built sr20det making a knocking noise at 2-3k rpms. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

imnotniko · 04-28-2010, 10:02 PM

whatsup everyone. i got my sr20det built less then 2k miles ago. i drove it easy for the first 500 miles. (i mean easy as in not shifting over 3,000 rpms and not seeing any boost) then changed the oil and drove it easy for at least another 400 miles then started boosting it little by little. the cars seen few full throttle pulls (its not tuned yet) and has been driven good in my opinion.

i always heard a noise around 3,000 rpms and didn't think much of it.. it kinda sounded like a loose screw vibrating on my valve cover. today i was a block away from home and at 3,000 rpms the noise was louder and didn't sound to good. i don't know what it is and havent driven my car. i took a video quick of how it sounds but it was dark so theres no light (you only need ears to hear it anyways)

anyone have any ideas what it can be? i know it can range from something like the timing chain all teh way to a rod knock =x

YouTube - test

*fliprayzin240sx* · 04-28-2010, 11:58 PM

Hmm...thats weird, have you tried revving it pass where you actually hear the knock? Usually, for rod knocks, you hear it distinct at a certain RPM and then kinda goes away when you go higher that the "sweet spot".

imnotniko · 04-29-2010, 12:05 AM

Quote:

Originally Posted by fliprayzin240sx

Hmm...thats weird, have you tried revving it pass where you actually hear the knock? Usually, for rod knocks, you hear it distinct at a certain RPM and then kinda goes away when you go higher that the "sweet spot".

i'm pretty sure it's still there.. i have another video in car where i rev'd up to like 5k and it was there.. i'll upload that.

imnotniko · 04-29-2010, 12:06 AM

YouTube - test2

heres a video of it in car.

imnotniko · 04-29-2010, 12:13 AM

or do you think that little noise that i always heard around 3,000 rpms could of been a rod knock and now its on its gotten worse to the point now where its actually doing damage?

*fliprayzin240sx* · 04-29-2010, 12:37 AM

What was done to the engine exactly and what mods do you have on it? Also, do you have an oil pressure gauge and was the oil pump changed during the rebuild?

imnotniko · 04-29-2010, 11:22 AM

Quote:

Originally Posted by fliprayzin240sx

What was done to the engine exactly and what mods do you have on it? Also, do you have an oil pressure gauge and was the oil pump changed during the rebuild?

yeah i have an oil pressure gauge. the car had a full build.. motor was sent to machine shop and it got pistons rods bearings valves springs retainers rocker arms cams rocker arm stoppers.

its running a gt2871r at 14lbs right now. i went to get the car tuned like 600 miles after break in. on the dyno it was breaking up at 5500rpms in 3rd gear so we couldn't finish tuning it. we changed the plugs and it was good. the car was supposed to be tuned next monday =/

imnotniko · 04-29-2010, 11:24 AM

good thing i have triple A. they're gonna tow the car to the shop for me within the next hour or two.

S14mc · 04-30-2010, 05:21 PM

It could possibly be a stuck lifter.

*fliprayzin240sx* · 04-30-2010, 10:01 PM

Actually, it sounds more like the chain is tapping something...do you still have the chain cover plate on top of the head? Chain could be slapping on that if its still there....

imnotniko · 04-30-2010, 10:58 PM

i dropeed the car off at the shop yesterday. they're busy getting a car together for the track this weekend. hopefully monday they'll be able to look at it.

*fliprayzin240sx* · 05-01-2010, 02:20 AM

Let us know, like I said...it sounds more like chain tapping sound than rod knocking...

Options13 · 07-12-2010, 11:29 PM

what was the problem? i have the exact same problem

s13coupe1988 · 07-12-2010, 11:48 PM

i had the same problem/noise and it was a rod knock between 2-3 rpm best thing you can do is drain your oil and check for brass metal shavings good luck

Options13 · 07-13-2010, 12:13 AM

so if it knocks around 2-3k its most likely a rod knock? fuck..

kushlivin · 07-13-2010, 12:15 AM

U gots yourself a rodknock son

s13coupe1988 · 07-13-2010, 12:29 AM

Drain your oil and check to see if there is any brass shavings, also what kind of oil are you running and what motor do you have?

Quote:

Originally Posted by options13

so if it knocks around 2-3k its most likely a rod knock? Fuck..

LimeLite Racing · 07-13-2010, 12:40 AM

Sounds like timing chain tensioner and/or guides. Doesn't sound like rod knock to me.

Options13 · 07-13-2010, 12:54 AM

i run 15w-40 amsoil diesel oil

and i have an sr20det, i drained my oil today, i didn't see any metal shavings.

PS! got it it was the timing chain tensioner!

