Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Go Back   Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum > General > Chat

Chat General Discussion About The Nissan 240SX and Nissan Z Cars


Reply
 
Thread Tools Display Modes
Old 10-30-2018, 05:00 PM   #1
Hoffman5982
Nissanaholic!
 
Hoffman5982's Avatar
 
Join Date: Jan 2009
Location: Definitely NOT FL....
Age: 29
Posts: 2,491
Trader Rating: (25)
Hoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really nice
Feedback Score: 25 reviews
RB25 Flywheel on KA24DE-Improperly balanced?

So I recently blew my ka up, again. The same day it went I was told the rb25 flywheel isn't balanced correctly for a ka and will cause it to destroy bearings. This is the first I've heard of this and it has me a little paranoid. My ka didn't go in a normal manner. Rod bearing number 3 was absolutely destroyed but didn't spin and no visible damage was done to the crank. All tolerances were spot on when it was assembled. I'm throwing my turbo setup on another long block so I want to figure out if I need to get rid of this setup or not.

Thanks!
__________________
Hoffman5982 is offline   Reply With Quote
Sponsored Links
Old 10-30-2018, 05:42 PM   #2
EnnEssEnnKAT
Zilvia Junkie
 
EnnEssEnnKAT's Avatar
 
Join Date: Sep 2014
Location: New Hampshire
Posts: 427
Trader Rating: (13)
EnnEssEnnKAT can only hope to improve
Feedback Score: 13 reviews
Not sure if it helps or not but I also run the same flywheel on my ka and have for 10k miles and never heard of such a thing. Matched with an ATC clutch, no problems here.

Sent from mTalk
EnnEssEnnKAT is offline   Reply With Quote
Old 10-30-2018, 09:37 PM   #3
Hoffman5982
Nissanaholic!
 
Hoffman5982's Avatar
 
Join Date: Jan 2009
Location: Definitely NOT FL....
Age: 29
Posts: 2,491
Trader Rating: (25)
Hoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really nice
Feedback Score: 25 reviews
Quote:
Originally Posted by EnnEssEnnKAT View Post
Not sure if it helps or not but I also run the same flywheel on my ka and have for 10k miles and never heard of such a thing. Matched with an ATC clutch, no problems here.

Sent from mTalk
At the rate I've been going, 10k miles is like 10 years of running for me. I'm good with that!
__________________
Hoffman5982 is offline   Reply With Quote
Old 10-30-2018, 10:28 PM   #4
ANDY black s13
Zilvia Member
 
Join Date: Mar 2012
Location: erith kent england
Age: 53
Posts: 153
Trader Rating: (0)
ANDY black s13 is an unknown quantity at this point
Feedback Score: 0 reviews
if a shop told you the flywheel of death story,don't let them near your engine
ANDY black s13 is offline   Reply With Quote
Old 10-31-2018, 10:44 AM   #5
Hoffman5982
Nissanaholic!
 
Hoffman5982's Avatar
 
Join Date: Jan 2009
Location: Definitely NOT FL....
Age: 29
Posts: 2,491
Trader Rating: (25)
Hoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really nice
Feedback Score: 25 reviews
Quote:
Originally Posted by ANDY black s13 View Post
if a shop told you the flywheel of death story,don't let them near your engine
It wasn't a shop, it was just a guy at the event I was attending who said it's what killed his ka.
__________________
Hoffman5982 is offline   Reply With Quote
Old 10-31-2018, 11:16 AM   #6
ANDY black s13
Zilvia Member
 
Join Date: Mar 2012
Location: erith kent england
Age: 53
Posts: 153
Trader Rating: (0)
ANDY black s13 is an unknown quantity at this point
Feedback Score: 0 reviews
imo if it was an imblance issue it would affect no1 and no5 main bearings
as it would pivot ever so slightly round the center main & thrusts
it wouldn't affect one big end bearing only,that is another issue
possibly starved oil feed,con rod out of round (distorted cap?),
bearing layers lifted etc

three bearing mains 4 cyl engines suffer crank flex and take out the center main
the center main will fail first or the crank snaps in two before the BE bearings fail
ANDY black s13 is offline   Reply With Quote
Old 10-31-2018, 11:19 AM   #7
PoorMans180SX
Zilvia.net Advertiser
 
PoorMans180SX's Avatar
 
Join Date: Nov 2005
Location: Michigan
Age: 33
Posts: 5,431
Trader Rating: (16)
PoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfection
Feedback Score: 16 reviews
Send a message via AIM to PoorMans180SX
Out of curiosity, what were your main bearing clearances? When did it start knocking and what do you use the car for? Do you have a well-baffled oil pan?

