GalantVR4.org The Mitsubishi Galant VR-4 Forum
Galant VR-4 Forums » Galant VR-4 » Technical Discussions » crankshaft strenght?
Previous thread Next thread

crankshaft strenght?


Jesh
Member +
898/1000


Galant VR-4 org Post #: 873045 posted 02/10/10 07:45 PM     Remind Me!  Send Private Message   Edit Post      
whats the most horsepower anyone has heard of 4g63 putting out (reliably) using the stock crankshaft? (i don't care about pistons and rods, i just need to know what the crank can take)



'92 Galant VR4 898/1000
'91 Galant GSX - parts
'93 Laser RS - gone

Posts: 282 | From: Soldotna, Alaska | Member Since: 11/12/09 | IP: (216.67.37.107) | Report this post to a Moderator

Lonewolf64
Obviously the answer is......
889/1000
1247/2000


Galant VR-4 org Post #: 873048 posted 02/10/10 07:52 PM     Remind Me!  Send Private Message   Edit Post      
The crank can handle everything you'll throw at it. It is probably the strongest stock part of the entire engine.



1992 Galant VR-4 #889
1991 Galant VR-4 #1247
2007 Civic Si DD

Posts: 1197 | From: Birmingham, Alabama | Member Since: 05/18/06 | IP: (141.166.236.124) | Report this post to a Moderator

Jesh
Member +
898/1000


Galant VR-4 org Post #: 873051 posted 02/10/10 07:55 PM     Remind Me!  Send Private Message   Edit Post      
thats what i wanted to know. i've heard of people snapping them with 400awhp and wondered if that was just a fluke.



'92 Galant VR4 898/1000
'91 Galant GSX - parts
'93 Laser RS - gone

Posts: 282 | From: Soldotna, Alaska | Member Since: 11/12/09 | IP: (216.67.37.107) | Report this post to a Moderator

1941Galant
Will fight mice for food
1941/2000


Galant VR-4 org Post #: 873056 posted 02/10/10 08:03 PM     Remind Me!  Send Private Message   Edit Post      
I've never heard of someone snapping a 2.0 crank, but I've seen a few cases where the 2.4 broke.

Posts: 1904 | From: Charles Town, WV | Member Since: 08/21/04 | IP: (70.44.250.205) | Report this post to a Moderator

ryno529
Unregistered


Galant VR-4 org Post #: 873065 posted 02/10/10 08:23 PM     Remind Me!  Send Private Message   Edit Post      
Mike Reichen made 1098 whp in his Evo2 that has a 6bolt in it with a stock crank.

| | | IP: (99.180.193.82) | Report this post to a Moderator

rgeier11
sled driving mullet brain


Galant VR-4 org Post #: 873196 posted 02/11/10 08:26 AM     Remind Me!  Send Private Message   Edit Post      
Like everyone else has said, the 2.0 crank can take anything you throw at it. The 2.4 crank that is used for stroker kits, breaks much easier. I have seen 2 cases where the 2.4 has broken at the #4 rod.



1992 GVR-4 #649/1000 SOLD
1998 3000GT VR4 1of19 in New Zealand Green
1992 TSI AWD

Posts: 726 | From: Chicago Suburbs, IL | Member Since: 09/26/04 | IP: (209.7.13.194) | Report this post to a Moderator

blue642
Unregistered


Galant VR-4 org Post #: 873629 posted 02/12/10 11:03 AM     Remind Me!  Send Private Message   Edit Post      
My neighbor's good friends with John Shepherd and told me a while back that John was still running stock crank all the way into the 8s (switched to eagle 4340 crank now). You ain't gonna break one.

| | | IP: (147.185.160.242) | Report this post to a Moderator

punisher
Member +


Galant VR-4 org Post #: 874062 posted 02/13/10 10:35 PM     Remind Me!  Send Private Message   Edit Post      
The only reason I have heard of people snapping them is by not running a harmonic dampener.



