Rattling noise when engine goes over 3.5k rpm - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

laziazn · 03-11-2008, 09:17 AM

Can u guys help me out with this problem? my engine finally came out of the shop and it was running smoothly. brian crower cams, new headgaskets, etc. the problem is that when i drive it i hear some rattling noise when im around 3.5k.. i havent even touched redline and i hear a little bit of rattling. is it normal? cuz i have a megan downpipe, test pipe, and a STOCK exhaust with a tip haha... (changing to Hi Power or Apex N1 dual) CAN SOMEONE please help.. Thanks

DRIFTING_SIL_EIGHTY · 03-11-2008, 09:30 AM

help us help you by pinpointing what area its coming from. shoot i could tell you to check your muffler bearings or your blinker fluid. be a bit more descriptive where the noise is.

shade · 03-11-2008, 11:14 AM

Motor balanced or no? New unbalanced driveshaft? Any rotating mass not balanced?

JRas · 03-11-2008, 03:34 PM

you should be able to give us an idea of where it's coming from

example: trunk, passenger door, underneath your seat, engine bay, and such

DarkPhoenix · 03-11-2008, 08:17 PM

And if the problem is only happening under load, or when you are free revving.

laziazn · 03-12-2008, 11:41 AM

im sorry that i wasnt too descriptive. so here it goes. the rattling comes from the passenger side(right side) around the engine bay and underneath the car, and it also rattles when i just have it idling. It becomes even louder when i go over 3.5k. is it because i have a test pipe with a downpipe running into a stock exhaust?

lilredstiffy · 03-12-2008, 06:13 PM

loose flywheel/clutch assembly, rod knock, or timing chain components would be my guess

longhorntx09 · 04-24-2008, 09:08 PM

bad timing chain tensioner ?

Mi Beardo es Loco · 04-24-2008, 09:11 PM

flywheel imo

2ilvia · 04-25-2008, 12:30 AM

definitely has to be the wobbler shaft, its over-balanced

k serious time, rattling sounds like the timing chain, mine had a rattle and it was an exhaust shield, i dont think its got anything to do with the exhaust

travypoo · 04-25-2008, 02:48 PM

my sr made a loud rattle noise over 3500 rpms last season, turned out the turbo elbow was half cracked and was twanging

Zenki_S14 · 04-26-2008, 12:05 AM

You said your car was brought into a shop. What was done to it?

sileightyfreak · 04-26-2008, 11:28 AM

hmmm... it might jus be normal. u mentioned that u had upgraded cams, right? my buddy eric was working on a supra for timing, and the motor seemed like it was rod knocking

. in the end, it was the cams that made the sounds. thats wat im guessing

aNskY · 05-04-2008, 06:54 PM

solid motor mounts will create a resonance around 3500rpm.....

03-11-2008, 09:17 AM	#1
laziazn Join Date: Sep 2007 Location: COVINA Posts: 41 Trader Rating: (0) Feedback Score: 0 reviews	Rattling noise when engine goes over 3.5k rpm Can u guys help me out with this problem? my engine finally came out of the shop and it was running smoothly. brian crower cams, new headgaskets, etc. the problem is that when i drive it i hear some rattling noise when im around 3.5k.. i havent even touched redline and i hear a little bit of rattling. is it normal? cuz i have a megan downpipe, test pipe, and a STOCK exhaust with a tip haha... (changing to Hi Power or Apex N1 dual) CAN SOMEONE please help.. Thanks

03-11-2008, 03:34 PM	#4
JRas Zilvia FREAK! Join Date: Jul 2007 Location: Arizona Age: 32 Posts: 1,503 Trader Rating: (2) Feedback Score: 2 reviews	you should be able to give us an idea of where it's coming from example: trunk, passenger door, underneath your seat, engine bay, and such __________________

03-11-2008, 08:17 PM	#5
DarkPhoenix Zilvia Member Join Date: Feb 2008 Location: South Huntington, NY Age: 44 Posts: 247 Trader Rating: (0) Feedback Score: 0 reviews	And if the problem is only happening under load, or when you are free revving. __________________ 1990 Nissan 240SX SE FB-KA24ET in progress! Lotsa people with sandy holes on the interwebs!!