A flywheel has very little to do with crank balance, which is part of the reason why there are so many weight options available.
__________________
Build: http://zilvia.net/f/showthread.php?t=643065

Friends don't let friends buy knock-offs.
PoorMans180SX is offline   Reply With Quote
Old 10-31-2018, 03:28 PM   #8
mewantkouki
Zilvia FREAK!
 
Join Date: Nov 2007
Location: Orlando, Fl
Age: 35
Posts: 1,221
Trader Rating: (36)
mewantkouki is making a name for him/her selfmewantkouki is making a name for him/her selfmewantkouki is making a name for him/her self
Feedback Score: 36 reviews
Flywheel of death is BS. I've put 35k on a white bunny setup collectively on three different cars. I vote oil starvation or pre-ignition...
mewantkouki is offline   Reply With Quote
Old 10-31-2018, 10:10 PM   #9
Hoffman5982
Nissanaholic!
 
Hoffman5982's Avatar
 
Join Date: Jan 2009
Location: Definitely NOT FL....
Age: 29
Posts: 2,491
Trader Rating: (25)
Hoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really nice
Feedback Score: 25 reviews
Quote:
Originally Posted by PoorMans180SX View Post
Out of curiosity, what were your main bearing clearances? When did it start knocking and what do you use the car for? Do you have a well-baffled oil pan?

A flywheel has very little to do with crank balance, which is part of the reason why there are so many weight options available.
I'd have to find where I wrote down all the bearing clearances and rings gaps etc. But it was right in the middle of the oem allownaces. The car is used for drifting. It was a full rebuild with ross pistons and eagle rods. Oil pan is stock, I just rebuilt the oil pump. In all honesty I got the rods and pistons second hand. The bottom end they came out of was a "perfectly running" motor that had a 4 piece piston and 2 mismatched rod caps when I pulled it apart. I ordered 2 new parts. What I think happened is the rotating assembly was out of balance. I emailed Eagle directly about replacement rods and they never said anything about needing to send the set in to match them all up. I found out once the motor was back in the car. My fault for not doing any research.

Quote:
Originally Posted by mewantkouki View Post
Flywheel of death is BS. I've put 35k on a white bunny setup collectively on three different cars. I vote oil starvation or pre-ignition...
I figured. I don't think it was oil starvation because I did about 8 more laps of steady redline after the sound started and there isn't a single mark on that journal of the crank. I haven't taken the head off to see if there was detonation, although the car ran perfectly fine and I never heard any pinging.
__________________
Hoffman5982 is offline   Reply With Quote
Old 10-31-2018, 10:10 PM   #10
Hoffman5982
Nissanaholic!
 
Hoffman5982's Avatar
 
Join Date: Jan 2009
Location: Definitely NOT FL....
Age: 29
Posts: 2,491
Trader Rating: (25)
Hoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really nice
Feedback Score: 25 reviews
I really didn't think there was any truth to this. I just wanted to be 100% sure because if so I could have sold my current setup. This saves me time and money. Thanks everyone!
__________________
Hoffman5982 is offline   Reply With Quote
Old 11-01-2018, 05:38 AM   #11
EnnEssEnnKAT
Zilvia Junkie
 
EnnEssEnnKAT's Avatar
 
Join Date: Sep 2014
Location: New Hampshire
Posts: 427
Trader Rating: (13)
EnnEssEnnKAT can only hope to improve
Feedback Score: 13 reviews
What clutch are you running on there btw

Sent from mTalk
EnnEssEnnKAT is offline   Reply With Quote
Old 11-01-2018, 08:11 AM   #12
PoorMans180SX
Zilvia.net Advertiser
 
PoorMans180SX's Avatar
 
Join Date: Nov 2005
Location: Michigan
Age: 33
Posts: 5,431
Trader Rating: (16)
PoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfection
Feedback Score: 16 reviews
Send a message via AIM to PoorMans180SX
Quote:
Originally Posted by Hoffman5982 View Post
I'd have to find where I wrote down all the bearing clearances and rings gaps etc. But it was right in the middle of the oem allownaces. The car is used for drifting. It was a full rebuild with ross pistons and eagle rods. Oil pan is stock, I just rebuilt the oil pump. In all honesty I got the rods and pistons second hand. The bottom end they came out of was a "perfectly running" motor that had a 4 piece piston and 2 mismatched rod caps when I pulled it apart. I ordered 2 new parts. What I think happened is the rotating assembly was out of balance. I emailed Eagle directly about replacement rods and they never said anything about needing to send the set in to match them all up. I found out once the motor was back in the car. My fault for not doing any research.
Factory tolerance for rod bearings is too tight for an engine that sees abuse. I'd open up the rods to .002" and run a solid 5w40 or 5w50 if I were you. This is the #1 reason that most Nissan engines eat rod bearings at the track.