-Matt
1992 Talon Tsi awd - DD
1991 Eclipse GSX - project

Posts: 284 | From: Chandler, AZ | Member Since: 08/13/06 | IP: (70.176.32.33) | Report this post to a Moderator

RedTwo
Rangi Kiwi


Galant VR-4 org Post #: 874072 posted 02/13/10 11:13 PM     Remind Me!  Send Private Message   Edit Post      
7 bolts love to crack

Posts: 1917 | From: New Zealand | Member Since: 07/16/08 | IP: (121.73.221.247) | Report this post to a Moderator

holeshotmoe
subclass marmoreus


Galant VR-4 org Post #: 1044915 posted 01/10/12 05:13 PM     Remind Me!  Send Private Message   Edit Post      
Reviving this. Came across this thread while searching to find out how I broke a crankshaft, at #2 rod. I didn't build it but I don't think it's a 2.4 crank. Can anyone ID by the casting numbers?






Posts: 1274 | From: MD | Member Since: 04/07/05 | IP: (50.78.76.180) | Report this post to a Moderator

fuel
"Just to be pedantic!"


Galant VR-4 org Post #: 1044933 posted 01/10/12 06:51 PM     Remind Me!  Send Private Message   Edit Post      
6 bolt or 7 bolt?

4G63 2.0 has a 88mm stroke while 4G64 2.4 has a 100mm stroke - surely you would know if your engine had a displacement of over 2L or not. You can measure the stroke by measuring the distance from the center of the crank to the center of the rod journal - will be 44mm for 2.0 and 50mm for 2.4 (ie half the stroke).



'91 E39A Galant VR-4 Evolution | '80 A164A Eterna GSR Turbo

-- Visit my JDM Galant VR-4 info & specifications site here! --

Posts: 2161 | From: Toronto, ON, Canada | Member Since: 02/23/09 | IP: (211.31.27.142) | Report this post to a Moderator

holeshotmoe
subclass marmoreus


Galant VR-4 org Post #: 1045057 posted 01/11/12 10:00 AM     Remind Me!  Send Private Message   Edit Post      
It's a 6 bolt, and I'm pretty certain it's not a stroker. but will measure the throw tonight. Was operating about 3500 rpm when it started knocking. Shut it off right away so it didn't have time to eat through the bearing. The rod is fine. Thus, I think it must have been cracked and finally just gave up. Luckily when not under heavy load. Just want to make sure I replace with the correct crank, so was wondering if casting markings or other characteristics could be used to quickly identify potential replacements. Anyone know?



Done there, been that

Posts: 1274 | From: MD | Member Since: 04/07/05 | IP: (50.78.76.180) | Report this post to a Moderator

Justin
Unregistered


Galant VR-4 org Post #: 1045072 posted 01/11/12 11:42 AM     Remind Me!  Send Private Message   Edit Post      
The 1357 looks like a job # / repair # that a machine shop might have stamped into it. I could be wrong, but the way that each number is incomplete makes it look like it was stamped by hand.

| | | IP: (208.54.38.130) | Report this post to a Moderator

misfitsnemesis
Junior Member
602/2000


Galant VR-4 org Post #: 1045095 posted 01/11/12 02:00 PM     Remind Me!  Send Private Message   Edit Post      
Yeah stock crank will hold like has been stated already.

Posts: 72 | From: bristol TN | Member Since: 02/22/06 | IP: (97.89.57.223) | Report this post to a Moderator

Barnes
Firechicken
908/1000
237/2000


Galant VR-4 org Post #: 1045096 posted 01/11/12 02:19 PM     Remind Me!  Send Private Message   Edit Post      
Holeshotmoe, were you running a solid crank pulley by any chance?



