rod bearing clearances, need help! - EvolutionM - Mitsubishi Lancer and Lancer Evolution Community



Evo Engine / Turbo / Drivetrain Everything from engine management to the best clutch and flywheel.

rod bearing clearances, need help!

Reply
 
 
 
Thread Tools Search this Thread
Old Nov 24, 2016, 02:59 AM   #1
Evolving Member
Thread Starter
 
Join Date: Aug 2011
Location: somewhere
Posts: 477
Thanks: 0
Thanked 0 Times in 0 Posts

Drives: evo 8 gsr

rod bearing clearances, need help!

i need advice on rod bearing oil clearance, i have a stock 4g63 crank which spun a bearing.

now after polishing it and with new standard size ACL bearings the clearence is .003

is this fine or should it be tighter? can i run the car like this or do i need to cut the crank and get oversize bearings.

i really hope i can get away with this clearence, what do you guys think?
Offline
 
Reply With Quote
Old Nov 24, 2016, 08:44 AM   #2
Evolving Member
iTrader: (1)
 
roni4g63's Avatar
 
Join Date: Jul 2015
Location: Sun Valley,CA
Posts: 343
Thanks: 0
Thanked 10 Times in 10 Posts

Drives: '03 Apexi Silver Evo VIII

He bud, I just finished my build, so I know the feeling! Truth is you will get many answers. Even though it will be in the same ballpark of clearences, you need to determine that cars use and ultimately your ideal clearence.

few questions for ya, are you using an outside micrometer for the journals and a dial bore gauge for the rods with bearings installed? Or are you doing the plastigauge old school way?

On my setup, I ended up with 0.0022-0.0024" on my mains, and 0.0026" on all my rods, i used king xp series bearings and hd a brand new billet uncut crank. All my main journals measured out to 2.2437" and my rod journals about 1.7731" or so (off top of my head)

anyway I would personally say 0.003" is a little too loose. Depending on other factors you might be fighting oil pressure issues, that last thing you want is for the oil pump to not make enough flow at high rpm and have that loose bearing grap. This is just my personal opinion, This is given you ARE using correct measuring equipment.

-Roni
Offline
 
Reply With Quote
Old Nov 24, 2016, 11:48 AM   #3
Evolved Member
 
4b11slayer's Avatar
 
Join Date: Nov 2015
Location: Santa Ana
Posts: 1,520
Thanked 69 Times in 69 Posts

Drives: 2004 rs ct9a

I would agree, out of spec and crank bearings do not go together.

If it was an old school chevy or daily driver stock civic. It would be ok no boost no high load.

Now on a evo i wouldnt risk it. Everytime you do a pull its gonna be in the back of your head.
Offline
 
Reply With Quote
Old Nov 24, 2016, 12:44 PM   #4
Evolved Member
iTrader: (1)
 
letsgetthisdone's Avatar
 
Join Date: Oct 2013
Location: Las Vegas
Posts: 9,133
Thanked 341 Times in 324 Posts

Drives: 2005 Evo 8. 2011 F150 FX4

You need a new crank, or you need to cut it .010 and get oversize bearings. Rod bearings should be in the 2-2.5 thou range.

You COULD resize the rods, but I would not recommend that.
Offline
 
Reply With Quote
Old Nov 24, 2016, 05:50 PM   #5
Evolved Member
iTrader: (11)
 
Join Date: Jul 2006
Location: Denton, Tx
Posts: 2,098
Thanked 2 Times in 2 Posts

Drives: Blue 2004 Evo,

^^^this ....what did the machine shop tell you? How much did they take off and what are the clearances? Sounds like you polished out the scuff marks and are trying to fit bearings---that's not going to work.
Offline
 
Reply With Quote
Old Nov 24, 2016, 07:11 PM   #6
Evolving Member
 
Join Date: Mar 2013
Location: in a garage
Posts: 497
Thanked 12 Times in 12 Posts