Also double check the big end dimensions of those eagles, they're notorious for being inconsistent/out of round and needing a resize.
__________________
Build: http://zilvia.net/f/showthread.php?t=643065

Friends don't let friends buy knock-offs.
PoorMans180SX is offline   Reply With Quote
Old 11-01-2018, 03:36 PM   #13
Hoffman5982
Nissanaholic!
 
Hoffman5982's Avatar
 
Join Date: Jan 2009
Location: Definitely NOT FL....
Age: 29
Posts: 2,491
Trader Rating: (25)
Hoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really nice
Feedback Score: 25 reviews
Quote:
Originally Posted by PoorMans180SX View Post
Factory tolerance for rod bearings is too tight for an engine that sees abuse. I'd open up the rods to .002" and run a solid 5w40 or 5w50 if I were you. This is the #1 reason that most Nissan engines eat rod bearings at the track.

Also double check the big end dimensions of those eagles, they're notorious for being inconsistent/out of round and needing a resize.
That's good to know. I was running 15w-50 Mobil 1, might switch back to 15w-40 Rotella that I've run for the past 5 years. I've switched back to a new/used long block(compression is good and timing kit/oil pump are getting replaced). My tune was done on a stock motor, I just had a garbage cooling system at the time and ended up driving an event on a blow headgasket and when the motor hit 380F it took the rings with it. This old motor is going to sit for a while and when the time comes I will be taking the entire rotating assembly to a machinist to have them completely go over it. I'll definitely open those tolerances up as well.

For reference, I'm only running ~11psi on a 2871 which yielded 290whp and I lowered the rev limiter down to 6850
__________________
Hoffman5982 is offline   Reply With Quote
Old 11-01-2018, 03:37 PM   #14
Hoffman5982
Nissanaholic!
 
Hoffman5982's Avatar
 
Join Date: Jan 2009
Location: Definitely NOT FL....
Age: 29
Posts: 2,491
Trader Rating: (25)
Hoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really niceHoffman5982 is just really nice
Feedback Score: 25 reviews
Quote:
Originally Posted by EnnEssEnnKAT View Post
What clutch are you running on there btw

Sent from mTalk
I'm running an RB25 XTD 14lb flywheel(I know, but my ka xtd lasted 4 years of abuse with zero issue) and an RB25 Competition stage 3 clutch set
__________________
Hoffman5982 is offline   Reply With Quote
Old 11-02-2018, 04:31 PM   #15
Kingtal0n
Post Whore!
 
Kingtal0n's Avatar
 
Join Date: Jul 2005
Location: South Florida
Age: 38
Posts: 4,649
Trader Rating: (17)
Kingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond repute
Feedback Score: 17 reviews
Send a message via AIM to Kingtal0n
I do not think of a flywheel as a component of natural frequency damping.


It can be out of balance but that should be obvious (vibrations)
If it wasn't damping natural (resonant) frequencies of the engine in question then that is a whole other story (you would not feel that happen, and it will show as 'perfect balance' with respect to mass)

If you modify the inside of the engine and the natural frequencies change, then something needs to be done about new emerging natural frequencies. Typically people throw a fluidamper and go. I presume that you have a fluidamper and are not trying to utilize a stock damper with aftermarket internals. -.-

also what was said about using tight (factory) clearances with heavy weight oils is correct (=failure)
Kingtal0n is offline   Reply With Quote
Old 11-02-2018, 06:19 PM   #16
PoorMans180SX
Zilvia.net Advertiser
 
PoorMans180SX's Avatar
 
Join Date: Nov 2005
Location: Michigan
Age: 33
Posts: 5,431
Trader Rating: (16)
PoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfectionPoorMans180SX is close to perfection
Feedback Score: 16 reviews
Send a message via AIM to PoorMans180SX
Quote:
Originally Posted by Kingtal0n View Post


It can be out of balance but that should be obvious (vibrations)
Funny story. I bought a comp clutch for a KA that I bought with a bad clutch. After I installed it I wondered why the car had a shit top end and hated to rev. Later I learned that the pressure plate was drilled off-center. I’d imagine with solid mounts it would have been much more obvious.
__________________
Build: http://zilvia.net/f/showthread.php?t=643065

Friends don't let friends buy knock-offs.
PoorMans180SX is offline   Reply With Quote
Reply

Bookmarks


Thread Tools
Display Modes

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

Forum Jump


All times are GMT -6. The time now is 05:42 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
vB.Sponsors
Copyright © 1998 - 2019, Zilvia.net™