-Jon Barnes
#580/2000 (Long Gone)
#908/1000 Black (Sold)
#237/2000 White

Posts: 6249 | From: Richland, WA | Member Since: 02/09/03 | IP: (160.84.254.241) | Report this post to a Moderator

holeshotmoe
subclass marmoreus


Galant VR-4 org Post #: 1045286 posted 01/12/12 08:33 PM     Remind Me!  Send Private Message   Edit Post      
Confirmed it's stock...measured 44 mm main center to rod center.
*mains are all about 56.52 mm...the manual specs list 56.68 - 57 mm
*rod journals are all about 44.52...spec dimensions are 44.98 - 45 mm
I was wondering if it has been turned, perhaps resulting in the nitriding being removed and weakening it. It doesn't seem like there is much material missing from the specs, but I don't know what might be typical of normal wear vs commonly removed by machining. It had a stock crank pulley and flywheel. I did notice another marking on the piece as seen below

But again, I would like to know if one can tell from the castings what engine it originated. I'm asking because I found on the web different part numbers for several 2L turbo motors.

Posts: 1274 | From: MD | Member Since: 04/07/05 | IP: (174.54.90.185) | Report this post to a Moderator

grocery_getter
Senior Crab
836/2000


Galant VR-4 org Post #: 1045314 posted 01/12/12 10:59 PM     Remind Me!  Send Private Message   Edit Post      
Machining is usually done in the multiple of 10 thousandth of about .25mm at a time. Your main journals seem like they were machined one time, and the rod journals were machined twice. If you still have the main and rod bearings, you can also look at the back of the bearing shell for an indicator of bearing size. If you see STD, it means standard size, then there is .25, .50, .75 and 1.0 for undersized choices. All in mm.



Andre
836/2000
PINA MOTORSPORTS
Facebook page

Posts: 1225 | From: Kent - industrial suburbs of S... | Member Since: 06/20/04 | IP: (76.121.219.143) | Report this post to a Moderator

Justin
Unregistered


Galant VR-4 org Post #: 1045545 posted 01/14/12 06:17 PM     Remind Me!  Send Private Message   Edit Post   
Quoting holeshotmoe:

Confirmed it's stock...measured 44 mm main center to rod center.
*mains are all about 56.52 mm...the manual specs list 56.68 - 57 mm
*rod journals are all about 44.52...spec dimensions are 44.98 - 45 mm
I was wondering if it has been turned, perhaps resulting in the nitriding being removed and weakening it. It doesn't seem like there is much material missing from the specs, but I don't know what might be typical of normal wear vs commonly removed by machining. It had a stock crank pulley and flywheel. I did notice another marking on the piece as seen below

But again, I would like to know if one can tell from the castings what engine it originated. I'm asking because I found on the web different part numbers for several 2L turbo motors.




In this picture the crankshaft guy at the machine shop has noted that both the rods and mains have been undercut by .50 mm. This type of marking is fairly common among rebuilders, although there are variations. My crankshaft had RODS - Std written above MAINS - Std on a counterweight just like yours. Std = standard size, as was mentioned above.

On cranks that are nitrided, the process is only effective on the the first .020" to .025". That means that by having a .50 mm undercut, the machine shop has removed that nitriding completely, or left only a few thousands of an inch. This is likely the reason that your crank broke.

| | | IP: (208.54.38.240) | Report this post to a Moderator


Pages: 1
Previous thread Next thread

Extra information
0 registered and 19 anonymous users are browsing this forum.

Galant VR4.org Moderator:  curtis, steve, atc250r, jcgalntvr4-244, cheekychimp, jepherz, Rausch, toybreaker, iceman69510, pot, FlyingEagle 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled

Rating:
Thread views: 5083

Rate this thread


News & Events: News | Events
Galant VR-4: Newbies | General VR4 Discussions | Technical Discussions | How To and Info Archive
Marketplace: Parts For Sale | Cars For Sale | Good Guys | Bad Guys
Community: Members' Showcase

Contact Us | Privacy statement GalantVR-4.org

Generated in 0.08 seconds in which 0.056 seconds were spent on a total of 14 queries. Turbo powered.


Hertz's Galant VR-4 Page