Drives: Lancer

The journal will be out of round....they always are.
Needs a grind and undersize bearings.
Offline
 
Reply With Quote
Old Nov 24, 2016, 08:02 PM   #7
Evolving Member
Thread Starter
 
Join Date: Aug 2011
Location: somewhere
Posts: 477
Thanks: 0
Thanked 0 Times in 0 Posts

Drives: evo 8 gsr

Quote:
Originally Posted by roni4g63 View Post
He bud, I just finished my build, so I know the feeling! Truth is you will get many answers. Even though it will be in the same ballpark of clearences, you need to determine that cars use and ultimately your ideal clearence.

few questions for ya, are you using an outside micrometer for the journals and a dial bore gauge for the rods with bearings installed? Or are you doing the plastigauge old school way?

On my setup, I ended up with 0.0022-0.0024" on my mains, and 0.0026" on all my rods, i used king xp series bearings and hd a brand new billet uncut crank. All my main journals measured out to 2.2437" and my rod journals about 1.7731" or so (off top of my head)

anyway I would personally say 0.003" is a little too loose. Depending on other factors you might be fighting oil pressure issues, that last thing you want is for the oil pump to not make enough flow at high rpm and have that loose bearing grap. This is just my personal opinion, This is given you ARE using correct measuring equipment.

-Roni
thanks for the response pal! i used the plastigauge to check it, i dont have a micrometer.

i read other forums aswell and they also say .003 is loose, so now my other option is to cut the crank and get oversize bearings.

there's no point in running this loose of a gap only to have oil pressure issues or spiining a bearing again.

thanks again!
Offline
 
Reply With Quote
Old Nov 24, 2016, 08:03 PM   #8
Evolving Member
Thread Starter
 
Join Date: Aug 2011
Location: somewhere
Posts: 477
Thanks: 0
Thanked 0 Times in 0 Posts

Drives: evo 8 gsr

Quote:
Originally Posted by letsgetthisdone View Post
You need a new crank, or you need to cut it .010 and get oversize bearings. Rod bearings should be in the 2-2.5 thou range.

You COULD resize the rods, but I would not recommend that.
thanks! i'll cut the crank and get oversize bearings
Offline
 
Reply With Quote
Old Nov 24, 2016, 08:41 PM   #9
Evolving Member
iTrader: (1)
 
roni4g63's Avatar
 
Join Date: Jul 2015
Location: Sun Valley,CA
Posts: 343
Thanks: 0
Thanked 10 Times in 10 Posts

Drives: '03 Apexi Silver Evo VIII

Plastigauge is very inacurate, you may have 0.002" actual clearence or 0.004" no one knows until you mic it, either get the proper equipment and cry a little (like i did) or buy a new crank for peace of mind, regardless any builder will recommend you buy the proper tools. Hope that helps ya brother
Offline
 
Reply With Quote
Old Sep 14, 2017, 08:31 AM   #10
Newbie
 
Join Date: Dec 2011
Location: Malaysia
Posts: 38
Thanks: 0
Thanked 1 Time in 1 Post

Drives: Evolution 8 GSR JDM

Bearing rods

Hi...im now in the middle of building 2.0LR spec...piston wiseco CR 9:1..rods 156 manley..kings bearing ...evo 8 crank..turbine gt35 ..my concern is on the bearing clearence for main and rods..finally what is the best for it ?..thinking of revving 9krpm with liqui moly 10w60 oil engine...and i will fit in the new oil pump..and coworth oil scrapper in oil pan...my worry is on bearing durability..need advise..
Offline
 