03-12-2008, 06:13 PM	#7
lilredstiffy Zilvia Addict Join Date: Nov 2001 Location: louisiana Posts: 618 Trader Rating: (0) Feedback Score: 0 reviews	loose flywheel/clutch assembly, rod knock, or timing chain components would be my guess __________________ KEEP CHARLIE MERCER BANNED HES A GOOD FOR NOTHING RACIST KEEP CHARLIE MERCER BANNED HES A GOOD FOR NOTHING RACIST KEEP CHARLIE MERCER BANNED HES A GOOD FOR NOTHING RACIST KEEP CHARLIE MERCER BANNED HES A GOOD FOR NOTHING RACIST KEEP CHARLIE MERCER BANNED HES A GOOD FOR NOTHING RACIST KEEP CHARLIE MERCER BANNED HES A GOOD FOR NOTHING RACIST KEEP CHARLIE MERCER BANNED HES A GOOD FOR NOTHING RACIST

04-25-2008, 12:30 AM	#10
2ilvia Zilvia Addict Join Date: Sep 2006 Location: norhio Posts: 627 Trader Rating: (4) Feedback Score: 4 reviews	definitely has to be the wobbler shaft, its over-balanced k serious time, rattling sounds like the timing chain, mine had a rattle and it was an exhaust shield, i dont think its got anything to do with the exhaust __________________ S14- soon to be powered by 24v cummins- 450lbs tq

03-11-2008, 09:30 AM	#2
DRIFTING_SIL_EIGHTY Zilvia Addict Join Date: Nov 2002 Location: gardena/los angeles Posts: 752 Trader Rating: (14) Feedback Score: 14 reviews	help us help you by pinpointing what area its coming from. shoot i could tell you to check your muffler bearings or your blinker fluid. be a bit more descriptive where the noise is.

03-11-2008, 11:14 AM	#3
shade Zilvia Junkie Join Date: Mar 2008 Location: San Diego Age: 32 Posts: 509 Trader Rating: (0) Feedback Score: 0 reviews	Motor balanced or no? New unbalanced driveshaft? Any rotating mass not balanced?

03-12-2008, 11:41 AM	#6
laziazn Join Date: Sep 2007 Location: COVINA Posts: 41 Trader Rating: (0) Feedback Score: 0 reviews	im sorry that i wasnt too descriptive. so here it goes. the rattling comes from the passenger side(right side) around the engine bay and underneath the car, and it also rattles when i just have it idling. It becomes even louder when i go over 3.5k. is it because i have a test pipe with a downpipe running into a stock exhaust?

04-24-2008, 09:08 PM	#8
longhorntx09 Leaky Injector Join Date: Aug 2007 Location: texas Age: 35 Posts: 55 Trader Rating: (0) Feedback Score: 0 reviews	bad timing chain tensioner ?

04-25-2008, 02:48 PM	#11
travypoo Zilvia Member Join Date: Jan 2006 Location: Edmonton Alberta Posts: 196 Trader Rating: (0) Feedback Score: 0 reviews	my sr made a loud rattle noise over 3500 rpms last season, turned out the turbo elbow was half cracked and was twanging

04-26-2008, 12:05 AM	#12
Zenki_S14 Zilvia Junkie Join Date: Oct 2002 Location: San Diego, CA Posts: 323 Trader Rating: (0) Feedback Score: 0 reviews	You said your car was brought into a shop. What was done to it?

04-26-2008, 11:28 AM	#13
sileightyfreak Zilvia FREAK! Join Date: Nov 2007 Location: LBC Age: 34 Posts: 1,385 Trader Rating: (10) Feedback Score: 10 reviews	hmmm... it might jus be normal. u mentioned that u had upgraded cams, right? my buddy eric was working on a supra for timing, and the motor seemed like it was rod knocking . in the end, it was the cams that made the sounds. thats wat im guessing __________________

05-04-2008, 06:54 PM	#14
aNskY Nissanaholic! Join Date: Apr 2005 Location: NY Age: 37 Posts: 1,604 Trader Rating: (10) Feedback Score: 10 reviews	solid motor mounts will create a resonance around 3500rpm.....

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