04-28-2010, 10:02 PM	#1
imnotniko Zilvia Junkie Join Date: Jul 2008 Location: longisland Age: 33 Posts: 337 Trader Rating: (9) Feedback Score: 9 reviews	built sr20det making a knocking noise at 2-3k rpms. whatsup everyone. i got my sr20det built less then 2k miles ago. i drove it easy for the first 500 miles. (i mean easy as in not shifting over 3,000 rpms and not seeing any boost) then changed the oil and drove it easy for at least another 400 miles then started boosting it little by little. the cars seen few full throttle pulls (its not tuned yet) and has been driven good in my opinion. i always heard a noise around 3,000 rpms and didn't think much of it.. it kinda sounded like a loose screw vibrating on my valve cover. today i was a block away from home and at 3,000 rpms the noise was louder and didn't sound to good. i don't know what it is and havent driven my car. i took a video quick of how it sounds but it was dark so theres no light (you only need ears to hear it anyways) anyone have any ideas what it can be? i know it can range from something like the timing chain all teh way to a rod knock =x YouTube - test

04-28-2010, 11:58 PM	#2
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Hmm...thats weird, have you tried revving it pass where you actually hear the knock? Usually, for rod knocks, you hear it distinct at a certain RPM and then kinda goes away when you go higher that the "sweet spot". __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

04-29-2010, 12:37 AM	#6
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	What was done to the engine exactly and what mods do you have on it? Also, do you have an oil pressure gauge and was the oil pump changed during the rebuild? __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

04-30-2010, 10:01 PM	#10
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Actually, it sounds more like the chain is tapping something...do you still have the chain cover plate on top of the head? Chain could be slapping on that if its still there.... __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

05-01-2010, 02:20 AM	#12
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Let us know, like I said...it sounds more like chain tapping sound than rod knocking... __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

04-29-2010, 12:06 AM	#4
imnotniko Zilvia Junkie Join Date: Jul 2008 Location: longisland Age: 33 Posts: 337 Trader Rating: (9) Feedback Score: 9 reviews	YouTube - test2 heres a video of it in car.

04-29-2010, 12:13 AM	#5
imnotniko Zilvia Junkie Join Date: Jul 2008 Location: longisland Age: 33 Posts: 337 Trader Rating: (9) Feedback Score: 9 reviews	or do you think that little noise that i always heard around 3,000 rpms could of been a rod knock and now its on its gotten worse to the point now where its actually doing damage?

04-29-2010, 11:24 AM	#8
imnotniko Zilvia Junkie Join Date: Jul 2008 Location: longisland Age: 33 Posts: 337 Trader Rating: (9) Feedback Score: 9 reviews	good thing i have triple A. they're gonna tow the car to the shop for me within the next hour or two.

04-30-2010, 05:21 PM	#9
S14mc Leaky Injector Join Date: Dec 2002 Posts: 136 Trader Rating: (0) Feedback Score: 0 reviews	It could possibly be a stuck lifter.

04-30-2010, 10:58 PM	#11
imnotniko Zilvia Junkie Join Date: Jul 2008 Location: longisland Age: 33 Posts: 337 Trader Rating: (9) Feedback Score: 9 reviews	i dropeed the car off at the shop yesterday. they're busy getting a car together for the track this weekend. hopefully monday they'll be able to look at it.

07-12-2010, 11:29 PM	#13
Options13 Nissanaholic! Join Date: May 2007 Location: OR Posts: 1,825 Trader Rating: (43) Feedback Score: 43 reviews	what was the problem? i have the exact same problem

07-12-2010, 11:48 PM	#14
s13coupe1988 Zilvia Member Join Date: Jun 2010 Location: CALIFORNIA 310 Age: 36 Posts: 170 Trader Rating: (2) Feedback Score: 2 reviews	i had the same problem/noise and it was a rod knock between 2-3 rpm best thing you can do is drain your oil and check for brass metal shavings good luck

07-13-2010, 12:13 AM	#15
Options13 Nissanaholic! Join Date: May 2007 Location: OR Posts: 1,825 Trader Rating: (43) Feedback Score: 43 reviews	so if it knocks around 2-3k its most likely a rod knock? fuck..

07-13-2010, 12:40 AM	#18
LimeLite Racing Post Whore! Join Date: May 2007 Location: Eugene! Posts: 3,197 Trader Rating: (24) Rides Gallery: LimeLite Racing Feedback Score: 24 reviews	Sounds like timing chain tensioner and/or guides. Doesn't sound like rod knock to me. __________________ Drift.

07-13-2010, 12:54 AM	#19
Options13 Nissanaholic! Join Date: May 2007 Location: OR Posts: 1,825 Trader Rating: (43) Feedback Score: 43 reviews	i run 15w-40 amsoil diesel oil and i have an sr20det, i drained my oil today, i didn't see any metal shavings. PS! got it it was the timing chain tensioner! Last edited by Options13; 07-15-2010 at 03:19 PM..

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