Reply With Quote
Old Sep 14, 2017, 11:29 PM   #11
Newbie
iTrader: (1)
 
tauro91's Avatar
 
Join Date: Aug 2016
Location: Florida
Posts: 70
Thanked 7 Times in 7 Posts

Drives: 06 IX

For high revving ud want to focus on the rods and rod bolts, I would do pro h rods with Carr bolts, will also be better on the bearings, your choice of crank is perfect stay stock.
Idk what your intentions are but I'm guessing a highway monster but not strip/drag because non aluminum rods, and CR?
I'd go with 10.5:1 w/ upgraded wrist pins and of course E85, I would also stay SLR. Just my opinion.
If your far into build upgrade your rod bolts 625+
​Good on scrapper but also focus on a mod that will keep your strainer in oil at high hp pulls, your rotating assembly will thank you.
Offline
 
Reply With Quote
Old Sep 15, 2017, 05:28 AM   #12
Newbie
 
Join Date: Dec 2011
Location: Malaysia
Posts: 38
Thanks: 0
Thanked 1 Time in 1 Post

Drives: Evolution 8 GSR JDM

Quote:
Originally Posted by tauro91 View Post
For high revving ud want to focus on the rods and rod bolts, I would do pro h rods with Carr bolts, will also be better on the bearings, your choice of crank is perfect stay stock.
Idk what your intentions are but I'm guessing a highway monster but not strip/drag because non aluminum rods, and CR?
I'd go with 10.5:1 w/ upgraded wrist pins and of course E85, I would also stay SLR. Just my opinion.
If your far into build upgrade your rod bolts 625+
​Good on scrapper but also focus on a mod that will keep your strainer in oil at high hp pulls, your rotating assembly will thank you.
thanks mate.
Noted with that...my aim is highway monster haha..
for piston...ive brought the wiseco LR set cr 9:1 which i can't change anymore...
only that now thinking, what is the best main crank and conrod bearing clearence for this spec to rev 9krpm ?..mind to advise me...tq
Offline
 
Reply With Quote
Old Sep 15, 2017, 11:14 AM   #13
Evolved Member
iTrader: (1)
 
letsgetthisdone's Avatar
 
Join Date: Oct 2013
Location: Las Vegas
Posts: 9,133
Thanked 341 Times in 324 Posts

Drives: 2005 Evo 8. 2011 F150 FX4

Bearing clearance and PTW are determined by the power you expect to make. The kind of use the engine will see also has a factor in the PTW.
Offline
 
Reply With Quote
Old Sep 16, 2017, 04:43 AM   #14
Newbie
 
Join Date: Dec 2011
Location: Malaysia
Posts: 38
Thanks: 0
Thanked 1 Time in 1 Post

Drives: Evolution 8 GSR JDM

Main and rod bearing clearence

Quote:
Originally Posted by letsgetthisdone View Post
Bearing clearance and PTW are determined by the power you expect to make. The kind of use the engine will see also has a factor in the PTW.
any chance to those that has achieved the setup to share the spec ..especially on your bearing clearence?..
tq in advance.
Offline
 
Reply With Quote
Old Oct 8, 2017, 05:33 AM   #15
Newbie
 
blitzkreig's Avatar
 
Join Date: Aug 2004
Posts: 51
Thanked 0 Times in 0 Posts
I recently purchased a set of Manley Turbo Tuff Rods and inside the the box they had a sticker attached recommending ACL or Clevite bearings.

What do you guys think?
Offline
 
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
King Vs Acl bearings, give us your experience roni4g63 Evo Engine / Turbo / Drivetrain 9 Oct 28, 2016 01:43 AM
Manely I beam TT rod side clearence roni4g63 Evo Engine / Turbo / Drivetrain 12 Sep 25, 2016 07:42 PM
Dial bore gauge? roni4g63 Evo Engine / Turbo / Drivetrain 1 Sep 15, 2016 11:55 AM
Rod bearing question. Using half/half bearings. 2006GSR Evo Engine / Turbo / Drivetrain 2 Mar 11, 2016 08:54 AM
Main/rod clearance question for build and other tid bits dkutej Evo Engine / Turbo / Drivetrain 5 Dec 5, 2015 07:55 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -7. The time now is 01:53 PM.


 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: