The Revised Thrust Bearings Or Is That Not Possible? I Am Not Gonna Change To A 6-Bolt Seen As I Already Have A 7-Bolt. Plus I Already Have The 6-Bolt Rods Machined Out To Fit My 7-bolt Crank And Pistons. And What Benefits Do I Get If I Plug My Oil Squitters?

 

[JEFFREYCASTGSX]

Benefits:no crankwalk

Your engine already has sguirters, there in the rods.

 

[97 Talon Esi]

The job of the oil squirters is to spray oil onto the underside of each piston as it reachs the bottom of its travel, which provides cooling and lubrication for the blazing-hot pistons. What i am asking is can i change my flange bearings for the crank to the thrust bearings or they are not interchangable.

 

[bryanwheat]

Benefits:no crankwalk

Your engine already has sguirters, there in the rods.

The oil squirters aren't in the rods, they are in the block in the main bearing casting. And to answer your question, no you can't use the later model bearings. There is no revision in the block. I'd just pick up a later model 7 bolt, or a 1g 7 bolt, or even a 6 bolt.

 

[LiquidX]

Is this on your N/T? If its not, then let me tell about how overplayed crankwalk is. The ONLY engines that are PRONE to it are the 95-97 and some 98. All 99 have the revised thrust and so do some 98. But there is a fix. You want to know how fix it? Either you swap a 6-bolt, which has a heavier rods (holds crazy power and has seen 140+mph traps, but also causes the engine to rev slower), pistons with lower compression, and a head that flows LESS than the 2g 7-bolt (i could get into great detail with this). Or you can skip that and plug up your oil squirters.

There are also less than 1800 REAL cases of crankwalk, and thats out of 1,100,000 2g dsms produced

ANY engine can crank walk including 6 bolts, revised 7 bolts, 420a, B16, H22, domestic blocks etc. but the main occurances are the 2Ga motors.

1g head flows MORE however the 2g head has a higher velocity. You can also add a hash mark to the 1800 as my motor walked (2g 7bolt) after a week drive time. It was also a used motor though.

 

[JEFFREYCASTGSX]

The oil squirters aren't in the rods, they are in the block in the main bearing casting. And to answer your question, no you can't use the later model bearings. There is no revision in the block. I'd just pick up a later model 7 bolt, or a 1g 7 bolt, or even a 6 bolt.

Look at the rods, there some in there TOO. Why would he want a inferior motor.

ANY engine can crank walk including 6 bolts, revised 7 bolts, 420a, B16, H22, domestic blocks etc. but the main occurances are the 2Ga motors.

1g head flows MORE however the 2g head has a higher velocity. You can also add a hash mark to the 1800 as my motor walked (2g 7bolt) after a week drive time. It was also a used motor though.

A 2g head flows more, plain and simple. Flow is all about velocity, the higher the flow the higher velocity, size has little correlation with flow.

You can add your occurence yourself here http://www.dsmtuners.com/forums/newbie-forum/15307-crankwalk-poll-merged-17.html

 

[sprmotohooligan]

Bringing this back from semi-dead for my $.02.

I remember reading that the 1G head can be ported out bigger then the 2G head, thusly making it better for those super high perf. applications. But the 2G head is better if you aren't porting the f*ck out of it.